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 *curl_no_proxy;
  74 static const char *http_proxy_authmethod;
  75 static struct {
  76         const char *name;
  77         long curlauth_param;
  78 } proxy_authmethods[] = {
  79         { "basic", CURLAUTH_BASIC },
  80         { "digest", CURLAUTH_DIGEST },
  81         { "negotiate", CURLAUTH_GSSNEGOTIATE },
  82         { "ntlm", CURLAUTH_NTLM },
  83 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  84         { "anyauth", CURLAUTH_ANY },
  85 #endif
  86         /*
  87          * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  88          * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  89          * here, too
  90          */
  91 };
  92 static struct credential proxy_auth = CREDENTIAL_INIT;
  93 static const char *curl_proxyuserpwd;
  94 static const char *curl_cookie_file;
  95 static int curl_save_cookies;
  96 struct credential http_auth = CREDENTIAL_INIT;
  97 static int http_proactive_auth;
  98 static const char *user_agent;
  99 static int curl_empty_auth;
 100
 101 #if LIBCURL_VERSION_NUM >= 0x071700
 102 /* Use CURLOPT_KEYPASSWD as is */
 103 #elif LIBCURL_VERSION_NUM >= 0x070903
 104 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 105 #else
 106 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 107 #endif
 108
 109 static struct credential cert_auth = CREDENTIAL_INIT;
 110 static int ssl_cert_password_required;
 111 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 112 static unsigned long http_auth_methods = CURLAUTH_ANY;
 113 #endif
 114
 115 static struct curl_slist *pragma_header;
 116 static struct curl_slist *no_pragma_header;
 117
 118 static struct active_request_slot *active_queue_head;
 119
 120 static char *cached_accept_language;
 121
 122 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 123 {
 124         size_t size = eltsize * nmemb;
 125         struct buffer *buffer = buffer_;
 126
 127         if (size > buffer->buf.len - buffer->posn)
 128                 size = buffer->buf.len - buffer->posn;
 129         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 130         buffer->posn += size;
 131
 132         return size;
 133 }
 134
 135 #ifndef NO_CURL_IOCTL
 136 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 137 {
 138         struct buffer *buffer = clientp;
 139
 140         switch (cmd) {
 141         case CURLIOCMD_NOP:
 142                 return CURLIOE_OK;
 143
 144         case CURLIOCMD_RESTARTREAD:
 145                 buffer->posn = 0;
 146                 return CURLIOE_OK;
 147
 148         default:
 149                 return CURLIOE_UNKNOWNCMD;
 150         }
 151 }
 152 #endif
 153
 154 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 155 {
 156         size_t size = eltsize * nmemb;
 157         struct strbuf *buffer = buffer_;
 158
 159         strbuf_add(buffer, ptr, size);
 160         return size;
 161 }
 162
 163 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 164 {
 165         return eltsize * nmemb;
 166 }
 167
 168 static void closedown_active_slot(struct active_request_slot *slot)
 169 {
 170         active_requests--;
 171         slot->in_use = 0;
 172 }
 173
 174 static void finish_active_slot(struct active_request_slot *slot)
 175 {
 176         closedown_active_slot(slot);
 177         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 178
 179         if (slot->finished != NULL)
 180                 (*slot->finished) = 1;
 181
 182         /* Store slot results so they can be read after the slot is reused */
 183         if (slot->results != NULL) {
 184                 slot->results->curl_result = slot->curl_result;
 185                 slot->results->http_code = slot->http_code;
 186 #if LIBCURL_VERSION_NUM >= 0x070a08
 187                 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 188                                   &slot->results->auth_avail);
 189 #else
 190                 slot->results->auth_avail = 0;
 191 #endif
 192
 193                 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 194                         &slot->results->http_connectcode);
 195         }
 196
 197         /* Run callback if appropriate */
 198         if (slot->callback_func != NULL)
 199                 slot->callback_func(slot->callback_data);
 200 }
 201
 202 #ifdef USE_CURL_MULTI
 203 static void process_curl_messages(void)
 204 {
 205         int num_messages;
 206         struct active_request_slot *slot;
 207         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 208
 209         while (curl_message != NULL) {
 210                 if (curl_message->msg == CURLMSG_DONE) {
 211                         int curl_result = curl_message->data.result;
 212                         slot = active_queue_head;
 213                         while (slot != NULL &&
 214                                slot->curl != curl_message->easy_handle)
 215                                 slot = slot->next;
 216                         if (slot != NULL) {
 217                                 curl_multi_remove_handle(curlm, slot->curl);
 218                                 slot->curl_result = curl_result;
 219                                 finish_active_slot(slot);
 220                         } else {
 221                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 222                         }
 223                 } else {
 224                         fprintf(stderr, "Unknown CURL message received: %d\n",
 225                                 (int)curl_message->msg);
 226                 }
 227                 curl_message = curl_multi_info_read(curlm, &num_messages);
 228         }
 229 }
 230 #endif
 231
 232 static int http_options(const char *var, const char *value, void *cb)
 233 {
 234         if (!strcmp("http.sslverify", var)) {
 235                 curl_ssl_verify = git_config_bool(var, value);
 236                 return 0;
 237         }
 238         if (!strcmp("http.sslcipherlist", var))
 239                 return git_config_string(&ssl_cipherlist, var, value);
 240         if (!strcmp("http.sslversion", var))
 241                 return git_config_string(&ssl_version, var, value);
 242         if (!strcmp("http.sslcert", var))
 243                 return git_config_string(&ssl_cert, var, value);
 244 #if LIBCURL_VERSION_NUM >= 0x070903
 245         if (!strcmp("http.sslkey", var))
 246                 return git_config_string(&ssl_key, var, value);
 247 #endif
 248 #if LIBCURL_VERSION_NUM >= 0x070908
 249         if (!strcmp("http.sslcapath", var))
 250                 return git_config_pathname(&ssl_capath, var, value);
 251 #endif
 252         if (!strcmp("http.sslcainfo", var))
 253                 return git_config_pathname(&ssl_cainfo, var, value);
 254         if (!strcmp("http.sslcertpasswordprotected", var)) {
 255                 ssl_cert_password_required = git_config_bool(var, value);
 256                 return 0;
 257         }
 258         if (!strcmp("http.ssltry", var)) {
 259                 curl_ssl_try = git_config_bool(var, value);
 260                 return 0;
 261         }
 262         if (!strcmp("http.minsessions", var)) {
 263                 min_curl_sessions = git_config_int(var, value);
 264 #ifndef USE_CURL_MULTI
 265                 if (min_curl_sessions > 1)
 266                         min_curl_sessions = 1;
 267 #endif
 268                 return 0;
 269         }
 270 #ifdef USE_CURL_MULTI
 271         if (!strcmp("http.maxrequests", var)) {
 272                 max_requests = git_config_int(var, value);
 273                 return 0;
 274         }
 275 #endif
 276         if (!strcmp("http.lowspeedlimit", var)) {
 277                 curl_low_speed_limit = (long)git_config_int(var, value);
 278                 return 0;
 279         }
 280         if (!strcmp("http.lowspeedtime", var)) {
 281                 curl_low_speed_time = (long)git_config_int(var, value);
 282                 return 0;
 283         }
 284
 285         if (!strcmp("http.noepsv", var)) {
 286                 curl_ftp_no_epsv = git_config_bool(var, value);
 287                 return 0;
 288         }
 289         if (!strcmp("http.proxy", var))
 290                 return git_config_string(&curl_http_proxy, var, value);
 291
 292         if (!strcmp("http.proxyauthmethod", var))
 293                 return git_config_string(&http_proxy_authmethod, var, value);
 294
 295         if (!strcmp("http.cookiefile", var))
 296                 return git_config_string(&curl_cookie_file, var, value);
 297         if (!strcmp("http.savecookies", var)) {
 298                 curl_save_cookies = git_config_bool(var, value);
 299                 return 0;
 300         }
 301
 302         if (!strcmp("http.postbuffer", var)) {
 303                 http_post_buffer = git_config_int(var, value);
 304                 if (http_post_buffer < LARGE_PACKET_MAX)
 305                         http_post_buffer = LARGE_PACKET_MAX;
 306                 return 0;
 307         }
 308
 309         if (!strcmp("http.useragent", var))
 310                 return git_config_string(&user_agent, var, value);
 311
 312         if (!strcmp("http.emptyauth", var)) {
 313                 curl_empty_auth = git_config_bool(var, value);
 314                 return 0;
 315         }
 316
 317         if (!strcmp("http.pinnedpubkey", var)) {
 318 #if LIBCURL_VERSION_NUM >= 0x072c00
 319                 return git_config_pathname(&ssl_pinnedkey, var, value);
 320 #else
 321                 warning(_("Public key pinning not supported with cURL < 7.44.0"));
 322                 return 0;
 323 #endif
 324         }
 325
 326         /* Fall back on the default ones */
 327         return git_default_config(var, value, cb);
 328 }
 329
 330 static void init_curl_http_auth(CURL *result)
 331 {
 332         if (!http_auth.username) {
 333                 if (curl_empty_auth)
 334                         curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 335                 return;
 336         }
 337
 338         credential_fill(&http_auth);
 339
 340 #if LIBCURL_VERSION_NUM >= 0x071301
 341         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 342         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 343 #else
 344         {
 345                 static struct strbuf up = STRBUF_INIT;
 346                 /*
 347                  * Note that we assume we only ever have a single set of
 348                  * credentials in a given program run, so we do not have
 349                  * to worry about updating this buffer, only setting its
 350                  * initial value.
 351                  */
 352                 if (!up.len)
 353                         strbuf_addf(&up, "%s:%s",
 354                                 http_auth.username, http_auth.password);
 355                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 356         }
 357 #endif
 358 }
 359
 360 /* *var must be free-able */
 361 static void var_override(const char **var, char *value)
 362 {
 363         if (value) {
 364                 free((void *)*var);
 365                 *var = xstrdup(value);
 366         }
 367 }
 368
 369 static void set_proxyauth_name_password(CURL *result)
 370 {
 371 #if LIBCURL_VERSION_NUM >= 0x071301
 372                 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 373                         proxy_auth.username);
 374                 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 375                         proxy_auth.password);
 376 #else
 377                 struct strbuf s = STRBUF_INIT;
 378
 379                 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 380                 strbuf_addch(&s, ':');
 381                 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 382                 curl_proxyuserpwd = strbuf_detach(&s, NULL);
 383                 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 384 #endif
 385 }
 386
 387 static void init_curl_proxy_auth(CURL *result)
 388 {
 389         if (proxy_auth.username) {
 390                 if (!proxy_auth.password)
 391                         credential_fill(&proxy_auth);
 392                 set_proxyauth_name_password(result);
 393         }
 394
 395         var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 396
 397 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 398         if (http_proxy_authmethod) {
 399                 int i;
 400                 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 401                         if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 402                                 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 403                                                 proxy_authmethods[i].curlauth_param);
 404                                 break;
 405                         }
 406                 }
 407                 if (i == ARRAY_SIZE(proxy_authmethods)) {
 408                         warning("unsupported proxy authentication method %s: using anyauth",
 409                                         http_proxy_authmethod);
 410                         curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 411                 }
 412         }
 413         else
 414                 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 415 #endif
 416 }
 417
 418 static int has_cert_password(void)
 419 {
 420         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 421                 return 0;
 422         if (!cert_auth.password) {
 423                 cert_auth.protocol = xstrdup("cert");
 424                 cert_auth.username = xstrdup("");
 425                 cert_auth.path = xstrdup(ssl_cert);
 426                 credential_fill(&cert_auth);
 427         }
 428         return 1;
 429 }
 430
 431 #if LIBCURL_VERSION_NUM >= 0x071900
 432 static void set_curl_keepalive(CURL *c)
 433 {
 434         curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 435 }
 436
 437 #elif LIBCURL_VERSION_NUM >= 0x071000
 438 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 439 {
 440         int ka = 1;
 441         int rc;
 442         socklen_t len = (socklen_t)sizeof(ka);
 443
 444         if (type != CURLSOCKTYPE_IPCXN)
 445                 return 0;
 446
 447         rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 448         if (rc < 0)
 449                 warning("unable to set SO_KEEPALIVE on socket %s",
 450                         strerror(errno));
 451
 452         return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 453 }
 454
 455 static void set_curl_keepalive(CURL *c)
 456 {
 457         curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 458 }
 459
 460 #else
 461 static void set_curl_keepalive(CURL *c)
 462 {
 463         /* not supported on older curl versions */
 464 }
 465 #endif
 466
 467 static CURL *get_curl_handle(void)
 468 {
 469         CURL *result = curl_easy_init();
 470         long allowed_protocols = 0;
 471
 472         if (!result)
 473                 die("curl_easy_init failed");
 474
 475         if (!curl_ssl_verify) {
 476                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 477                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 478         } else {
 479                 /* Verify authenticity of the peer's certificate */
 480                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 481                 /* The name in the cert must match whom we tried to connect */
 482                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 483         }
 484
 485 #if LIBCURL_VERSION_NUM >= 0x070907
 486         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 487 #endif
 488 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 489         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 490 #endif
 491
 492         if (http_proactive_auth)
 493                 init_curl_http_auth(result);
 494
 495         if (getenv("GIT_SSL_VERSION"))
 496                 ssl_version = getenv("GIT_SSL_VERSION");
 497         if (ssl_version && *ssl_version) {
 498                 int i;
 499                 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 500                         if (!strcmp(ssl_version, sslversions[i].name)) {
 501                                 curl_easy_setopt(result, CURLOPT_SSLVERSION,
 502                                                  sslversions[i].ssl_version);
 503                                 break;
 504                         }
 505                 }
 506                 if (i == ARRAY_SIZE(sslversions))
 507                         warning("unsupported ssl version %s: using default",
 508                                 ssl_version);
 509         }
 510
 511         if (getenv("GIT_SSL_CIPHER_LIST"))
 512                 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 513         if (ssl_cipherlist != NULL && *ssl_cipherlist)
 514                 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 515                                 ssl_cipherlist);
 516
 517         if (ssl_cert != NULL)
 518                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 519         if (has_cert_password())
 520                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 521 #if LIBCURL_VERSION_NUM >= 0x070903
 522         if (ssl_key != NULL)
 523                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 524 #endif
 525 #if LIBCURL_VERSION_NUM >= 0x070908
 526         if (ssl_capath != NULL)
 527                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 528 #endif
 529 #if LIBCURL_VERSION_NUM >= 0x072c00
 530         if (ssl_pinnedkey != NULL)
 531                 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 532 #endif
 533         if (ssl_cainfo != NULL)
 534                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 535
 536         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 537                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 538                                  curl_low_speed_limit);
 539                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 540                                  curl_low_speed_time);
 541         }
 542
 543         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 544         curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 545 #if LIBCURL_VERSION_NUM >= 0x071301
 546         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 547 #elif LIBCURL_VERSION_NUM >= 0x071101
 548         curl_easy_setopt(result, CURLOPT_POST301, 1);
 549 #endif
 550 #if LIBCURL_VERSION_NUM >= 0x071304
 551         if (is_transport_allowed("http"))
 552                 allowed_protocols |= CURLPROTO_HTTP;
 553         if (is_transport_allowed("https"))
 554                 allowed_protocols |= CURLPROTO_HTTPS;
 555         if (is_transport_allowed("ftp"))
 556                 allowed_protocols |= CURLPROTO_FTP;
 557         if (is_transport_allowed("ftps"))
 558                 allowed_protocols |= CURLPROTO_FTPS;
 559         curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 560 #else
 561         if (transport_restrict_protocols())
 562                 warning("protocol restrictions not applied to curl redirects because\n"
 563                         "your curl version is too old (>= 7.19.4)");
 564 #endif
 565
 566         if (getenv("GIT_CURL_VERBOSE"))
 567                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 568
 569         curl_easy_setopt(result, CURLOPT_USERAGENT,
 570                 user_agent ? user_agent : git_user_agent());
 571
 572         if (curl_ftp_no_epsv)
 573                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 574
 575 #ifdef CURLOPT_USE_SSL
 576         if (curl_ssl_try)
 577                 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 578 #endif
 579
 580         /*
 581          * CURL also examines these variables as a fallback; but we need to query
 582          * them here in order to decide whether to prompt for missing password (cf.
 583          * init_curl_proxy_auth()).
 584          *
 585          * Unlike many other common environment variables, these are historically
 586          * lowercase only. It appears that CURL did not know this and implemented
 587          * only uppercase variants, which was later corrected to take both - with
 588          * the exception of http_proxy, which is lowercase only also in CURL. As
 589          * the lowercase versions are the historical quasi-standard, they take
 590          * precedence here, as in CURL.
 591          */
 592         if (!curl_http_proxy) {
 593                 if (!strcmp(http_auth.protocol, "https")) {
 594                         var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 595                         var_override(&curl_http_proxy, getenv("https_proxy"));
 596                 } else {
 597                         var_override(&curl_http_proxy, getenv("http_proxy"));
 598                 }
 599                 if (!curl_http_proxy) {
 600                         var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 601                         var_override(&curl_http_proxy, getenv("all_proxy"));
 602                 }
 603         }
 604
 605         if (curl_http_proxy) {
 606                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 607 #if LIBCURL_VERSION_NUM >= 0x071800
 608                 if (starts_with(curl_http_proxy, "socks5"))
 609                         curl_easy_setopt(result,
 610                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 611                 else if (starts_with(curl_http_proxy, "socks4a"))
 612                         curl_easy_setopt(result,
 613                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 614                 else if (starts_with(curl_http_proxy, "socks"))
 615                         curl_easy_setopt(result,
 616                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 617 #endif
 618                 if (strstr(curl_http_proxy, "://"))
 619                         credential_from_url(&proxy_auth, curl_http_proxy);
 620                 else {
 621                         struct strbuf url = STRBUF_INIT;
 622                         strbuf_addf(&url, "http://%s", curl_http_proxy);
 623                         credential_from_url(&proxy_auth, url.buf);
 624                         strbuf_release(&url);
 625                 }
 626
 627                 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 628 #if LIBCURL_VERSION_NUM >= 0x071304
 629                 var_override(&curl_no_proxy, getenv("NO_PROXY"));
 630                 var_override(&curl_no_proxy, getenv("no_proxy"));
 631                 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 632 #endif
 633         }
 634         init_curl_proxy_auth(result);
 635
 636         set_curl_keepalive(result);
 637
 638         return result;
 639 }
 640
 641 static void set_from_env(const char **var, const char *envname)
 642 {
 643         const char *val = getenv(envname);
 644         if (val)
 645                 *var = val;
 646 }
 647
 648 void http_init(struct remote *remote, const char *url, int proactive_auth)
 649 {
 650         char *low_speed_limit;
 651         char *low_speed_time;
 652         char *normalized_url;
 653         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 654
 655         config.section = "http";
 656         config.key = NULL;
 657         config.collect_fn = http_options;
 658         config.cascade_fn = git_default_config;
 659         config.cb = NULL;
 660
 661         http_is_verbose = 0;
 662         normalized_url = url_normalize(url, &config.url);
 663
 664         git_config(urlmatch_config_entry, &config);
 665         free(normalized_url);
 666
 667         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 668                 die("curl_global_init failed");
 669
 670         http_proactive_auth = proactive_auth;
 671
 672         if (remote && remote->http_proxy)
 673                 curl_http_proxy = xstrdup(remote->http_proxy);
 674
 675         if (remote)
 676                 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 677
 678         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 679         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 680
 681 #ifdef USE_CURL_MULTI
 682         {
 683                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 684                 if (http_max_requests != NULL)
 685                         max_requests = atoi(http_max_requests);
 686         }
 687
 688         curlm = curl_multi_init();
 689         if (!curlm)
 690                 die("curl_multi_init failed");
 691 #endif
 692
 693         if (getenv("GIT_SSL_NO_VERIFY"))
 694                 curl_ssl_verify = 0;
 695
 696         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 697 #if LIBCURL_VERSION_NUM >= 0x070903
 698         set_from_env(&ssl_key, "GIT_SSL_KEY");
 699 #endif
 700 #if LIBCURL_VERSION_NUM >= 0x070908
 701         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 702 #endif
 703         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 704
 705         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 706
 707         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 708         if (low_speed_limit != NULL)
 709                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 710         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 711         if (low_speed_time != NULL)
 712                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 713
 714         if (curl_ssl_verify == -1)
 715                 curl_ssl_verify = 1;
 716
 717         curl_session_count = 0;
 718 #ifdef USE_CURL_MULTI
 719         if (max_requests < 1)
 720                 max_requests = DEFAULT_MAX_REQUESTS;
 721 #endif
 722
 723         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 724                 curl_ftp_no_epsv = 1;
 725
 726         if (url) {
 727                 credential_from_url(&http_auth, url);
 728                 if (!ssl_cert_password_required &&
 729                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 730                     starts_with(url, "https://"))
 731                         ssl_cert_password_required = 1;
 732         }
 733
 734 #ifndef NO_CURL_EASY_DUPHANDLE
 735         curl_default = get_curl_handle();
 736 #endif
 737 }
 738
 739 void http_cleanup(void)
 740 {
 741         struct active_request_slot *slot = active_queue_head;
 742
 743         while (slot != NULL) {
 744                 struct active_request_slot *next = slot->next;
 745                 if (slot->curl != NULL) {
 746 #ifdef USE_CURL_MULTI
 747                         curl_multi_remove_handle(curlm, slot->curl);
 748 #endif
 749                         curl_easy_cleanup(slot->curl);
 750                 }
 751                 free(slot);
 752                 slot = next;
 753         }
 754         active_queue_head = NULL;
 755
 756 #ifndef NO_CURL_EASY_DUPHANDLE
 757         curl_easy_cleanup(curl_default);
 758 #endif
 759
 760 #ifdef USE_CURL_MULTI
 761         curl_multi_cleanup(curlm);
 762 #endif
 763         curl_global_cleanup();
 764
 765         curl_slist_free_all(pragma_header);
 766         pragma_header = NULL;
 767
 768         curl_slist_free_all(no_pragma_header);
 769         no_pragma_header = NULL;
 770
 771         if (curl_http_proxy) {
 772                 free((void *)curl_http_proxy);
 773                 curl_http_proxy = NULL;
 774         }
 775
 776         if (proxy_auth.password) {
 777                 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
 778                 free(proxy_auth.password);
 779                 proxy_auth.password = NULL;
 780         }
 781
 782         free((void *)curl_proxyuserpwd);
 783         curl_proxyuserpwd = NULL;
 784
 785         free((void *)http_proxy_authmethod);
 786         http_proxy_authmethod = NULL;
 787
 788         if (cert_auth.password != NULL) {
 789                 memset(cert_auth.password, 0, strlen(cert_auth.password));
 790                 free(cert_auth.password);
 791                 cert_auth.password = NULL;
 792         }
 793         ssl_cert_password_required = 0;
 794
 795         free(cached_accept_language);
 796         cached_accept_language = NULL;
 797 }
 798
 799 struct active_request_slot *get_active_slot(void)
 800 {
 801         struct active_request_slot *slot = active_queue_head;
 802         struct active_request_slot *newslot;
 803
 804 #ifdef USE_CURL_MULTI
 805         int num_transfers;
 806
 807         /* Wait for a slot to open up if the queue is full */
 808         while (active_requests >= max_requests) {
 809                 curl_multi_perform(curlm, &num_transfers);
 810                 if (num_transfers < active_requests)
 811                         process_curl_messages();
 812         }
 813 #endif
 814
 815         while (slot != NULL && slot->in_use)
 816                 slot = slot->next;
 817
 818         if (slot == NULL) {
 819                 newslot = xmalloc(sizeof(*newslot));
 820                 newslot->curl = NULL;
 821                 newslot->in_use = 0;
 822                 newslot->next = NULL;
 823
 824                 slot = active_queue_head;
 825                 if (slot == NULL) {
 826                         active_queue_head = newslot;
 827                 } else {
 828                         while (slot->next != NULL)
 829                                 slot = slot->next;
 830                         slot->next = newslot;
 831                 }
 832                 slot = newslot;
 833         }
 834
 835         if (slot->curl == NULL) {
 836 #ifdef NO_CURL_EASY_DUPHANDLE
 837                 slot->curl = get_curl_handle();
 838 #else
 839                 slot->curl = curl_easy_duphandle(curl_default);
 840 #endif
 841                 curl_session_count++;
 842         }
 843
 844         active_requests++;
 845         slot->in_use = 1;
 846         slot->results = NULL;
 847         slot->finished = NULL;
 848         slot->callback_data = NULL;
 849         slot->callback_func = NULL;
 850         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 851         if (curl_save_cookies)
 852                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 853         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 854         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 855         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 856         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 857         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 858         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 859         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 860         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 861         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 862         curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
 863
 864 #if LIBCURL_VERSION_NUM >= 0x070a08
 865         curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
 866 #endif
 867 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 868         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 869 #endif
 870         if (http_auth.password || curl_empty_auth)
 871                 init_curl_http_auth(slot->curl);
 872
 873         return slot;
 874 }
 875
 876 int start_active_slot(struct active_request_slot *slot)
 877 {
 878 #ifdef USE_CURL_MULTI
 879         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 880         int num_transfers;
 881
 882         if (curlm_result != CURLM_OK &&
 883             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 884                 active_requests--;
 885                 slot->in_use = 0;
 886                 return 0;
 887         }
 888
 889         /*
 890          * We know there must be something to do, since we just added
 891          * something.
 892          */
 893         curl_multi_perform(curlm, &num_transfers);
 894 #endif
 895         return 1;
 896 }
 897
 898 #ifdef USE_CURL_MULTI
 899 struct fill_chain {
 900         void *data;
 901         int (*fill)(void *);
 902         struct fill_chain *next;
 903 };
 904
 905 static struct fill_chain *fill_cfg;
 906
 907 void add_fill_function(void *data, int (*fill)(void *))
 908 {
 909         struct fill_chain *new = xmalloc(sizeof(*new));
 910         struct fill_chain **linkp = &fill_cfg;
 911         new->data = data;
 912         new->fill = fill;
 913         new->next = NULL;
 914         while (*linkp)
 915                 linkp = &(*linkp)->next;
 916         *linkp = new;
 917 }
 918
 919 void fill_active_slots(void)
 920 {
 921         struct active_request_slot *slot = active_queue_head;
 922
 923         while (active_requests < max_requests) {
 924                 struct fill_chain *fill;
 925                 for (fill = fill_cfg; fill; fill = fill->next)
 926                         if (fill->fill(fill->data))
 927                                 break;
 928
 929                 if (!fill)
 930                         break;
 931         }
 932
 933         while (slot != NULL) {
 934                 if (!slot->in_use && slot->curl != NULL
 935                         && curl_session_count > min_curl_sessions) {
 936                         curl_easy_cleanup(slot->curl);
 937                         slot->curl = NULL;
 938                         curl_session_count--;
 939                 }
 940                 slot = slot->next;
 941         }
 942 }
 943
 944 void step_active_slots(void)
 945 {
 946         int num_transfers;
 947         CURLMcode curlm_result;
 948
 949         do {
 950                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 951         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 952         if (num_transfers < active_requests) {
 953                 process_curl_messages();
 954                 fill_active_slots();
 955         }
 956 }
 957 #endif
 958
 959 void run_active_slot(struct active_request_slot *slot)
 960 {
 961 #ifdef USE_CURL_MULTI
 962         fd_set readfds;
 963         fd_set writefds;
 964         fd_set excfds;
 965         int max_fd;
 966         struct timeval select_timeout;
 967         int finished = 0;
 968
 969         slot->finished = &finished;
 970         while (!finished) {
 971                 step_active_slots();
 972
 973                 if (slot->in_use) {
 974 #if LIBCURL_VERSION_NUM >= 0x070f04
 975                         long curl_timeout;
 976                         curl_multi_timeout(curlm, &curl_timeout);
 977                         if (curl_timeout == 0) {
 978                                 continue;
 979                         } else if (curl_timeout == -1) {
 980                                 select_timeout.tv_sec  = 0;
 981                                 select_timeout.tv_usec = 50000;
 982                         } else {
 983                                 select_timeout.tv_sec  =  curl_timeout / 1000;
 984                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 985                         }
 986 #else
 987                         select_timeout.tv_sec  = 0;
 988                         select_timeout.tv_usec = 50000;
 989 #endif
 990
 991                         max_fd = -1;
 992                         FD_ZERO(&readfds);
 993                         FD_ZERO(&writefds);
 994                         FD_ZERO(&excfds);
 995                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 996
 997                         /*
 998                          * It can happen that curl_multi_timeout returns a pathologically
 999                          * long timeout when curl_multi_fdset returns no file descriptors
1000                          * to read.  See commit message for more details.
1001                          */
1002                         if (max_fd < 0 &&
1003                             (select_timeout.tv_sec > 0 ||
1004                              select_timeout.tv_usec > 50000)) {
1005                                 select_timeout.tv_sec  = 0;
1006                                 select_timeout.tv_usec = 50000;
1007                         }
1008
1009                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1010                 }
1011         }
1012 #else
1013         while (slot->in_use) {
1014                 slot->curl_result = curl_easy_perform(slot->curl);
1015                 finish_active_slot(slot);
1016         }
1017 #endif
1018 }
1019
1020 static void release_active_slot(struct active_request_slot *slot)
1021 {
1022         closedown_active_slot(slot);
1023         if (slot->curl && curl_session_count > min_curl_sessions) {
1024 #ifdef USE_CURL_MULTI
1025                 curl_multi_remove_handle(curlm, slot->curl);
1026 #endif
1027                 curl_easy_cleanup(slot->curl);
1028                 slot->curl = NULL;
1029                 curl_session_count--;
1030         }
1031 #ifdef USE_CURL_MULTI
1032         fill_active_slots();
1033 #endif
1034 }
1035
1036 void finish_all_active_slots(void)
1037 {
1038         struct active_request_slot *slot = active_queue_head;
1039
1040         while (slot != NULL)
1041                 if (slot->in_use) {
1042                         run_active_slot(slot);
1043                         slot = active_queue_head;
1044                 } else {
1045                         slot = slot->next;
1046                 }
1047 }
1048
1049 /* Helpers for modifying and creating URLs */
1050 static inline int needs_quote(int ch)
1051 {
1052         if (((ch >= 'A') && (ch <= 'Z'))
1053                         || ((ch >= 'a') && (ch <= 'z'))
1054                         || ((ch >= '0') && (ch <= '9'))
1055                         || (ch == '/')
1056                         || (ch == '-')
1057                         || (ch == '.'))
1058                 return 0;
1059         return 1;
1060 }
1061
1062 static char *quote_ref_url(const char *base, const char *ref)
1063 {
1064         struct strbuf buf = STRBUF_INIT;
1065         const char *cp;
1066         int ch;
1067
1068         end_url_with_slash(&buf, base);
1069
1070         for (cp = ref; (ch = *cp) != 0; cp++)
1071                 if (needs_quote(ch))
1072                         strbuf_addf(&buf, "%%%02x", ch);
1073                 else
1074                         strbuf_addch(&buf, *cp);
1075
1076         return strbuf_detach(&buf, NULL);
1077 }
1078
1079 void append_remote_object_url(struct strbuf *buf, const char *url,
1080                               const char *hex,
1081                               int only_two_digit_prefix)
1082 {
1083         end_url_with_slash(buf, url);
1084
1085         strbuf_addf(buf, "objects/%.*s/", 2, hex);
1086         if (!only_two_digit_prefix)
1087                 strbuf_addf(buf, "%s", hex+2);
1088 }
1089
1090 char *get_remote_object_url(const char *url, const char *hex,
1091                             int only_two_digit_prefix)
1092 {
1093         struct strbuf buf = STRBUF_INIT;
1094         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1095         return strbuf_detach(&buf, NULL);
1096 }
1097
1098 static int handle_curl_result(struct slot_results *results)
1099 {
1100         /*
1101          * If we see a failing http code with CURLE_OK, we have turned off
1102          * FAILONERROR (to keep the server's custom error response), and should
1103          * translate the code into failure here.
1104          */
1105         if (results->curl_result == CURLE_OK &&
1106             results->http_code >= 400) {
1107                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1108                 /*
1109                  * Normally curl will already have put the "reason phrase"
1110                  * from the server into curl_errorstr; unfortunately without
1111                  * FAILONERROR it is lost, so we can give only the numeric
1112                  * status code.
1113                  */
1114                 snprintf(curl_errorstr, sizeof(curl_errorstr),
1115                          "The requested URL returned error: %ld",
1116                          results->http_code);
1117         }
1118
1119         if (results->curl_result == CURLE_OK) {
1120                 credential_approve(&http_auth);
1121                 if (proxy_auth.password)
1122                         credential_approve(&proxy_auth);
1123                 return HTTP_OK;
1124         } else if (missing_target(results))
1125                 return HTTP_MISSING_TARGET;
1126         else if (results->http_code == 401) {
1127                 if (http_auth.username && http_auth.password) {
1128                         credential_reject(&http_auth);
1129                         return HTTP_NOAUTH;
1130                 } else {
1131 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1132                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1133 #endif
1134                         return HTTP_REAUTH;
1135                 }
1136         } else {
1137                 if (results->http_connectcode == 407)
1138                         credential_reject(&proxy_auth);
1139 #if LIBCURL_VERSION_NUM >= 0x070c00
1140                 if (!curl_errorstr[0])
1141                         strlcpy(curl_errorstr,
1142                                 curl_easy_strerror(results->curl_result),
1143                                 sizeof(curl_errorstr));
1144 #endif
1145                 return HTTP_ERROR;
1146         }
1147 }
1148
1149 int run_one_slot(struct active_request_slot *slot,
1150                  struct slot_results *results)
1151 {
1152         slot->results = results;
1153         if (!start_active_slot(slot)) {
1154                 snprintf(curl_errorstr, sizeof(curl_errorstr),
1155                          "failed to start HTTP request");
1156                 return HTTP_START_FAILED;
1157         }
1158
1159         run_active_slot(slot);
1160         return handle_curl_result(results);
1161 }
1162
1163 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1164 {
1165         char *ptr;
1166         CURLcode ret;
1167
1168         strbuf_reset(buf);
1169         ret = curl_easy_getinfo(curl, info, &ptr);
1170         if (!ret && ptr)
1171                 strbuf_addstr(buf, ptr);
1172         return ret;
1173 }
1174
1175 /*
1176  * Check for and extract a content-type parameter. "raw"
1177  * should be positioned at the start of the potential
1178  * parameter, with any whitespace already removed.
1179  *
1180  * "name" is the name of the parameter. The value is appended
1181  * to "out".
1182  */
1183 static int extract_param(const char *raw, const char *name,
1184                          struct strbuf *out)
1185 {
1186         size_t len = strlen(name);
1187
1188         if (strncasecmp(raw, name, len))
1189                 return -1;
1190         raw += len;
1191
1192         if (*raw != '=')
1193                 return -1;
1194         raw++;
1195
1196         while (*raw && !isspace(*raw) && *raw != ';')
1197                 strbuf_addch(out, *raw++);
1198         return 0;
1199 }
1200
1201 /*
1202  * Extract a normalized version of the content type, with any
1203  * spaces suppressed, all letters lowercased, and no trailing ";"
1204  * or parameters.
1205  *
1206  * Note that we will silently remove even invalid whitespace. For
1207  * example, "text / plain" is specifically forbidden by RFC 2616,
1208  * but "text/plain" is the only reasonable output, and this keeps
1209  * our code simple.
1210  *
1211  * If the "charset" argument is not NULL, store the value of any
1212  * charset parameter there.
1213  *
1214  * Example:
1215  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1216  *   "text / plain" -> "text/plain"
1217  */
1218 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1219                                  struct strbuf *charset)
1220 {
1221         const char *p;
1222
1223         strbuf_reset(type);
1224         strbuf_grow(type, raw->len);
1225         for (p = raw->buf; *p; p++) {
1226                 if (isspace(*p))
1227                         continue;
1228                 if (*p == ';') {
1229                         p++;
1230                         break;
1231                 }
1232                 strbuf_addch(type, tolower(*p));
1233         }
1234
1235         if (!charset)
1236                 return;
1237
1238         strbuf_reset(charset);
1239         while (*p) {
1240                 while (isspace(*p) || *p == ';')
1241                         p++;
1242                 if (!extract_param(p, "charset", charset))
1243                         return;
1244                 while (*p && !isspace(*p))
1245                         p++;
1246         }
1247
1248         if (!charset->len && starts_with(type->buf, "text/"))
1249                 strbuf_addstr(charset, "ISO-8859-1");
1250 }
1251
1252 static void write_accept_language(struct strbuf *buf)
1253 {
1254         /*
1255          * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1256          * that, q-value will be smaller than 0.001, the minimum q-value the
1257          * HTTP specification allows. See
1258          * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1259          */
1260         const int MAX_DECIMAL_PLACES = 3;
1261         const int MAX_LANGUAGE_TAGS = 1000;
1262         const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1263         char **language_tags = NULL;
1264         int num_langs = 0;
1265         const char *s = get_preferred_languages();
1266         int i;
1267         struct strbuf tag = STRBUF_INIT;
1268
1269         /* Don't add Accept-Language header if no language is preferred. */
1270         if (!s)
1271                 return;
1272
1273         /*
1274          * Split the colon-separated string of preferred languages into
1275          * language_tags array.
1276          */
1277         do {
1278                 /* collect language tag */
1279                 for (; *s && (isalnum(*s) || *s == '_'); s++)
1280                         strbuf_addch(&tag, *s == '_' ? '-' : *s);
1281
1282                 /* skip .codeset, @modifier and any other unnecessary parts */
1283                 while (*s && *s != ':')
1284                         s++;
1285
1286                 if (tag.len) {
1287                         num_langs++;
1288                         REALLOC_ARRAY(language_tags, num_langs);
1289                         language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1290                         if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1291                                 break;
1292                 }
1293         } while (*s++);
1294
1295         /* write Accept-Language header into buf */
1296         if (num_langs) {
1297                 int last_buf_len = 0;
1298                 int max_q;
1299                 int decimal_places;
1300                 char q_format[32];
1301
1302                 /* add '*' */
1303                 REALLOC_ARRAY(language_tags, num_langs + 1);
1304                 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1305
1306                 /* compute decimal_places */
1307                 for (max_q = 1, decimal_places = 0;
1308                      max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1309                      decimal_places++, max_q *= 10)
1310                         ;
1311
1312                 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1313
1314                 strbuf_addstr(buf, "Accept-Language: ");
1315
1316                 for (i = 0; i < num_langs; i++) {
1317                         if (i > 0)
1318                                 strbuf_addstr(buf, ", ");
1319
1320                         strbuf_addstr(buf, language_tags[i]);
1321
1322                         if (i > 0)
1323                                 strbuf_addf(buf, q_format, max_q - i);
1324
1325                         if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1326                                 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1327                                 break;
1328                         }
1329
1330                         last_buf_len = buf->len;
1331                 }
1332         }
1333
1334         /* free language tags -- last one is a static '*' */
1335         for (i = 0; i < num_langs - 1; i++)
1336                 free(language_tags[i]);
1337         free(language_tags);
1338 }
1339
1340 /*
1341  * Get an Accept-Language header which indicates user's preferred languages.
1342  *
1343  * Examples:
1344  *   LANGUAGE= -> ""
1345  *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1346  *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1347  *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1348  *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1349  *   LANGUAGE= LANG=C -> ""
1350  */
1351 static const char *get_accept_language(void)
1352 {
1353         if (!cached_accept_language) {
1354                 struct strbuf buf = STRBUF_INIT;
1355                 write_accept_language(&buf);
1356                 if (buf.len > 0)
1357                         cached_accept_language = strbuf_detach(&buf, NULL);
1358         }
1359
1360         return cached_accept_language;
1361 }
1362
1363 static void http_opt_request_remainder(CURL *curl, off_t pos)
1364 {
1365         char buf[128];
1366         xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1367         curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1368 }
1369
1370 /* http_request() targets */
1371 #define HTTP_REQUEST_STRBUF     0
1372 #define HTTP_REQUEST_FILE       1
1373
1374 static int http_request(const char *url,
1375                         void *result, int target,
1376                         const struct http_get_options *options)
1377 {
1378         struct active_request_slot *slot;
1379         struct slot_results results;
1380         struct curl_slist *headers = NULL;
1381         struct strbuf buf = STRBUF_INIT;
1382         const char *accept_language;
1383         int ret;
1384
1385         slot = get_active_slot();
1386         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1387
1388         if (result == NULL) {
1389                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1390         } else {
1391                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1392                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1393
1394                 if (target == HTTP_REQUEST_FILE) {
1395                         off_t posn = ftello(result);
1396                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1397                                          fwrite);
1398                         if (posn > 0)
1399                                 http_opt_request_remainder(slot->curl, posn);
1400                 } else
1401                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1402                                          fwrite_buffer);
1403         }
1404
1405         accept_language = get_accept_language();
1406
1407         if (accept_language)
1408                 headers = curl_slist_append(headers, accept_language);
1409
1410         strbuf_addstr(&buf, "Pragma:");
1411         if (options && options->no_cache)
1412                 strbuf_addstr(&buf, " no-cache");
1413         if (options && options->keep_error)
1414                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1415
1416         headers = curl_slist_append(headers, buf.buf);
1417
1418         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1419         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1420         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1421
1422         ret = run_one_slot(slot, &results);
1423
1424         if (options && options->content_type) {
1425                 struct strbuf raw = STRBUF_INIT;
1426                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1427                 extract_content_type(&raw, options->content_type,
1428                                      options->charset);
1429                 strbuf_release(&raw);
1430         }
1431
1432         if (options && options->effective_url)
1433                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1434                                 options->effective_url);
1435
1436         curl_slist_free_all(headers);
1437         strbuf_release(&buf);
1438
1439         return ret;
1440 }
1441
1442 /*
1443  * Update the "base" url to a more appropriate value, as deduced by
1444  * redirects seen when requesting a URL starting with "url".
1445  *
1446  * The "asked" parameter is a URL that we asked curl to access, and must begin
1447  * with "base".
1448  *
1449  * The "got" parameter is the URL that curl reported to us as where we ended
1450  * up.
1451  *
1452  * Returns 1 if we updated the base url, 0 otherwise.
1453  *
1454  * Our basic strategy is to compare "base" and "asked" to find the bits
1455  * specific to our request. We then strip those bits off of "got" to yield the
1456  * new base. So for example, if our base is "http://example.com/foo.git",
1457  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1458  * with "https://other.example.com/foo.git/info/refs". We would want the
1459  * new URL to become "https://other.example.com/foo.git".
1460  *
1461  * Note that this assumes a sane redirect scheme. It's entirely possible
1462  * in the example above to end up at a URL that does not even end in
1463  * "info/refs".  In such a case we simply punt, as there is not much we can
1464  * do (and such a scheme is unlikely to represent a real git repository,
1465  * which means we are likely about to abort anyway).
1466  */
1467 static int update_url_from_redirect(struct strbuf *base,
1468                                     const char *asked,
1469                                     const struct strbuf *got)
1470 {
1471         const char *tail;
1472         size_t tail_len;
1473
1474         if (!strcmp(asked, got->buf))
1475                 return 0;
1476
1477         if (!skip_prefix(asked, base->buf, &tail))
1478                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1479                     asked, base->buf);
1480
1481         tail_len = strlen(tail);
1482
1483         if (got->len < tail_len ||
1484             strcmp(tail, got->buf + got->len - tail_len))
1485                 return 0; /* insane redirect scheme */
1486
1487         strbuf_reset(base);
1488         strbuf_add(base, got->buf, got->len - tail_len);
1489         return 1;
1490 }
1491
1492 static int http_request_reauth(const char *url,
1493                                void *result, int target,
1494                                struct http_get_options *options)
1495 {
1496         int ret = http_request(url, result, target, options);
1497
1498         if (options && options->effective_url && options->base_url) {
1499                 if (update_url_from_redirect(options->base_url,
1500                                              url, options->effective_url)) {
1501                         credential_from_url(&http_auth, options->base_url->buf);
1502                         url = options->effective_url->buf;
1503                 }
1504         }
1505
1506         if (ret != HTTP_REAUTH)
1507                 return ret;
1508
1509         /*
1510          * If we are using KEEP_ERROR, the previous request may have
1511          * put cruft into our output stream; we should clear it out before
1512          * making our next request. We only know how to do this for
1513          * the strbuf case, but that is enough to satisfy current callers.
1514          */
1515         if (options && options->keep_error) {
1516                 switch (target) {
1517                 case HTTP_REQUEST_STRBUF:
1518                         strbuf_reset(result);
1519                         break;
1520                 default:
1521                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1522                 }
1523         }
1524
1525         credential_fill(&http_auth);
1526
1527         return http_request(url, result, target, options);
1528 }
1529
1530 int http_get_strbuf(const char *url,
1531                     struct strbuf *result,
1532                     struct http_get_options *options)
1533 {
1534         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1535 }
1536
1537 /*
1538  * Downloads a URL and stores the result in the given file.
1539  *
1540  * If a previous interrupted download is detected (i.e. a previous temporary
1541  * file is still around) the download is resumed.
1542  */
1543 static int http_get_file(const char *url, const char *filename,
1544                          struct http_get_options *options)
1545 {
1546         int ret;
1547         struct strbuf tmpfile = STRBUF_INIT;
1548         FILE *result;
1549
1550         strbuf_addf(&tmpfile, "%s.temp", filename);
1551         result = fopen(tmpfile.buf, "a");
1552         if (!result) {
1553                 error("Unable to open local file %s", tmpfile.buf);
1554                 ret = HTTP_ERROR;
1555                 goto cleanup;
1556         }
1557
1558         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1559         fclose(result);
1560
1561         if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1562                 ret = HTTP_ERROR;
1563 cleanup:
1564         strbuf_release(&tmpfile);
1565         return ret;
1566 }
1567
1568 int http_fetch_ref(const char *base, struct ref *ref)
1569 {
1570         struct http_get_options options = {0};
1571         char *url;
1572         struct strbuf buffer = STRBUF_INIT;
1573         int ret = -1;
1574
1575         options.no_cache = 1;
1576
1577         url = quote_ref_url(base, ref->name);
1578         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1579                 strbuf_rtrim(&buffer);
1580                 if (buffer.len == 40)
1581                         ret = get_oid_hex(buffer.buf, &ref->old_oid);
1582                 else if (starts_with(buffer.buf, "ref: ")) {
1583                         ref->symref = xstrdup(buffer.buf + 5);
1584                         ret = 0;
1585                 }
1586         }
1587
1588         strbuf_release(&buffer);
1589         free(url);
1590         return ret;
1591 }
1592
1593 /* Helpers for fetching packs */
1594 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1595 {
1596         char *url, *tmp;
1597         struct strbuf buf = STRBUF_INIT;
1598
1599         if (http_is_verbose)
1600                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1601
1602         end_url_with_slash(&buf, base_url);
1603         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1604         url = strbuf_detach(&buf, NULL);
1605
1606         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1607         tmp = strbuf_detach(&buf, NULL);
1608
1609         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1610                 error("Unable to get pack index %s", url);
1611                 free(tmp);
1612                 tmp = NULL;
1613         }
1614
1615         free(url);
1616         return tmp;
1617 }
1618
1619 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1620         unsigned char *sha1, const char *base_url)
1621 {
1622         struct packed_git *new_pack;
1623         char *tmp_idx = NULL;
1624         int ret;
1625
1626         if (has_pack_index(sha1)) {
1627                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1628                 if (!new_pack)
1629                         return -1; /* parse_pack_index() already issued error message */
1630                 goto add_pack;
1631         }
1632
1633         tmp_idx = fetch_pack_index(sha1, base_url);
1634         if (!tmp_idx)
1635                 return -1;
1636
1637         new_pack = parse_pack_index(sha1, tmp_idx);
1638         if (!new_pack) {
1639                 unlink(tmp_idx);
1640                 free(tmp_idx);
1641
1642                 return -1; /* parse_pack_index() already issued error message */
1643         }
1644
1645         ret = verify_pack_index(new_pack);
1646         if (!ret) {
1647                 close_pack_index(new_pack);
1648                 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1649         }
1650         free(tmp_idx);
1651         if (ret)
1652                 return -1;
1653
1654 add_pack:
1655         new_pack->next = *packs_head;
1656         *packs_head = new_pack;
1657         return 0;
1658 }
1659
1660 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1661 {
1662         struct http_get_options options = {0};
1663         int ret = 0, i = 0;
1664         char *url, *data;
1665         struct strbuf buf = STRBUF_INIT;
1666         unsigned char sha1[20];
1667
1668         end_url_with_slash(&buf, base_url);
1669         strbuf_addstr(&buf, "objects/info/packs");
1670         url = strbuf_detach(&buf, NULL);
1671
1672         options.no_cache = 1;
1673         ret = http_get_strbuf(url, &buf, &options);
1674         if (ret != HTTP_OK)
1675                 goto cleanup;
1676
1677         data = buf.buf;
1678         while (i < buf.len) {
1679                 switch (data[i]) {
1680                 case 'P':
1681                         i++;
1682                         if (i + 52 <= buf.len &&
1683                             starts_with(data + i, " pack-") &&
1684                             starts_with(data + i + 46, ".pack\n")) {
1685                                 get_sha1_hex(data + i + 6, sha1);
1686                                 fetch_and_setup_pack_index(packs_head, sha1,
1687                                                       base_url);
1688                                 i += 51;
1689                                 break;
1690                         }
1691                 default:
1692                         while (i < buf.len && data[i] != '\n')
1693                                 i++;
1694                 }
1695                 i++;
1696         }
1697
1698 cleanup:
1699         free(url);
1700         return ret;
1701 }
1702
1703 void release_http_pack_request(struct http_pack_request *preq)
1704 {
1705         if (preq->packfile != NULL) {
1706                 fclose(preq->packfile);
1707                 preq->packfile = NULL;
1708         }
1709         preq->slot = NULL;
1710         free(preq->url);
1711         free(preq);
1712 }
1713
1714 int finish_http_pack_request(struct http_pack_request *preq)
1715 {
1716         struct packed_git **lst;
1717         struct packed_git *p = preq->target;
1718         char *tmp_idx;
1719         size_t len;
1720         struct child_process ip = CHILD_PROCESS_INIT;
1721         const char *ip_argv[8];
1722
1723         close_pack_index(p);
1724
1725         fclose(preq->packfile);
1726         preq->packfile = NULL;
1727
1728         lst = preq->lst;
1729         while (*lst != p)
1730                 lst = &((*lst)->next);
1731         *lst = (*lst)->next;
1732
1733         if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1734                 die("BUG: pack tmpfile does not end in .pack.temp?");
1735         tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1736
1737         ip_argv[0] = "index-pack";
1738         ip_argv[1] = "-o";
1739         ip_argv[2] = tmp_idx;
1740         ip_argv[3] = preq->tmpfile;
1741         ip_argv[4] = NULL;
1742
1743         ip.argv = ip_argv;
1744         ip.git_cmd = 1;
1745         ip.no_stdin = 1;
1746         ip.no_stdout = 1;
1747
1748         if (run_command(&ip)) {
1749                 unlink(preq->tmpfile);
1750                 unlink(tmp_idx);
1751                 free(tmp_idx);
1752                 return -1;
1753         }
1754
1755         unlink(sha1_pack_index_name(p->sha1));
1756
1757         if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1758          || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1759                 free(tmp_idx);
1760                 return -1;
1761         }
1762
1763         install_packed_git(p);
1764         free(tmp_idx);
1765         return 0;
1766 }
1767
1768 struct http_pack_request *new_http_pack_request(
1769         struct packed_git *target, const char *base_url)
1770 {
1771         off_t prev_posn = 0;
1772         struct strbuf buf = STRBUF_INIT;
1773         struct http_pack_request *preq;
1774
1775         preq = xcalloc(1, sizeof(*preq));
1776         preq->target = target;
1777
1778         end_url_with_slash(&buf, base_url);
1779         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1780                 sha1_to_hex(target->sha1));
1781         preq->url = strbuf_detach(&buf, NULL);
1782
1783         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1784                 sha1_pack_name(target->sha1));
1785         preq->packfile = fopen(preq->tmpfile, "a");
1786         if (!preq->packfile) {
1787                 error("Unable to open local file %s for pack",
1788                       preq->tmpfile);
1789                 goto abort;
1790         }
1791
1792         preq->slot = get_active_slot();
1793         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1794         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1795         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1796         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1797                 no_pragma_header);
1798
1799         /*
1800          * If there is data present from a previous transfer attempt,
1801          * resume where it left off
1802          */
1803         prev_posn = ftello(preq->packfile);
1804         if (prev_posn>0) {
1805                 if (http_is_verbose)
1806                         fprintf(stderr,
1807                                 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1808                                 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1809                 http_opt_request_remainder(preq->slot->curl, prev_posn);
1810         }
1811
1812         return preq;
1813
1814 abort:
1815         free(preq->url);
1816         free(preq);
1817         return NULL;
1818 }
1819
1820 /* Helpers for fetching objects (loose) */
1821 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1822                                void *data)
1823 {
1824         unsigned char expn[4096];
1825         size_t size = eltsize * nmemb;
1826         int posn = 0;
1827         struct http_object_request *freq =
1828                 (struct http_object_request *)data;
1829         do {
1830                 ssize_t retval = xwrite(freq->localfile,
1831                                         (char *) ptr + posn, size - posn);
1832                 if (retval < 0)
1833                         return posn;
1834                 posn += retval;
1835         } while (posn < size);
1836
1837         freq->stream.avail_in = size;
1838         freq->stream.next_in = (void *)ptr;
1839         do {
1840                 freq->stream.next_out = expn;
1841                 freq->stream.avail_out = sizeof(expn);
1842                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1843                 git_SHA1_Update(&freq->c, expn,
1844                                 sizeof(expn) - freq->stream.avail_out);
1845         } while (freq->stream.avail_in && freq->zret == Z_OK);
1846         return size;
1847 }
1848
1849 struct http_object_request *new_http_object_request(const char *base_url,
1850         unsigned char *sha1)
1851 {
1852         char *hex = sha1_to_hex(sha1);
1853         const char *filename;
1854         char prevfile[PATH_MAX];
1855         int prevlocal;
1856         char prev_buf[PREV_BUF_SIZE];
1857         ssize_t prev_read = 0;
1858         off_t prev_posn = 0;
1859         struct http_object_request *freq;
1860
1861         freq = xcalloc(1, sizeof(*freq));
1862         hashcpy(freq->sha1, sha1);
1863         freq->localfile = -1;
1864
1865         filename = sha1_file_name(sha1);
1866         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1867                  "%s.temp", filename);
1868
1869         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1870         unlink_or_warn(prevfile);
1871         rename(freq->tmpfile, prevfile);
1872         unlink_or_warn(freq->tmpfile);
1873
1874         if (freq->localfile != -1)
1875                 error("fd leakage in start: %d", freq->localfile);
1876         freq->localfile = open(freq->tmpfile,
1877                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1878         /*
1879          * This could have failed due to the "lazy directory creation";
1880          * try to mkdir the last path component.
1881          */
1882         if (freq->localfile < 0 && errno == ENOENT) {
1883                 char *dir = strrchr(freq->tmpfile, '/');
1884                 if (dir) {
1885                         *dir = 0;
1886                         mkdir(freq->tmpfile, 0777);
1887                         *dir = '/';
1888                 }
1889                 freq->localfile = open(freq->tmpfile,
1890                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1891         }
1892
1893         if (freq->localfile < 0) {
1894                 error("Couldn't create temporary file %s: %s",
1895                       freq->tmpfile, strerror(errno));
1896                 goto abort;
1897         }
1898
1899         git_inflate_init(&freq->stream);
1900
1901         git_SHA1_Init(&freq->c);
1902
1903         freq->url = get_remote_object_url(base_url, hex, 0);
1904
1905         /*
1906          * If a previous temp file is present, process what was already
1907          * fetched.
1908          */
1909         prevlocal = open(prevfile, O_RDONLY);
1910         if (prevlocal != -1) {
1911                 do {
1912                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1913                         if (prev_read>0) {
1914                                 if (fwrite_sha1_file(prev_buf,
1915                                                      1,
1916                                                      prev_read,
1917                                                      freq) == prev_read) {
1918                                         prev_posn += prev_read;
1919                                 } else {
1920                                         prev_read = -1;
1921                                 }
1922                         }
1923                 } while (prev_read > 0);
1924                 close(prevlocal);
1925         }
1926         unlink_or_warn(prevfile);
1927
1928         /*
1929          * Reset inflate/SHA1 if there was an error reading the previous temp
1930          * file; also rewind to the beginning of the local file.
1931          */
1932         if (prev_read == -1) {
1933                 memset(&freq->stream, 0, sizeof(freq->stream));
1934                 git_inflate_init(&freq->stream);
1935                 git_SHA1_Init(&freq->c);
1936                 if (prev_posn>0) {
1937                         prev_posn = 0;
1938                         lseek(freq->localfile, 0, SEEK_SET);
1939                         if (ftruncate(freq->localfile, 0) < 0) {
1940                                 error("Couldn't truncate temporary file %s: %s",
1941                                           freq->tmpfile, strerror(errno));
1942                                 goto abort;
1943                         }
1944                 }
1945         }
1946
1947         freq->slot = get_active_slot();
1948
1949         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1950         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1951         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1952         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1953         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1954
1955         /*
1956          * If we have successfully processed data from a previous fetch
1957          * attempt, only fetch the data we don't already have.
1958          */
1959         if (prev_posn>0) {
1960                 if (http_is_verbose)
1961                         fprintf(stderr,
1962                                 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1963                                 hex, (uintmax_t)prev_posn);
1964                 http_opt_request_remainder(freq->slot->curl, prev_posn);
1965         }
1966
1967         return freq;
1968
1969 abort:
1970         free(freq->url);
1971         free(freq);
1972         return NULL;
1973 }
1974
1975 void process_http_object_request(struct http_object_request *freq)
1976 {
1977         if (freq->slot == NULL)
1978                 return;
1979         freq->curl_result = freq->slot->curl_result;
1980         freq->http_code = freq->slot->http_code;
1981         freq->slot = NULL;
1982 }
1983
1984 int finish_http_object_request(struct http_object_request *freq)
1985 {
1986         struct stat st;
1987
1988         close(freq->localfile);
1989         freq->localfile = -1;
1990
1991         process_http_object_request(freq);
1992
1993         if (freq->http_code == 416) {
1994                 warning("requested range invalid; we may already have all the data.");
1995         } else if (freq->curl_result != CURLE_OK) {
1996                 if (stat(freq->tmpfile, &st) == 0)
1997                         if (st.st_size == 0)
1998                                 unlink_or_warn(freq->tmpfile);
1999                 return -1;
2000         }
2001
2002         git_inflate_end(&freq->stream);
2003         git_SHA1_Final(freq->real_sha1, &freq->c);
2004         if (freq->zret != Z_STREAM_END) {
2005                 unlink_or_warn(freq->tmpfile);
2006                 return -1;
2007         }
2008         if (hashcmp(freq->sha1, freq->real_sha1)) {
2009                 unlink_or_warn(freq->tmpfile);
2010                 return -1;
2011         }
2012         freq->rename =
2013                 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2014
2015         return freq->rename;
2016 }
2017
2018 void abort_http_object_request(struct http_object_request *freq)
2019 {
2020         unlink_or_warn(freq->tmpfile);
2021
2022         release_http_object_request(freq);
2023 }
2024
2025 void release_http_object_request(struct http_object_request *freq)
2026 {
2027         if (freq->localfile != -1) {
2028                 close(freq->localfile);
2029                 freq->localfile = -1;
2030         }
2031         if (freq->url != NULL) {
2032                 free(freq->url);
2033                 freq->url = NULL;
2034         }
2035         if (freq->slot != NULL) {
2036                 freq->slot->callback_func = NULL;
2037                 freq->slot->callback_data = NULL;
2038                 release_active_slot(freq->slot);
2039                 freq->slot = NULL;
2040         }
2041 }