Andrew's git / gitweb.git / http.c
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http.con commit doc: mention transfer data leaks in more places (235ec24)
   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
  15long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  16#else
  17long int git_curl_ipresolve;
  18#endif
  19int active_requests;
  20int http_is_verbose;
  21size_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
  27static int min_curl_sessions = 1;
  28static int curl_session_count;
  29#ifdef USE_CURL_MULTI
  30static int max_requests = -1;
  31static CURLM *curlm;
  32#endif
  33#ifndef NO_CURL_EASY_DUPHANDLE
  34static CURL *curl_default;
  35#endif
  36
  37#define PREV_BUF_SIZE 4096
  38
  39char curl_errorstr[CURL_ERROR_SIZE];
  40
  41static int curl_ssl_verify = -1;
  42static int curl_ssl_try;
  43static const char *ssl_cert;
  44static const char *ssl_cipherlist;
  45static const char *ssl_version;
  46static 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
  60static const char *ssl_key;
  61#endif
  62#if LIBCURL_VERSION_NUM >= 0x070908
  63static const char *ssl_capath;
  64#endif
  65#if LIBCURL_VERSION_NUM >= 0x072c00
  66static const char *ssl_pinnedkey;
  67#endif
  68static const char *ssl_cainfo;
  69static long curl_low_speed_limit = -1;
  70static long curl_low_speed_time = -1;
  71static int curl_ftp_no_epsv;
  72static const char *curl_http_proxy;
  73static const char *curl_no_proxy;
  74static const char *http_proxy_authmethod;
  75static 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};
  92static struct credential proxy_auth = CREDENTIAL_INIT;
  93static const char *curl_proxyuserpwd;
  94static const char *curl_cookie_file;
  95static int curl_save_cookies;
  96struct credential http_auth = CREDENTIAL_INIT;
  97static int http_proactive_auth;
  98static const char *user_agent;
  99static 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
 109static struct credential cert_auth = CREDENTIAL_INIT;
 110static int ssl_cert_password_required;
 111#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 112static unsigned long http_auth_methods = CURLAUTH_ANY;
 113#endif
 114
 115static struct curl_slist *pragma_header;
 116static struct curl_slist *no_pragma_header;
 117
 118static struct active_request_slot *active_queue_head;
 119
 120static char *cached_accept_language;
 121
 122size_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
 136curlioerr 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
 154size_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
 163size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 164{
 165        return eltsize * nmemb;
 166}
 167
 168static void closedown_active_slot(struct active_request_slot *slot)
 169{
 170        active_requests--;
 171        slot->in_use = 0;
 172}
 173
 174static 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
 203static 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
 232static 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_pathname(&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
 330static 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 */
 361static void var_override(const char **var, char *value)
 362{
 363        if (value) {
 364                free((void *)*var);
 365                *var = xstrdup(value);
 366        }
 367}
 368
 369static 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
 387static 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
 418static 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
 432static void set_curl_keepalive(CURL *c)
 433{
 434        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 435}
 436
 437#elif LIBCURL_VERSION_NUM >= 0x071000
 438static 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
 455static void set_curl_keepalive(CURL *c)
 456{
 457        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 458}
 459
 460#else
 461static void set_curl_keepalive(CURL *c)
 462{
 463        /* not supported on older curl versions */
 464}
 465#endif
 466
 467static 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, "socks5h"))
 609                        curl_easy_setopt(result,
 610                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
 611                else if (starts_with(curl_http_proxy, "socks5"))
 612                        curl_easy_setopt(result,
 613                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 614                else if (starts_with(curl_http_proxy, "socks4a"))
 615                        curl_easy_setopt(result,
 616                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 617                else if (starts_with(curl_http_proxy, "socks"))
 618                        curl_easy_setopt(result,
 619                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 620#endif
 621                if (strstr(curl_http_proxy, "://"))
 622                        credential_from_url(&proxy_auth, curl_http_proxy);
 623                else {
 624                        struct strbuf url = STRBUF_INIT;
 625                        strbuf_addf(&url, "http://%s", curl_http_proxy);
 626                        credential_from_url(&proxy_auth, url.buf);
 627                        strbuf_release(&url);
 628                }
 629
 630                curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 631#if LIBCURL_VERSION_NUM >= 0x071304
 632                var_override(&curl_no_proxy, getenv("NO_PROXY"));
 633                var_override(&curl_no_proxy, getenv("no_proxy"));
 634                curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 635#endif
 636        }
 637        init_curl_proxy_auth(result);
 638
 639        set_curl_keepalive(result);
 640
 641        return result;
 642}
 643
 644static void set_from_env(const char **var, const char *envname)
 645{
 646        const char *val = getenv(envname);
 647        if (val)
 648                *var = val;
 649}
 650
 651void http_init(struct remote *remote, const char *url, int proactive_auth)
 652{
 653        char *low_speed_limit;
 654        char *low_speed_time;
 655        char *normalized_url;
 656        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 657
 658        config.section = "http";
 659        config.key = NULL;
 660        config.collect_fn = http_options;
 661        config.cascade_fn = git_default_config;
 662        config.cb = NULL;
 663
 664        http_is_verbose = 0;
 665        normalized_url = url_normalize(url, &config.url);
 666
 667        git_config(urlmatch_config_entry, &config);
 668        free(normalized_url);
 669
 670        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 671                die("curl_global_init failed");
 672
 673        http_proactive_auth = proactive_auth;
 674
 675        if (remote && remote->http_proxy)
 676                curl_http_proxy = xstrdup(remote->http_proxy);
 677
 678        if (remote)
 679                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 680
 681        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 682        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 683
 684#ifdef USE_CURL_MULTI
 685        {
 686                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 687                if (http_max_requests != NULL)
 688                        max_requests = atoi(http_max_requests);
 689        }
 690
 691        curlm = curl_multi_init();
 692        if (!curlm)
 693                die("curl_multi_init failed");
 694#endif
 695
 696        if (getenv("GIT_SSL_NO_VERIFY"))
 697                curl_ssl_verify = 0;
 698
 699        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 700#if LIBCURL_VERSION_NUM >= 0x070903
 701        set_from_env(&ssl_key, "GIT_SSL_KEY");
 702#endif
 703#if LIBCURL_VERSION_NUM >= 0x070908
 704        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 705#endif
 706        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 707
 708        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 709
 710        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 711        if (low_speed_limit != NULL)
 712                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 713        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 714        if (low_speed_time != NULL)
 715                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 716
 717        if (curl_ssl_verify == -1)
 718                curl_ssl_verify = 1;
 719
 720        curl_session_count = 0;
 721#ifdef USE_CURL_MULTI
 722        if (max_requests < 1)
 723                max_requests = DEFAULT_MAX_REQUESTS;
 724#endif
 725
 726        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 727                curl_ftp_no_epsv = 1;
 728
 729        if (url) {
 730                credential_from_url(&http_auth, url);
 731                if (!ssl_cert_password_required &&
 732                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 733                    starts_with(url, "https://"))
 734                        ssl_cert_password_required = 1;
 735        }
 736
 737#ifndef NO_CURL_EASY_DUPHANDLE
 738        curl_default = get_curl_handle();
 739#endif
 740}
 741
 742void http_cleanup(void)
 743{
 744        struct active_request_slot *slot = active_queue_head;
 745
 746        while (slot != NULL) {
 747                struct active_request_slot *next = slot->next;
 748                if (slot->curl != NULL) {
 749#ifdef USE_CURL_MULTI
 750                        curl_multi_remove_handle(curlm, slot->curl);
 751#endif
 752                        curl_easy_cleanup(slot->curl);
 753                }
 754                free(slot);
 755                slot = next;
 756        }
 757        active_queue_head = NULL;
 758
 759#ifndef NO_CURL_EASY_DUPHANDLE
 760        curl_easy_cleanup(curl_default);
 761#endif
 762
 763#ifdef USE_CURL_MULTI
 764        curl_multi_cleanup(curlm);
 765#endif
 766        curl_global_cleanup();
 767
 768        curl_slist_free_all(pragma_header);
 769        pragma_header = NULL;
 770
 771        curl_slist_free_all(no_pragma_header);
 772        no_pragma_header = NULL;
 773
 774        if (curl_http_proxy) {
 775                free((void *)curl_http_proxy);
 776                curl_http_proxy = NULL;
 777        }
 778
 779        if (proxy_auth.password) {
 780                memset(proxy_auth.password, 0, strlen(proxy_auth.password));
 781                free(proxy_auth.password);
 782                proxy_auth.password = NULL;
 783        }
 784
 785        free((void *)curl_proxyuserpwd);
 786        curl_proxyuserpwd = NULL;
 787
 788        free((void *)http_proxy_authmethod);
 789        http_proxy_authmethod = NULL;
 790
 791        if (cert_auth.password != NULL) {
 792                memset(cert_auth.password, 0, strlen(cert_auth.password));
 793                free(cert_auth.password);
 794                cert_auth.password = NULL;
 795        }
 796        ssl_cert_password_required = 0;
 797
 798        free(cached_accept_language);
 799        cached_accept_language = NULL;
 800}
 801
 802struct active_request_slot *get_active_slot(void)
 803{
 804        struct active_request_slot *slot = active_queue_head;
 805        struct active_request_slot *newslot;
 806
 807#ifdef USE_CURL_MULTI
 808        int num_transfers;
 809
 810        /* Wait for a slot to open up if the queue is full */
 811        while (active_requests >= max_requests) {
 812                curl_multi_perform(curlm, &num_transfers);
 813                if (num_transfers < active_requests)
 814                        process_curl_messages();
 815        }
 816#endif
 817
 818        while (slot != NULL && slot->in_use)
 819                slot = slot->next;
 820
 821        if (slot == NULL) {
 822                newslot = xmalloc(sizeof(*newslot));
 823                newslot->curl = NULL;
 824                newslot->in_use = 0;
 825                newslot->next = NULL;
 826
 827                slot = active_queue_head;
 828                if (slot == NULL) {
 829                        active_queue_head = newslot;
 830                } else {
 831                        while (slot->next != NULL)
 832                                slot = slot->next;
 833                        slot->next = newslot;
 834                }
 835                slot = newslot;
 836        }
 837
 838        if (slot->curl == NULL) {
 839#ifdef NO_CURL_EASY_DUPHANDLE
 840                slot->curl = get_curl_handle();
 841#else
 842                slot->curl = curl_easy_duphandle(curl_default);
 843#endif
 844                curl_session_count++;
 845        }
 846
 847        active_requests++;
 848        slot->in_use = 1;
 849        slot->results = NULL;
 850        slot->finished = NULL;
 851        slot->callback_data = NULL;
 852        slot->callback_func = NULL;
 853        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 854        if (curl_save_cookies)
 855                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 856        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 857        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 858        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 859        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 860        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 861        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 862        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 863        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 864        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 865        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
 866
 867#if LIBCURL_VERSION_NUM >= 0x070a08
 868        curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
 869#endif
 870#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 871        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 872#endif
 873        if (http_auth.password || curl_empty_auth)
 874                init_curl_http_auth(slot->curl);
 875
 876        return slot;
 877}
 878
 879int start_active_slot(struct active_request_slot *slot)
 880{
 881#ifdef USE_CURL_MULTI
 882        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 883        int num_transfers;
 884
 885        if (curlm_result != CURLM_OK &&
 886            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 887                active_requests--;
 888                slot->in_use = 0;
 889                return 0;
 890        }
 891
 892        /*
 893         * We know there must be something to do, since we just added
 894         * something.
 895         */
 896        curl_multi_perform(curlm, &num_transfers);
 897#endif
 898        return 1;
 899}
 900
 901#ifdef USE_CURL_MULTI
 902struct fill_chain {
 903        void *data;
 904        int (*fill)(void *);
 905        struct fill_chain *next;
 906};
 907
 908static struct fill_chain *fill_cfg;
 909
 910void add_fill_function(void *data, int (*fill)(void *))
 911{
 912        struct fill_chain *new = xmalloc(sizeof(*new));
 913        struct fill_chain **linkp = &fill_cfg;
 914        new->data = data;
 915        new->fill = fill;
 916        new->next = NULL;
 917        while (*linkp)
 918                linkp = &(*linkp)->next;
 919        *linkp = new;
 920}
 921
 922void fill_active_slots(void)
 923{
 924        struct active_request_slot *slot = active_queue_head;
 925
 926        while (active_requests < max_requests) {
 927                struct fill_chain *fill;
 928                for (fill = fill_cfg; fill; fill = fill->next)
 929                        if (fill->fill(fill->data))
 930                                break;
 931
 932                if (!fill)
 933                        break;
 934        }
 935
 936        while (slot != NULL) {
 937                if (!slot->in_use && slot->curl != NULL
 938                        && curl_session_count > min_curl_sessions) {
 939                        curl_easy_cleanup(slot->curl);
 940                        slot->curl = NULL;
 941                        curl_session_count--;
 942                }
 943                slot = slot->next;
 944        }
 945}
 946
 947void step_active_slots(void)
 948{
 949        int num_transfers;
 950        CURLMcode curlm_result;
 951
 952        do {
 953                curlm_result = curl_multi_perform(curlm, &num_transfers);
 954        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 955        if (num_transfers < active_requests) {
 956                process_curl_messages();
 957                fill_active_slots();
 958        }
 959}
 960#endif
 961
 962void run_active_slot(struct active_request_slot *slot)
 963{
 964#ifdef USE_CURL_MULTI
 965        fd_set readfds;
 966        fd_set writefds;
 967        fd_set excfds;
 968        int max_fd;
 969        struct timeval select_timeout;
 970        int finished = 0;
 971
 972        slot->finished = &finished;
 973        while (!finished) {
 974                step_active_slots();
 975
 976                if (slot->in_use) {
 977#if LIBCURL_VERSION_NUM >= 0x070f04
 978                        long curl_timeout;
 979                        curl_multi_timeout(curlm, &curl_timeout);
 980                        if (curl_timeout == 0) {
 981                                continue;
 982                        } else if (curl_timeout == -1) {
 983                                select_timeout.tv_sec  = 0;
 984                                select_timeout.tv_usec = 50000;
 985                        } else {
 986                                select_timeout.tv_sec  =  curl_timeout / 1000;
 987                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 988                        }
 989#else
 990                        select_timeout.tv_sec  = 0;
 991                        select_timeout.tv_usec = 50000;
 992#endif
 993
 994                        max_fd = -1;
 995                        FD_ZERO(&readfds);
 996                        FD_ZERO(&writefds);
 997                        FD_ZERO(&excfds);
 998                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 999
1000                        /*
1001                         * It can happen that curl_multi_timeout returns a pathologically
1002                         * long timeout when curl_multi_fdset returns no file descriptors
1003                         * to read.  See commit message for more details.
1004                         */
1005                        if (max_fd < 0 &&
1006                            (select_timeout.tv_sec > 0 ||
1007                             select_timeout.tv_usec > 50000)) {
1008                                select_timeout.tv_sec  = 0;
1009                                select_timeout.tv_usec = 50000;
1010                        }
1011
1012                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1013                }
1014        }
1015#else
1016        while (slot->in_use) {
1017                slot->curl_result = curl_easy_perform(slot->curl);
1018                finish_active_slot(slot);
1019        }
1020#endif
1021}
1022
1023static void release_active_slot(struct active_request_slot *slot)
1024{
1025        closedown_active_slot(slot);
1026        if (slot->curl && curl_session_count > min_curl_sessions) {
1027#ifdef USE_CURL_MULTI
1028                curl_multi_remove_handle(curlm, slot->curl);
1029#endif
1030                curl_easy_cleanup(slot->curl);
1031                slot->curl = NULL;
1032                curl_session_count--;
1033        }
1034#ifdef USE_CURL_MULTI
1035        fill_active_slots();
1036#endif
1037}
1038
1039void finish_all_active_slots(void)
1040{
1041        struct active_request_slot *slot = active_queue_head;
1042
1043        while (slot != NULL)
1044                if (slot->in_use) {
1045                        run_active_slot(slot);
1046                        slot = active_queue_head;
1047                } else {
1048                        slot = slot->next;
1049                }
1050}
1051
1052/* Helpers for modifying and creating URLs */
1053static inline int needs_quote(int ch)
1054{
1055        if (((ch >= 'A') && (ch <= 'Z'))
1056                        || ((ch >= 'a') && (ch <= 'z'))
1057                        || ((ch >= '0') && (ch <= '9'))
1058                        || (ch == '/')
1059                        || (ch == '-')
1060                        || (ch == '.'))
1061                return 0;
1062        return 1;
1063}
1064
1065static char *quote_ref_url(const char *base, const char *ref)
1066{
1067        struct strbuf buf = STRBUF_INIT;
1068        const char *cp;
1069        int ch;
1070
1071        end_url_with_slash(&buf, base);
1072
1073        for (cp = ref; (ch = *cp) != 0; cp++)
1074                if (needs_quote(ch))
1075                        strbuf_addf(&buf, "%%%02x", ch);
1076                else
1077                        strbuf_addch(&buf, *cp);
1078
1079        return strbuf_detach(&buf, NULL);
1080}
1081
1082void append_remote_object_url(struct strbuf *buf, const char *url,
1083                              const char *hex,
1084                              int only_two_digit_prefix)
1085{
1086        end_url_with_slash(buf, url);
1087
1088        strbuf_addf(buf, "objects/%.*s/", 2, hex);
1089        if (!only_two_digit_prefix)
1090                strbuf_addf(buf, "%s", hex+2);
1091}
1092
1093char *get_remote_object_url(const char *url, const char *hex,
1094                            int only_two_digit_prefix)
1095{
1096        struct strbuf buf = STRBUF_INIT;
1097        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1098        return strbuf_detach(&buf, NULL);
1099}
1100
1101static int handle_curl_result(struct slot_results *results)
1102{
1103        /*
1104         * If we see a failing http code with CURLE_OK, we have turned off
1105         * FAILONERROR (to keep the server's custom error response), and should
1106         * translate the code into failure here.
1107         */
1108        if (results->curl_result == CURLE_OK &&
1109            results->http_code >= 400) {
1110                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1111                /*
1112                 * Normally curl will already have put the "reason phrase"
1113                 * from the server into curl_errorstr; unfortunately without
1114                 * FAILONERROR it is lost, so we can give only the numeric
1115                 * status code.
1116                 */
1117                snprintf(curl_errorstr, sizeof(curl_errorstr),
1118                         "The requested URL returned error: %ld",
1119                         results->http_code);
1120        }
1121
1122        if (results->curl_result == CURLE_OK) {
1123                credential_approve(&http_auth);
1124                if (proxy_auth.password)
1125                        credential_approve(&proxy_auth);
1126                return HTTP_OK;
1127        } else if (missing_target(results))
1128                return HTTP_MISSING_TARGET;
1129        else if (results->http_code == 401) {
1130                if (http_auth.username && http_auth.password) {
1131                        credential_reject(&http_auth);
1132                        return HTTP_NOAUTH;
1133                } else {
1134#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1135                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1136#endif
1137                        return HTTP_REAUTH;
1138                }
1139        } else {
1140                if (results->http_connectcode == 407)
1141                        credential_reject(&proxy_auth);
1142#if LIBCURL_VERSION_NUM >= 0x070c00
1143                if (!curl_errorstr[0])
1144                        strlcpy(curl_errorstr,
1145                                curl_easy_strerror(results->curl_result),
1146                                sizeof(curl_errorstr));
1147#endif
1148                return HTTP_ERROR;
1149        }
1150}
1151
1152int run_one_slot(struct active_request_slot *slot,
1153                 struct slot_results *results)
1154{
1155        slot->results = results;
1156        if (!start_active_slot(slot)) {
1157                snprintf(curl_errorstr, sizeof(curl_errorstr),
1158                         "failed to start HTTP request");
1159                return HTTP_START_FAILED;
1160        }
1161
1162        run_active_slot(slot);
1163        return handle_curl_result(results);
1164}
1165
1166static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1167{
1168        char *ptr;
1169        CURLcode ret;
1170
1171        strbuf_reset(buf);
1172        ret = curl_easy_getinfo(curl, info, &ptr);
1173        if (!ret && ptr)
1174                strbuf_addstr(buf, ptr);
1175        return ret;
1176}
1177
1178/*
1179 * Check for and extract a content-type parameter. "raw"
1180 * should be positioned at the start of the potential
1181 * parameter, with any whitespace already removed.
1182 *
1183 * "name" is the name of the parameter. The value is appended
1184 * to "out".
1185 */
1186static int extract_param(const char *raw, const char *name,
1187                         struct strbuf *out)
1188{
1189        size_t len = strlen(name);
1190
1191        if (strncasecmp(raw, name, len))
1192                return -1;
1193        raw += len;
1194
1195        if (*raw != '=')
1196                return -1;
1197        raw++;
1198
1199        while (*raw && !isspace(*raw) && *raw != ';')
1200                strbuf_addch(out, *raw++);
1201        return 0;
1202}
1203
1204/*
1205 * Extract a normalized version of the content type, with any
1206 * spaces suppressed, all letters lowercased, and no trailing ";"
1207 * or parameters.
1208 *
1209 * Note that we will silently remove even invalid whitespace. For
1210 * example, "text / plain" is specifically forbidden by RFC 2616,
1211 * but "text/plain" is the only reasonable output, and this keeps
1212 * our code simple.
1213 *
1214 * If the "charset" argument is not NULL, store the value of any
1215 * charset parameter there.
1216 *
1217 * Example:
1218 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1219 *   "text / plain" -> "text/plain"
1220 */
1221static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1222                                 struct strbuf *charset)
1223{
1224        const char *p;
1225
1226        strbuf_reset(type);
1227        strbuf_grow(type, raw->len);
1228        for (p = raw->buf; *p; p++) {
1229                if (isspace(*p))
1230                        continue;
1231                if (*p == ';') {
1232                        p++;
1233                        break;
1234                }
1235                strbuf_addch(type, tolower(*p));
1236        }
1237
1238        if (!charset)
1239                return;
1240
1241        strbuf_reset(charset);
1242        while (*p) {
1243                while (isspace(*p) || *p == ';')
1244                        p++;
1245                if (!extract_param(p, "charset", charset))
1246                        return;
1247                while (*p && !isspace(*p))
1248                        p++;
1249        }
1250
1251        if (!charset->len && starts_with(type->buf, "text/"))
1252                strbuf_addstr(charset, "ISO-8859-1");
1253}
1254
1255static void write_accept_language(struct strbuf *buf)
1256{
1257        /*
1258         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1259         * that, q-value will be smaller than 0.001, the minimum q-value the
1260         * HTTP specification allows. See
1261         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1262         */
1263        const int MAX_DECIMAL_PLACES = 3;
1264        const int MAX_LANGUAGE_TAGS = 1000;
1265        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1266        char **language_tags = NULL;
1267        int num_langs = 0;
1268        const char *s = get_preferred_languages();
1269        int i;
1270        struct strbuf tag = STRBUF_INIT;
1271
1272        /* Don't add Accept-Language header if no language is preferred. */
1273        if (!s)
1274                return;
1275
1276        /*
1277         * Split the colon-separated string of preferred languages into
1278         * language_tags array.
1279         */
1280        do {
1281                /* collect language tag */
1282                for (; *s && (isalnum(*s) || *s == '_'); s++)
1283                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1284
1285                /* skip .codeset, @modifier and any other unnecessary parts */
1286                while (*s && *s != ':')
1287                        s++;
1288
1289                if (tag.len) {
1290                        num_langs++;
1291                        REALLOC_ARRAY(language_tags, num_langs);
1292                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1293                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1294                                break;
1295                }
1296        } while (*s++);
1297
1298        /* write Accept-Language header into buf */
1299        if (num_langs) {
1300                int last_buf_len = 0;
1301                int max_q;
1302                int decimal_places;
1303                char q_format[32];
1304
1305                /* add '*' */
1306                REALLOC_ARRAY(language_tags, num_langs + 1);
1307                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1308
1309                /* compute decimal_places */
1310                for (max_q = 1, decimal_places = 0;
1311                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1312                     decimal_places++, max_q *= 10)
1313                        ;
1314
1315                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1316
1317                strbuf_addstr(buf, "Accept-Language: ");
1318
1319                for (i = 0; i < num_langs; i++) {
1320                        if (i > 0)
1321                                strbuf_addstr(buf, ", ");
1322
1323                        strbuf_addstr(buf, language_tags[i]);
1324
1325                        if (i > 0)
1326                                strbuf_addf(buf, q_format, max_q - i);
1327
1328                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1329                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1330                                break;
1331                        }
1332
1333                        last_buf_len = buf->len;
1334                }
1335        }
1336
1337        /* free language tags -- last one is a static '*' */
1338        for (i = 0; i < num_langs - 1; i++)
1339                free(language_tags[i]);
1340        free(language_tags);
1341}
1342
1343/*
1344 * Get an Accept-Language header which indicates user's preferred languages.
1345 *
1346 * Examples:
1347 *   LANGUAGE= -> ""
1348 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1349 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1350 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1351 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1352 *   LANGUAGE= LANG=C -> ""
1353 */
1354static const char *get_accept_language(void)
1355{
1356        if (!cached_accept_language) {
1357                struct strbuf buf = STRBUF_INIT;
1358                write_accept_language(&buf);
1359                if (buf.len > 0)
1360                        cached_accept_language = strbuf_detach(&buf, NULL);
1361        }
1362
1363        return cached_accept_language;
1364}
1365
1366static void http_opt_request_remainder(CURL *curl, off_t pos)
1367{
1368        char buf[128];
1369        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1370        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1371}
1372
1373/* http_request() targets */
1374#define HTTP_REQUEST_STRBUF     0
1375#define HTTP_REQUEST_FILE       1
1376
1377static int http_request(const char *url,
1378                        void *result, int target,
1379                        const struct http_get_options *options)
1380{
1381        struct active_request_slot *slot;
1382        struct slot_results results;
1383        struct curl_slist *headers = NULL;
1384        struct strbuf buf = STRBUF_INIT;
1385        const char *accept_language;
1386        int ret;
1387
1388        slot = get_active_slot();
1389        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1390
1391        if (result == NULL) {
1392                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1393        } else {
1394                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1395                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1396
1397                if (target == HTTP_REQUEST_FILE) {
1398                        off_t posn = ftello(result);
1399                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1400                                         fwrite);
1401                        if (posn > 0)
1402                                http_opt_request_remainder(slot->curl, posn);
1403                } else
1404                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1405                                         fwrite_buffer);
1406        }
1407
1408        accept_language = get_accept_language();
1409
1410        if (accept_language)
1411                headers = curl_slist_append(headers, accept_language);
1412
1413        strbuf_addstr(&buf, "Pragma:");
1414        if (options && options->no_cache)
1415                strbuf_addstr(&buf, " no-cache");
1416        if (options && options->keep_error)
1417                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1418
1419        headers = curl_slist_append(headers, buf.buf);
1420
1421        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1422        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1423        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1424
1425        ret = run_one_slot(slot, &results);
1426
1427        if (options && options->content_type) {
1428                struct strbuf raw = STRBUF_INIT;
1429                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1430                extract_content_type(&raw, options->content_type,
1431                                     options->charset);
1432                strbuf_release(&raw);
1433        }
1434
1435        if (options && options->effective_url)
1436                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1437                                options->effective_url);
1438
1439        curl_slist_free_all(headers);
1440        strbuf_release(&buf);
1441
1442        return ret;
1443}
1444
1445/*
1446 * Update the "base" url to a more appropriate value, as deduced by
1447 * redirects seen when requesting a URL starting with "url".
1448 *
1449 * The "asked" parameter is a URL that we asked curl to access, and must begin
1450 * with "base".
1451 *
1452 * The "got" parameter is the URL that curl reported to us as where we ended
1453 * up.
1454 *
1455 * Returns 1 if we updated the base url, 0 otherwise.
1456 *
1457 * Our basic strategy is to compare "base" and "asked" to find the bits
1458 * specific to our request. We then strip those bits off of "got" to yield the
1459 * new base. So for example, if our base is "http://example.com/foo.git",
1460 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1461 * with "https://other.example.com/foo.git/info/refs". We would want the
1462 * new URL to become "https://other.example.com/foo.git".
1463 *
1464 * Note that this assumes a sane redirect scheme. It's entirely possible
1465 * in the example above to end up at a URL that does not even end in
1466 * "info/refs".  In such a case we simply punt, as there is not much we can
1467 * do (and such a scheme is unlikely to represent a real git repository,
1468 * which means we are likely about to abort anyway).
1469 */
1470static int update_url_from_redirect(struct strbuf *base,
1471                                    const char *asked,
1472                                    const struct strbuf *got)
1473{
1474        const char *tail;
1475        size_t tail_len;
1476
1477        if (!strcmp(asked, got->buf))
1478                return 0;
1479
1480        if (!skip_prefix(asked, base->buf, &tail))
1481                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1482                    asked, base->buf);
1483
1484        tail_len = strlen(tail);
1485
1486        if (got->len < tail_len ||
1487            strcmp(tail, got->buf + got->len - tail_len))
1488                return 0; /* insane redirect scheme */
1489
1490        strbuf_reset(base);
1491        strbuf_add(base, got->buf, got->len - tail_len);
1492        return 1;
1493}
1494
1495static int http_request_reauth(const char *url,
1496                               void *result, int target,
1497                               struct http_get_options *options)
1498{
1499        int ret = http_request(url, result, target, options);
1500
1501        if (options && options->effective_url && options->base_url) {
1502                if (update_url_from_redirect(options->base_url,
1503                                             url, options->effective_url)) {
1504                        credential_from_url(&http_auth, options->base_url->buf);
1505                        url = options->effective_url->buf;
1506                }
1507        }
1508
1509        if (ret != HTTP_REAUTH)
1510                return ret;
1511
1512        /*
1513         * If we are using KEEP_ERROR, the previous request may have
1514         * put cruft into our output stream; we should clear it out before
1515         * making our next request. We only know how to do this for
1516         * the strbuf case, but that is enough to satisfy current callers.
1517         */
1518        if (options && options->keep_error) {
1519                switch (target) {
1520                case HTTP_REQUEST_STRBUF:
1521                        strbuf_reset(result);
1522                        break;
1523                default:
1524                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1525                }
1526        }
1527
1528        credential_fill(&http_auth);
1529
1530        return http_request(url, result, target, options);
1531}
1532
1533int http_get_strbuf(const char *url,
1534                    struct strbuf *result,
1535                    struct http_get_options *options)
1536{
1537        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1538}
1539
1540/*
1541 * Downloads a URL and stores the result in the given file.
1542 *
1543 * If a previous interrupted download is detected (i.e. a previous temporary
1544 * file is still around) the download is resumed.
1545 */
1546static int http_get_file(const char *url, const char *filename,
1547                         struct http_get_options *options)
1548{
1549        int ret;
1550        struct strbuf tmpfile = STRBUF_INIT;
1551        FILE *result;
1552
1553        strbuf_addf(&tmpfile, "%s.temp", filename);
1554        result = fopen(tmpfile.buf, "a");
1555        if (!result) {
1556                error("Unable to open local file %s", tmpfile.buf);
1557                ret = HTTP_ERROR;
1558                goto cleanup;
1559        }
1560
1561        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1562        fclose(result);
1563
1564        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1565                ret = HTTP_ERROR;
1566cleanup:
1567        strbuf_release(&tmpfile);
1568        return ret;
1569}
1570
1571int http_fetch_ref(const char *base, struct ref *ref)
1572{
1573        struct http_get_options options = {0};
1574        char *url;
1575        struct strbuf buffer = STRBUF_INIT;
1576        int ret = -1;
1577
1578        options.no_cache = 1;
1579
1580        url = quote_ref_url(base, ref->name);
1581        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1582                strbuf_rtrim(&buffer);
1583                if (buffer.len == 40)
1584                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
1585                else if (starts_with(buffer.buf, "ref: ")) {
1586                        ref->symref = xstrdup(buffer.buf + 5);
1587                        ret = 0;
1588                }
1589        }
1590
1591        strbuf_release(&buffer);
1592        free(url);
1593        return ret;
1594}
1595
1596/* Helpers for fetching packs */
1597static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1598{
1599        char *url, *tmp;
1600        struct strbuf buf = STRBUF_INIT;
1601
1602        if (http_is_verbose)
1603                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1604
1605        end_url_with_slash(&buf, base_url);
1606        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1607        url = strbuf_detach(&buf, NULL);
1608
1609        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1610        tmp = strbuf_detach(&buf, NULL);
1611
1612        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1613                error("Unable to get pack index %s", url);
1614                free(tmp);
1615                tmp = NULL;
1616        }
1617
1618        free(url);
1619        return tmp;
1620}
1621
1622static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1623        unsigned char *sha1, const char *base_url)
1624{
1625        struct packed_git *new_pack;
1626        char *tmp_idx = NULL;
1627        int ret;
1628
1629        if (has_pack_index(sha1)) {
1630                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1631                if (!new_pack)
1632                        return -1; /* parse_pack_index() already issued error message */
1633                goto add_pack;
1634        }
1635
1636        tmp_idx = fetch_pack_index(sha1, base_url);
1637        if (!tmp_idx)
1638                return -1;
1639
1640        new_pack = parse_pack_index(sha1, tmp_idx);
1641        if (!new_pack) {
1642                unlink(tmp_idx);
1643                free(tmp_idx);
1644
1645                return -1; /* parse_pack_index() already issued error message */
1646        }
1647
1648        ret = verify_pack_index(new_pack);
1649        if (!ret) {
1650                close_pack_index(new_pack);
1651                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1652        }
1653        free(tmp_idx);
1654        if (ret)
1655                return -1;
1656
1657add_pack:
1658        new_pack->next = *packs_head;
1659        *packs_head = new_pack;
1660        return 0;
1661}
1662
1663int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1664{
1665        struct http_get_options options = {0};
1666        int ret = 0, i = 0;
1667        char *url, *data;
1668        struct strbuf buf = STRBUF_INIT;
1669        unsigned char sha1[20];
1670
1671        end_url_with_slash(&buf, base_url);
1672        strbuf_addstr(&buf, "objects/info/packs");
1673        url = strbuf_detach(&buf, NULL);
1674
1675        options.no_cache = 1;
1676        ret = http_get_strbuf(url, &buf, &options);
1677        if (ret != HTTP_OK)
1678                goto cleanup;
1679
1680        data = buf.buf;
1681        while (i < buf.len) {
1682                switch (data[i]) {
1683                case 'P':
1684                        i++;
1685                        if (i + 52 <= buf.len &&
1686                            starts_with(data + i, " pack-") &&
1687                            starts_with(data + i + 46, ".pack\n")) {
1688                                get_sha1_hex(data + i + 6, sha1);
1689                                fetch_and_setup_pack_index(packs_head, sha1,
1690                                                      base_url);
1691                                i += 51;
1692                                break;
1693                        }
1694                default:
1695                        while (i < buf.len && data[i] != '\n')
1696                                i++;
1697                }
1698                i++;
1699        }
1700
1701cleanup:
1702        free(url);
1703        return ret;
1704}
1705
1706void release_http_pack_request(struct http_pack_request *preq)
1707{
1708        if (preq->packfile != NULL) {
1709                fclose(preq->packfile);
1710                preq->packfile = NULL;
1711        }
1712        preq->slot = NULL;
1713        free(preq->url);
1714        free(preq);
1715}
1716
1717int finish_http_pack_request(struct http_pack_request *preq)
1718{
1719        struct packed_git **lst;
1720        struct packed_git *p = preq->target;
1721        char *tmp_idx;
1722        size_t len;
1723        struct child_process ip = CHILD_PROCESS_INIT;
1724        const char *ip_argv[8];
1725
1726        close_pack_index(p);
1727
1728        fclose(preq->packfile);
1729        preq->packfile = NULL;
1730
1731        lst = preq->lst;
1732        while (*lst != p)
1733                lst = &((*lst)->next);
1734        *lst = (*lst)->next;
1735
1736        if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1737                die("BUG: pack tmpfile does not end in .pack.temp?");
1738        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1739
1740        ip_argv[0] = "index-pack";
1741        ip_argv[1] = "-o";
1742        ip_argv[2] = tmp_idx;
1743        ip_argv[3] = preq->tmpfile;
1744        ip_argv[4] = NULL;
1745
1746        ip.argv = ip_argv;
1747        ip.git_cmd = 1;
1748        ip.no_stdin = 1;
1749        ip.no_stdout = 1;
1750
1751        if (run_command(&ip)) {
1752                unlink(preq->tmpfile);
1753                unlink(tmp_idx);
1754                free(tmp_idx);
1755                return -1;
1756        }
1757
1758        unlink(sha1_pack_index_name(p->sha1));
1759
1760        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1761         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1762                free(tmp_idx);
1763                return -1;
1764        }
1765
1766        install_packed_git(p);
1767        free(tmp_idx);
1768        return 0;
1769}
1770
1771struct http_pack_request *new_http_pack_request(
1772        struct packed_git *target, const char *base_url)
1773{
1774        off_t prev_posn = 0;
1775        struct strbuf buf = STRBUF_INIT;
1776        struct http_pack_request *preq;
1777
1778        preq = xcalloc(1, sizeof(*preq));
1779        preq->target = target;
1780
1781        end_url_with_slash(&buf, base_url);
1782        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1783                sha1_to_hex(target->sha1));
1784        preq->url = strbuf_detach(&buf, NULL);
1785
1786        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1787                sha1_pack_name(target->sha1));
1788        preq->packfile = fopen(preq->tmpfile, "a");
1789        if (!preq->packfile) {
1790                error("Unable to open local file %s for pack",
1791                      preq->tmpfile);
1792                goto abort;
1793        }
1794
1795        preq->slot = get_active_slot();
1796        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1797        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1798        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1799        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1800                no_pragma_header);
1801
1802        /*
1803         * If there is data present from a previous transfer attempt,
1804         * resume where it left off
1805         */
1806        prev_posn = ftello(preq->packfile);
1807        if (prev_posn>0) {
1808                if (http_is_verbose)
1809                        fprintf(stderr,
1810                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1811                                sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1812                http_opt_request_remainder(preq->slot->curl, prev_posn);
1813        }
1814
1815        return preq;
1816
1817abort:
1818        free(preq->url);
1819        free(preq);
1820        return NULL;
1821}
1822
1823/* Helpers for fetching objects (loose) */
1824static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1825                               void *data)
1826{
1827        unsigned char expn[4096];
1828        size_t size = eltsize * nmemb;
1829        int posn = 0;
1830        struct http_object_request *freq =
1831                (struct http_object_request *)data;
1832        do {
1833                ssize_t retval = xwrite(freq->localfile,
1834                                        (char *) ptr + posn, size - posn);
1835                if (retval < 0)
1836                        return posn;
1837                posn += retval;
1838        } while (posn < size);
1839
1840        freq->stream.avail_in = size;
1841        freq->stream.next_in = (void *)ptr;
1842        do {
1843                freq->stream.next_out = expn;
1844                freq->stream.avail_out = sizeof(expn);
1845                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1846                git_SHA1_Update(&freq->c, expn,
1847                                sizeof(expn) - freq->stream.avail_out);
1848        } while (freq->stream.avail_in && freq->zret == Z_OK);
1849        return size;
1850}
1851
1852struct http_object_request *new_http_object_request(const char *base_url,
1853        unsigned char *sha1)
1854{
1855        char *hex = sha1_to_hex(sha1);
1856        const char *filename;
1857        char prevfile[PATH_MAX];
1858        int prevlocal;
1859        char prev_buf[PREV_BUF_SIZE];
1860        ssize_t prev_read = 0;
1861        off_t prev_posn = 0;
1862        struct http_object_request *freq;
1863
1864        freq = xcalloc(1, sizeof(*freq));
1865        hashcpy(freq->sha1, sha1);
1866        freq->localfile = -1;
1867
1868        filename = sha1_file_name(sha1);
1869        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1870                 "%s.temp", filename);
1871
1872        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1873        unlink_or_warn(prevfile);
1874        rename(freq->tmpfile, prevfile);
1875        unlink_or_warn(freq->tmpfile);
1876
1877        if (freq->localfile != -1)
1878                error("fd leakage in start: %d", freq->localfile);
1879        freq->localfile = open(freq->tmpfile,
1880                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1881        /*
1882         * This could have failed due to the "lazy directory creation";
1883         * try to mkdir the last path component.
1884         */
1885        if (freq->localfile < 0 && errno == ENOENT) {
1886                char *dir = strrchr(freq->tmpfile, '/');
1887                if (dir) {
1888                        *dir = 0;
1889                        mkdir(freq->tmpfile, 0777);
1890                        *dir = '/';
1891                }
1892                freq->localfile = open(freq->tmpfile,
1893                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1894        }
1895
1896        if (freq->localfile < 0) {
1897                error("Couldn't create temporary file %s: %s",
1898                      freq->tmpfile, strerror(errno));
1899                goto abort;
1900        }
1901
1902        git_inflate_init(&freq->stream);
1903
1904        git_SHA1_Init(&freq->c);
1905
1906        freq->url = get_remote_object_url(base_url, hex, 0);
1907
1908        /*
1909         * If a previous temp file is present, process what was already
1910         * fetched.
1911         */
1912        prevlocal = open(prevfile, O_RDONLY);
1913        if (prevlocal != -1) {
1914                do {
1915                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1916                        if (prev_read>0) {
1917                                if (fwrite_sha1_file(prev_buf,
1918                                                     1,
1919                                                     prev_read,
1920                                                     freq) == prev_read) {
1921                                        prev_posn += prev_read;
1922                                } else {
1923                                        prev_read = -1;
1924                                }
1925                        }
1926                } while (prev_read > 0);
1927                close(prevlocal);
1928        }
1929        unlink_or_warn(prevfile);
1930
1931        /*
1932         * Reset inflate/SHA1 if there was an error reading the previous temp
1933         * file; also rewind to the beginning of the local file.
1934         */
1935        if (prev_read == -1) {
1936                memset(&freq->stream, 0, sizeof(freq->stream));
1937                git_inflate_init(&freq->stream);
1938                git_SHA1_Init(&freq->c);
1939                if (prev_posn>0) {
1940                        prev_posn = 0;
1941                        lseek(freq->localfile, 0, SEEK_SET);
1942                        if (ftruncate(freq->localfile, 0) < 0) {
1943                                error("Couldn't truncate temporary file %s: %s",
1944                                          freq->tmpfile, strerror(errno));
1945                                goto abort;
1946                        }
1947                }
1948        }
1949
1950        freq->slot = get_active_slot();
1951
1952        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1953        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1954        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1955        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1956        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1957
1958        /*
1959         * If we have successfully processed data from a previous fetch
1960         * attempt, only fetch the data we don't already have.
1961         */
1962        if (prev_posn>0) {
1963                if (http_is_verbose)
1964                        fprintf(stderr,
1965                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1966                                hex, (uintmax_t)prev_posn);
1967                http_opt_request_remainder(freq->slot->curl, prev_posn);
1968        }
1969
1970        return freq;
1971
1972abort:
1973        free(freq->url);
1974        free(freq);
1975        return NULL;
1976}
1977
1978void process_http_object_request(struct http_object_request *freq)
1979{
1980        if (freq->slot == NULL)
1981                return;
1982        freq->curl_result = freq->slot->curl_result;
1983        freq->http_code = freq->slot->http_code;
1984        freq->slot = NULL;
1985}
1986
1987int finish_http_object_request(struct http_object_request *freq)
1988{
1989        struct stat st;
1990
1991        close(freq->localfile);
1992        freq->localfile = -1;
1993
1994        process_http_object_request(freq);
1995
1996        if (freq->http_code == 416) {
1997                warning("requested range invalid; we may already have all the data.");
1998        } else if (freq->curl_result != CURLE_OK) {
1999                if (stat(freq->tmpfile, &st) == 0)
2000                        if (st.st_size == 0)
2001                                unlink_or_warn(freq->tmpfile);
2002                return -1;
2003        }
2004
2005        git_inflate_end(&freq->stream);
2006        git_SHA1_Final(freq->real_sha1, &freq->c);
2007        if (freq->zret != Z_STREAM_END) {
2008                unlink_or_warn(freq->tmpfile);
2009                return -1;
2010        }
2011        if (hashcmp(freq->sha1, freq->real_sha1)) {
2012                unlink_or_warn(freq->tmpfile);
2013                return -1;
2014        }
2015        freq->rename =
2016                finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2017
2018        return freq->rename;
2019}
2020
2021void abort_http_object_request(struct http_object_request *freq)
2022{
2023        unlink_or_warn(freq->tmpfile);
2024
2025        release_http_object_request(freq);
2026}
2027
2028void release_http_object_request(struct http_object_request *freq)
2029{
2030        if (freq->localfile != -1) {
2031                close(freq->localfile);
2032                freq->localfile = -1;
2033        }
2034        if (freq->url != NULL) {
2035                free(freq->url);
2036                freq->url = NULL;
2037        }
2038        if (freq->slot != NULL) {
2039                freq->slot->callback_func = NULL;
2040                freq->slot->callback_data = NULL;
2041                release_active_slot(freq->slot);
2042                freq->slot = NULL;
2043        }
2044}