Andrew's git / gitweb.git / http.c
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http.con commit Merge branch 'jc/exclusion-doc' (e80aae5)
   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 *http_proxy_authmethod;
  74static struct {
  75        const char *name;
  76        long curlauth_param;
  77} proxy_authmethods[] = {
  78        { "basic", CURLAUTH_BASIC },
  79        { "digest", CURLAUTH_DIGEST },
  80        { "negotiate", CURLAUTH_GSSNEGOTIATE },
  81        { "ntlm", CURLAUTH_NTLM },
  82#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  83        { "anyauth", CURLAUTH_ANY },
  84#endif
  85        /*
  86         * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  87         * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  88         * here, too
  89         */
  90};
  91static struct credential proxy_auth = CREDENTIAL_INIT;
  92static const char *curl_proxyuserpwd;
  93static const char *curl_cookie_file;
  94static int curl_save_cookies;
  95struct credential http_auth = CREDENTIAL_INIT;
  96static int http_proactive_auth;
  97static const char *user_agent;
  98static int curl_empty_auth;
  99
 100#if LIBCURL_VERSION_NUM >= 0x071700
 101/* Use CURLOPT_KEYPASSWD as is */
 102#elif LIBCURL_VERSION_NUM >= 0x070903
 103#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 104#else
 105#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 106#endif
 107
 108static struct credential cert_auth = CREDENTIAL_INIT;
 109static int ssl_cert_password_required;
 110#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 111static unsigned long http_auth_methods = CURLAUTH_ANY;
 112#endif
 113
 114static struct curl_slist *pragma_header;
 115static struct curl_slist *no_pragma_header;
 116
 117static struct active_request_slot *active_queue_head;
 118
 119static char *cached_accept_language;
 120
 121size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 122{
 123        size_t size = eltsize * nmemb;
 124        struct buffer *buffer = buffer_;
 125
 126        if (size > buffer->buf.len - buffer->posn)
 127                size = buffer->buf.len - buffer->posn;
 128        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 129        buffer->posn += size;
 130
 131        return size;
 132}
 133
 134#ifndef NO_CURL_IOCTL
 135curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 136{
 137        struct buffer *buffer = clientp;
 138
 139        switch (cmd) {
 140        case CURLIOCMD_NOP:
 141                return CURLIOE_OK;
 142
 143        case CURLIOCMD_RESTARTREAD:
 144                buffer->posn = 0;
 145                return CURLIOE_OK;
 146
 147        default:
 148                return CURLIOE_UNKNOWNCMD;
 149        }
 150}
 151#endif
 152
 153size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 154{
 155        size_t size = eltsize * nmemb;
 156        struct strbuf *buffer = buffer_;
 157
 158        strbuf_add(buffer, ptr, size);
 159        return size;
 160}
 161
 162size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 163{
 164        return eltsize * nmemb;
 165}
 166
 167static void closedown_active_slot(struct active_request_slot *slot)
 168{
 169        active_requests--;
 170        slot->in_use = 0;
 171}
 172
 173static void finish_active_slot(struct active_request_slot *slot)
 174{
 175        closedown_active_slot(slot);
 176        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 177
 178        if (slot->finished != NULL)
 179                (*slot->finished) = 1;
 180
 181        /* Store slot results so they can be read after the slot is reused */
 182        if (slot->results != NULL) {
 183                slot->results->curl_result = slot->curl_result;
 184                slot->results->http_code = slot->http_code;
 185#if LIBCURL_VERSION_NUM >= 0x070a08
 186                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 187                                  &slot->results->auth_avail);
 188#else
 189                slot->results->auth_avail = 0;
 190#endif
 191
 192                curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 193                        &slot->results->http_connectcode);
 194        }
 195
 196        /* Run callback if appropriate */
 197        if (slot->callback_func != NULL)
 198                slot->callback_func(slot->callback_data);
 199}
 200
 201#ifdef USE_CURL_MULTI
 202static void process_curl_messages(void)
 203{
 204        int num_messages;
 205        struct active_request_slot *slot;
 206        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 207
 208        while (curl_message != NULL) {
 209                if (curl_message->msg == CURLMSG_DONE) {
 210                        int curl_result = curl_message->data.result;
 211                        slot = active_queue_head;
 212                        while (slot != NULL &&
 213                               slot->curl != curl_message->easy_handle)
 214                                slot = slot->next;
 215                        if (slot != NULL) {
 216                                curl_multi_remove_handle(curlm, slot->curl);
 217                                slot->curl_result = curl_result;
 218                                finish_active_slot(slot);
 219                        } else {
 220                                fprintf(stderr, "Received DONE message for unknown request!\n");
 221                        }
 222                } else {
 223                        fprintf(stderr, "Unknown CURL message received: %d\n",
 224                                (int)curl_message->msg);
 225                }
 226                curl_message = curl_multi_info_read(curlm, &num_messages);
 227        }
 228}
 229#endif
 230
 231static int http_options(const char *var, const char *value, void *cb)
 232{
 233        if (!strcmp("http.sslverify", var)) {
 234                curl_ssl_verify = git_config_bool(var, value);
 235                return 0;
 236        }
 237        if (!strcmp("http.sslcipherlist", var))
 238                return git_config_string(&ssl_cipherlist, var, value);
 239        if (!strcmp("http.sslversion", var))
 240                return git_config_string(&ssl_version, var, value);
 241        if (!strcmp("http.sslcert", var))
 242                return git_config_string(&ssl_cert, var, value);
 243#if LIBCURL_VERSION_NUM >= 0x070903
 244        if (!strcmp("http.sslkey", var))
 245                return git_config_string(&ssl_key, var, value);
 246#endif
 247#if LIBCURL_VERSION_NUM >= 0x070908
 248        if (!strcmp("http.sslcapath", var))
 249                return git_config_pathname(&ssl_capath, var, value);
 250#endif
 251        if (!strcmp("http.sslcainfo", var))
 252                return git_config_pathname(&ssl_cainfo, var, value);
 253        if (!strcmp("http.sslcertpasswordprotected", var)) {
 254                ssl_cert_password_required = git_config_bool(var, value);
 255                return 0;
 256        }
 257        if (!strcmp("http.ssltry", var)) {
 258                curl_ssl_try = git_config_bool(var, value);
 259                return 0;
 260        }
 261        if (!strcmp("http.minsessions", var)) {
 262                min_curl_sessions = git_config_int(var, value);
 263#ifndef USE_CURL_MULTI
 264                if (min_curl_sessions > 1)
 265                        min_curl_sessions = 1;
 266#endif
 267                return 0;
 268        }
 269#ifdef USE_CURL_MULTI
 270        if (!strcmp("http.maxrequests", var)) {
 271                max_requests = git_config_int(var, value);
 272                return 0;
 273        }
 274#endif
 275        if (!strcmp("http.lowspeedlimit", var)) {
 276                curl_low_speed_limit = (long)git_config_int(var, value);
 277                return 0;
 278        }
 279        if (!strcmp("http.lowspeedtime", var)) {
 280                curl_low_speed_time = (long)git_config_int(var, value);
 281                return 0;
 282        }
 283
 284        if (!strcmp("http.noepsv", var)) {
 285                curl_ftp_no_epsv = git_config_bool(var, value);
 286                return 0;
 287        }
 288        if (!strcmp("http.proxy", var))
 289                return git_config_string(&curl_http_proxy, var, value);
 290
 291        if (!strcmp("http.proxyauthmethod", var))
 292                return git_config_string(&http_proxy_authmethod, var, value);
 293
 294        if (!strcmp("http.cookiefile", var))
 295                return git_config_string(&curl_cookie_file, var, value);
 296        if (!strcmp("http.savecookies", var)) {
 297                curl_save_cookies = git_config_bool(var, value);
 298                return 0;
 299        }
 300
 301        if (!strcmp("http.postbuffer", var)) {
 302                http_post_buffer = git_config_int(var, value);
 303                if (http_post_buffer < LARGE_PACKET_MAX)
 304                        http_post_buffer = LARGE_PACKET_MAX;
 305                return 0;
 306        }
 307
 308        if (!strcmp("http.useragent", var))
 309                return git_config_string(&user_agent, var, value);
 310
 311        if (!strcmp("http.emptyauth", var)) {
 312                curl_empty_auth = git_config_bool(var, value);
 313                return 0;
 314        }
 315
 316        if (!strcmp("http.pinnedpubkey", var)) {
 317#if LIBCURL_VERSION_NUM >= 0x072c00
 318                return git_config_pathname(&ssl_pinnedkey, var, value);
 319#else
 320                warning(_("Public key pinning not supported with cURL < 7.44.0"));
 321                return 0;
 322#endif
 323        }
 324
 325        /* Fall back on the default ones */
 326        return git_default_config(var, value, cb);
 327}
 328
 329static void init_curl_http_auth(CURL *result)
 330{
 331        if (!http_auth.username) {
 332                if (curl_empty_auth)
 333                        curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 334                return;
 335        }
 336
 337        credential_fill(&http_auth);
 338
 339#if LIBCURL_VERSION_NUM >= 0x071301
 340        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 341        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 342#else
 343        {
 344                static struct strbuf up = STRBUF_INIT;
 345                /*
 346                 * Note that we assume we only ever have a single set of
 347                 * credentials in a given program run, so we do not have
 348                 * to worry about updating this buffer, only setting its
 349                 * initial value.
 350                 */
 351                if (!up.len)
 352                        strbuf_addf(&up, "%s:%s",
 353                                http_auth.username, http_auth.password);
 354                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 355        }
 356#endif
 357}
 358
 359/* *var must be free-able */
 360static void var_override(const char **var, char *value)
 361{
 362        if (value) {
 363                free((void *)*var);
 364                *var = xstrdup(value);
 365        }
 366}
 367
 368static void set_proxyauth_name_password(CURL *result)
 369{
 370#if LIBCURL_VERSION_NUM >= 0x071301
 371                curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 372                        proxy_auth.username);
 373                curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 374                        proxy_auth.password);
 375#else
 376                struct strbuf s = STRBUF_INIT;
 377
 378                strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 379                strbuf_addch(&s, ':');
 380                strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 381                curl_proxyuserpwd = strbuf_detach(&s, NULL);
 382                curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 383#endif
 384}
 385
 386static void init_curl_proxy_auth(CURL *result)
 387{
 388        if (proxy_auth.username) {
 389                if (!proxy_auth.password)
 390                        credential_fill(&proxy_auth);
 391                set_proxyauth_name_password(result);
 392        }
 393
 394        var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 395
 396#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 397        if (http_proxy_authmethod) {
 398                int i;
 399                for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 400                        if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 401                                curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 402                                                proxy_authmethods[i].curlauth_param);
 403                                break;
 404                        }
 405                }
 406                if (i == ARRAY_SIZE(proxy_authmethods)) {
 407                        warning("unsupported proxy authentication method %s: using anyauth",
 408                                        http_proxy_authmethod);
 409                        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 410                }
 411        }
 412        else
 413                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 414#endif
 415}
 416
 417static int has_cert_password(void)
 418{
 419        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 420                return 0;
 421        if (!cert_auth.password) {
 422                cert_auth.protocol = xstrdup("cert");
 423                cert_auth.username = xstrdup("");
 424                cert_auth.path = xstrdup(ssl_cert);
 425                credential_fill(&cert_auth);
 426        }
 427        return 1;
 428}
 429
 430#if LIBCURL_VERSION_NUM >= 0x071900
 431static void set_curl_keepalive(CURL *c)
 432{
 433        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 434}
 435
 436#elif LIBCURL_VERSION_NUM >= 0x071000
 437static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 438{
 439        int ka = 1;
 440        int rc;
 441        socklen_t len = (socklen_t)sizeof(ka);
 442
 443        if (type != CURLSOCKTYPE_IPCXN)
 444                return 0;
 445
 446        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 447        if (rc < 0)
 448                warning("unable to set SO_KEEPALIVE on socket %s",
 449                        strerror(errno));
 450
 451        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 452}
 453
 454static void set_curl_keepalive(CURL *c)
 455{
 456        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 457}
 458
 459#else
 460static void set_curl_keepalive(CURL *c)
 461{
 462        /* not supported on older curl versions */
 463}
 464#endif
 465
 466static CURL *get_curl_handle(void)
 467{
 468        CURL *result = curl_easy_init();
 469        long allowed_protocols = 0;
 470
 471        if (!result)
 472                die("curl_easy_init failed");
 473
 474        if (!curl_ssl_verify) {
 475                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 476                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 477        } else {
 478                /* Verify authenticity of the peer's certificate */
 479                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 480                /* The name in the cert must match whom we tried to connect */
 481                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 482        }
 483
 484#if LIBCURL_VERSION_NUM >= 0x070907
 485        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 486#endif
 487#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 488        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 489#endif
 490
 491        if (http_proactive_auth)
 492                init_curl_http_auth(result);
 493
 494        if (getenv("GIT_SSL_VERSION"))
 495                ssl_version = getenv("GIT_SSL_VERSION");
 496        if (ssl_version && *ssl_version) {
 497                int i;
 498                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 499                        if (!strcmp(ssl_version, sslversions[i].name)) {
 500                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 501                                                 sslversions[i].ssl_version);
 502                                break;
 503                        }
 504                }
 505                if (i == ARRAY_SIZE(sslversions))
 506                        warning("unsupported ssl version %s: using default",
 507                                ssl_version);
 508        }
 509
 510        if (getenv("GIT_SSL_CIPHER_LIST"))
 511                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 512        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 513                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 514                                ssl_cipherlist);
 515
 516        if (ssl_cert != NULL)
 517                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 518        if (has_cert_password())
 519                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 520#if LIBCURL_VERSION_NUM >= 0x070903
 521        if (ssl_key != NULL)
 522                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 523#endif
 524#if LIBCURL_VERSION_NUM >= 0x070908
 525        if (ssl_capath != NULL)
 526                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 527#endif
 528#if LIBCURL_VERSION_NUM >= 0x072c00
 529        if (ssl_pinnedkey != NULL)
 530                curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 531#endif
 532        if (ssl_cainfo != NULL)
 533                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 534
 535        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 536                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 537                                 curl_low_speed_limit);
 538                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 539                                 curl_low_speed_time);
 540        }
 541
 542        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 543        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 544#if LIBCURL_VERSION_NUM >= 0x071301
 545        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 546#elif LIBCURL_VERSION_NUM >= 0x071101
 547        curl_easy_setopt(result, CURLOPT_POST301, 1);
 548#endif
 549#if LIBCURL_VERSION_NUM >= 0x071304
 550        if (is_transport_allowed("http"))
 551                allowed_protocols |= CURLPROTO_HTTP;
 552        if (is_transport_allowed("https"))
 553                allowed_protocols |= CURLPROTO_HTTPS;
 554        if (is_transport_allowed("ftp"))
 555                allowed_protocols |= CURLPROTO_FTP;
 556        if (is_transport_allowed("ftps"))
 557                allowed_protocols |= CURLPROTO_FTPS;
 558        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 559#else
 560        if (transport_restrict_protocols())
 561                warning("protocol restrictions not applied to curl redirects because\n"
 562                        "your curl version is too old (>= 7.19.4)");
 563#endif
 564
 565        if (getenv("GIT_CURL_VERBOSE"))
 566                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 567
 568        curl_easy_setopt(result, CURLOPT_USERAGENT,
 569                user_agent ? user_agent : git_user_agent());
 570
 571        if (curl_ftp_no_epsv)
 572                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 573
 574#ifdef CURLOPT_USE_SSL
 575        if (curl_ssl_try)
 576                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 577#endif
 578
 579        /*
 580         * CURL also examines these variables as a fallback; but we need to query
 581         * them here in order to decide whether to prompt for missing password (cf.
 582         * init_curl_proxy_auth()).
 583         *
 584         * Unlike many other common environment variables, these are historically
 585         * lowercase only. It appears that CURL did not know this and implemented
 586         * only uppercase variants, which was later corrected to take both - with
 587         * the exception of http_proxy, which is lowercase only also in CURL. As
 588         * the lowercase versions are the historical quasi-standard, they take
 589         * precedence here, as in CURL.
 590         */
 591        if (!curl_http_proxy) {
 592                if (!strcmp(http_auth.protocol, "https")) {
 593                        var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 594                        var_override(&curl_http_proxy, getenv("https_proxy"));
 595                } else {
 596                        var_override(&curl_http_proxy, getenv("http_proxy"));
 597                }
 598                if (!curl_http_proxy) {
 599                        var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 600                        var_override(&curl_http_proxy, getenv("all_proxy"));
 601                }
 602        }
 603
 604        if (curl_http_proxy) {
 605                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 606#if LIBCURL_VERSION_NUM >= 0x071800
 607                if (starts_with(curl_http_proxy, "socks5"))
 608                        curl_easy_setopt(result,
 609                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 610                else if (starts_with(curl_http_proxy, "socks4a"))
 611                        curl_easy_setopt(result,
 612                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 613                else if (starts_with(curl_http_proxy, "socks"))
 614                        curl_easy_setopt(result,
 615                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 616#endif
 617                if (strstr(curl_http_proxy, "://"))
 618                        credential_from_url(&proxy_auth, curl_http_proxy);
 619                else {
 620                        struct strbuf url = STRBUF_INIT;
 621                        strbuf_addf(&url, "http://%s", curl_http_proxy);
 622                        credential_from_url(&proxy_auth, url.buf);
 623                        strbuf_release(&url);
 624                }
 625
 626                curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 627        }
 628        init_curl_proxy_auth(result);
 629
 630        set_curl_keepalive(result);
 631
 632        return result;
 633}
 634
 635static void set_from_env(const char **var, const char *envname)
 636{
 637        const char *val = getenv(envname);
 638        if (val)
 639                *var = val;
 640}
 641
 642void http_init(struct remote *remote, const char *url, int proactive_auth)
 643{
 644        char *low_speed_limit;
 645        char *low_speed_time;
 646        char *normalized_url;
 647        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 648
 649        config.section = "http";
 650        config.key = NULL;
 651        config.collect_fn = http_options;
 652        config.cascade_fn = git_default_config;
 653        config.cb = NULL;
 654
 655        http_is_verbose = 0;
 656        normalized_url = url_normalize(url, &config.url);
 657
 658        git_config(urlmatch_config_entry, &config);
 659        free(normalized_url);
 660
 661        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 662                die("curl_global_init failed");
 663
 664        http_proactive_auth = proactive_auth;
 665
 666        if (remote && remote->http_proxy)
 667                curl_http_proxy = xstrdup(remote->http_proxy);
 668
 669        if (remote)
 670                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 671
 672        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 673        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 674
 675#ifdef USE_CURL_MULTI
 676        {
 677                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 678                if (http_max_requests != NULL)
 679                        max_requests = atoi(http_max_requests);
 680        }
 681
 682        curlm = curl_multi_init();
 683        if (!curlm)
 684                die("curl_multi_init failed");
 685#endif
 686
 687        if (getenv("GIT_SSL_NO_VERIFY"))
 688                curl_ssl_verify = 0;
 689
 690        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 691#if LIBCURL_VERSION_NUM >= 0x070903
 692        set_from_env(&ssl_key, "GIT_SSL_KEY");
 693#endif
 694#if LIBCURL_VERSION_NUM >= 0x070908
 695        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 696#endif
 697        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 698
 699        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 700
 701        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 702        if (low_speed_limit != NULL)
 703                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 704        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 705        if (low_speed_time != NULL)
 706                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 707
 708        if (curl_ssl_verify == -1)
 709                curl_ssl_verify = 1;
 710
 711        curl_session_count = 0;
 712#ifdef USE_CURL_MULTI
 713        if (max_requests < 1)
 714                max_requests = DEFAULT_MAX_REQUESTS;
 715#endif
 716
 717        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 718                curl_ftp_no_epsv = 1;
 719
 720        if (url) {
 721                credential_from_url(&http_auth, url);
 722                if (!ssl_cert_password_required &&
 723                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 724                    starts_with(url, "https://"))
 725                        ssl_cert_password_required = 1;
 726        }
 727
 728#ifndef NO_CURL_EASY_DUPHANDLE
 729        curl_default = get_curl_handle();
 730#endif
 731}
 732
 733void http_cleanup(void)
 734{
 735        struct active_request_slot *slot = active_queue_head;
 736
 737        while (slot != NULL) {
 738                struct active_request_slot *next = slot->next;
 739                if (slot->curl != NULL) {
 740#ifdef USE_CURL_MULTI
 741                        curl_multi_remove_handle(curlm, slot->curl);
 742#endif
 743                        curl_easy_cleanup(slot->curl);
 744                }
 745                free(slot);
 746                slot = next;
 747        }
 748        active_queue_head = NULL;
 749
 750#ifndef NO_CURL_EASY_DUPHANDLE
 751        curl_easy_cleanup(curl_default);
 752#endif
 753
 754#ifdef USE_CURL_MULTI
 755        curl_multi_cleanup(curlm);
 756#endif
 757        curl_global_cleanup();
 758
 759        curl_slist_free_all(pragma_header);
 760        pragma_header = NULL;
 761
 762        curl_slist_free_all(no_pragma_header);
 763        no_pragma_header = NULL;
 764
 765        if (curl_http_proxy) {
 766                free((void *)curl_http_proxy);
 767                curl_http_proxy = NULL;
 768        }
 769
 770        if (proxy_auth.password) {
 771                memset(proxy_auth.password, 0, strlen(proxy_auth.password));
 772                free(proxy_auth.password);
 773                proxy_auth.password = NULL;
 774        }
 775
 776        free((void *)curl_proxyuserpwd);
 777        curl_proxyuserpwd = NULL;
 778
 779        free((void *)http_proxy_authmethod);
 780        http_proxy_authmethod = NULL;
 781
 782        if (cert_auth.password != NULL) {
 783                memset(cert_auth.password, 0, strlen(cert_auth.password));
 784                free(cert_auth.password);
 785                cert_auth.password = NULL;
 786        }
 787        ssl_cert_password_required = 0;
 788
 789        free(cached_accept_language);
 790        cached_accept_language = NULL;
 791}
 792
 793struct active_request_slot *get_active_slot(void)
 794{
 795        struct active_request_slot *slot = active_queue_head;
 796        struct active_request_slot *newslot;
 797
 798#ifdef USE_CURL_MULTI
 799        int num_transfers;
 800
 801        /* Wait for a slot to open up if the queue is full */
 802        while (active_requests >= max_requests) {
 803                curl_multi_perform(curlm, &num_transfers);
 804                if (num_transfers < active_requests)
 805                        process_curl_messages();
 806        }
 807#endif
 808
 809        while (slot != NULL && slot->in_use)
 810                slot = slot->next;
 811
 812        if (slot == NULL) {
 813                newslot = xmalloc(sizeof(*newslot));
 814                newslot->curl = NULL;
 815                newslot->in_use = 0;
 816                newslot->next = NULL;
 817
 818                slot = active_queue_head;
 819                if (slot == NULL) {
 820                        active_queue_head = newslot;
 821                } else {
 822                        while (slot->next != NULL)
 823                                slot = slot->next;
 824                        slot->next = newslot;
 825                }
 826                slot = newslot;
 827        }
 828
 829        if (slot->curl == NULL) {
 830#ifdef NO_CURL_EASY_DUPHANDLE
 831                slot->curl = get_curl_handle();
 832#else
 833                slot->curl = curl_easy_duphandle(curl_default);
 834#endif
 835                curl_session_count++;
 836        }
 837
 838        active_requests++;
 839        slot->in_use = 1;
 840        slot->results = NULL;
 841        slot->finished = NULL;
 842        slot->callback_data = NULL;
 843        slot->callback_func = NULL;
 844        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 845        if (curl_save_cookies)
 846                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 847        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 848        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 849        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 850        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 851        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 852        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 853        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 854        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 855        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 856        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
 857
 858#if LIBCURL_VERSION_NUM >= 0x070a08
 859        curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
 860#endif
 861#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 862        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 863#endif
 864        if (http_auth.password || curl_empty_auth)
 865                init_curl_http_auth(slot->curl);
 866
 867        return slot;
 868}
 869
 870int start_active_slot(struct active_request_slot *slot)
 871{
 872#ifdef USE_CURL_MULTI
 873        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 874        int num_transfers;
 875
 876        if (curlm_result != CURLM_OK &&
 877            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 878                active_requests--;
 879                slot->in_use = 0;
 880                return 0;
 881        }
 882
 883        /*
 884         * We know there must be something to do, since we just added
 885         * something.
 886         */
 887        curl_multi_perform(curlm, &num_transfers);
 888#endif
 889        return 1;
 890}
 891
 892#ifdef USE_CURL_MULTI
 893struct fill_chain {
 894        void *data;
 895        int (*fill)(void *);
 896        struct fill_chain *next;
 897};
 898
 899static struct fill_chain *fill_cfg;
 900
 901void add_fill_function(void *data, int (*fill)(void *))
 902{
 903        struct fill_chain *new = xmalloc(sizeof(*new));
 904        struct fill_chain **linkp = &fill_cfg;
 905        new->data = data;
 906        new->fill = fill;
 907        new->next = NULL;
 908        while (*linkp)
 909                linkp = &(*linkp)->next;
 910        *linkp = new;
 911}
 912
 913void fill_active_slots(void)
 914{
 915        struct active_request_slot *slot = active_queue_head;
 916
 917        while (active_requests < max_requests) {
 918                struct fill_chain *fill;
 919                for (fill = fill_cfg; fill; fill = fill->next)
 920                        if (fill->fill(fill->data))
 921                                break;
 922
 923                if (!fill)
 924                        break;
 925        }
 926
 927        while (slot != NULL) {
 928                if (!slot->in_use && slot->curl != NULL
 929                        && curl_session_count > min_curl_sessions) {
 930                        curl_easy_cleanup(slot->curl);
 931                        slot->curl = NULL;
 932                        curl_session_count--;
 933                }
 934                slot = slot->next;
 935        }
 936}
 937
 938void step_active_slots(void)
 939{
 940        int num_transfers;
 941        CURLMcode curlm_result;
 942
 943        do {
 944                curlm_result = curl_multi_perform(curlm, &num_transfers);
 945        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 946        if (num_transfers < active_requests) {
 947                process_curl_messages();
 948                fill_active_slots();
 949        }
 950}
 951#endif
 952
 953void run_active_slot(struct active_request_slot *slot)
 954{
 955#ifdef USE_CURL_MULTI
 956        fd_set readfds;
 957        fd_set writefds;
 958        fd_set excfds;
 959        int max_fd;
 960        struct timeval select_timeout;
 961        int finished = 0;
 962
 963        slot->finished = &finished;
 964        while (!finished) {
 965                step_active_slots();
 966
 967                if (slot->in_use) {
 968#if LIBCURL_VERSION_NUM >= 0x070f04
 969                        long curl_timeout;
 970                        curl_multi_timeout(curlm, &curl_timeout);
 971                        if (curl_timeout == 0) {
 972                                continue;
 973                        } else if (curl_timeout == -1) {
 974                                select_timeout.tv_sec  = 0;
 975                                select_timeout.tv_usec = 50000;
 976                        } else {
 977                                select_timeout.tv_sec  =  curl_timeout / 1000;
 978                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 979                        }
 980#else
 981                        select_timeout.tv_sec  = 0;
 982                        select_timeout.tv_usec = 50000;
 983#endif
 984
 985                        max_fd = -1;
 986                        FD_ZERO(&readfds);
 987                        FD_ZERO(&writefds);
 988                        FD_ZERO(&excfds);
 989                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 990
 991                        /*
 992                         * It can happen that curl_multi_timeout returns a pathologically
 993                         * long timeout when curl_multi_fdset returns no file descriptors
 994                         * to read.  See commit message for more details.
 995                         */
 996                        if (max_fd < 0 &&
 997                            (select_timeout.tv_sec > 0 ||
 998                             select_timeout.tv_usec > 50000)) {
 999                                select_timeout.tv_sec  = 0;
1000                                select_timeout.tv_usec = 50000;
1001                        }
1002
1003                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1004                }
1005        }
1006#else
1007        while (slot->in_use) {
1008                slot->curl_result = curl_easy_perform(slot->curl);
1009                finish_active_slot(slot);
1010        }
1011#endif
1012}
1013
1014static void release_active_slot(struct active_request_slot *slot)
1015{
1016        closedown_active_slot(slot);
1017        if (slot->curl && curl_session_count > min_curl_sessions) {
1018#ifdef USE_CURL_MULTI
1019                curl_multi_remove_handle(curlm, slot->curl);
1020#endif
1021                curl_easy_cleanup(slot->curl);
1022                slot->curl = NULL;
1023                curl_session_count--;
1024        }
1025#ifdef USE_CURL_MULTI
1026        fill_active_slots();
1027#endif
1028}
1029
1030void finish_all_active_slots(void)
1031{
1032        struct active_request_slot *slot = active_queue_head;
1033
1034        while (slot != NULL)
1035                if (slot->in_use) {
1036                        run_active_slot(slot);
1037                        slot = active_queue_head;
1038                } else {
1039                        slot = slot->next;
1040                }
1041}
1042
1043/* Helpers for modifying and creating URLs */
1044static inline int needs_quote(int ch)
1045{
1046        if (((ch >= 'A') && (ch <= 'Z'))
1047                        || ((ch >= 'a') && (ch <= 'z'))
1048                        || ((ch >= '0') && (ch <= '9'))
1049                        || (ch == '/')
1050                        || (ch == '-')
1051                        || (ch == '.'))
1052                return 0;
1053        return 1;
1054}
1055
1056static char *quote_ref_url(const char *base, const char *ref)
1057{
1058        struct strbuf buf = STRBUF_INIT;
1059        const char *cp;
1060        int ch;
1061
1062        end_url_with_slash(&buf, base);
1063
1064        for (cp = ref; (ch = *cp) != 0; cp++)
1065                if (needs_quote(ch))
1066                        strbuf_addf(&buf, "%%%02x", ch);
1067                else
1068                        strbuf_addch(&buf, *cp);
1069
1070        return strbuf_detach(&buf, NULL);
1071}
1072
1073void append_remote_object_url(struct strbuf *buf, const char *url,
1074                              const char *hex,
1075                              int only_two_digit_prefix)
1076{
1077        end_url_with_slash(buf, url);
1078
1079        strbuf_addf(buf, "objects/%.*s/", 2, hex);
1080        if (!only_two_digit_prefix)
1081                strbuf_addf(buf, "%s", hex+2);
1082}
1083
1084char *get_remote_object_url(const char *url, const char *hex,
1085                            int only_two_digit_prefix)
1086{
1087        struct strbuf buf = STRBUF_INIT;
1088        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1089        return strbuf_detach(&buf, NULL);
1090}
1091
1092static int handle_curl_result(struct slot_results *results)
1093{
1094        /*
1095         * If we see a failing http code with CURLE_OK, we have turned off
1096         * FAILONERROR (to keep the server's custom error response), and should
1097         * translate the code into failure here.
1098         */
1099        if (results->curl_result == CURLE_OK &&
1100            results->http_code >= 400) {
1101                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1102                /*
1103                 * Normally curl will already have put the "reason phrase"
1104                 * from the server into curl_errorstr; unfortunately without
1105                 * FAILONERROR it is lost, so we can give only the numeric
1106                 * status code.
1107                 */
1108                snprintf(curl_errorstr, sizeof(curl_errorstr),
1109                         "The requested URL returned error: %ld",
1110                         results->http_code);
1111        }
1112
1113        if (results->curl_result == CURLE_OK) {
1114                credential_approve(&http_auth);
1115                if (proxy_auth.password)
1116                        credential_approve(&proxy_auth);
1117                return HTTP_OK;
1118        } else if (missing_target(results))
1119                return HTTP_MISSING_TARGET;
1120        else if (results->http_code == 401) {
1121                if (http_auth.username && http_auth.password) {
1122                        credential_reject(&http_auth);
1123                        return HTTP_NOAUTH;
1124                } else {
1125#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1126                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1127#endif
1128                        return HTTP_REAUTH;
1129                }
1130        } else {
1131                if (results->http_connectcode == 407)
1132                        credential_reject(&proxy_auth);
1133#if LIBCURL_VERSION_NUM >= 0x070c00
1134                if (!curl_errorstr[0])
1135                        strlcpy(curl_errorstr,
1136                                curl_easy_strerror(results->curl_result),
1137                                sizeof(curl_errorstr));
1138#endif
1139                return HTTP_ERROR;
1140        }
1141}
1142
1143int run_one_slot(struct active_request_slot *slot,
1144                 struct slot_results *results)
1145{
1146        slot->results = results;
1147        if (!start_active_slot(slot)) {
1148                snprintf(curl_errorstr, sizeof(curl_errorstr),
1149                         "failed to start HTTP request");
1150                return HTTP_START_FAILED;
1151        }
1152
1153        run_active_slot(slot);
1154        return handle_curl_result(results);
1155}
1156
1157static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1158{
1159        char *ptr;
1160        CURLcode ret;
1161
1162        strbuf_reset(buf);
1163        ret = curl_easy_getinfo(curl, info, &ptr);
1164        if (!ret && ptr)
1165                strbuf_addstr(buf, ptr);
1166        return ret;
1167}
1168
1169/*
1170 * Check for and extract a content-type parameter. "raw"
1171 * should be positioned at the start of the potential
1172 * parameter, with any whitespace already removed.
1173 *
1174 * "name" is the name of the parameter. The value is appended
1175 * to "out".
1176 */
1177static int extract_param(const char *raw, const char *name,
1178                         struct strbuf *out)
1179{
1180        size_t len = strlen(name);
1181
1182        if (strncasecmp(raw, name, len))
1183                return -1;
1184        raw += len;
1185
1186        if (*raw != '=')
1187                return -1;
1188        raw++;
1189
1190        while (*raw && !isspace(*raw) && *raw != ';')
1191                strbuf_addch(out, *raw++);
1192        return 0;
1193}
1194
1195/*
1196 * Extract a normalized version of the content type, with any
1197 * spaces suppressed, all letters lowercased, and no trailing ";"
1198 * or parameters.
1199 *
1200 * Note that we will silently remove even invalid whitespace. For
1201 * example, "text / plain" is specifically forbidden by RFC 2616,
1202 * but "text/plain" is the only reasonable output, and this keeps
1203 * our code simple.
1204 *
1205 * If the "charset" argument is not NULL, store the value of any
1206 * charset parameter there.
1207 *
1208 * Example:
1209 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1210 *   "text / plain" -> "text/plain"
1211 */
1212static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1213                                 struct strbuf *charset)
1214{
1215        const char *p;
1216
1217        strbuf_reset(type);
1218        strbuf_grow(type, raw->len);
1219        for (p = raw->buf; *p; p++) {
1220                if (isspace(*p))
1221                        continue;
1222                if (*p == ';') {
1223                        p++;
1224                        break;
1225                }
1226                strbuf_addch(type, tolower(*p));
1227        }
1228
1229        if (!charset)
1230                return;
1231
1232        strbuf_reset(charset);
1233        while (*p) {
1234                while (isspace(*p) || *p == ';')
1235                        p++;
1236                if (!extract_param(p, "charset", charset))
1237                        return;
1238                while (*p && !isspace(*p))
1239                        p++;
1240        }
1241
1242        if (!charset->len && starts_with(type->buf, "text/"))
1243                strbuf_addstr(charset, "ISO-8859-1");
1244}
1245
1246static void write_accept_language(struct strbuf *buf)
1247{
1248        /*
1249         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1250         * that, q-value will be smaller than 0.001, the minimum q-value the
1251         * HTTP specification allows. See
1252         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1253         */
1254        const int MAX_DECIMAL_PLACES = 3;
1255        const int MAX_LANGUAGE_TAGS = 1000;
1256        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1257        char **language_tags = NULL;
1258        int num_langs = 0;
1259        const char *s = get_preferred_languages();
1260        int i;
1261        struct strbuf tag = STRBUF_INIT;
1262
1263        /* Don't add Accept-Language header if no language is preferred. */
1264        if (!s)
1265                return;
1266
1267        /*
1268         * Split the colon-separated string of preferred languages into
1269         * language_tags array.
1270         */
1271        do {
1272                /* collect language tag */
1273                for (; *s && (isalnum(*s) || *s == '_'); s++)
1274                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1275
1276                /* skip .codeset, @modifier and any other unnecessary parts */
1277                while (*s && *s != ':')
1278                        s++;
1279
1280                if (tag.len) {
1281                        num_langs++;
1282                        REALLOC_ARRAY(language_tags, num_langs);
1283                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1284                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1285                                break;
1286                }
1287        } while (*s++);
1288
1289        /* write Accept-Language header into buf */
1290        if (num_langs) {
1291                int last_buf_len = 0;
1292                int max_q;
1293                int decimal_places;
1294                char q_format[32];
1295
1296                /* add '*' */
1297                REALLOC_ARRAY(language_tags, num_langs + 1);
1298                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1299
1300                /* compute decimal_places */
1301                for (max_q = 1, decimal_places = 0;
1302                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1303                     decimal_places++, max_q *= 10)
1304                        ;
1305
1306                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1307
1308                strbuf_addstr(buf, "Accept-Language: ");
1309
1310                for (i = 0; i < num_langs; i++) {
1311                        if (i > 0)
1312                                strbuf_addstr(buf, ", ");
1313
1314                        strbuf_addstr(buf, language_tags[i]);
1315
1316                        if (i > 0)
1317                                strbuf_addf(buf, q_format, max_q - i);
1318
1319                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1320                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1321                                break;
1322                        }
1323
1324                        last_buf_len = buf->len;
1325                }
1326        }
1327
1328        /* free language tags -- last one is a static '*' */
1329        for (i = 0; i < num_langs - 1; i++)
1330                free(language_tags[i]);
1331        free(language_tags);
1332}
1333
1334/*
1335 * Get an Accept-Language header which indicates user's preferred languages.
1336 *
1337 * Examples:
1338 *   LANGUAGE= -> ""
1339 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1340 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1341 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1342 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1343 *   LANGUAGE= LANG=C -> ""
1344 */
1345static const char *get_accept_language(void)
1346{
1347        if (!cached_accept_language) {
1348                struct strbuf buf = STRBUF_INIT;
1349                write_accept_language(&buf);
1350                if (buf.len > 0)
1351                        cached_accept_language = strbuf_detach(&buf, NULL);
1352        }
1353
1354        return cached_accept_language;
1355}
1356
1357static void http_opt_request_remainder(CURL *curl, off_t pos)
1358{
1359        char buf[128];
1360        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1361        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1362}
1363
1364/* http_request() targets */
1365#define HTTP_REQUEST_STRBUF     0
1366#define HTTP_REQUEST_FILE       1
1367
1368static int http_request(const char *url,
1369                        void *result, int target,
1370                        const struct http_get_options *options)
1371{
1372        struct active_request_slot *slot;
1373        struct slot_results results;
1374        struct curl_slist *headers = NULL;
1375        struct strbuf buf = STRBUF_INIT;
1376        const char *accept_language;
1377        int ret;
1378
1379        slot = get_active_slot();
1380        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1381
1382        if (result == NULL) {
1383                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1384        } else {
1385                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1386                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1387
1388                if (target == HTTP_REQUEST_FILE) {
1389                        off_t posn = ftello(result);
1390                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1391                                         fwrite);
1392                        if (posn > 0)
1393                                http_opt_request_remainder(slot->curl, posn);
1394                } else
1395                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1396                                         fwrite_buffer);
1397        }
1398
1399        accept_language = get_accept_language();
1400
1401        if (accept_language)
1402                headers = curl_slist_append(headers, accept_language);
1403
1404        strbuf_addstr(&buf, "Pragma:");
1405        if (options && options->no_cache)
1406                strbuf_addstr(&buf, " no-cache");
1407        if (options && options->keep_error)
1408                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1409
1410        headers = curl_slist_append(headers, buf.buf);
1411
1412        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1413        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1414        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1415
1416        ret = run_one_slot(slot, &results);
1417
1418        if (options && options->content_type) {
1419                struct strbuf raw = STRBUF_INIT;
1420                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1421                extract_content_type(&raw, options->content_type,
1422                                     options->charset);
1423                strbuf_release(&raw);
1424        }
1425
1426        if (options && options->effective_url)
1427                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1428                                options->effective_url);
1429
1430        curl_slist_free_all(headers);
1431        strbuf_release(&buf);
1432
1433        return ret;
1434}
1435
1436/*
1437 * Update the "base" url to a more appropriate value, as deduced by
1438 * redirects seen when requesting a URL starting with "url".
1439 *
1440 * The "asked" parameter is a URL that we asked curl to access, and must begin
1441 * with "base".
1442 *
1443 * The "got" parameter is the URL that curl reported to us as where we ended
1444 * up.
1445 *
1446 * Returns 1 if we updated the base url, 0 otherwise.
1447 *
1448 * Our basic strategy is to compare "base" and "asked" to find the bits
1449 * specific to our request. We then strip those bits off of "got" to yield the
1450 * new base. So for example, if our base is "http://example.com/foo.git",
1451 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1452 * with "https://other.example.com/foo.git/info/refs". We would want the
1453 * new URL to become "https://other.example.com/foo.git".
1454 *
1455 * Note that this assumes a sane redirect scheme. It's entirely possible
1456 * in the example above to end up at a URL that does not even end in
1457 * "info/refs".  In such a case we simply punt, as there is not much we can
1458 * do (and such a scheme is unlikely to represent a real git repository,
1459 * which means we are likely about to abort anyway).
1460 */
1461static int update_url_from_redirect(struct strbuf *base,
1462                                    const char *asked,
1463                                    const struct strbuf *got)
1464{
1465        const char *tail;
1466        size_t tail_len;
1467
1468        if (!strcmp(asked, got->buf))
1469                return 0;
1470
1471        if (!skip_prefix(asked, base->buf, &tail))
1472                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1473                    asked, base->buf);
1474
1475        tail_len = strlen(tail);
1476
1477        if (got->len < tail_len ||
1478            strcmp(tail, got->buf + got->len - tail_len))
1479                return 0; /* insane redirect scheme */
1480
1481        strbuf_reset(base);
1482        strbuf_add(base, got->buf, got->len - tail_len);
1483        return 1;
1484}
1485
1486static int http_request_reauth(const char *url,
1487                               void *result, int target,
1488                               struct http_get_options *options)
1489{
1490        int ret = http_request(url, result, target, options);
1491
1492        if (options && options->effective_url && options->base_url) {
1493                if (update_url_from_redirect(options->base_url,
1494                                             url, options->effective_url)) {
1495                        credential_from_url(&http_auth, options->base_url->buf);
1496                        url = options->effective_url->buf;
1497                }
1498        }
1499
1500        if (ret != HTTP_REAUTH)
1501                return ret;
1502
1503        /*
1504         * If we are using KEEP_ERROR, the previous request may have
1505         * put cruft into our output stream; we should clear it out before
1506         * making our next request. We only know how to do this for
1507         * the strbuf case, but that is enough to satisfy current callers.
1508         */
1509        if (options && options->keep_error) {
1510                switch (target) {
1511                case HTTP_REQUEST_STRBUF:
1512                        strbuf_reset(result);
1513                        break;
1514                default:
1515                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1516                }
1517        }
1518
1519        credential_fill(&http_auth);
1520
1521        return http_request(url, result, target, options);
1522}
1523
1524int http_get_strbuf(const char *url,
1525                    struct strbuf *result,
1526                    struct http_get_options *options)
1527{
1528        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1529}
1530
1531/*
1532 * Downloads a URL and stores the result in the given file.
1533 *
1534 * If a previous interrupted download is detected (i.e. a previous temporary
1535 * file is still around) the download is resumed.
1536 */
1537static int http_get_file(const char *url, const char *filename,
1538                         struct http_get_options *options)
1539{
1540        int ret;
1541        struct strbuf tmpfile = STRBUF_INIT;
1542        FILE *result;
1543
1544        strbuf_addf(&tmpfile, "%s.temp", filename);
1545        result = fopen(tmpfile.buf, "a");
1546        if (!result) {
1547                error("Unable to open local file %s", tmpfile.buf);
1548                ret = HTTP_ERROR;
1549                goto cleanup;
1550        }
1551
1552        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1553        fclose(result);
1554
1555        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1556                ret = HTTP_ERROR;
1557cleanup:
1558        strbuf_release(&tmpfile);
1559        return ret;
1560}
1561
1562int http_fetch_ref(const char *base, struct ref *ref)
1563{
1564        struct http_get_options options = {0};
1565        char *url;
1566        struct strbuf buffer = STRBUF_INIT;
1567        int ret = -1;
1568
1569        options.no_cache = 1;
1570
1571        url = quote_ref_url(base, ref->name);
1572        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1573                strbuf_rtrim(&buffer);
1574                if (buffer.len == 40)
1575                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
1576                else if (starts_with(buffer.buf, "ref: ")) {
1577                        ref->symref = xstrdup(buffer.buf + 5);
1578                        ret = 0;
1579                }
1580        }
1581
1582        strbuf_release(&buffer);
1583        free(url);
1584        return ret;
1585}
1586
1587/* Helpers for fetching packs */
1588static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1589{
1590        char *url, *tmp;
1591        struct strbuf buf = STRBUF_INIT;
1592
1593        if (http_is_verbose)
1594                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1595
1596        end_url_with_slash(&buf, base_url);
1597        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1598        url = strbuf_detach(&buf, NULL);
1599
1600        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1601        tmp = strbuf_detach(&buf, NULL);
1602
1603        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1604                error("Unable to get pack index %s", url);
1605                free(tmp);
1606                tmp = NULL;
1607        }
1608
1609        free(url);
1610        return tmp;
1611}
1612
1613static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1614        unsigned char *sha1, const char *base_url)
1615{
1616        struct packed_git *new_pack;
1617        char *tmp_idx = NULL;
1618        int ret;
1619
1620        if (has_pack_index(sha1)) {
1621                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1622                if (!new_pack)
1623                        return -1; /* parse_pack_index() already issued error message */
1624                goto add_pack;
1625        }
1626
1627        tmp_idx = fetch_pack_index(sha1, base_url);
1628        if (!tmp_idx)
1629                return -1;
1630
1631        new_pack = parse_pack_index(sha1, tmp_idx);
1632        if (!new_pack) {
1633                unlink(tmp_idx);
1634                free(tmp_idx);
1635
1636                return -1; /* parse_pack_index() already issued error message */
1637        }
1638
1639        ret = verify_pack_index(new_pack);
1640        if (!ret) {
1641                close_pack_index(new_pack);
1642                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1643        }
1644        free(tmp_idx);
1645        if (ret)
1646                return -1;
1647
1648add_pack:
1649        new_pack->next = *packs_head;
1650        *packs_head = new_pack;
1651        return 0;
1652}
1653
1654int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1655{
1656        struct http_get_options options = {0};
1657        int ret = 0, i = 0;
1658        char *url, *data;
1659        struct strbuf buf = STRBUF_INIT;
1660        unsigned char sha1[20];
1661
1662        end_url_with_slash(&buf, base_url);
1663        strbuf_addstr(&buf, "objects/info/packs");
1664        url = strbuf_detach(&buf, NULL);
1665
1666        options.no_cache = 1;
1667        ret = http_get_strbuf(url, &buf, &options);
1668        if (ret != HTTP_OK)
1669                goto cleanup;
1670
1671        data = buf.buf;
1672        while (i < buf.len) {
1673                switch (data[i]) {
1674                case 'P':
1675                        i++;
1676                        if (i + 52 <= buf.len &&
1677                            starts_with(data + i, " pack-") &&
1678                            starts_with(data + i + 46, ".pack\n")) {
1679                                get_sha1_hex(data + i + 6, sha1);
1680                                fetch_and_setup_pack_index(packs_head, sha1,
1681                                                      base_url);
1682                                i += 51;
1683                                break;
1684                        }
1685                default:
1686                        while (i < buf.len && data[i] != '\n')
1687                                i++;
1688                }
1689                i++;
1690        }
1691
1692cleanup:
1693        free(url);
1694        return ret;
1695}
1696
1697void release_http_pack_request(struct http_pack_request *preq)
1698{
1699        if (preq->packfile != NULL) {
1700                fclose(preq->packfile);
1701                preq->packfile = NULL;
1702        }
1703        preq->slot = NULL;
1704        free(preq->url);
1705        free(preq);
1706}
1707
1708int finish_http_pack_request(struct http_pack_request *preq)
1709{
1710        struct packed_git **lst;
1711        struct packed_git *p = preq->target;
1712        char *tmp_idx;
1713        size_t len;
1714        struct child_process ip = CHILD_PROCESS_INIT;
1715        const char *ip_argv[8];
1716
1717        close_pack_index(p);
1718
1719        fclose(preq->packfile);
1720        preq->packfile = NULL;
1721
1722        lst = preq->lst;
1723        while (*lst != p)
1724                lst = &((*lst)->next);
1725        *lst = (*lst)->next;
1726
1727        if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1728                die("BUG: pack tmpfile does not end in .pack.temp?");
1729        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1730
1731        ip_argv[0] = "index-pack";
1732        ip_argv[1] = "-o";
1733        ip_argv[2] = tmp_idx;
1734        ip_argv[3] = preq->tmpfile;
1735        ip_argv[4] = NULL;
1736
1737        ip.argv = ip_argv;
1738        ip.git_cmd = 1;
1739        ip.no_stdin = 1;
1740        ip.no_stdout = 1;
1741
1742        if (run_command(&ip)) {
1743                unlink(preq->tmpfile);
1744                unlink(tmp_idx);
1745                free(tmp_idx);
1746                return -1;
1747        }
1748
1749        unlink(sha1_pack_index_name(p->sha1));
1750
1751        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1752         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1753                free(tmp_idx);
1754                return -1;
1755        }
1756
1757        install_packed_git(p);
1758        free(tmp_idx);
1759        return 0;
1760}
1761
1762struct http_pack_request *new_http_pack_request(
1763        struct packed_git *target, const char *base_url)
1764{
1765        off_t prev_posn = 0;
1766        struct strbuf buf = STRBUF_INIT;
1767        struct http_pack_request *preq;
1768
1769        preq = xcalloc(1, sizeof(*preq));
1770        preq->target = target;
1771
1772        end_url_with_slash(&buf, base_url);
1773        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1774                sha1_to_hex(target->sha1));
1775        preq->url = strbuf_detach(&buf, NULL);
1776
1777        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1778                sha1_pack_name(target->sha1));
1779        preq->packfile = fopen(preq->tmpfile, "a");
1780        if (!preq->packfile) {
1781                error("Unable to open local file %s for pack",
1782                      preq->tmpfile);
1783                goto abort;
1784        }
1785
1786        preq->slot = get_active_slot();
1787        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1788        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1789        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1790        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1791                no_pragma_header);
1792
1793        /*
1794         * If there is data present from a previous transfer attempt,
1795         * resume where it left off
1796         */
1797        prev_posn = ftello(preq->packfile);
1798        if (prev_posn>0) {
1799                if (http_is_verbose)
1800                        fprintf(stderr,
1801                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1802                                sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1803                http_opt_request_remainder(preq->slot->curl, prev_posn);
1804        }
1805
1806        return preq;
1807
1808abort:
1809        free(preq->url);
1810        free(preq);
1811        return NULL;
1812}
1813
1814/* Helpers for fetching objects (loose) */
1815static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1816                               void *data)
1817{
1818        unsigned char expn[4096];
1819        size_t size = eltsize * nmemb;
1820        int posn = 0;
1821        struct http_object_request *freq =
1822                (struct http_object_request *)data;
1823        do {
1824                ssize_t retval = xwrite(freq->localfile,
1825                                        (char *) ptr + posn, size - posn);
1826                if (retval < 0)
1827                        return posn;
1828                posn += retval;
1829        } while (posn < size);
1830
1831        freq->stream.avail_in = size;
1832        freq->stream.next_in = (void *)ptr;
1833        do {
1834                freq->stream.next_out = expn;
1835                freq->stream.avail_out = sizeof(expn);
1836                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1837                git_SHA1_Update(&freq->c, expn,
1838                                sizeof(expn) - freq->stream.avail_out);
1839        } while (freq->stream.avail_in && freq->zret == Z_OK);
1840        return size;
1841}
1842
1843struct http_object_request *new_http_object_request(const char *base_url,
1844        unsigned char *sha1)
1845{
1846        char *hex = sha1_to_hex(sha1);
1847        const char *filename;
1848        char prevfile[PATH_MAX];
1849        int prevlocal;
1850        char prev_buf[PREV_BUF_SIZE];
1851        ssize_t prev_read = 0;
1852        off_t prev_posn = 0;
1853        struct http_object_request *freq;
1854
1855        freq = xcalloc(1, sizeof(*freq));
1856        hashcpy(freq->sha1, sha1);
1857        freq->localfile = -1;
1858
1859        filename = sha1_file_name(sha1);
1860        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1861                 "%s.temp", filename);
1862
1863        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1864        unlink_or_warn(prevfile);
1865        rename(freq->tmpfile, prevfile);
1866        unlink_or_warn(freq->tmpfile);
1867
1868        if (freq->localfile != -1)
1869                error("fd leakage in start: %d", freq->localfile);
1870        freq->localfile = open(freq->tmpfile,
1871                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1872        /*
1873         * This could have failed due to the "lazy directory creation";
1874         * try to mkdir the last path component.
1875         */
1876        if (freq->localfile < 0 && errno == ENOENT) {
1877                char *dir = strrchr(freq->tmpfile, '/');
1878                if (dir) {
1879                        *dir = 0;
1880                        mkdir(freq->tmpfile, 0777);
1881                        *dir = '/';
1882                }
1883                freq->localfile = open(freq->tmpfile,
1884                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1885        }
1886
1887        if (freq->localfile < 0) {
1888                error("Couldn't create temporary file %s: %s",
1889                      freq->tmpfile, strerror(errno));
1890                goto abort;
1891        }
1892
1893        git_inflate_init(&freq->stream);
1894
1895        git_SHA1_Init(&freq->c);
1896
1897        freq->url = get_remote_object_url(base_url, hex, 0);
1898
1899        /*
1900         * If a previous temp file is present, process what was already
1901         * fetched.
1902         */
1903        prevlocal = open(prevfile, O_RDONLY);
1904        if (prevlocal != -1) {
1905                do {
1906                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1907                        if (prev_read>0) {
1908                                if (fwrite_sha1_file(prev_buf,
1909                                                     1,
1910                                                     prev_read,
1911                                                     freq) == prev_read) {
1912                                        prev_posn += prev_read;
1913                                } else {
1914                                        prev_read = -1;
1915                                }
1916                        }
1917                } while (prev_read > 0);
1918                close(prevlocal);
1919        }
1920        unlink_or_warn(prevfile);
1921
1922        /*
1923         * Reset inflate/SHA1 if there was an error reading the previous temp
1924         * file; also rewind to the beginning of the local file.
1925         */
1926        if (prev_read == -1) {
1927                memset(&freq->stream, 0, sizeof(freq->stream));
1928                git_inflate_init(&freq->stream);
1929                git_SHA1_Init(&freq->c);
1930                if (prev_posn>0) {
1931                        prev_posn = 0;
1932                        lseek(freq->localfile, 0, SEEK_SET);
1933                        if (ftruncate(freq->localfile, 0) < 0) {
1934                                error("Couldn't truncate temporary file %s: %s",
1935                                          freq->tmpfile, strerror(errno));
1936                                goto abort;
1937                        }
1938                }
1939        }
1940
1941        freq->slot = get_active_slot();
1942
1943        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1944        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1945        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1946        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1947        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1948
1949        /*
1950         * If we have successfully processed data from a previous fetch
1951         * attempt, only fetch the data we don't already have.
1952         */
1953        if (prev_posn>0) {
1954                if (http_is_verbose)
1955                        fprintf(stderr,
1956                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1957                                hex, (uintmax_t)prev_posn);
1958                http_opt_request_remainder(freq->slot->curl, prev_posn);
1959        }
1960
1961        return freq;
1962
1963abort:
1964        free(freq->url);
1965        free(freq);
1966        return NULL;
1967}
1968
1969void process_http_object_request(struct http_object_request *freq)
1970{
1971        if (freq->slot == NULL)
1972                return;
1973        freq->curl_result = freq->slot->curl_result;
1974        freq->http_code = freq->slot->http_code;
1975        freq->slot = NULL;
1976}
1977
1978int finish_http_object_request(struct http_object_request *freq)
1979{
1980        struct stat st;
1981
1982        close(freq->localfile);
1983        freq->localfile = -1;
1984
1985        process_http_object_request(freq);
1986
1987        if (freq->http_code == 416) {
1988                warning("requested range invalid; we may already have all the data.");
1989        } else if (freq->curl_result != CURLE_OK) {
1990                if (stat(freq->tmpfile, &st) == 0)
1991                        if (st.st_size == 0)
1992                                unlink_or_warn(freq->tmpfile);
1993                return -1;
1994        }
1995
1996        git_inflate_end(&freq->stream);
1997        git_SHA1_Final(freq->real_sha1, &freq->c);
1998        if (freq->zret != Z_STREAM_END) {
1999                unlink_or_warn(freq->tmpfile);
2000                return -1;
2001        }
2002        if (hashcmp(freq->sha1, freq->real_sha1)) {
2003                unlink_or_warn(freq->tmpfile);
2004                return -1;
2005        }
2006        freq->rename =
2007                finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2008
2009        return freq->rename;
2010}
2011
2012void abort_http_object_request(struct http_object_request *freq)
2013{
2014        unlink_or_warn(freq->tmpfile);
2015
2016        release_http_object_request(freq);
2017}
2018
2019void release_http_object_request(struct http_object_request *freq)
2020{
2021        if (freq->localfile != -1) {
2022                close(freq->localfile);
2023                freq->localfile = -1;
2024        }
2025        if (freq->url != NULL) {
2026                free(freq->url);
2027                freq->url = NULL;
2028        }
2029        if (freq->slot != NULL) {
2030                freq->slot->callback_func = NULL;
2031                freq->slot->callback_data = NULL;
2032                release_active_slot(freq->slot);
2033                freq->slot = NULL;
2034        }
2035}