Andrew's git / gitweb.git / http.c
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http.con commit http: honor no_http env variable to bypass proxy (d445fda)
   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
  14int active_requests;
  15int http_is_verbose;
  16size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  17
  18#if LIBCURL_VERSION_NUM >= 0x070a06
  19#define LIBCURL_CAN_HANDLE_AUTH_ANY
  20#endif
  21
  22static int min_curl_sessions = 1;
  23static int curl_session_count;
  24#ifdef USE_CURL_MULTI
  25static int max_requests = -1;
  26static CURLM *curlm;
  27#endif
  28#ifndef NO_CURL_EASY_DUPHANDLE
  29static CURL *curl_default;
  30#endif
  31
  32#define PREV_BUF_SIZE 4096
  33
  34char curl_errorstr[CURL_ERROR_SIZE];
  35
  36static int curl_ssl_verify = -1;
  37static int curl_ssl_try;
  38static const char *ssl_cert;
  39static const char *ssl_cipherlist;
  40static const char *ssl_version;
  41static struct {
  42        const char *name;
  43        long ssl_version;
  44} sslversions[] = {
  45        { "sslv2", CURL_SSLVERSION_SSLv2 },
  46        { "sslv3", CURL_SSLVERSION_SSLv3 },
  47        { "tlsv1", CURL_SSLVERSION_TLSv1 },
  48#if LIBCURL_VERSION_NUM >= 0x072200
  49        { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  50        { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  51        { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  52#endif
  53};
  54#if LIBCURL_VERSION_NUM >= 0x070903
  55static const char *ssl_key;
  56#endif
  57#if LIBCURL_VERSION_NUM >= 0x070908
  58static const char *ssl_capath;
  59#endif
  60static const char *ssl_cainfo;
  61static long curl_low_speed_limit = -1;
  62static long curl_low_speed_time = -1;
  63static int curl_ftp_no_epsv;
  64static const char *curl_http_proxy;
  65static const char *curl_no_proxy;
  66static const char *http_proxy_authmethod;
  67static struct {
  68        const char *name;
  69        long curlauth_param;
  70} proxy_authmethods[] = {
  71        { "basic", CURLAUTH_BASIC },
  72        { "digest", CURLAUTH_DIGEST },
  73        { "negotiate", CURLAUTH_GSSNEGOTIATE },
  74        { "ntlm", CURLAUTH_NTLM },
  75#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  76        { "anyauth", CURLAUTH_ANY },
  77#endif
  78        /*
  79         * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  80         * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  81         * here, too
  82         */
  83};
  84static struct credential proxy_auth = CREDENTIAL_INIT;
  85static const char *curl_proxyuserpwd;
  86static const char *curl_cookie_file;
  87static int curl_save_cookies;
  88struct credential http_auth = CREDENTIAL_INIT;
  89static int http_proactive_auth;
  90static const char *user_agent;
  91
  92#if LIBCURL_VERSION_NUM >= 0x071700
  93/* Use CURLOPT_KEYPASSWD as is */
  94#elif LIBCURL_VERSION_NUM >= 0x070903
  95#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  96#else
  97#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  98#endif
  99
 100static struct credential cert_auth = CREDENTIAL_INIT;
 101static int ssl_cert_password_required;
 102#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 103static unsigned long http_auth_methods = CURLAUTH_ANY;
 104#endif
 105
 106static struct curl_slist *pragma_header;
 107static struct curl_slist *no_pragma_header;
 108
 109static struct active_request_slot *active_queue_head;
 110
 111static char *cached_accept_language;
 112
 113size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 114{
 115        size_t size = eltsize * nmemb;
 116        struct buffer *buffer = buffer_;
 117
 118        if (size > buffer->buf.len - buffer->posn)
 119                size = buffer->buf.len - buffer->posn;
 120        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 121        buffer->posn += size;
 122
 123        return size;
 124}
 125
 126#ifndef NO_CURL_IOCTL
 127curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 128{
 129        struct buffer *buffer = clientp;
 130
 131        switch (cmd) {
 132        case CURLIOCMD_NOP:
 133                return CURLIOE_OK;
 134
 135        case CURLIOCMD_RESTARTREAD:
 136                buffer->posn = 0;
 137                return CURLIOE_OK;
 138
 139        default:
 140                return CURLIOE_UNKNOWNCMD;
 141        }
 142}
 143#endif
 144
 145size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 146{
 147        size_t size = eltsize * nmemb;
 148        struct strbuf *buffer = buffer_;
 149
 150        strbuf_add(buffer, ptr, size);
 151        return size;
 152}
 153
 154size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 155{
 156        return eltsize * nmemb;
 157}
 158
 159static void closedown_active_slot(struct active_request_slot *slot)
 160{
 161        active_requests--;
 162        slot->in_use = 0;
 163}
 164
 165static void finish_active_slot(struct active_request_slot *slot)
 166{
 167        closedown_active_slot(slot);
 168        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 169
 170        if (slot->finished != NULL)
 171                (*slot->finished) = 1;
 172
 173        /* Store slot results so they can be read after the slot is reused */
 174        if (slot->results != NULL) {
 175                slot->results->curl_result = slot->curl_result;
 176                slot->results->http_code = slot->http_code;
 177#if LIBCURL_VERSION_NUM >= 0x070a08
 178                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 179                                  &slot->results->auth_avail);
 180#else
 181                slot->results->auth_avail = 0;
 182#endif
 183
 184                curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 185                        &slot->results->http_connectcode);
 186        }
 187
 188        /* Run callback if appropriate */
 189        if (slot->callback_func != NULL)
 190                slot->callback_func(slot->callback_data);
 191}
 192
 193#ifdef USE_CURL_MULTI
 194static void process_curl_messages(void)
 195{
 196        int num_messages;
 197        struct active_request_slot *slot;
 198        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 199
 200        while (curl_message != NULL) {
 201                if (curl_message->msg == CURLMSG_DONE) {
 202                        int curl_result = curl_message->data.result;
 203                        slot = active_queue_head;
 204                        while (slot != NULL &&
 205                               slot->curl != curl_message->easy_handle)
 206                                slot = slot->next;
 207                        if (slot != NULL) {
 208                                curl_multi_remove_handle(curlm, slot->curl);
 209                                slot->curl_result = curl_result;
 210                                finish_active_slot(slot);
 211                        } else {
 212                                fprintf(stderr, "Received DONE message for unknown request!\n");
 213                        }
 214                } else {
 215                        fprintf(stderr, "Unknown CURL message received: %d\n",
 216                                (int)curl_message->msg);
 217                }
 218                curl_message = curl_multi_info_read(curlm, &num_messages);
 219        }
 220}
 221#endif
 222
 223static int http_options(const char *var, const char *value, void *cb)
 224{
 225        if (!strcmp("http.sslverify", var)) {
 226                curl_ssl_verify = git_config_bool(var, value);
 227                return 0;
 228        }
 229        if (!strcmp("http.sslcipherlist", var))
 230                return git_config_string(&ssl_cipherlist, var, value);
 231        if (!strcmp("http.sslversion", var))
 232                return git_config_string(&ssl_version, var, value);
 233        if (!strcmp("http.sslcert", var))
 234                return git_config_string(&ssl_cert, var, value);
 235#if LIBCURL_VERSION_NUM >= 0x070903
 236        if (!strcmp("http.sslkey", var))
 237                return git_config_string(&ssl_key, var, value);
 238#endif
 239#if LIBCURL_VERSION_NUM >= 0x070908
 240        if (!strcmp("http.sslcapath", var))
 241                return git_config_pathname(&ssl_capath, var, value);
 242#endif
 243        if (!strcmp("http.sslcainfo", var))
 244                return git_config_pathname(&ssl_cainfo, var, value);
 245        if (!strcmp("http.sslcertpasswordprotected", var)) {
 246                ssl_cert_password_required = git_config_bool(var, value);
 247                return 0;
 248        }
 249        if (!strcmp("http.ssltry", var)) {
 250                curl_ssl_try = git_config_bool(var, value);
 251                return 0;
 252        }
 253        if (!strcmp("http.minsessions", var)) {
 254                min_curl_sessions = git_config_int(var, value);
 255#ifndef USE_CURL_MULTI
 256                if (min_curl_sessions > 1)
 257                        min_curl_sessions = 1;
 258#endif
 259                return 0;
 260        }
 261#ifdef USE_CURL_MULTI
 262        if (!strcmp("http.maxrequests", var)) {
 263                max_requests = git_config_int(var, value);
 264                return 0;
 265        }
 266#endif
 267        if (!strcmp("http.lowspeedlimit", var)) {
 268                curl_low_speed_limit = (long)git_config_int(var, value);
 269                return 0;
 270        }
 271        if (!strcmp("http.lowspeedtime", var)) {
 272                curl_low_speed_time = (long)git_config_int(var, value);
 273                return 0;
 274        }
 275
 276        if (!strcmp("http.noepsv", var)) {
 277                curl_ftp_no_epsv = git_config_bool(var, value);
 278                return 0;
 279        }
 280        if (!strcmp("http.proxy", var))
 281                return git_config_string(&curl_http_proxy, var, value);
 282
 283        if (!strcmp("http.proxyauthmethod", var))
 284                return git_config_string(&http_proxy_authmethod, var, value);
 285
 286        if (!strcmp("http.cookiefile", var))
 287                return git_config_string(&curl_cookie_file, var, value);
 288        if (!strcmp("http.savecookies", var)) {
 289                curl_save_cookies = git_config_bool(var, value);
 290                return 0;
 291        }
 292
 293        if (!strcmp("http.postbuffer", var)) {
 294                http_post_buffer = git_config_int(var, value);
 295                if (http_post_buffer < LARGE_PACKET_MAX)
 296                        http_post_buffer = LARGE_PACKET_MAX;
 297                return 0;
 298        }
 299
 300        if (!strcmp("http.useragent", var))
 301                return git_config_string(&user_agent, var, value);
 302
 303        /* Fall back on the default ones */
 304        return git_default_config(var, value, cb);
 305}
 306
 307static void init_curl_http_auth(CURL *result)
 308{
 309        if (!http_auth.username)
 310                return;
 311
 312        credential_fill(&http_auth);
 313
 314#if LIBCURL_VERSION_NUM >= 0x071301
 315        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 316        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 317#else
 318        {
 319                static struct strbuf up = STRBUF_INIT;
 320                /*
 321                 * Note that we assume we only ever have a single set of
 322                 * credentials in a given program run, so we do not have
 323                 * to worry about updating this buffer, only setting its
 324                 * initial value.
 325                 */
 326                if (!up.len)
 327                        strbuf_addf(&up, "%s:%s",
 328                                http_auth.username, http_auth.password);
 329                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 330        }
 331#endif
 332}
 333
 334/* *var must be free-able */
 335static void var_override(const char **var, char *value)
 336{
 337        if (value) {
 338                free((void *)*var);
 339                *var = xstrdup(value);
 340        }
 341}
 342
 343static void set_proxyauth_name_password(CURL *result)
 344{
 345#if LIBCURL_VERSION_NUM >= 0x071301
 346                curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 347                        proxy_auth.username);
 348                curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 349                        proxy_auth.password);
 350#else
 351                struct strbuf s = STRBUF_INIT;
 352
 353                strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 354                strbuf_addch(&s, ':');
 355                strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 356                curl_proxyuserpwd = strbuf_detach(&s, NULL);
 357                curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 358#endif
 359}
 360
 361static void init_curl_proxy_auth(CURL *result)
 362{
 363        if (proxy_auth.username) {
 364                if (!proxy_auth.password)
 365                        credential_fill(&proxy_auth);
 366                set_proxyauth_name_password(result);
 367        }
 368
 369        var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 370
 371#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 372        if (http_proxy_authmethod) {
 373                int i;
 374                for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 375                        if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 376                                curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 377                                                proxy_authmethods[i].curlauth_param);
 378                                break;
 379                        }
 380                }
 381                if (i == ARRAY_SIZE(proxy_authmethods)) {
 382                        warning("unsupported proxy authentication method %s: using anyauth",
 383                                        http_proxy_authmethod);
 384                        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 385                }
 386        }
 387        else
 388                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 389#endif
 390}
 391
 392static int has_cert_password(void)
 393{
 394        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 395                return 0;
 396        if (!cert_auth.password) {
 397                cert_auth.protocol = xstrdup("cert");
 398                cert_auth.username = xstrdup("");
 399                cert_auth.path = xstrdup(ssl_cert);
 400                credential_fill(&cert_auth);
 401        }
 402        return 1;
 403}
 404
 405#if LIBCURL_VERSION_NUM >= 0x071900
 406static void set_curl_keepalive(CURL *c)
 407{
 408        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 409}
 410
 411#elif LIBCURL_VERSION_NUM >= 0x071000
 412static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 413{
 414        int ka = 1;
 415        int rc;
 416        socklen_t len = (socklen_t)sizeof(ka);
 417
 418        if (type != CURLSOCKTYPE_IPCXN)
 419                return 0;
 420
 421        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 422        if (rc < 0)
 423                warning("unable to set SO_KEEPALIVE on socket %s",
 424                        strerror(errno));
 425
 426        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 427}
 428
 429static void set_curl_keepalive(CURL *c)
 430{
 431        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 432}
 433
 434#else
 435static void set_curl_keepalive(CURL *c)
 436{
 437        /* not supported on older curl versions */
 438}
 439#endif
 440
 441static CURL *get_curl_handle(void)
 442{
 443        CURL *result = curl_easy_init();
 444        long allowed_protocols = 0;
 445
 446        if (!result)
 447                die("curl_easy_init failed");
 448
 449        if (!curl_ssl_verify) {
 450                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 451                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 452        } else {
 453                /* Verify authenticity of the peer's certificate */
 454                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 455                /* The name in the cert must match whom we tried to connect */
 456                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 457        }
 458
 459#if LIBCURL_VERSION_NUM >= 0x070907
 460        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 461#endif
 462#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 463        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 464#endif
 465
 466        if (http_proactive_auth)
 467                init_curl_http_auth(result);
 468
 469        if (getenv("GIT_SSL_VERSION"))
 470                ssl_version = getenv("GIT_SSL_VERSION");
 471        if (ssl_version && *ssl_version) {
 472                int i;
 473                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 474                        if (!strcmp(ssl_version, sslversions[i].name)) {
 475                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 476                                                 sslversions[i].ssl_version);
 477                                break;
 478                        }
 479                }
 480                if (i == ARRAY_SIZE(sslversions))
 481                        warning("unsupported ssl version %s: using default",
 482                                ssl_version);
 483        }
 484
 485        if (getenv("GIT_SSL_CIPHER_LIST"))
 486                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 487        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 488                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 489                                ssl_cipherlist);
 490
 491        if (ssl_cert != NULL)
 492                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 493        if (has_cert_password())
 494                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 495#if LIBCURL_VERSION_NUM >= 0x070903
 496        if (ssl_key != NULL)
 497                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 498#endif
 499#if LIBCURL_VERSION_NUM >= 0x070908
 500        if (ssl_capath != NULL)
 501                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 502#endif
 503        if (ssl_cainfo != NULL)
 504                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 505
 506        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 507                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 508                                 curl_low_speed_limit);
 509                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 510                                 curl_low_speed_time);
 511        }
 512
 513        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 514        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 515#if LIBCURL_VERSION_NUM >= 0x071301
 516        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 517#elif LIBCURL_VERSION_NUM >= 0x071101
 518        curl_easy_setopt(result, CURLOPT_POST301, 1);
 519#endif
 520#if LIBCURL_VERSION_NUM >= 0x071304
 521        if (is_transport_allowed("http"))
 522                allowed_protocols |= CURLPROTO_HTTP;
 523        if (is_transport_allowed("https"))
 524                allowed_protocols |= CURLPROTO_HTTPS;
 525        if (is_transport_allowed("ftp"))
 526                allowed_protocols |= CURLPROTO_FTP;
 527        if (is_transport_allowed("ftps"))
 528                allowed_protocols |= CURLPROTO_FTPS;
 529        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 530#else
 531        if (transport_restrict_protocols())
 532                warning("protocol restrictions not applied to curl redirects because\n"
 533                        "your curl version is too old (>= 7.19.4)");
 534#endif
 535
 536        if (getenv("GIT_CURL_VERBOSE"))
 537                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 538
 539        curl_easy_setopt(result, CURLOPT_USERAGENT,
 540                user_agent ? user_agent : git_user_agent());
 541
 542        if (curl_ftp_no_epsv)
 543                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 544
 545#ifdef CURLOPT_USE_SSL
 546        if (curl_ssl_try)
 547                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 548#endif
 549
 550        /*
 551         * CURL also examines these variables as a fallback; but we need to query
 552         * them here in order to decide whether to prompt for missing password (cf.
 553         * init_curl_proxy_auth()).
 554         *
 555         * Unlike many other common environment variables, these are historically
 556         * lowercase only. It appears that CURL did not know this and implemented
 557         * only uppercase variants, which was later corrected to take both - with
 558         * the exception of http_proxy, which is lowercase only also in CURL. As
 559         * the lowercase versions are the historical quasi-standard, they take
 560         * precedence here, as in CURL.
 561         */
 562        if (!curl_http_proxy) {
 563                if (!strcmp(http_auth.protocol, "https")) {
 564                        var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 565                        var_override(&curl_http_proxy, getenv("https_proxy"));
 566                } else {
 567                        var_override(&curl_http_proxy, getenv("http_proxy"));
 568                }
 569                if (!curl_http_proxy) {
 570                        var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 571                        var_override(&curl_http_proxy, getenv("all_proxy"));
 572                }
 573        }
 574
 575        if (curl_http_proxy) {
 576                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 577#if LIBCURL_VERSION_NUM >= 0x071800
 578                if (starts_with(curl_http_proxy, "socks5"))
 579                        curl_easy_setopt(result,
 580                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 581                else if (starts_with(curl_http_proxy, "socks4a"))
 582                        curl_easy_setopt(result,
 583                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 584                else if (starts_with(curl_http_proxy, "socks"))
 585                        curl_easy_setopt(result,
 586                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 587#endif
 588                if (strstr(curl_http_proxy, "://"))
 589                        credential_from_url(&proxy_auth, curl_http_proxy);
 590                else {
 591                        struct strbuf url = STRBUF_INIT;
 592                        strbuf_addf(&url, "http://%s", curl_http_proxy);
 593                        credential_from_url(&proxy_auth, url.buf);
 594                        strbuf_release(&url);
 595                }
 596
 597                curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 598#if LIBCURL_VERSION_NUM >= 0x071304
 599                var_override(&curl_no_proxy, getenv("NO_PROXY"));
 600                var_override(&curl_no_proxy, getenv("no_proxy"));
 601                curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 602#endif
 603        }
 604        init_curl_proxy_auth(result);
 605
 606        set_curl_keepalive(result);
 607
 608        return result;
 609}
 610
 611static void set_from_env(const char **var, const char *envname)
 612{
 613        const char *val = getenv(envname);
 614        if (val)
 615                *var = val;
 616}
 617
 618void http_init(struct remote *remote, const char *url, int proactive_auth)
 619{
 620        char *low_speed_limit;
 621        char *low_speed_time;
 622        char *normalized_url;
 623        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 624
 625        config.section = "http";
 626        config.key = NULL;
 627        config.collect_fn = http_options;
 628        config.cascade_fn = git_default_config;
 629        config.cb = NULL;
 630
 631        http_is_verbose = 0;
 632        normalized_url = url_normalize(url, &config.url);
 633
 634        git_config(urlmatch_config_entry, &config);
 635        free(normalized_url);
 636
 637        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 638                die("curl_global_init failed");
 639
 640        http_proactive_auth = proactive_auth;
 641
 642        if (remote && remote->http_proxy)
 643                curl_http_proxy = xstrdup(remote->http_proxy);
 644
 645        if (remote)
 646                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 647
 648        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 649        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 650
 651#ifdef USE_CURL_MULTI
 652        {
 653                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 654                if (http_max_requests != NULL)
 655                        max_requests = atoi(http_max_requests);
 656        }
 657
 658        curlm = curl_multi_init();
 659        if (!curlm)
 660                die("curl_multi_init failed");
 661#endif
 662
 663        if (getenv("GIT_SSL_NO_VERIFY"))
 664                curl_ssl_verify = 0;
 665
 666        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 667#if LIBCURL_VERSION_NUM >= 0x070903
 668        set_from_env(&ssl_key, "GIT_SSL_KEY");
 669#endif
 670#if LIBCURL_VERSION_NUM >= 0x070908
 671        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 672#endif
 673        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 674
 675        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 676
 677        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 678        if (low_speed_limit != NULL)
 679                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 680        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 681        if (low_speed_time != NULL)
 682                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 683
 684        if (curl_ssl_verify == -1)
 685                curl_ssl_verify = 1;
 686
 687        curl_session_count = 0;
 688#ifdef USE_CURL_MULTI
 689        if (max_requests < 1)
 690                max_requests = DEFAULT_MAX_REQUESTS;
 691#endif
 692
 693        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 694                curl_ftp_no_epsv = 1;
 695
 696        if (url) {
 697                credential_from_url(&http_auth, url);
 698                if (!ssl_cert_password_required &&
 699                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 700                    starts_with(url, "https://"))
 701                        ssl_cert_password_required = 1;
 702        }
 703
 704#ifndef NO_CURL_EASY_DUPHANDLE
 705        curl_default = get_curl_handle();
 706#endif
 707}
 708
 709void http_cleanup(void)
 710{
 711        struct active_request_slot *slot = active_queue_head;
 712
 713        while (slot != NULL) {
 714                struct active_request_slot *next = slot->next;
 715                if (slot->curl != NULL) {
 716#ifdef USE_CURL_MULTI
 717                        curl_multi_remove_handle(curlm, slot->curl);
 718#endif
 719                        curl_easy_cleanup(slot->curl);
 720                }
 721                free(slot);
 722                slot = next;
 723        }
 724        active_queue_head = NULL;
 725
 726#ifndef NO_CURL_EASY_DUPHANDLE
 727        curl_easy_cleanup(curl_default);
 728#endif
 729
 730#ifdef USE_CURL_MULTI
 731        curl_multi_cleanup(curlm);
 732#endif
 733        curl_global_cleanup();
 734
 735        curl_slist_free_all(pragma_header);
 736        pragma_header = NULL;
 737
 738        curl_slist_free_all(no_pragma_header);
 739        no_pragma_header = NULL;
 740
 741        if (curl_http_proxy) {
 742                free((void *)curl_http_proxy);
 743                curl_http_proxy = NULL;
 744        }
 745
 746        if (proxy_auth.password) {
 747                memset(proxy_auth.password, 0, strlen(proxy_auth.password));
 748                free(proxy_auth.password);
 749                proxy_auth.password = NULL;
 750        }
 751
 752        free((void *)curl_proxyuserpwd);
 753        curl_proxyuserpwd = NULL;
 754
 755        free((void *)http_proxy_authmethod);
 756        http_proxy_authmethod = NULL;
 757
 758        if (cert_auth.password != NULL) {
 759                memset(cert_auth.password, 0, strlen(cert_auth.password));
 760                free(cert_auth.password);
 761                cert_auth.password = NULL;
 762        }
 763        ssl_cert_password_required = 0;
 764
 765        free(cached_accept_language);
 766        cached_accept_language = NULL;
 767}
 768
 769struct active_request_slot *get_active_slot(void)
 770{
 771        struct active_request_slot *slot = active_queue_head;
 772        struct active_request_slot *newslot;
 773
 774#ifdef USE_CURL_MULTI
 775        int num_transfers;
 776
 777        /* Wait for a slot to open up if the queue is full */
 778        while (active_requests >= max_requests) {
 779                curl_multi_perform(curlm, &num_transfers);
 780                if (num_transfers < active_requests)
 781                        process_curl_messages();
 782        }
 783#endif
 784
 785        while (slot != NULL && slot->in_use)
 786                slot = slot->next;
 787
 788        if (slot == NULL) {
 789                newslot = xmalloc(sizeof(*newslot));
 790                newslot->curl = NULL;
 791                newslot->in_use = 0;
 792                newslot->next = NULL;
 793
 794                slot = active_queue_head;
 795                if (slot == NULL) {
 796                        active_queue_head = newslot;
 797                } else {
 798                        while (slot->next != NULL)
 799                                slot = slot->next;
 800                        slot->next = newslot;
 801                }
 802                slot = newslot;
 803        }
 804
 805        if (slot->curl == NULL) {
 806#ifdef NO_CURL_EASY_DUPHANDLE
 807                slot->curl = get_curl_handle();
 808#else
 809                slot->curl = curl_easy_duphandle(curl_default);
 810#endif
 811                curl_session_count++;
 812        }
 813
 814        active_requests++;
 815        slot->in_use = 1;
 816        slot->results = NULL;
 817        slot->finished = NULL;
 818        slot->callback_data = NULL;
 819        slot->callback_func = NULL;
 820        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 821        if (curl_save_cookies)
 822                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 823        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 824        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 825        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 826        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 827        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 828        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 829        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 830        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 831        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 832        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
 833#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 834        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 835#endif
 836        if (http_auth.password)
 837                init_curl_http_auth(slot->curl);
 838
 839        return slot;
 840}
 841
 842int start_active_slot(struct active_request_slot *slot)
 843{
 844#ifdef USE_CURL_MULTI
 845        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 846        int num_transfers;
 847
 848        if (curlm_result != CURLM_OK &&
 849            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 850                active_requests--;
 851                slot->in_use = 0;
 852                return 0;
 853        }
 854
 855        /*
 856         * We know there must be something to do, since we just added
 857         * something.
 858         */
 859        curl_multi_perform(curlm, &num_transfers);
 860#endif
 861        return 1;
 862}
 863
 864#ifdef USE_CURL_MULTI
 865struct fill_chain {
 866        void *data;
 867        int (*fill)(void *);
 868        struct fill_chain *next;
 869};
 870
 871static struct fill_chain *fill_cfg;
 872
 873void add_fill_function(void *data, int (*fill)(void *))
 874{
 875        struct fill_chain *new = xmalloc(sizeof(*new));
 876        struct fill_chain **linkp = &fill_cfg;
 877        new->data = data;
 878        new->fill = fill;
 879        new->next = NULL;
 880        while (*linkp)
 881                linkp = &(*linkp)->next;
 882        *linkp = new;
 883}
 884
 885void fill_active_slots(void)
 886{
 887        struct active_request_slot *slot = active_queue_head;
 888
 889        while (active_requests < max_requests) {
 890                struct fill_chain *fill;
 891                for (fill = fill_cfg; fill; fill = fill->next)
 892                        if (fill->fill(fill->data))
 893                                break;
 894
 895                if (!fill)
 896                        break;
 897        }
 898
 899        while (slot != NULL) {
 900                if (!slot->in_use && slot->curl != NULL
 901                        && curl_session_count > min_curl_sessions) {
 902                        curl_easy_cleanup(slot->curl);
 903                        slot->curl = NULL;
 904                        curl_session_count--;
 905                }
 906                slot = slot->next;
 907        }
 908}
 909
 910void step_active_slots(void)
 911{
 912        int num_transfers;
 913        CURLMcode curlm_result;
 914
 915        do {
 916                curlm_result = curl_multi_perform(curlm, &num_transfers);
 917        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 918        if (num_transfers < active_requests) {
 919                process_curl_messages();
 920                fill_active_slots();
 921        }
 922}
 923#endif
 924
 925void run_active_slot(struct active_request_slot *slot)
 926{
 927#ifdef USE_CURL_MULTI
 928        fd_set readfds;
 929        fd_set writefds;
 930        fd_set excfds;
 931        int max_fd;
 932        struct timeval select_timeout;
 933        int finished = 0;
 934
 935        slot->finished = &finished;
 936        while (!finished) {
 937                step_active_slots();
 938
 939                if (slot->in_use) {
 940#if LIBCURL_VERSION_NUM >= 0x070f04
 941                        long curl_timeout;
 942                        curl_multi_timeout(curlm, &curl_timeout);
 943                        if (curl_timeout == 0) {
 944                                continue;
 945                        } else if (curl_timeout == -1) {
 946                                select_timeout.tv_sec  = 0;
 947                                select_timeout.tv_usec = 50000;
 948                        } else {
 949                                select_timeout.tv_sec  =  curl_timeout / 1000;
 950                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 951                        }
 952#else
 953                        select_timeout.tv_sec  = 0;
 954                        select_timeout.tv_usec = 50000;
 955#endif
 956
 957                        max_fd = -1;
 958                        FD_ZERO(&readfds);
 959                        FD_ZERO(&writefds);
 960                        FD_ZERO(&excfds);
 961                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 962
 963                        /*
 964                         * It can happen that curl_multi_timeout returns a pathologically
 965                         * long timeout when curl_multi_fdset returns no file descriptors
 966                         * to read.  See commit message for more details.
 967                         */
 968                        if (max_fd < 0 &&
 969                            (select_timeout.tv_sec > 0 ||
 970                             select_timeout.tv_usec > 50000)) {
 971                                select_timeout.tv_sec  = 0;
 972                                select_timeout.tv_usec = 50000;
 973                        }
 974
 975                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 976                }
 977        }
 978#else
 979        while (slot->in_use) {
 980                slot->curl_result = curl_easy_perform(slot->curl);
 981                finish_active_slot(slot);
 982        }
 983#endif
 984}
 985
 986static void release_active_slot(struct active_request_slot *slot)
 987{
 988        closedown_active_slot(slot);
 989        if (slot->curl && curl_session_count > min_curl_sessions) {
 990#ifdef USE_CURL_MULTI
 991                curl_multi_remove_handle(curlm, slot->curl);
 992#endif
 993                curl_easy_cleanup(slot->curl);
 994                slot->curl = NULL;
 995                curl_session_count--;
 996        }
 997#ifdef USE_CURL_MULTI
 998        fill_active_slots();
 999#endif
1000}
1001
1002void finish_all_active_slots(void)
1003{
1004        struct active_request_slot *slot = active_queue_head;
1005
1006        while (slot != NULL)
1007                if (slot->in_use) {
1008                        run_active_slot(slot);
1009                        slot = active_queue_head;
1010                } else {
1011                        slot = slot->next;
1012                }
1013}
1014
1015/* Helpers for modifying and creating URLs */
1016static inline int needs_quote(int ch)
1017{
1018        if (((ch >= 'A') && (ch <= 'Z'))
1019                        || ((ch >= 'a') && (ch <= 'z'))
1020                        || ((ch >= '0') && (ch <= '9'))
1021                        || (ch == '/')
1022                        || (ch == '-')
1023                        || (ch == '.'))
1024                return 0;
1025        return 1;
1026}
1027
1028static char *quote_ref_url(const char *base, const char *ref)
1029{
1030        struct strbuf buf = STRBUF_INIT;
1031        const char *cp;
1032        int ch;
1033
1034        end_url_with_slash(&buf, base);
1035
1036        for (cp = ref; (ch = *cp) != 0; cp++)
1037                if (needs_quote(ch))
1038                        strbuf_addf(&buf, "%%%02x", ch);
1039                else
1040                        strbuf_addch(&buf, *cp);
1041
1042        return strbuf_detach(&buf, NULL);
1043}
1044
1045void append_remote_object_url(struct strbuf *buf, const char *url,
1046                              const char *hex,
1047                              int only_two_digit_prefix)
1048{
1049        end_url_with_slash(buf, url);
1050
1051        strbuf_addf(buf, "objects/%.*s/", 2, hex);
1052        if (!only_two_digit_prefix)
1053                strbuf_addf(buf, "%s", hex+2);
1054}
1055
1056char *get_remote_object_url(const char *url, const char *hex,
1057                            int only_two_digit_prefix)
1058{
1059        struct strbuf buf = STRBUF_INIT;
1060        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1061        return strbuf_detach(&buf, NULL);
1062}
1063
1064static int handle_curl_result(struct slot_results *results)
1065{
1066        /*
1067         * If we see a failing http code with CURLE_OK, we have turned off
1068         * FAILONERROR (to keep the server's custom error response), and should
1069         * translate the code into failure here.
1070         */
1071        if (results->curl_result == CURLE_OK &&
1072            results->http_code >= 400) {
1073                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1074                /*
1075                 * Normally curl will already have put the "reason phrase"
1076                 * from the server into curl_errorstr; unfortunately without
1077                 * FAILONERROR it is lost, so we can give only the numeric
1078                 * status code.
1079                 */
1080                snprintf(curl_errorstr, sizeof(curl_errorstr),
1081                         "The requested URL returned error: %ld",
1082                         results->http_code);
1083        }
1084
1085        if (results->curl_result == CURLE_OK) {
1086                credential_approve(&http_auth);
1087                if (proxy_auth.password)
1088                        credential_approve(&proxy_auth);
1089                return HTTP_OK;
1090        } else if (missing_target(results))
1091                return HTTP_MISSING_TARGET;
1092        else if (results->http_code == 401) {
1093                if (http_auth.username && http_auth.password) {
1094                        credential_reject(&http_auth);
1095                        return HTTP_NOAUTH;
1096                } else {
1097#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1098                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1099#endif
1100                        return HTTP_REAUTH;
1101                }
1102        } else {
1103                if (results->http_connectcode == 407)
1104                        credential_reject(&proxy_auth);
1105#if LIBCURL_VERSION_NUM >= 0x070c00
1106                if (!curl_errorstr[0])
1107                        strlcpy(curl_errorstr,
1108                                curl_easy_strerror(results->curl_result),
1109                                sizeof(curl_errorstr));
1110#endif
1111                return HTTP_ERROR;
1112        }
1113}
1114
1115int run_one_slot(struct active_request_slot *slot,
1116                 struct slot_results *results)
1117{
1118        slot->results = results;
1119        if (!start_active_slot(slot)) {
1120                snprintf(curl_errorstr, sizeof(curl_errorstr),
1121                         "failed to start HTTP request");
1122                return HTTP_START_FAILED;
1123        }
1124
1125        run_active_slot(slot);
1126        return handle_curl_result(results);
1127}
1128
1129static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1130{
1131        char *ptr;
1132        CURLcode ret;
1133
1134        strbuf_reset(buf);
1135        ret = curl_easy_getinfo(curl, info, &ptr);
1136        if (!ret && ptr)
1137                strbuf_addstr(buf, ptr);
1138        return ret;
1139}
1140
1141/*
1142 * Check for and extract a content-type parameter. "raw"
1143 * should be positioned at the start of the potential
1144 * parameter, with any whitespace already removed.
1145 *
1146 * "name" is the name of the parameter. The value is appended
1147 * to "out".
1148 */
1149static int extract_param(const char *raw, const char *name,
1150                         struct strbuf *out)
1151{
1152        size_t len = strlen(name);
1153
1154        if (strncasecmp(raw, name, len))
1155                return -1;
1156        raw += len;
1157
1158        if (*raw != '=')
1159                return -1;
1160        raw++;
1161
1162        while (*raw && !isspace(*raw) && *raw != ';')
1163                strbuf_addch(out, *raw++);
1164        return 0;
1165}
1166
1167/*
1168 * Extract a normalized version of the content type, with any
1169 * spaces suppressed, all letters lowercased, and no trailing ";"
1170 * or parameters.
1171 *
1172 * Note that we will silently remove even invalid whitespace. For
1173 * example, "text / plain" is specifically forbidden by RFC 2616,
1174 * but "text/plain" is the only reasonable output, and this keeps
1175 * our code simple.
1176 *
1177 * If the "charset" argument is not NULL, store the value of any
1178 * charset parameter there.
1179 *
1180 * Example:
1181 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1182 *   "text / plain" -> "text/plain"
1183 */
1184static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1185                                 struct strbuf *charset)
1186{
1187        const char *p;
1188
1189        strbuf_reset(type);
1190        strbuf_grow(type, raw->len);
1191        for (p = raw->buf; *p; p++) {
1192                if (isspace(*p))
1193                        continue;
1194                if (*p == ';') {
1195                        p++;
1196                        break;
1197                }
1198                strbuf_addch(type, tolower(*p));
1199        }
1200
1201        if (!charset)
1202                return;
1203
1204        strbuf_reset(charset);
1205        while (*p) {
1206                while (isspace(*p) || *p == ';')
1207                        p++;
1208                if (!extract_param(p, "charset", charset))
1209                        return;
1210                while (*p && !isspace(*p))
1211                        p++;
1212        }
1213
1214        if (!charset->len && starts_with(type->buf, "text/"))
1215                strbuf_addstr(charset, "ISO-8859-1");
1216}
1217
1218static void write_accept_language(struct strbuf *buf)
1219{
1220        /*
1221         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1222         * that, q-value will be smaller than 0.001, the minimum q-value the
1223         * HTTP specification allows. See
1224         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1225         */
1226        const int MAX_DECIMAL_PLACES = 3;
1227        const int MAX_LANGUAGE_TAGS = 1000;
1228        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1229        char **language_tags = NULL;
1230        int num_langs = 0;
1231        const char *s = get_preferred_languages();
1232        int i;
1233        struct strbuf tag = STRBUF_INIT;
1234
1235        /* Don't add Accept-Language header if no language is preferred. */
1236        if (!s)
1237                return;
1238
1239        /*
1240         * Split the colon-separated string of preferred languages into
1241         * language_tags array.
1242         */
1243        do {
1244                /* collect language tag */
1245                for (; *s && (isalnum(*s) || *s == '_'); s++)
1246                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1247
1248                /* skip .codeset, @modifier and any other unnecessary parts */
1249                while (*s && *s != ':')
1250                        s++;
1251
1252                if (tag.len) {
1253                        num_langs++;
1254                        REALLOC_ARRAY(language_tags, num_langs);
1255                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1256                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1257                                break;
1258                }
1259        } while (*s++);
1260
1261        /* write Accept-Language header into buf */
1262        if (num_langs) {
1263                int last_buf_len = 0;
1264                int max_q;
1265                int decimal_places;
1266                char q_format[32];
1267
1268                /* add '*' */
1269                REALLOC_ARRAY(language_tags, num_langs + 1);
1270                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1271
1272                /* compute decimal_places */
1273                for (max_q = 1, decimal_places = 0;
1274                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1275                     decimal_places++, max_q *= 10)
1276                        ;
1277
1278                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1279
1280                strbuf_addstr(buf, "Accept-Language: ");
1281
1282                for (i = 0; i < num_langs; i++) {
1283                        if (i > 0)
1284                                strbuf_addstr(buf, ", ");
1285
1286                        strbuf_addstr(buf, language_tags[i]);
1287
1288                        if (i > 0)
1289                                strbuf_addf(buf, q_format, max_q - i);
1290
1291                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1292                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1293                                break;
1294                        }
1295
1296                        last_buf_len = buf->len;
1297                }
1298        }
1299
1300        /* free language tags -- last one is a static '*' */
1301        for (i = 0; i < num_langs - 1; i++)
1302                free(language_tags[i]);
1303        free(language_tags);
1304}
1305
1306/*
1307 * Get an Accept-Language header which indicates user's preferred languages.
1308 *
1309 * Examples:
1310 *   LANGUAGE= -> ""
1311 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1312 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1313 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1314 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1315 *   LANGUAGE= LANG=C -> ""
1316 */
1317static const char *get_accept_language(void)
1318{
1319        if (!cached_accept_language) {
1320                struct strbuf buf = STRBUF_INIT;
1321                write_accept_language(&buf);
1322                if (buf.len > 0)
1323                        cached_accept_language = strbuf_detach(&buf, NULL);
1324        }
1325
1326        return cached_accept_language;
1327}
1328
1329static void http_opt_request_remainder(CURL *curl, off_t pos)
1330{
1331        char buf[128];
1332        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1333        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1334}
1335
1336/* http_request() targets */
1337#define HTTP_REQUEST_STRBUF     0
1338#define HTTP_REQUEST_FILE       1
1339
1340static int http_request(const char *url,
1341                        void *result, int target,
1342                        const struct http_get_options *options)
1343{
1344        struct active_request_slot *slot;
1345        struct slot_results results;
1346        struct curl_slist *headers = NULL;
1347        struct strbuf buf = STRBUF_INIT;
1348        const char *accept_language;
1349        int ret;
1350
1351        slot = get_active_slot();
1352        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1353
1354        if (result == NULL) {
1355                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1356        } else {
1357                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1358                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1359
1360                if (target == HTTP_REQUEST_FILE) {
1361                        off_t posn = ftello(result);
1362                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1363                                         fwrite);
1364                        if (posn > 0)
1365                                http_opt_request_remainder(slot->curl, posn);
1366                } else
1367                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1368                                         fwrite_buffer);
1369        }
1370
1371        accept_language = get_accept_language();
1372
1373        if (accept_language)
1374                headers = curl_slist_append(headers, accept_language);
1375
1376        strbuf_addstr(&buf, "Pragma:");
1377        if (options && options->no_cache)
1378                strbuf_addstr(&buf, " no-cache");
1379        if (options && options->keep_error)
1380                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1381
1382        headers = curl_slist_append(headers, buf.buf);
1383
1384        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1385        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1386        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1387
1388        ret = run_one_slot(slot, &results);
1389
1390        if (options && options->content_type) {
1391                struct strbuf raw = STRBUF_INIT;
1392                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1393                extract_content_type(&raw, options->content_type,
1394                                     options->charset);
1395                strbuf_release(&raw);
1396        }
1397
1398        if (options && options->effective_url)
1399                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1400                                options->effective_url);
1401
1402        curl_slist_free_all(headers);
1403        strbuf_release(&buf);
1404
1405        return ret;
1406}
1407
1408/*
1409 * Update the "base" url to a more appropriate value, as deduced by
1410 * redirects seen when requesting a URL starting with "url".
1411 *
1412 * The "asked" parameter is a URL that we asked curl to access, and must begin
1413 * with "base".
1414 *
1415 * The "got" parameter is the URL that curl reported to us as where we ended
1416 * up.
1417 *
1418 * Returns 1 if we updated the base url, 0 otherwise.
1419 *
1420 * Our basic strategy is to compare "base" and "asked" to find the bits
1421 * specific to our request. We then strip those bits off of "got" to yield the
1422 * new base. So for example, if our base is "http://example.com/foo.git",
1423 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1424 * with "https://other.example.com/foo.git/info/refs". We would want the
1425 * new URL to become "https://other.example.com/foo.git".
1426 *
1427 * Note that this assumes a sane redirect scheme. It's entirely possible
1428 * in the example above to end up at a URL that does not even end in
1429 * "info/refs".  In such a case we simply punt, as there is not much we can
1430 * do (and such a scheme is unlikely to represent a real git repository,
1431 * which means we are likely about to abort anyway).
1432 */
1433static int update_url_from_redirect(struct strbuf *base,
1434                                    const char *asked,
1435                                    const struct strbuf *got)
1436{
1437        const char *tail;
1438        size_t tail_len;
1439
1440        if (!strcmp(asked, got->buf))
1441                return 0;
1442
1443        if (!skip_prefix(asked, base->buf, &tail))
1444                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1445                    asked, base->buf);
1446
1447        tail_len = strlen(tail);
1448
1449        if (got->len < tail_len ||
1450            strcmp(tail, got->buf + got->len - tail_len))
1451                return 0; /* insane redirect scheme */
1452
1453        strbuf_reset(base);
1454        strbuf_add(base, got->buf, got->len - tail_len);
1455        return 1;
1456}
1457
1458static int http_request_reauth(const char *url,
1459                               void *result, int target,
1460                               struct http_get_options *options)
1461{
1462        int ret = http_request(url, result, target, options);
1463
1464        if (options && options->effective_url && options->base_url) {
1465                if (update_url_from_redirect(options->base_url,
1466                                             url, options->effective_url)) {
1467                        credential_from_url(&http_auth, options->base_url->buf);
1468                        url = options->effective_url->buf;
1469                }
1470        }
1471
1472        if (ret != HTTP_REAUTH)
1473                return ret;
1474
1475        /*
1476         * If we are using KEEP_ERROR, the previous request may have
1477         * put cruft into our output stream; we should clear it out before
1478         * making our next request. We only know how to do this for
1479         * the strbuf case, but that is enough to satisfy current callers.
1480         */
1481        if (options && options->keep_error) {
1482                switch (target) {
1483                case HTTP_REQUEST_STRBUF:
1484                        strbuf_reset(result);
1485                        break;
1486                default:
1487                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1488                }
1489        }
1490
1491        credential_fill(&http_auth);
1492
1493        return http_request(url, result, target, options);
1494}
1495
1496int http_get_strbuf(const char *url,
1497                    struct strbuf *result,
1498                    struct http_get_options *options)
1499{
1500        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1501}
1502
1503/*
1504 * Downloads a URL and stores the result in the given file.
1505 *
1506 * If a previous interrupted download is detected (i.e. a previous temporary
1507 * file is still around) the download is resumed.
1508 */
1509static int http_get_file(const char *url, const char *filename,
1510                         struct http_get_options *options)
1511{
1512        int ret;
1513        struct strbuf tmpfile = STRBUF_INIT;
1514        FILE *result;
1515
1516        strbuf_addf(&tmpfile, "%s.temp", filename);
1517        result = fopen(tmpfile.buf, "a");
1518        if (!result) {
1519                error("Unable to open local file %s", tmpfile.buf);
1520                ret = HTTP_ERROR;
1521                goto cleanup;
1522        }
1523
1524        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1525        fclose(result);
1526
1527        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1528                ret = HTTP_ERROR;
1529cleanup:
1530        strbuf_release(&tmpfile);
1531        return ret;
1532}
1533
1534int http_fetch_ref(const char *base, struct ref *ref)
1535{
1536        struct http_get_options options = {0};
1537        char *url;
1538        struct strbuf buffer = STRBUF_INIT;
1539        int ret = -1;
1540
1541        options.no_cache = 1;
1542
1543        url = quote_ref_url(base, ref->name);
1544        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1545                strbuf_rtrim(&buffer);
1546                if (buffer.len == 40)
1547                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
1548                else if (starts_with(buffer.buf, "ref: ")) {
1549                        ref->symref = xstrdup(buffer.buf + 5);
1550                        ret = 0;
1551                }
1552        }
1553
1554        strbuf_release(&buffer);
1555        free(url);
1556        return ret;
1557}
1558
1559/* Helpers for fetching packs */
1560static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1561{
1562        char *url, *tmp;
1563        struct strbuf buf = STRBUF_INIT;
1564
1565        if (http_is_verbose)
1566                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1567
1568        end_url_with_slash(&buf, base_url);
1569        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1570        url = strbuf_detach(&buf, NULL);
1571
1572        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1573        tmp = strbuf_detach(&buf, NULL);
1574
1575        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1576                error("Unable to get pack index %s", url);
1577                free(tmp);
1578                tmp = NULL;
1579        }
1580
1581        free(url);
1582        return tmp;
1583}
1584
1585static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1586        unsigned char *sha1, const char *base_url)
1587{
1588        struct packed_git *new_pack;
1589        char *tmp_idx = NULL;
1590        int ret;
1591
1592        if (has_pack_index(sha1)) {
1593                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1594                if (!new_pack)
1595                        return -1; /* parse_pack_index() already issued error message */
1596                goto add_pack;
1597        }
1598
1599        tmp_idx = fetch_pack_index(sha1, base_url);
1600        if (!tmp_idx)
1601                return -1;
1602
1603        new_pack = parse_pack_index(sha1, tmp_idx);
1604        if (!new_pack) {
1605                unlink(tmp_idx);
1606                free(tmp_idx);
1607
1608                return -1; /* parse_pack_index() already issued error message */
1609        }
1610
1611        ret = verify_pack_index(new_pack);
1612        if (!ret) {
1613                close_pack_index(new_pack);
1614                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1615        }
1616        free(tmp_idx);
1617        if (ret)
1618                return -1;
1619
1620add_pack:
1621        new_pack->next = *packs_head;
1622        *packs_head = new_pack;
1623        return 0;
1624}
1625
1626int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1627{
1628        struct http_get_options options = {0};
1629        int ret = 0, i = 0;
1630        char *url, *data;
1631        struct strbuf buf = STRBUF_INIT;
1632        unsigned char sha1[20];
1633
1634        end_url_with_slash(&buf, base_url);
1635        strbuf_addstr(&buf, "objects/info/packs");
1636        url = strbuf_detach(&buf, NULL);
1637
1638        options.no_cache = 1;
1639        ret = http_get_strbuf(url, &buf, &options);
1640        if (ret != HTTP_OK)
1641                goto cleanup;
1642
1643        data = buf.buf;
1644        while (i < buf.len) {
1645                switch (data[i]) {
1646                case 'P':
1647                        i++;
1648                        if (i + 52 <= buf.len &&
1649                            starts_with(data + i, " pack-") &&
1650                            starts_with(data + i + 46, ".pack\n")) {
1651                                get_sha1_hex(data + i + 6, sha1);
1652                                fetch_and_setup_pack_index(packs_head, sha1,
1653                                                      base_url);
1654                                i += 51;
1655                                break;
1656                        }
1657                default:
1658                        while (i < buf.len && data[i] != '\n')
1659                                i++;
1660                }
1661                i++;
1662        }
1663
1664cleanup:
1665        free(url);
1666        return ret;
1667}
1668
1669void release_http_pack_request(struct http_pack_request *preq)
1670{
1671        if (preq->packfile != NULL) {
1672                fclose(preq->packfile);
1673                preq->packfile = NULL;
1674        }
1675        preq->slot = NULL;
1676        free(preq->url);
1677        free(preq);
1678}
1679
1680int finish_http_pack_request(struct http_pack_request *preq)
1681{
1682        struct packed_git **lst;
1683        struct packed_git *p = preq->target;
1684        char *tmp_idx;
1685        size_t len;
1686        struct child_process ip = CHILD_PROCESS_INIT;
1687        const char *ip_argv[8];
1688
1689        close_pack_index(p);
1690
1691        fclose(preq->packfile);
1692        preq->packfile = NULL;
1693
1694        lst = preq->lst;
1695        while (*lst != p)
1696                lst = &((*lst)->next);
1697        *lst = (*lst)->next;
1698
1699        if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1700                die("BUG: pack tmpfile does not end in .pack.temp?");
1701        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1702
1703        ip_argv[0] = "index-pack";
1704        ip_argv[1] = "-o";
1705        ip_argv[2] = tmp_idx;
1706        ip_argv[3] = preq->tmpfile;
1707        ip_argv[4] = NULL;
1708
1709        ip.argv = ip_argv;
1710        ip.git_cmd = 1;
1711        ip.no_stdin = 1;
1712        ip.no_stdout = 1;
1713
1714        if (run_command(&ip)) {
1715                unlink(preq->tmpfile);
1716                unlink(tmp_idx);
1717                free(tmp_idx);
1718                return -1;
1719        }
1720
1721        unlink(sha1_pack_index_name(p->sha1));
1722
1723        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1724         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1725                free(tmp_idx);
1726                return -1;
1727        }
1728
1729        install_packed_git(p);
1730        free(tmp_idx);
1731        return 0;
1732}
1733
1734struct http_pack_request *new_http_pack_request(
1735        struct packed_git *target, const char *base_url)
1736{
1737        off_t prev_posn = 0;
1738        struct strbuf buf = STRBUF_INIT;
1739        struct http_pack_request *preq;
1740
1741        preq = xcalloc(1, sizeof(*preq));
1742        preq->target = target;
1743
1744        end_url_with_slash(&buf, base_url);
1745        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1746                sha1_to_hex(target->sha1));
1747        preq->url = strbuf_detach(&buf, NULL);
1748
1749        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1750                sha1_pack_name(target->sha1));
1751        preq->packfile = fopen(preq->tmpfile, "a");
1752        if (!preq->packfile) {
1753                error("Unable to open local file %s for pack",
1754                      preq->tmpfile);
1755                goto abort;
1756        }
1757
1758        preq->slot = get_active_slot();
1759        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1760        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1761        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1762        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1763                no_pragma_header);
1764
1765        /*
1766         * If there is data present from a previous transfer attempt,
1767         * resume where it left off
1768         */
1769        prev_posn = ftello(preq->packfile);
1770        if (prev_posn>0) {
1771                if (http_is_verbose)
1772                        fprintf(stderr,
1773                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1774                                sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1775                http_opt_request_remainder(preq->slot->curl, prev_posn);
1776        }
1777
1778        return preq;
1779
1780abort:
1781        free(preq->url);
1782        free(preq);
1783        return NULL;
1784}
1785
1786/* Helpers for fetching objects (loose) */
1787static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1788                               void *data)
1789{
1790        unsigned char expn[4096];
1791        size_t size = eltsize * nmemb;
1792        int posn = 0;
1793        struct http_object_request *freq =
1794                (struct http_object_request *)data;
1795        do {
1796                ssize_t retval = xwrite(freq->localfile,
1797                                        (char *) ptr + posn, size - posn);
1798                if (retval < 0)
1799                        return posn;
1800                posn += retval;
1801        } while (posn < size);
1802
1803        freq->stream.avail_in = size;
1804        freq->stream.next_in = (void *)ptr;
1805        do {
1806                freq->stream.next_out = expn;
1807                freq->stream.avail_out = sizeof(expn);
1808                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1809                git_SHA1_Update(&freq->c, expn,
1810                                sizeof(expn) - freq->stream.avail_out);
1811        } while (freq->stream.avail_in && freq->zret == Z_OK);
1812        return size;
1813}
1814
1815struct http_object_request *new_http_object_request(const char *base_url,
1816        unsigned char *sha1)
1817{
1818        char *hex = sha1_to_hex(sha1);
1819        const char *filename;
1820        char prevfile[PATH_MAX];
1821        int prevlocal;
1822        char prev_buf[PREV_BUF_SIZE];
1823        ssize_t prev_read = 0;
1824        off_t prev_posn = 0;
1825        struct http_object_request *freq;
1826
1827        freq = xcalloc(1, sizeof(*freq));
1828        hashcpy(freq->sha1, sha1);
1829        freq->localfile = -1;
1830
1831        filename = sha1_file_name(sha1);
1832        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1833                 "%s.temp", filename);
1834
1835        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1836        unlink_or_warn(prevfile);
1837        rename(freq->tmpfile, prevfile);
1838        unlink_or_warn(freq->tmpfile);
1839
1840        if (freq->localfile != -1)
1841                error("fd leakage in start: %d", freq->localfile);
1842        freq->localfile = open(freq->tmpfile,
1843                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1844        /*
1845         * This could have failed due to the "lazy directory creation";
1846         * try to mkdir the last path component.
1847         */
1848        if (freq->localfile < 0 && errno == ENOENT) {
1849                char *dir = strrchr(freq->tmpfile, '/');
1850                if (dir) {
1851                        *dir = 0;
1852                        mkdir(freq->tmpfile, 0777);
1853                        *dir = '/';
1854                }
1855                freq->localfile = open(freq->tmpfile,
1856                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1857        }
1858
1859        if (freq->localfile < 0) {
1860                error("Couldn't create temporary file %s: %s",
1861                      freq->tmpfile, strerror(errno));
1862                goto abort;
1863        }
1864
1865        git_inflate_init(&freq->stream);
1866
1867        git_SHA1_Init(&freq->c);
1868
1869        freq->url = get_remote_object_url(base_url, hex, 0);
1870
1871        /*
1872         * If a previous temp file is present, process what was already
1873         * fetched.
1874         */
1875        prevlocal = open(prevfile, O_RDONLY);
1876        if (prevlocal != -1) {
1877                do {
1878                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1879                        if (prev_read>0) {
1880                                if (fwrite_sha1_file(prev_buf,
1881                                                     1,
1882                                                     prev_read,
1883                                                     freq) == prev_read) {
1884                                        prev_posn += prev_read;
1885                                } else {
1886                                        prev_read = -1;
1887                                }
1888                        }
1889                } while (prev_read > 0);
1890                close(prevlocal);
1891        }
1892        unlink_or_warn(prevfile);
1893
1894        /*
1895         * Reset inflate/SHA1 if there was an error reading the previous temp
1896         * file; also rewind to the beginning of the local file.
1897         */
1898        if (prev_read == -1) {
1899                memset(&freq->stream, 0, sizeof(freq->stream));
1900                git_inflate_init(&freq->stream);
1901                git_SHA1_Init(&freq->c);
1902                if (prev_posn>0) {
1903                        prev_posn = 0;
1904                        lseek(freq->localfile, 0, SEEK_SET);
1905                        if (ftruncate(freq->localfile, 0) < 0) {
1906                                error("Couldn't truncate temporary file %s: %s",
1907                                          freq->tmpfile, strerror(errno));
1908                                goto abort;
1909                        }
1910                }
1911        }
1912
1913        freq->slot = get_active_slot();
1914
1915        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1916        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1917        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1918        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1919        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1920
1921        /*
1922         * If we have successfully processed data from a previous fetch
1923         * attempt, only fetch the data we don't already have.
1924         */
1925        if (prev_posn>0) {
1926                if (http_is_verbose)
1927                        fprintf(stderr,
1928                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1929                                hex, (uintmax_t)prev_posn);
1930                http_opt_request_remainder(freq->slot->curl, prev_posn);
1931        }
1932
1933        return freq;
1934
1935abort:
1936        free(freq->url);
1937        free(freq);
1938        return NULL;
1939}
1940
1941void process_http_object_request(struct http_object_request *freq)
1942{
1943        if (freq->slot == NULL)
1944                return;
1945        freq->curl_result = freq->slot->curl_result;
1946        freq->http_code = freq->slot->http_code;
1947        freq->slot = NULL;
1948}
1949
1950int finish_http_object_request(struct http_object_request *freq)
1951{
1952        struct stat st;
1953
1954        close(freq->localfile);
1955        freq->localfile = -1;
1956
1957        process_http_object_request(freq);
1958
1959        if (freq->http_code == 416) {
1960                warning("requested range invalid; we may already have all the data.");
1961        } else if (freq->curl_result != CURLE_OK) {
1962                if (stat(freq->tmpfile, &st) == 0)
1963                        if (st.st_size == 0)
1964                                unlink_or_warn(freq->tmpfile);
1965                return -1;
1966        }
1967
1968        git_inflate_end(&freq->stream);
1969        git_SHA1_Final(freq->real_sha1, &freq->c);
1970        if (freq->zret != Z_STREAM_END) {
1971                unlink_or_warn(freq->tmpfile);
1972                return -1;
1973        }
1974        if (hashcmp(freq->sha1, freq->real_sha1)) {
1975                unlink_or_warn(freq->tmpfile);
1976                return -1;
1977        }
1978        freq->rename =
1979                finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1980
1981        return freq->rename;
1982}
1983
1984void abort_http_object_request(struct http_object_request *freq)
1985{
1986        unlink_or_warn(freq->tmpfile);
1987
1988        release_http_object_request(freq);
1989}
1990
1991void release_http_object_request(struct http_object_request *freq)
1992{
1993        if (freq->localfile != -1) {
1994                close(freq->localfile);
1995                freq->localfile = -1;
1996        }
1997        if (freq->url != NULL) {
1998                free(freq->url);
1999                freq->url = NULL;
2000        }
2001        if (freq->slot != NULL) {
2002                freq->slot->callback_func = NULL;
2003                freq->slot->callback_data = NULL;
2004                release_active_slot(freq->slot);
2005                freq->slot = NULL;
2006        }
2007}