Andrew's git / gitweb.git / http.c
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http.con commit t2019-checkout-ambiguous-ref.sh: depend on C_LOCALE_OUTPUT (6b3d83e)
   1#include "http.h"
   2#include "pack.h"
   3#include "sideband.h"
   4#include "run-command.h"
   5#include "url.h"
   6
   7int data_received;
   8int active_requests;
   9int http_is_verbose;
  10size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  11
  12#if LIBCURL_VERSION_NUM >= 0x070a06
  13#define LIBCURL_CAN_HANDLE_AUTH_ANY
  14#endif
  15
  16static int min_curl_sessions = 1;
  17static int curl_session_count;
  18#ifdef USE_CURL_MULTI
  19static int max_requests = -1;
  20static CURLM *curlm;
  21#endif
  22#ifndef NO_CURL_EASY_DUPHANDLE
  23static CURL *curl_default;
  24#endif
  25
  26#define PREV_BUF_SIZE 4096
  27#define RANGE_HEADER_SIZE 30
  28
  29char curl_errorstr[CURL_ERROR_SIZE];
  30
  31static int curl_ssl_verify = -1;
  32static const char *ssl_cert;
  33#if LIBCURL_VERSION_NUM >= 0x070903
  34static const char *ssl_key;
  35#endif
  36#if LIBCURL_VERSION_NUM >= 0x070908
  37static const char *ssl_capath;
  38#endif
  39static const char *ssl_cainfo;
  40static long curl_low_speed_limit = -1;
  41static long curl_low_speed_time = -1;
  42static int curl_ftp_no_epsv;
  43static const char *curl_http_proxy;
  44static char *user_name, *user_pass;
  45static const char *user_agent;
  46
  47#if LIBCURL_VERSION_NUM >= 0x071700
  48/* Use CURLOPT_KEYPASSWD as is */
  49#elif LIBCURL_VERSION_NUM >= 0x070903
  50#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  51#else
  52#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  53#endif
  54
  55static char *ssl_cert_password;
  56static int ssl_cert_password_required;
  57
  58static struct curl_slist *pragma_header;
  59static struct curl_slist *no_pragma_header;
  60
  61static struct active_request_slot *active_queue_head;
  62
  63size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  64{
  65        size_t size = eltsize * nmemb;
  66        struct buffer *buffer = buffer_;
  67
  68        if (size > buffer->buf.len - buffer->posn)
  69                size = buffer->buf.len - buffer->posn;
  70        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  71        buffer->posn += size;
  72
  73        return size;
  74}
  75
  76#ifndef NO_CURL_IOCTL
  77curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  78{
  79        struct buffer *buffer = clientp;
  80
  81        switch (cmd) {
  82        case CURLIOCMD_NOP:
  83                return CURLIOE_OK;
  84
  85        case CURLIOCMD_RESTARTREAD:
  86                buffer->posn = 0;
  87                return CURLIOE_OK;
  88
  89        default:
  90                return CURLIOE_UNKNOWNCMD;
  91        }
  92}
  93#endif
  94
  95size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  96{
  97        size_t size = eltsize * nmemb;
  98        struct strbuf *buffer = buffer_;
  99
 100        strbuf_add(buffer, ptr, size);
 101        data_received++;
 102        return size;
 103}
 104
 105size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 106{
 107        data_received++;
 108        return eltsize * nmemb;
 109}
 110
 111#ifdef USE_CURL_MULTI
 112static void process_curl_messages(void)
 113{
 114        int num_messages;
 115        struct active_request_slot *slot;
 116        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 117
 118        while (curl_message != NULL) {
 119                if (curl_message->msg == CURLMSG_DONE) {
 120                        int curl_result = curl_message->data.result;
 121                        slot = active_queue_head;
 122                        while (slot != NULL &&
 123                               slot->curl != curl_message->easy_handle)
 124                                slot = slot->next;
 125                        if (slot != NULL) {
 126                                curl_multi_remove_handle(curlm, slot->curl);
 127                                slot->curl_result = curl_result;
 128                                finish_active_slot(slot);
 129                        } else {
 130                                fprintf(stderr, "Received DONE message for unknown request!\n");
 131                        }
 132                } else {
 133                        fprintf(stderr, "Unknown CURL message received: %d\n",
 134                                (int)curl_message->msg);
 135                }
 136                curl_message = curl_multi_info_read(curlm, &num_messages);
 137        }
 138}
 139#endif
 140
 141static int http_options(const char *var, const char *value, void *cb)
 142{
 143        if (!strcmp("http.sslverify", var)) {
 144                curl_ssl_verify = git_config_bool(var, value);
 145                return 0;
 146        }
 147        if (!strcmp("http.sslcert", var))
 148                return git_config_string(&ssl_cert, var, value);
 149#if LIBCURL_VERSION_NUM >= 0x070903
 150        if (!strcmp("http.sslkey", var))
 151                return git_config_string(&ssl_key, var, value);
 152#endif
 153#if LIBCURL_VERSION_NUM >= 0x070908
 154        if (!strcmp("http.sslcapath", var))
 155                return git_config_string(&ssl_capath, var, value);
 156#endif
 157        if (!strcmp("http.sslcainfo", var))
 158                return git_config_string(&ssl_cainfo, var, value);
 159        if (!strcmp("http.sslcertpasswordprotected", var)) {
 160                if (git_config_bool(var, value))
 161                        ssl_cert_password_required = 1;
 162                return 0;
 163        }
 164        if (!strcmp("http.minsessions", var)) {
 165                min_curl_sessions = git_config_int(var, value);
 166#ifndef USE_CURL_MULTI
 167                if (min_curl_sessions > 1)
 168                        min_curl_sessions = 1;
 169#endif
 170                return 0;
 171        }
 172#ifdef USE_CURL_MULTI
 173        if (!strcmp("http.maxrequests", var)) {
 174                max_requests = git_config_int(var, value);
 175                return 0;
 176        }
 177#endif
 178        if (!strcmp("http.lowspeedlimit", var)) {
 179                curl_low_speed_limit = (long)git_config_int(var, value);
 180                return 0;
 181        }
 182        if (!strcmp("http.lowspeedtime", var)) {
 183                curl_low_speed_time = (long)git_config_int(var, value);
 184                return 0;
 185        }
 186
 187        if (!strcmp("http.noepsv", var)) {
 188                curl_ftp_no_epsv = git_config_bool(var, value);
 189                return 0;
 190        }
 191        if (!strcmp("http.proxy", var))
 192                return git_config_string(&curl_http_proxy, var, value);
 193
 194        if (!strcmp("http.postbuffer", var)) {
 195                http_post_buffer = git_config_int(var, value);
 196                if (http_post_buffer < LARGE_PACKET_MAX)
 197                        http_post_buffer = LARGE_PACKET_MAX;
 198                return 0;
 199        }
 200
 201        if (!strcmp("http.useragent", var))
 202                return git_config_string(&user_agent, var, value);
 203
 204        /* Fall back on the default ones */
 205        return git_default_config(var, value, cb);
 206}
 207
 208static void init_curl_http_auth(CURL *result)
 209{
 210        if (user_name) {
 211                struct strbuf up = STRBUF_INIT;
 212                if (!user_pass)
 213                        user_pass = xstrdup(git_getpass("Password: "));
 214                strbuf_addf(&up, "%s:%s", user_name, user_pass);
 215                curl_easy_setopt(result, CURLOPT_USERPWD,
 216                                 strbuf_detach(&up, NULL));
 217        }
 218}
 219
 220static int has_cert_password(void)
 221{
 222        if (ssl_cert_password != NULL)
 223                return 1;
 224        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 225                return 0;
 226        /* Only prompt the user once. */
 227        ssl_cert_password_required = -1;
 228        ssl_cert_password = git_getpass("Certificate Password: ");
 229        if (ssl_cert_password != NULL) {
 230                ssl_cert_password = xstrdup(ssl_cert_password);
 231                return 1;
 232        } else
 233                return 0;
 234}
 235
 236static CURL *get_curl_handle(void)
 237{
 238        CURL *result = curl_easy_init();
 239
 240        if (!curl_ssl_verify) {
 241                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 242                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 243        } else {
 244                /* Verify authenticity of the peer's certificate */
 245                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 246                /* The name in the cert must match whom we tried to connect */
 247                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 248        }
 249
 250#if LIBCURL_VERSION_NUM >= 0x070907
 251        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 252#endif
 253#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 254        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 255#endif
 256
 257        init_curl_http_auth(result);
 258
 259        if (ssl_cert != NULL)
 260                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 261        if (has_cert_password())
 262                curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
 263#if LIBCURL_VERSION_NUM >= 0x070903
 264        if (ssl_key != NULL)
 265                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 266#endif
 267#if LIBCURL_VERSION_NUM >= 0x070908
 268        if (ssl_capath != NULL)
 269                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 270#endif
 271        if (ssl_cainfo != NULL)
 272                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 273        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 274
 275        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 276                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 277                                 curl_low_speed_limit);
 278                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 279                                 curl_low_speed_time);
 280        }
 281
 282        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 283#if LIBCURL_VERSION_NUM >= 0x071301
 284        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 285#elif LIBCURL_VERSION_NUM >= 0x071101
 286        curl_easy_setopt(result, CURLOPT_POST301, 1);
 287#endif
 288
 289        if (getenv("GIT_CURL_VERBOSE"))
 290                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 291
 292        curl_easy_setopt(result, CURLOPT_USERAGENT,
 293                user_agent ? user_agent : GIT_HTTP_USER_AGENT);
 294
 295        if (curl_ftp_no_epsv)
 296                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 297
 298        if (curl_http_proxy)
 299                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 300
 301        return result;
 302}
 303
 304static void http_auth_init(const char *url)
 305{
 306        char *at, *colon, *cp, *slash, *decoded;
 307        int len;
 308
 309        cp = strstr(url, "://");
 310        if (!cp)
 311                return;
 312
 313        /*
 314         * Ok, the URL looks like "proto://something".  Which one?
 315         * "proto://<user>:<pass>@<host>/...",
 316         * "proto://<user>@<host>/...", or just
 317         * "proto://<host>/..."?
 318         */
 319        cp += 3;
 320        at = strchr(cp, '@');
 321        colon = strchr(cp, ':');
 322        slash = strchrnul(cp, '/');
 323        if (!at || slash <= at)
 324                return; /* No credentials */
 325        if (!colon || at <= colon) {
 326                /* Only username */
 327                len = at - cp;
 328                user_name = xmalloc(len + 1);
 329                memcpy(user_name, cp, len);
 330                user_name[len] = '\0';
 331                decoded = url_decode(user_name);
 332                free(user_name);
 333                user_name = decoded;
 334                user_pass = NULL;
 335        } else {
 336                len = colon - cp;
 337                user_name = xmalloc(len + 1);
 338                memcpy(user_name, cp, len);
 339                user_name[len] = '\0';
 340                decoded = url_decode(user_name);
 341                free(user_name);
 342                user_name = decoded;
 343                len = at - (colon + 1);
 344                user_pass = xmalloc(len + 1);
 345                memcpy(user_pass, colon + 1, len);
 346                user_pass[len] = '\0';
 347                decoded = url_decode(user_pass);
 348                free(user_pass);
 349                user_pass = decoded;
 350        }
 351}
 352
 353static void set_from_env(const char **var, const char *envname)
 354{
 355        const char *val = getenv(envname);
 356        if (val)
 357                *var = val;
 358}
 359
 360void http_init(struct remote *remote)
 361{
 362        char *low_speed_limit;
 363        char *low_speed_time;
 364
 365        http_is_verbose = 0;
 366
 367        git_config(http_options, NULL);
 368
 369        curl_global_init(CURL_GLOBAL_ALL);
 370
 371        if (remote && remote->http_proxy)
 372                curl_http_proxy = xstrdup(remote->http_proxy);
 373
 374        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 375        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 376
 377#ifdef USE_CURL_MULTI
 378        {
 379                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 380                if (http_max_requests != NULL)
 381                        max_requests = atoi(http_max_requests);
 382        }
 383
 384        curlm = curl_multi_init();
 385        if (curlm == NULL) {
 386                fprintf(stderr, "Error creating curl multi handle.\n");
 387                exit(1);
 388        }
 389#endif
 390
 391        if (getenv("GIT_SSL_NO_VERIFY"))
 392                curl_ssl_verify = 0;
 393
 394        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 395#if LIBCURL_VERSION_NUM >= 0x070903
 396        set_from_env(&ssl_key, "GIT_SSL_KEY");
 397#endif
 398#if LIBCURL_VERSION_NUM >= 0x070908
 399        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 400#endif
 401        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 402
 403        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 404
 405        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 406        if (low_speed_limit != NULL)
 407                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 408        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 409        if (low_speed_time != NULL)
 410                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 411
 412        if (curl_ssl_verify == -1)
 413                curl_ssl_verify = 1;
 414
 415        curl_session_count = 0;
 416#ifdef USE_CURL_MULTI
 417        if (max_requests < 1)
 418                max_requests = DEFAULT_MAX_REQUESTS;
 419#endif
 420
 421        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 422                curl_ftp_no_epsv = 1;
 423
 424        if (remote && remote->url && remote->url[0]) {
 425                http_auth_init(remote->url[0]);
 426                if (!ssl_cert_password_required &&
 427                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 428                    !prefixcmp(remote->url[0], "https://"))
 429                        ssl_cert_password_required = 1;
 430        }
 431
 432#ifndef NO_CURL_EASY_DUPHANDLE
 433        curl_default = get_curl_handle();
 434#endif
 435}
 436
 437void http_cleanup(void)
 438{
 439        struct active_request_slot *slot = active_queue_head;
 440
 441        while (slot != NULL) {
 442                struct active_request_slot *next = slot->next;
 443                if (slot->curl != NULL) {
 444#ifdef USE_CURL_MULTI
 445                        curl_multi_remove_handle(curlm, slot->curl);
 446#endif
 447                        curl_easy_cleanup(slot->curl);
 448                }
 449                free(slot);
 450                slot = next;
 451        }
 452        active_queue_head = NULL;
 453
 454#ifndef NO_CURL_EASY_DUPHANDLE
 455        curl_easy_cleanup(curl_default);
 456#endif
 457
 458#ifdef USE_CURL_MULTI
 459        curl_multi_cleanup(curlm);
 460#endif
 461        curl_global_cleanup();
 462
 463        curl_slist_free_all(pragma_header);
 464        pragma_header = NULL;
 465
 466        curl_slist_free_all(no_pragma_header);
 467        no_pragma_header = NULL;
 468
 469        if (curl_http_proxy) {
 470                free((void *)curl_http_proxy);
 471                curl_http_proxy = NULL;
 472        }
 473
 474        if (ssl_cert_password != NULL) {
 475                memset(ssl_cert_password, 0, strlen(ssl_cert_password));
 476                free(ssl_cert_password);
 477                ssl_cert_password = NULL;
 478        }
 479        ssl_cert_password_required = 0;
 480}
 481
 482struct active_request_slot *get_active_slot(void)
 483{
 484        struct active_request_slot *slot = active_queue_head;
 485        struct active_request_slot *newslot;
 486
 487#ifdef USE_CURL_MULTI
 488        int num_transfers;
 489
 490        /* Wait for a slot to open up if the queue is full */
 491        while (active_requests >= max_requests) {
 492                curl_multi_perform(curlm, &num_transfers);
 493                if (num_transfers < active_requests)
 494                        process_curl_messages();
 495        }
 496#endif
 497
 498        while (slot != NULL && slot->in_use)
 499                slot = slot->next;
 500
 501        if (slot == NULL) {
 502                newslot = xmalloc(sizeof(*newslot));
 503                newslot->curl = NULL;
 504                newslot->in_use = 0;
 505                newslot->next = NULL;
 506
 507                slot = active_queue_head;
 508                if (slot == NULL) {
 509                        active_queue_head = newslot;
 510                } else {
 511                        while (slot->next != NULL)
 512                                slot = slot->next;
 513                        slot->next = newslot;
 514                }
 515                slot = newslot;
 516        }
 517
 518        if (slot->curl == NULL) {
 519#ifdef NO_CURL_EASY_DUPHANDLE
 520                slot->curl = get_curl_handle();
 521#else
 522                slot->curl = curl_easy_duphandle(curl_default);
 523#endif
 524                curl_session_count++;
 525        }
 526
 527        active_requests++;
 528        slot->in_use = 1;
 529        slot->local = NULL;
 530        slot->results = NULL;
 531        slot->finished = NULL;
 532        slot->callback_data = NULL;
 533        slot->callback_func = NULL;
 534        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 535        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 536        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 537        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 538        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 539        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 540        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 541
 542        return slot;
 543}
 544
 545int start_active_slot(struct active_request_slot *slot)
 546{
 547#ifdef USE_CURL_MULTI
 548        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 549        int num_transfers;
 550
 551        if (curlm_result != CURLM_OK &&
 552            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 553                active_requests--;
 554                slot->in_use = 0;
 555                return 0;
 556        }
 557
 558        /*
 559         * We know there must be something to do, since we just added
 560         * something.
 561         */
 562        curl_multi_perform(curlm, &num_transfers);
 563#endif
 564        return 1;
 565}
 566
 567#ifdef USE_CURL_MULTI
 568struct fill_chain {
 569        void *data;
 570        int (*fill)(void *);
 571        struct fill_chain *next;
 572};
 573
 574static struct fill_chain *fill_cfg;
 575
 576void add_fill_function(void *data, int (*fill)(void *))
 577{
 578        struct fill_chain *new = xmalloc(sizeof(*new));
 579        struct fill_chain **linkp = &fill_cfg;
 580        new->data = data;
 581        new->fill = fill;
 582        new->next = NULL;
 583        while (*linkp)
 584                linkp = &(*linkp)->next;
 585        *linkp = new;
 586}
 587
 588void fill_active_slots(void)
 589{
 590        struct active_request_slot *slot = active_queue_head;
 591
 592        while (active_requests < max_requests) {
 593                struct fill_chain *fill;
 594                for (fill = fill_cfg; fill; fill = fill->next)
 595                        if (fill->fill(fill->data))
 596                                break;
 597
 598                if (!fill)
 599                        break;
 600        }
 601
 602        while (slot != NULL) {
 603                if (!slot->in_use && slot->curl != NULL
 604                        && curl_session_count > min_curl_sessions) {
 605                        curl_easy_cleanup(slot->curl);
 606                        slot->curl = NULL;
 607                        curl_session_count--;
 608                }
 609                slot = slot->next;
 610        }
 611}
 612
 613void step_active_slots(void)
 614{
 615        int num_transfers;
 616        CURLMcode curlm_result;
 617
 618        do {
 619                curlm_result = curl_multi_perform(curlm, &num_transfers);
 620        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 621        if (num_transfers < active_requests) {
 622                process_curl_messages();
 623                fill_active_slots();
 624        }
 625}
 626#endif
 627
 628void run_active_slot(struct active_request_slot *slot)
 629{
 630#ifdef USE_CURL_MULTI
 631        long last_pos = 0;
 632        long current_pos;
 633        fd_set readfds;
 634        fd_set writefds;
 635        fd_set excfds;
 636        int max_fd;
 637        struct timeval select_timeout;
 638        int finished = 0;
 639
 640        slot->finished = &finished;
 641        while (!finished) {
 642                data_received = 0;
 643                step_active_slots();
 644
 645                if (!data_received && slot->local != NULL) {
 646                        current_pos = ftell(slot->local);
 647                        if (current_pos > last_pos)
 648                                data_received++;
 649                        last_pos = current_pos;
 650                }
 651
 652                if (slot->in_use && !data_received) {
 653                        max_fd = 0;
 654                        FD_ZERO(&readfds);
 655                        FD_ZERO(&writefds);
 656                        FD_ZERO(&excfds);
 657                        select_timeout.tv_sec = 0;
 658                        select_timeout.tv_usec = 50000;
 659                        select(max_fd, &readfds, &writefds,
 660                               &excfds, &select_timeout);
 661                }
 662        }
 663#else
 664        while (slot->in_use) {
 665                slot->curl_result = curl_easy_perform(slot->curl);
 666                finish_active_slot(slot);
 667        }
 668#endif
 669}
 670
 671static void closedown_active_slot(struct active_request_slot *slot)
 672{
 673        active_requests--;
 674        slot->in_use = 0;
 675}
 676
 677static void release_active_slot(struct active_request_slot *slot)
 678{
 679        closedown_active_slot(slot);
 680        if (slot->curl && curl_session_count > min_curl_sessions) {
 681#ifdef USE_CURL_MULTI
 682                curl_multi_remove_handle(curlm, slot->curl);
 683#endif
 684                curl_easy_cleanup(slot->curl);
 685                slot->curl = NULL;
 686                curl_session_count--;
 687        }
 688#ifdef USE_CURL_MULTI
 689        fill_active_slots();
 690#endif
 691}
 692
 693void finish_active_slot(struct active_request_slot *slot)
 694{
 695        closedown_active_slot(slot);
 696        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 697
 698        if (slot->finished != NULL)
 699                (*slot->finished) = 1;
 700
 701        /* Store slot results so they can be read after the slot is reused */
 702        if (slot->results != NULL) {
 703                slot->results->curl_result = slot->curl_result;
 704                slot->results->http_code = slot->http_code;
 705        }
 706
 707        /* Run callback if appropriate */
 708        if (slot->callback_func != NULL)
 709                slot->callback_func(slot->callback_data);
 710}
 711
 712void finish_all_active_slots(void)
 713{
 714        struct active_request_slot *slot = active_queue_head;
 715
 716        while (slot != NULL)
 717                if (slot->in_use) {
 718                        run_active_slot(slot);
 719                        slot = active_queue_head;
 720                } else {
 721                        slot = slot->next;
 722                }
 723}
 724
 725/* Helpers for modifying and creating URLs */
 726static inline int needs_quote(int ch)
 727{
 728        if (((ch >= 'A') && (ch <= 'Z'))
 729                        || ((ch >= 'a') && (ch <= 'z'))
 730                        || ((ch >= '0') && (ch <= '9'))
 731                        || (ch == '/')
 732                        || (ch == '-')
 733                        || (ch == '.'))
 734                return 0;
 735        return 1;
 736}
 737
 738static inline int hex(int v)
 739{
 740        if (v < 10)
 741                return '0' + v;
 742        else
 743                return 'A' + v - 10;
 744}
 745
 746static char *quote_ref_url(const char *base, const char *ref)
 747{
 748        struct strbuf buf = STRBUF_INIT;
 749        const char *cp;
 750        int ch;
 751
 752        end_url_with_slash(&buf, base);
 753
 754        for (cp = ref; (ch = *cp) != 0; cp++)
 755                if (needs_quote(ch))
 756                        strbuf_addf(&buf, "%%%02x", ch);
 757                else
 758                        strbuf_addch(&buf, *cp);
 759
 760        return strbuf_detach(&buf, NULL);
 761}
 762
 763void append_remote_object_url(struct strbuf *buf, const char *url,
 764                              const char *hex,
 765                              int only_two_digit_prefix)
 766{
 767        end_url_with_slash(buf, url);
 768
 769        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 770        if (!only_two_digit_prefix)
 771                strbuf_addf(buf, "%s", hex+2);
 772}
 773
 774char *get_remote_object_url(const char *url, const char *hex,
 775                            int only_two_digit_prefix)
 776{
 777        struct strbuf buf = STRBUF_INIT;
 778        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 779        return strbuf_detach(&buf, NULL);
 780}
 781
 782/* http_request() targets */
 783#define HTTP_REQUEST_STRBUF     0
 784#define HTTP_REQUEST_FILE       1
 785
 786static int http_request(const char *url, void *result, int target, int options)
 787{
 788        struct active_request_slot *slot;
 789        struct slot_results results;
 790        struct curl_slist *headers = NULL;
 791        struct strbuf buf = STRBUF_INIT;
 792        int ret;
 793
 794        slot = get_active_slot();
 795        slot->results = &results;
 796        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 797
 798        if (result == NULL) {
 799                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 800        } else {
 801                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 802                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 803
 804                if (target == HTTP_REQUEST_FILE) {
 805                        long posn = ftell(result);
 806                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 807                                         fwrite);
 808                        if (posn > 0) {
 809                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 810                                headers = curl_slist_append(headers, buf.buf);
 811                                strbuf_reset(&buf);
 812                        }
 813                        slot->local = result;
 814                } else
 815                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 816                                         fwrite_buffer);
 817        }
 818
 819        strbuf_addstr(&buf, "Pragma:");
 820        if (options & HTTP_NO_CACHE)
 821                strbuf_addstr(&buf, " no-cache");
 822
 823        headers = curl_slist_append(headers, buf.buf);
 824
 825        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 826        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 827
 828        if (start_active_slot(slot)) {
 829                run_active_slot(slot);
 830                if (results.curl_result == CURLE_OK)
 831                        ret = HTTP_OK;
 832                else if (missing_target(&results))
 833                        ret = HTTP_MISSING_TARGET;
 834                else if (results.http_code == 401) {
 835                        if (user_name) {
 836                                ret = HTTP_NOAUTH;
 837                        } else {
 838                                /*
 839                                 * git_getpass is needed here because its very likely stdin/stdout are
 840                                 * pipes to our parent process.  So we instead need to use /dev/tty,
 841                                 * but that is non-portable.  Using git_getpass() can at least be stubbed
 842                                 * on other platforms with a different implementation if/when necessary.
 843                                 */
 844                                user_name = xstrdup(git_getpass("Username: "));
 845                                init_curl_http_auth(slot->curl);
 846                                ret = HTTP_REAUTH;
 847                        }
 848                } else
 849                        ret = HTTP_ERROR;
 850        } else {
 851                error("Unable to start HTTP request for %s", url);
 852                ret = HTTP_START_FAILED;
 853        }
 854
 855        slot->local = NULL;
 856        curl_slist_free_all(headers);
 857        strbuf_release(&buf);
 858
 859        return ret;
 860}
 861
 862int http_get_strbuf(const char *url, struct strbuf *result, int options)
 863{
 864        int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
 865        if (http_ret == HTTP_REAUTH) {
 866                http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
 867        }
 868        return http_ret;
 869}
 870
 871/*
 872 * Downloads an url and stores the result in the given file.
 873 *
 874 * If a previous interrupted download is detected (i.e. a previous temporary
 875 * file is still around) the download is resumed.
 876 */
 877static int http_get_file(const char *url, const char *filename, int options)
 878{
 879        int ret;
 880        struct strbuf tmpfile = STRBUF_INIT;
 881        FILE *result;
 882
 883        strbuf_addf(&tmpfile, "%s.temp", filename);
 884        result = fopen(tmpfile.buf, "a");
 885        if (! result) {
 886                error("Unable to open local file %s", tmpfile.buf);
 887                ret = HTTP_ERROR;
 888                goto cleanup;
 889        }
 890
 891        ret = http_request(url, result, HTTP_REQUEST_FILE, options);
 892        fclose(result);
 893
 894        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 895                ret = HTTP_ERROR;
 896cleanup:
 897        strbuf_release(&tmpfile);
 898        return ret;
 899}
 900
 901int http_error(const char *url, int ret)
 902{
 903        /* http_request has already handled HTTP_START_FAILED. */
 904        if (ret != HTTP_START_FAILED)
 905                error("%s while accessing %s\n", curl_errorstr, url);
 906
 907        return ret;
 908}
 909
 910int http_fetch_ref(const char *base, struct ref *ref)
 911{
 912        char *url;
 913        struct strbuf buffer = STRBUF_INIT;
 914        int ret = -1;
 915
 916        url = quote_ref_url(base, ref->name);
 917        if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 918                strbuf_rtrim(&buffer);
 919                if (buffer.len == 40)
 920                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 921                else if (!prefixcmp(buffer.buf, "ref: ")) {
 922                        ref->symref = xstrdup(buffer.buf + 5);
 923                        ret = 0;
 924                }
 925        }
 926
 927        strbuf_release(&buffer);
 928        free(url);
 929        return ret;
 930}
 931
 932/* Helpers for fetching packs */
 933static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 934{
 935        char *url, *tmp;
 936        struct strbuf buf = STRBUF_INIT;
 937
 938        if (http_is_verbose)
 939                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 940
 941        end_url_with_slash(&buf, base_url);
 942        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 943        url = strbuf_detach(&buf, NULL);
 944
 945        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 946        tmp = strbuf_detach(&buf, NULL);
 947
 948        if (http_get_file(url, tmp, 0) != HTTP_OK) {
 949                error("Unable to get pack index %s\n", url);
 950                free(tmp);
 951                tmp = NULL;
 952        }
 953
 954        free(url);
 955        return tmp;
 956}
 957
 958static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 959        unsigned char *sha1, const char *base_url)
 960{
 961        struct packed_git *new_pack;
 962        char *tmp_idx = NULL;
 963        int ret;
 964
 965        if (has_pack_index(sha1)) {
 966                new_pack = parse_pack_index(sha1, NULL);
 967                if (!new_pack)
 968                        return -1; /* parse_pack_index() already issued error message */
 969                goto add_pack;
 970        }
 971
 972        tmp_idx = fetch_pack_index(sha1, base_url);
 973        if (!tmp_idx)
 974                return -1;
 975
 976        new_pack = parse_pack_index(sha1, tmp_idx);
 977        if (!new_pack) {
 978                unlink(tmp_idx);
 979                free(tmp_idx);
 980
 981                return -1; /* parse_pack_index() already issued error message */
 982        }
 983
 984        ret = verify_pack_index(new_pack);
 985        if (!ret) {
 986                close_pack_index(new_pack);
 987                ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
 988        }
 989        free(tmp_idx);
 990        if (ret)
 991                return -1;
 992
 993add_pack:
 994        new_pack->next = *packs_head;
 995        *packs_head = new_pack;
 996        return 0;
 997}
 998
 999int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1000{
1001        int ret = 0, i = 0;
1002        char *url, *data;
1003        struct strbuf buf = STRBUF_INIT;
1004        unsigned char sha1[20];
1005
1006        end_url_with_slash(&buf, base_url);
1007        strbuf_addstr(&buf, "objects/info/packs");
1008        url = strbuf_detach(&buf, NULL);
1009
1010        ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1011        if (ret != HTTP_OK)
1012                goto cleanup;
1013
1014        data = buf.buf;
1015        while (i < buf.len) {
1016                switch (data[i]) {
1017                case 'P':
1018                        i++;
1019                        if (i + 52 <= buf.len &&
1020                            !prefixcmp(data + i, " pack-") &&
1021                            !prefixcmp(data + i + 46, ".pack\n")) {
1022                                get_sha1_hex(data + i + 6, sha1);
1023                                fetch_and_setup_pack_index(packs_head, sha1,
1024                                                      base_url);
1025                                i += 51;
1026                                break;
1027                        }
1028                default:
1029                        while (i < buf.len && data[i] != '\n')
1030                                i++;
1031                }
1032                i++;
1033        }
1034
1035cleanup:
1036        free(url);
1037        return ret;
1038}
1039
1040void release_http_pack_request(struct http_pack_request *preq)
1041{
1042        if (preq->packfile != NULL) {
1043                fclose(preq->packfile);
1044                preq->packfile = NULL;
1045                preq->slot->local = NULL;
1046        }
1047        if (preq->range_header != NULL) {
1048                curl_slist_free_all(preq->range_header);
1049                preq->range_header = NULL;
1050        }
1051        preq->slot = NULL;
1052        free(preq->url);
1053}
1054
1055int finish_http_pack_request(struct http_pack_request *preq)
1056{
1057        struct packed_git **lst;
1058        struct packed_git *p = preq->target;
1059        char *tmp_idx;
1060        struct child_process ip;
1061        const char *ip_argv[8];
1062
1063        close_pack_index(p);
1064
1065        fclose(preq->packfile);
1066        preq->packfile = NULL;
1067        preq->slot->local = NULL;
1068
1069        lst = preq->lst;
1070        while (*lst != p)
1071                lst = &((*lst)->next);
1072        *lst = (*lst)->next;
1073
1074        tmp_idx = xstrdup(preq->tmpfile);
1075        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1076               ".idx.temp");
1077
1078        ip_argv[0] = "index-pack";
1079        ip_argv[1] = "-o";
1080        ip_argv[2] = tmp_idx;
1081        ip_argv[3] = preq->tmpfile;
1082        ip_argv[4] = NULL;
1083
1084        memset(&ip, 0, sizeof(ip));
1085        ip.argv = ip_argv;
1086        ip.git_cmd = 1;
1087        ip.no_stdin = 1;
1088        ip.no_stdout = 1;
1089
1090        if (run_command(&ip)) {
1091                unlink(preq->tmpfile);
1092                unlink(tmp_idx);
1093                free(tmp_idx);
1094                return -1;
1095        }
1096
1097        unlink(sha1_pack_index_name(p->sha1));
1098
1099        if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1100         || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1101                free(tmp_idx);
1102                return -1;
1103        }
1104
1105        install_packed_git(p);
1106        free(tmp_idx);
1107        return 0;
1108}
1109
1110struct http_pack_request *new_http_pack_request(
1111        struct packed_git *target, const char *base_url)
1112{
1113        long prev_posn = 0;
1114        char range[RANGE_HEADER_SIZE];
1115        struct strbuf buf = STRBUF_INIT;
1116        struct http_pack_request *preq;
1117
1118        preq = xmalloc(sizeof(*preq));
1119        preq->target = target;
1120        preq->range_header = NULL;
1121
1122        end_url_with_slash(&buf, base_url);
1123        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1124                sha1_to_hex(target->sha1));
1125        preq->url = strbuf_detach(&buf, NULL);
1126
1127        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1128                sha1_pack_name(target->sha1));
1129        preq->packfile = fopen(preq->tmpfile, "a");
1130        if (!preq->packfile) {
1131                error("Unable to open local file %s for pack",
1132                      preq->tmpfile);
1133                goto abort;
1134        }
1135
1136        preq->slot = get_active_slot();
1137        preq->slot->local = preq->packfile;
1138        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1139        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1140        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1141        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1142                no_pragma_header);
1143
1144        /*
1145         * If there is data present from a previous transfer attempt,
1146         * resume where it left off
1147         */
1148        prev_posn = ftell(preq->packfile);
1149        if (prev_posn>0) {
1150                if (http_is_verbose)
1151                        fprintf(stderr,
1152                                "Resuming fetch of pack %s at byte %ld\n",
1153                                sha1_to_hex(target->sha1), prev_posn);
1154                sprintf(range, "Range: bytes=%ld-", prev_posn);
1155                preq->range_header = curl_slist_append(NULL, range);
1156                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1157                        preq->range_header);
1158        }
1159
1160        return preq;
1161
1162abort:
1163        free(preq->url);
1164        free(preq);
1165        return NULL;
1166}
1167
1168/* Helpers for fetching objects (loose) */
1169static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1170                               void *data)
1171{
1172        unsigned char expn[4096];
1173        size_t size = eltsize * nmemb;
1174        int posn = 0;
1175        struct http_object_request *freq =
1176                (struct http_object_request *)data;
1177        do {
1178                ssize_t retval = xwrite(freq->localfile,
1179                                        (char *) ptr + posn, size - posn);
1180                if (retval < 0)
1181                        return posn;
1182                posn += retval;
1183        } while (posn < size);
1184
1185        freq->stream.avail_in = size;
1186        freq->stream.next_in = ptr;
1187        do {
1188                freq->stream.next_out = expn;
1189                freq->stream.avail_out = sizeof(expn);
1190                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1191                git_SHA1_Update(&freq->c, expn,
1192                                sizeof(expn) - freq->stream.avail_out);
1193        } while (freq->stream.avail_in && freq->zret == Z_OK);
1194        data_received++;
1195        return size;
1196}
1197
1198struct http_object_request *new_http_object_request(const char *base_url,
1199        unsigned char *sha1)
1200{
1201        char *hex = sha1_to_hex(sha1);
1202        char *filename;
1203        char prevfile[PATH_MAX];
1204        int prevlocal;
1205        unsigned char prev_buf[PREV_BUF_SIZE];
1206        ssize_t prev_read = 0;
1207        long prev_posn = 0;
1208        char range[RANGE_HEADER_SIZE];
1209        struct curl_slist *range_header = NULL;
1210        struct http_object_request *freq;
1211
1212        freq = xmalloc(sizeof(*freq));
1213        hashcpy(freq->sha1, sha1);
1214        freq->localfile = -1;
1215
1216        filename = sha1_file_name(sha1);
1217        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1218                 "%s.temp", filename);
1219
1220        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1221        unlink_or_warn(prevfile);
1222        rename(freq->tmpfile, prevfile);
1223        unlink_or_warn(freq->tmpfile);
1224
1225        if (freq->localfile != -1)
1226                error("fd leakage in start: %d", freq->localfile);
1227        freq->localfile = open(freq->tmpfile,
1228                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1229        /*
1230         * This could have failed due to the "lazy directory creation";
1231         * try to mkdir the last path component.
1232         */
1233        if (freq->localfile < 0 && errno == ENOENT) {
1234                char *dir = strrchr(freq->tmpfile, '/');
1235                if (dir) {
1236                        *dir = 0;
1237                        mkdir(freq->tmpfile, 0777);
1238                        *dir = '/';
1239                }
1240                freq->localfile = open(freq->tmpfile,
1241                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1242        }
1243
1244        if (freq->localfile < 0) {
1245                error("Couldn't create temporary file %s: %s",
1246                      freq->tmpfile, strerror(errno));
1247                goto abort;
1248        }
1249
1250        memset(&freq->stream, 0, sizeof(freq->stream));
1251
1252        git_inflate_init(&freq->stream);
1253
1254        git_SHA1_Init(&freq->c);
1255
1256        freq->url = get_remote_object_url(base_url, hex, 0);
1257
1258        /*
1259         * If a previous temp file is present, process what was already
1260         * fetched.
1261         */
1262        prevlocal = open(prevfile, O_RDONLY);
1263        if (prevlocal != -1) {
1264                do {
1265                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1266                        if (prev_read>0) {
1267                                if (fwrite_sha1_file(prev_buf,
1268                                                     1,
1269                                                     prev_read,
1270                                                     freq) == prev_read) {
1271                                        prev_posn += prev_read;
1272                                } else {
1273                                        prev_read = -1;
1274                                }
1275                        }
1276                } while (prev_read > 0);
1277                close(prevlocal);
1278        }
1279        unlink_or_warn(prevfile);
1280
1281        /*
1282         * Reset inflate/SHA1 if there was an error reading the previous temp
1283         * file; also rewind to the beginning of the local file.
1284         */
1285        if (prev_read == -1) {
1286                memset(&freq->stream, 0, sizeof(freq->stream));
1287                git_inflate_init(&freq->stream);
1288                git_SHA1_Init(&freq->c);
1289                if (prev_posn>0) {
1290                        prev_posn = 0;
1291                        lseek(freq->localfile, 0, SEEK_SET);
1292                        if (ftruncate(freq->localfile, 0) < 0) {
1293                                error("Couldn't truncate temporary file %s: %s",
1294                                          freq->tmpfile, strerror(errno));
1295                                goto abort;
1296                        }
1297                }
1298        }
1299
1300        freq->slot = get_active_slot();
1301
1302        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1303        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1304        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1305        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1306        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1307
1308        /*
1309         * If we have successfully processed data from a previous fetch
1310         * attempt, only fetch the data we don't already have.
1311         */
1312        if (prev_posn>0) {
1313                if (http_is_verbose)
1314                        fprintf(stderr,
1315                                "Resuming fetch of object %s at byte %ld\n",
1316                                hex, prev_posn);
1317                sprintf(range, "Range: bytes=%ld-", prev_posn);
1318                range_header = curl_slist_append(range_header, range);
1319                curl_easy_setopt(freq->slot->curl,
1320                                 CURLOPT_HTTPHEADER, range_header);
1321        }
1322
1323        return freq;
1324
1325abort:
1326        free(filename);
1327        free(freq->url);
1328        free(freq);
1329        return NULL;
1330}
1331
1332void process_http_object_request(struct http_object_request *freq)
1333{
1334        if (freq->slot == NULL)
1335                return;
1336        freq->curl_result = freq->slot->curl_result;
1337        freq->http_code = freq->slot->http_code;
1338        freq->slot = NULL;
1339}
1340
1341int finish_http_object_request(struct http_object_request *freq)
1342{
1343        struct stat st;
1344
1345        close(freq->localfile);
1346        freq->localfile = -1;
1347
1348        process_http_object_request(freq);
1349
1350        if (freq->http_code == 416) {
1351                warning("requested range invalid; we may already have all the data.");
1352        } else if (freq->curl_result != CURLE_OK) {
1353                if (stat(freq->tmpfile, &st) == 0)
1354                        if (st.st_size == 0)
1355                                unlink_or_warn(freq->tmpfile);
1356                return -1;
1357        }
1358
1359        git_inflate_end(&freq->stream);
1360        git_SHA1_Final(freq->real_sha1, &freq->c);
1361        if (freq->zret != Z_STREAM_END) {
1362                unlink_or_warn(freq->tmpfile);
1363                return -1;
1364        }
1365        if (hashcmp(freq->sha1, freq->real_sha1)) {
1366                unlink_or_warn(freq->tmpfile);
1367                return -1;
1368        }
1369        freq->rename =
1370                move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1371
1372        return freq->rename;
1373}
1374
1375void abort_http_object_request(struct http_object_request *freq)
1376{
1377        unlink_or_warn(freq->tmpfile);
1378
1379        release_http_object_request(freq);
1380}
1381
1382void release_http_object_request(struct http_object_request *freq)
1383{
1384        if (freq->localfile != -1) {
1385                close(freq->localfile);
1386                freq->localfile = -1;
1387        }
1388        if (freq->url != NULL) {
1389                free(freq->url);
1390                freq->url = NULL;
1391        }
1392        if (freq->slot != NULL) {
1393                freq->slot->callback_func = NULL;
1394                freq->slot->callback_data = NULL;
1395                release_active_slot(freq->slot);
1396                freq->slot = NULL;
1397        }
1398}