Andrew's git / gitweb.git / http.c
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http.con commit Git.pm: refactor command_close_bidi_pipe to use _cmd_close (1323dba)
   1#include "http.h"
   2#include "pack.h"
   3#include "sideband.h"
   4#include "run-command.h"
   5#include "url.h"
   6#include "credential.h"
   7#include "version.h"
   8
   9int active_requests;
  10int http_is_verbose;
  11size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  12
  13#if LIBCURL_VERSION_NUM >= 0x070a06
  14#define LIBCURL_CAN_HANDLE_AUTH_ANY
  15#endif
  16
  17static int min_curl_sessions = 1;
  18static int curl_session_count;
  19#ifdef USE_CURL_MULTI
  20static int max_requests = -1;
  21static CURLM *curlm;
  22#endif
  23#ifndef NO_CURL_EASY_DUPHANDLE
  24static CURL *curl_default;
  25#endif
  26
  27#define PREV_BUF_SIZE 4096
  28#define RANGE_HEADER_SIZE 30
  29
  30char curl_errorstr[CURL_ERROR_SIZE];
  31
  32static int curl_ssl_verify = -1;
  33static const char *ssl_cert;
  34#if LIBCURL_VERSION_NUM >= 0x070903
  35static const char *ssl_key;
  36#endif
  37#if LIBCURL_VERSION_NUM >= 0x070908
  38static const char *ssl_capath;
  39#endif
  40static const char *ssl_cainfo;
  41static long curl_low_speed_limit = -1;
  42static long curl_low_speed_time = -1;
  43static int curl_ftp_no_epsv;
  44static const char *curl_http_proxy;
  45static const char *curl_cookie_file;
  46static struct credential http_auth = CREDENTIAL_INIT;
  47static int http_proactive_auth;
  48static const char *user_agent;
  49
  50#if LIBCURL_VERSION_NUM >= 0x071700
  51/* Use CURLOPT_KEYPASSWD as is */
  52#elif LIBCURL_VERSION_NUM >= 0x070903
  53#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  54#else
  55#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  56#endif
  57
  58static struct credential cert_auth = CREDENTIAL_INIT;
  59static int ssl_cert_password_required;
  60
  61static struct curl_slist *pragma_header;
  62static struct curl_slist *no_pragma_header;
  63
  64static struct active_request_slot *active_queue_head;
  65
  66size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  67{
  68        size_t size = eltsize * nmemb;
  69        struct buffer *buffer = buffer_;
  70
  71        if (size > buffer->buf.len - buffer->posn)
  72                size = buffer->buf.len - buffer->posn;
  73        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  74        buffer->posn += size;
  75
  76        return size;
  77}
  78
  79#ifndef NO_CURL_IOCTL
  80curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  81{
  82        struct buffer *buffer = clientp;
  83
  84        switch (cmd) {
  85        case CURLIOCMD_NOP:
  86                return CURLIOE_OK;
  87
  88        case CURLIOCMD_RESTARTREAD:
  89                buffer->posn = 0;
  90                return CURLIOE_OK;
  91
  92        default:
  93                return CURLIOE_UNKNOWNCMD;
  94        }
  95}
  96#endif
  97
  98size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  99{
 100        size_t size = eltsize * nmemb;
 101        struct strbuf *buffer = buffer_;
 102
 103        strbuf_add(buffer, ptr, size);
 104        return size;
 105}
 106
 107size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 108{
 109        return eltsize * nmemb;
 110}
 111
 112#ifdef USE_CURL_MULTI
 113static void process_curl_messages(void)
 114{
 115        int num_messages;
 116        struct active_request_slot *slot;
 117        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 118
 119        while (curl_message != NULL) {
 120                if (curl_message->msg == CURLMSG_DONE) {
 121                        int curl_result = curl_message->data.result;
 122                        slot = active_queue_head;
 123                        while (slot != NULL &&
 124                               slot->curl != curl_message->easy_handle)
 125                                slot = slot->next;
 126                        if (slot != NULL) {
 127                                curl_multi_remove_handle(curlm, slot->curl);
 128                                slot->curl_result = curl_result;
 129                                finish_active_slot(slot);
 130                        } else {
 131                                fprintf(stderr, "Received DONE message for unknown request!\n");
 132                        }
 133                } else {
 134                        fprintf(stderr, "Unknown CURL message received: %d\n",
 135                                (int)curl_message->msg);
 136                }
 137                curl_message = curl_multi_info_read(curlm, &num_messages);
 138        }
 139}
 140#endif
 141
 142static int http_options(const char *var, const char *value, void *cb)
 143{
 144        if (!strcmp("http.sslverify", var)) {
 145                curl_ssl_verify = git_config_bool(var, value);
 146                return 0;
 147        }
 148        if (!strcmp("http.sslcert", var))
 149                return git_config_string(&ssl_cert, var, value);
 150#if LIBCURL_VERSION_NUM >= 0x070903
 151        if (!strcmp("http.sslkey", var))
 152                return git_config_string(&ssl_key, var, value);
 153#endif
 154#if LIBCURL_VERSION_NUM >= 0x070908
 155        if (!strcmp("http.sslcapath", var))
 156                return git_config_string(&ssl_capath, var, value);
 157#endif
 158        if (!strcmp("http.sslcainfo", var))
 159                return git_config_string(&ssl_cainfo, var, value);
 160        if (!strcmp("http.sslcertpasswordprotected", var)) {
 161                if (git_config_bool(var, value))
 162                        ssl_cert_password_required = 1;
 163                return 0;
 164        }
 165        if (!strcmp("http.minsessions", var)) {
 166                min_curl_sessions = git_config_int(var, value);
 167#ifndef USE_CURL_MULTI
 168                if (min_curl_sessions > 1)
 169                        min_curl_sessions = 1;
 170#endif
 171                return 0;
 172        }
 173#ifdef USE_CURL_MULTI
 174        if (!strcmp("http.maxrequests", var)) {
 175                max_requests = git_config_int(var, value);
 176                return 0;
 177        }
 178#endif
 179        if (!strcmp("http.lowspeedlimit", var)) {
 180                curl_low_speed_limit = (long)git_config_int(var, value);
 181                return 0;
 182        }
 183        if (!strcmp("http.lowspeedtime", var)) {
 184                curl_low_speed_time = (long)git_config_int(var, value);
 185                return 0;
 186        }
 187
 188        if (!strcmp("http.noepsv", var)) {
 189                curl_ftp_no_epsv = git_config_bool(var, value);
 190                return 0;
 191        }
 192        if (!strcmp("http.proxy", var))
 193                return git_config_string(&curl_http_proxy, var, value);
 194
 195        if (!strcmp("http.cookiefile", var))
 196                return git_config_string(&curl_cookie_file, var, value);
 197
 198        if (!strcmp("http.postbuffer", var)) {
 199                http_post_buffer = git_config_int(var, value);
 200                if (http_post_buffer < LARGE_PACKET_MAX)
 201                        http_post_buffer = LARGE_PACKET_MAX;
 202                return 0;
 203        }
 204
 205        if (!strcmp("http.useragent", var))
 206                return git_config_string(&user_agent, var, value);
 207
 208        /* Fall back on the default ones */
 209        return git_default_config(var, value, cb);
 210}
 211
 212static void init_curl_http_auth(CURL *result)
 213{
 214        if (!http_auth.username)
 215                return;
 216
 217        credential_fill(&http_auth);
 218
 219#if LIBCURL_VERSION_NUM >= 0x071301
 220        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 221        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 222#else
 223        {
 224                static struct strbuf up = STRBUF_INIT;
 225                strbuf_reset(&up);
 226                strbuf_addf(&up, "%s:%s",
 227                            http_auth.username, http_auth.password);
 228                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 229        }
 230#endif
 231}
 232
 233static int has_cert_password(void)
 234{
 235        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 236                return 0;
 237        if (!cert_auth.password) {
 238                cert_auth.protocol = xstrdup("cert");
 239                cert_auth.username = xstrdup("");
 240                cert_auth.path = xstrdup(ssl_cert);
 241                credential_fill(&cert_auth);
 242        }
 243        return 1;
 244}
 245
 246static CURL *get_curl_handle(void)
 247{
 248        CURL *result = curl_easy_init();
 249
 250        if (!curl_ssl_verify) {
 251                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 252                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 253        } else {
 254                /* Verify authenticity of the peer's certificate */
 255                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 256                /* The name in the cert must match whom we tried to connect */
 257                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 258        }
 259
 260#if LIBCURL_VERSION_NUM >= 0x070907
 261        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 262#endif
 263#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 264        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 265#endif
 266
 267        if (http_proactive_auth)
 268                init_curl_http_auth(result);
 269
 270        if (ssl_cert != NULL)
 271                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 272        if (has_cert_password())
 273                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 274#if LIBCURL_VERSION_NUM >= 0x070903
 275        if (ssl_key != NULL)
 276                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 277#endif
 278#if LIBCURL_VERSION_NUM >= 0x070908
 279        if (ssl_capath != NULL)
 280                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 281#endif
 282        if (ssl_cainfo != NULL)
 283                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 284        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 285
 286        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 287                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 288                                 curl_low_speed_limit);
 289                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 290                                 curl_low_speed_time);
 291        }
 292
 293        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 294#if LIBCURL_VERSION_NUM >= 0x071301
 295        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 296#elif LIBCURL_VERSION_NUM >= 0x071101
 297        curl_easy_setopt(result, CURLOPT_POST301, 1);
 298#endif
 299
 300        if (getenv("GIT_CURL_VERBOSE"))
 301                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 302
 303        curl_easy_setopt(result, CURLOPT_USERAGENT,
 304                user_agent ? user_agent : git_user_agent());
 305
 306        if (curl_ftp_no_epsv)
 307                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 308
 309        if (curl_http_proxy) {
 310                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 311                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 312        }
 313
 314        return result;
 315}
 316
 317static void set_from_env(const char **var, const char *envname)
 318{
 319        const char *val = getenv(envname);
 320        if (val)
 321                *var = val;
 322}
 323
 324void http_init(struct remote *remote, const char *url, int proactive_auth)
 325{
 326        char *low_speed_limit;
 327        char *low_speed_time;
 328
 329        http_is_verbose = 0;
 330
 331        git_config(http_options, NULL);
 332
 333        curl_global_init(CURL_GLOBAL_ALL);
 334
 335        http_proactive_auth = proactive_auth;
 336
 337        if (remote && remote->http_proxy)
 338                curl_http_proxy = xstrdup(remote->http_proxy);
 339
 340        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 341        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 342
 343#ifdef USE_CURL_MULTI
 344        {
 345                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 346                if (http_max_requests != NULL)
 347                        max_requests = atoi(http_max_requests);
 348        }
 349
 350        curlm = curl_multi_init();
 351        if (curlm == NULL) {
 352                fprintf(stderr, "Error creating curl multi handle.\n");
 353                exit(1);
 354        }
 355#endif
 356
 357        if (getenv("GIT_SSL_NO_VERIFY"))
 358                curl_ssl_verify = 0;
 359
 360        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 361#if LIBCURL_VERSION_NUM >= 0x070903
 362        set_from_env(&ssl_key, "GIT_SSL_KEY");
 363#endif
 364#if LIBCURL_VERSION_NUM >= 0x070908
 365        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 366#endif
 367        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 368
 369        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 370
 371        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 372        if (low_speed_limit != NULL)
 373                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 374        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 375        if (low_speed_time != NULL)
 376                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 377
 378        if (curl_ssl_verify == -1)
 379                curl_ssl_verify = 1;
 380
 381        curl_session_count = 0;
 382#ifdef USE_CURL_MULTI
 383        if (max_requests < 1)
 384                max_requests = DEFAULT_MAX_REQUESTS;
 385#endif
 386
 387        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 388                curl_ftp_no_epsv = 1;
 389
 390        if (url) {
 391                credential_from_url(&http_auth, url);
 392                if (!ssl_cert_password_required &&
 393                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 394                    !prefixcmp(url, "https://"))
 395                        ssl_cert_password_required = 1;
 396        }
 397
 398#ifndef NO_CURL_EASY_DUPHANDLE
 399        curl_default = get_curl_handle();
 400#endif
 401}
 402
 403void http_cleanup(void)
 404{
 405        struct active_request_slot *slot = active_queue_head;
 406
 407        while (slot != NULL) {
 408                struct active_request_slot *next = slot->next;
 409                if (slot->curl != NULL) {
 410#ifdef USE_CURL_MULTI
 411                        curl_multi_remove_handle(curlm, slot->curl);
 412#endif
 413                        curl_easy_cleanup(slot->curl);
 414                }
 415                free(slot);
 416                slot = next;
 417        }
 418        active_queue_head = NULL;
 419
 420#ifndef NO_CURL_EASY_DUPHANDLE
 421        curl_easy_cleanup(curl_default);
 422#endif
 423
 424#ifdef USE_CURL_MULTI
 425        curl_multi_cleanup(curlm);
 426#endif
 427        curl_global_cleanup();
 428
 429        curl_slist_free_all(pragma_header);
 430        pragma_header = NULL;
 431
 432        curl_slist_free_all(no_pragma_header);
 433        no_pragma_header = NULL;
 434
 435        if (curl_http_proxy) {
 436                free((void *)curl_http_proxy);
 437                curl_http_proxy = NULL;
 438        }
 439
 440        if (cert_auth.password != NULL) {
 441                memset(cert_auth.password, 0, strlen(cert_auth.password));
 442                free(cert_auth.password);
 443                cert_auth.password = NULL;
 444        }
 445        ssl_cert_password_required = 0;
 446}
 447
 448struct active_request_slot *get_active_slot(void)
 449{
 450        struct active_request_slot *slot = active_queue_head;
 451        struct active_request_slot *newslot;
 452
 453#ifdef USE_CURL_MULTI
 454        int num_transfers;
 455
 456        /* Wait for a slot to open up if the queue is full */
 457        while (active_requests >= max_requests) {
 458                curl_multi_perform(curlm, &num_transfers);
 459                if (num_transfers < active_requests)
 460                        process_curl_messages();
 461        }
 462#endif
 463
 464        while (slot != NULL && slot->in_use)
 465                slot = slot->next;
 466
 467        if (slot == NULL) {
 468                newslot = xmalloc(sizeof(*newslot));
 469                newslot->curl = NULL;
 470                newslot->in_use = 0;
 471                newslot->next = NULL;
 472
 473                slot = active_queue_head;
 474                if (slot == NULL) {
 475                        active_queue_head = newslot;
 476                } else {
 477                        while (slot->next != NULL)
 478                                slot = slot->next;
 479                        slot->next = newslot;
 480                }
 481                slot = newslot;
 482        }
 483
 484        if (slot->curl == NULL) {
 485#ifdef NO_CURL_EASY_DUPHANDLE
 486                slot->curl = get_curl_handle();
 487#else
 488                slot->curl = curl_easy_duphandle(curl_default);
 489#endif
 490                curl_session_count++;
 491        }
 492
 493        active_requests++;
 494        slot->in_use = 1;
 495        slot->results = NULL;
 496        slot->finished = NULL;
 497        slot->callback_data = NULL;
 498        slot->callback_func = NULL;
 499        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 500        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 501        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 502        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 503        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 504        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 505        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 506        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 507        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 508        if (http_auth.password)
 509                init_curl_http_auth(slot->curl);
 510
 511        return slot;
 512}
 513
 514int start_active_slot(struct active_request_slot *slot)
 515{
 516#ifdef USE_CURL_MULTI
 517        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 518        int num_transfers;
 519
 520        if (curlm_result != CURLM_OK &&
 521            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 522                active_requests--;
 523                slot->in_use = 0;
 524                return 0;
 525        }
 526
 527        /*
 528         * We know there must be something to do, since we just added
 529         * something.
 530         */
 531        curl_multi_perform(curlm, &num_transfers);
 532#endif
 533        return 1;
 534}
 535
 536#ifdef USE_CURL_MULTI
 537struct fill_chain {
 538        void *data;
 539        int (*fill)(void *);
 540        struct fill_chain *next;
 541};
 542
 543static struct fill_chain *fill_cfg;
 544
 545void add_fill_function(void *data, int (*fill)(void *))
 546{
 547        struct fill_chain *new = xmalloc(sizeof(*new));
 548        struct fill_chain **linkp = &fill_cfg;
 549        new->data = data;
 550        new->fill = fill;
 551        new->next = NULL;
 552        while (*linkp)
 553                linkp = &(*linkp)->next;
 554        *linkp = new;
 555}
 556
 557void fill_active_slots(void)
 558{
 559        struct active_request_slot *slot = active_queue_head;
 560
 561        while (active_requests < max_requests) {
 562                struct fill_chain *fill;
 563                for (fill = fill_cfg; fill; fill = fill->next)
 564                        if (fill->fill(fill->data))
 565                                break;
 566
 567                if (!fill)
 568                        break;
 569        }
 570
 571        while (slot != NULL) {
 572                if (!slot->in_use && slot->curl != NULL
 573                        && curl_session_count > min_curl_sessions) {
 574                        curl_easy_cleanup(slot->curl);
 575                        slot->curl = NULL;
 576                        curl_session_count--;
 577                }
 578                slot = slot->next;
 579        }
 580}
 581
 582void step_active_slots(void)
 583{
 584        int num_transfers;
 585        CURLMcode curlm_result;
 586
 587        do {
 588                curlm_result = curl_multi_perform(curlm, &num_transfers);
 589        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 590        if (num_transfers < active_requests) {
 591                process_curl_messages();
 592                fill_active_slots();
 593        }
 594}
 595#endif
 596
 597void run_active_slot(struct active_request_slot *slot)
 598{
 599#ifdef USE_CURL_MULTI
 600        fd_set readfds;
 601        fd_set writefds;
 602        fd_set excfds;
 603        int max_fd;
 604        struct timeval select_timeout;
 605        int finished = 0;
 606
 607        slot->finished = &finished;
 608        while (!finished) {
 609                step_active_slots();
 610
 611                if (slot->in_use) {
 612#if LIBCURL_VERSION_NUM >= 0x070f04
 613                        long curl_timeout;
 614                        curl_multi_timeout(curlm, &curl_timeout);
 615                        if (curl_timeout == 0) {
 616                                continue;
 617                        } else if (curl_timeout == -1) {
 618                                select_timeout.tv_sec  = 0;
 619                                select_timeout.tv_usec = 50000;
 620                        } else {
 621                                select_timeout.tv_sec  =  curl_timeout / 1000;
 622                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 623                        }
 624#else
 625                        select_timeout.tv_sec  = 0;
 626                        select_timeout.tv_usec = 50000;
 627#endif
 628
 629                        max_fd = -1;
 630                        FD_ZERO(&readfds);
 631                        FD_ZERO(&writefds);
 632                        FD_ZERO(&excfds);
 633                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 634
 635                        /*
 636                         * It can happen that curl_multi_timeout returns a pathologically
 637                         * long timeout when curl_multi_fdset returns no file descriptors
 638                         * to read.  See commit message for more details.
 639                         */
 640                        if (max_fd < 0 &&
 641                            (select_timeout.tv_sec > 0 ||
 642                             select_timeout.tv_usec > 50000)) {
 643                                select_timeout.tv_sec  = 0;
 644                                select_timeout.tv_usec = 50000;
 645                        }
 646
 647                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 648                }
 649        }
 650#else
 651        while (slot->in_use) {
 652                slot->curl_result = curl_easy_perform(slot->curl);
 653                finish_active_slot(slot);
 654        }
 655#endif
 656}
 657
 658static void closedown_active_slot(struct active_request_slot *slot)
 659{
 660        active_requests--;
 661        slot->in_use = 0;
 662}
 663
 664static void release_active_slot(struct active_request_slot *slot)
 665{
 666        closedown_active_slot(slot);
 667        if (slot->curl && curl_session_count > min_curl_sessions) {
 668#ifdef USE_CURL_MULTI
 669                curl_multi_remove_handle(curlm, slot->curl);
 670#endif
 671                curl_easy_cleanup(slot->curl);
 672                slot->curl = NULL;
 673                curl_session_count--;
 674        }
 675#ifdef USE_CURL_MULTI
 676        fill_active_slots();
 677#endif
 678}
 679
 680void finish_active_slot(struct active_request_slot *slot)
 681{
 682        closedown_active_slot(slot);
 683        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 684
 685        if (slot->finished != NULL)
 686                (*slot->finished) = 1;
 687
 688        /* Store slot results so they can be read after the slot is reused */
 689        if (slot->results != NULL) {
 690                slot->results->curl_result = slot->curl_result;
 691                slot->results->http_code = slot->http_code;
 692        }
 693
 694        /* Run callback if appropriate */
 695        if (slot->callback_func != NULL)
 696                slot->callback_func(slot->callback_data);
 697}
 698
 699void finish_all_active_slots(void)
 700{
 701        struct active_request_slot *slot = active_queue_head;
 702
 703        while (slot != NULL)
 704                if (slot->in_use) {
 705                        run_active_slot(slot);
 706                        slot = active_queue_head;
 707                } else {
 708                        slot = slot->next;
 709                }
 710}
 711
 712/* Helpers for modifying and creating URLs */
 713static inline int needs_quote(int ch)
 714{
 715        if (((ch >= 'A') && (ch <= 'Z'))
 716                        || ((ch >= 'a') && (ch <= 'z'))
 717                        || ((ch >= '0') && (ch <= '9'))
 718                        || (ch == '/')
 719                        || (ch == '-')
 720                        || (ch == '.'))
 721                return 0;
 722        return 1;
 723}
 724
 725static char *quote_ref_url(const char *base, const char *ref)
 726{
 727        struct strbuf buf = STRBUF_INIT;
 728        const char *cp;
 729        int ch;
 730
 731        end_url_with_slash(&buf, base);
 732
 733        for (cp = ref; (ch = *cp) != 0; cp++)
 734                if (needs_quote(ch))
 735                        strbuf_addf(&buf, "%%%02x", ch);
 736                else
 737                        strbuf_addch(&buf, *cp);
 738
 739        return strbuf_detach(&buf, NULL);
 740}
 741
 742void append_remote_object_url(struct strbuf *buf, const char *url,
 743                              const char *hex,
 744                              int only_two_digit_prefix)
 745{
 746        end_url_with_slash(buf, url);
 747
 748        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 749        if (!only_two_digit_prefix)
 750                strbuf_addf(buf, "%s", hex+2);
 751}
 752
 753char *get_remote_object_url(const char *url, const char *hex,
 754                            int only_two_digit_prefix)
 755{
 756        struct strbuf buf = STRBUF_INIT;
 757        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 758        return strbuf_detach(&buf, NULL);
 759}
 760
 761int handle_curl_result(struct slot_results *results)
 762{
 763        if (results->curl_result == CURLE_OK) {
 764                credential_approve(&http_auth);
 765                return HTTP_OK;
 766        } else if (missing_target(results))
 767                return HTTP_MISSING_TARGET;
 768        else if (results->http_code == 401) {
 769                if (http_auth.username && http_auth.password) {
 770                        credential_reject(&http_auth);
 771                        return HTTP_NOAUTH;
 772                } else {
 773                        credential_fill(&http_auth);
 774                        return HTTP_REAUTH;
 775                }
 776        } else {
 777#if LIBCURL_VERSION_NUM >= 0x070c00
 778                if (!curl_errorstr[0])
 779                        strlcpy(curl_errorstr,
 780                                curl_easy_strerror(results->curl_result),
 781                                sizeof(curl_errorstr));
 782#endif
 783                return HTTP_ERROR;
 784        }
 785}
 786
 787/* http_request() targets */
 788#define HTTP_REQUEST_STRBUF     0
 789#define HTTP_REQUEST_FILE       1
 790
 791static int http_request(const char *url, void *result, int target, int options)
 792{
 793        struct active_request_slot *slot;
 794        struct slot_results results;
 795        struct curl_slist *headers = NULL;
 796        struct strbuf buf = STRBUF_INIT;
 797        int ret;
 798
 799        slot = get_active_slot();
 800        slot->results = &results;
 801        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 802
 803        if (result == NULL) {
 804                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 805        } else {
 806                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 807                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 808
 809                if (target == HTTP_REQUEST_FILE) {
 810                        long posn = ftell(result);
 811                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 812                                         fwrite);
 813                        if (posn > 0) {
 814                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 815                                headers = curl_slist_append(headers, buf.buf);
 816                                strbuf_reset(&buf);
 817                        }
 818                } else
 819                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 820                                         fwrite_buffer);
 821        }
 822
 823        strbuf_addstr(&buf, "Pragma:");
 824        if (options & HTTP_NO_CACHE)
 825                strbuf_addstr(&buf, " no-cache");
 826
 827        headers = curl_slist_append(headers, buf.buf);
 828
 829        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 830        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 831        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 832
 833        if (start_active_slot(slot)) {
 834                run_active_slot(slot);
 835                ret = handle_curl_result(&results);
 836        } else {
 837                error("Unable to start HTTP request for %s", url);
 838                ret = HTTP_START_FAILED;
 839        }
 840
 841        curl_slist_free_all(headers);
 842        strbuf_release(&buf);
 843
 844        return ret;
 845}
 846
 847static int http_request_reauth(const char *url, void *result, int target,
 848                               int options)
 849{
 850        int ret = http_request(url, result, target, options);
 851        if (ret != HTTP_REAUTH)
 852                return ret;
 853        return http_request(url, result, target, options);
 854}
 855
 856int http_get_strbuf(const char *url, struct strbuf *result, int options)
 857{
 858        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
 859}
 860
 861/*
 862 * Downloads a URL and stores the result in the given file.
 863 *
 864 * If a previous interrupted download is detected (i.e. a previous temporary
 865 * file is still around) the download is resumed.
 866 */
 867static int http_get_file(const char *url, const char *filename, int options)
 868{
 869        int ret;
 870        struct strbuf tmpfile = STRBUF_INIT;
 871        FILE *result;
 872
 873        strbuf_addf(&tmpfile, "%s.temp", filename);
 874        result = fopen(tmpfile.buf, "a");
 875        if (! result) {
 876                error("Unable to open local file %s", tmpfile.buf);
 877                ret = HTTP_ERROR;
 878                goto cleanup;
 879        }
 880
 881        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
 882        fclose(result);
 883
 884        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 885                ret = HTTP_ERROR;
 886cleanup:
 887        strbuf_release(&tmpfile);
 888        return ret;
 889}
 890
 891int http_error(const char *url, int ret)
 892{
 893        /* http_request has already handled HTTP_START_FAILED. */
 894        if (ret != HTTP_START_FAILED)
 895                error("%s while accessing %s", curl_errorstr, url);
 896
 897        return ret;
 898}
 899
 900int http_fetch_ref(const char *base, struct ref *ref)
 901{
 902        char *url;
 903        struct strbuf buffer = STRBUF_INIT;
 904        int ret = -1;
 905
 906        url = quote_ref_url(base, ref->name);
 907        if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 908                strbuf_rtrim(&buffer);
 909                if (buffer.len == 40)
 910                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 911                else if (!prefixcmp(buffer.buf, "ref: ")) {
 912                        ref->symref = xstrdup(buffer.buf + 5);
 913                        ret = 0;
 914                }
 915        }
 916
 917        strbuf_release(&buffer);
 918        free(url);
 919        return ret;
 920}
 921
 922/* Helpers for fetching packs */
 923static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 924{
 925        char *url, *tmp;
 926        struct strbuf buf = STRBUF_INIT;
 927
 928        if (http_is_verbose)
 929                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 930
 931        end_url_with_slash(&buf, base_url);
 932        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 933        url = strbuf_detach(&buf, NULL);
 934
 935        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 936        tmp = strbuf_detach(&buf, NULL);
 937
 938        if (http_get_file(url, tmp, 0) != HTTP_OK) {
 939                error("Unable to get pack index %s", url);
 940                free(tmp);
 941                tmp = NULL;
 942        }
 943
 944        free(url);
 945        return tmp;
 946}
 947
 948static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 949        unsigned char *sha1, const char *base_url)
 950{
 951        struct packed_git *new_pack;
 952        char *tmp_idx = NULL;
 953        int ret;
 954
 955        if (has_pack_index(sha1)) {
 956                new_pack = parse_pack_index(sha1, NULL);
 957                if (!new_pack)
 958                        return -1; /* parse_pack_index() already issued error message */
 959                goto add_pack;
 960        }
 961
 962        tmp_idx = fetch_pack_index(sha1, base_url);
 963        if (!tmp_idx)
 964                return -1;
 965
 966        new_pack = parse_pack_index(sha1, tmp_idx);
 967        if (!new_pack) {
 968                unlink(tmp_idx);
 969                free(tmp_idx);
 970
 971                return -1; /* parse_pack_index() already issued error message */
 972        }
 973
 974        ret = verify_pack_index(new_pack);
 975        if (!ret) {
 976                close_pack_index(new_pack);
 977                ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
 978        }
 979        free(tmp_idx);
 980        if (ret)
 981                return -1;
 982
 983add_pack:
 984        new_pack->next = *packs_head;
 985        *packs_head = new_pack;
 986        return 0;
 987}
 988
 989int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 990{
 991        int ret = 0, i = 0;
 992        char *url, *data;
 993        struct strbuf buf = STRBUF_INIT;
 994        unsigned char sha1[20];
 995
 996        end_url_with_slash(&buf, base_url);
 997        strbuf_addstr(&buf, "objects/info/packs");
 998        url = strbuf_detach(&buf, NULL);
 999
1000        ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1001        if (ret != HTTP_OK)
1002                goto cleanup;
1003
1004        data = buf.buf;
1005        while (i < buf.len) {
1006                switch (data[i]) {
1007                case 'P':
1008                        i++;
1009                        if (i + 52 <= buf.len &&
1010                            !prefixcmp(data + i, " pack-") &&
1011                            !prefixcmp(data + i + 46, ".pack\n")) {
1012                                get_sha1_hex(data + i + 6, sha1);
1013                                fetch_and_setup_pack_index(packs_head, sha1,
1014                                                      base_url);
1015                                i += 51;
1016                                break;
1017                        }
1018                default:
1019                        while (i < buf.len && data[i] != '\n')
1020                                i++;
1021                }
1022                i++;
1023        }
1024
1025cleanup:
1026        free(url);
1027        return ret;
1028}
1029
1030void release_http_pack_request(struct http_pack_request *preq)
1031{
1032        if (preq->packfile != NULL) {
1033                fclose(preq->packfile);
1034                preq->packfile = NULL;
1035        }
1036        if (preq->range_header != NULL) {
1037                curl_slist_free_all(preq->range_header);
1038                preq->range_header = NULL;
1039        }
1040        preq->slot = NULL;
1041        free(preq->url);
1042}
1043
1044int finish_http_pack_request(struct http_pack_request *preq)
1045{
1046        struct packed_git **lst;
1047        struct packed_git *p = preq->target;
1048        char *tmp_idx;
1049        struct child_process ip;
1050        const char *ip_argv[8];
1051
1052        close_pack_index(p);
1053
1054        fclose(preq->packfile);
1055        preq->packfile = NULL;
1056
1057        lst = preq->lst;
1058        while (*lst != p)
1059                lst = &((*lst)->next);
1060        *lst = (*lst)->next;
1061
1062        tmp_idx = xstrdup(preq->tmpfile);
1063        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1064               ".idx.temp");
1065
1066        ip_argv[0] = "index-pack";
1067        ip_argv[1] = "-o";
1068        ip_argv[2] = tmp_idx;
1069        ip_argv[3] = preq->tmpfile;
1070        ip_argv[4] = NULL;
1071
1072        memset(&ip, 0, sizeof(ip));
1073        ip.argv = ip_argv;
1074        ip.git_cmd = 1;
1075        ip.no_stdin = 1;
1076        ip.no_stdout = 1;
1077
1078        if (run_command(&ip)) {
1079                unlink(preq->tmpfile);
1080                unlink(tmp_idx);
1081                free(tmp_idx);
1082                return -1;
1083        }
1084
1085        unlink(sha1_pack_index_name(p->sha1));
1086
1087        if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1088         || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1089                free(tmp_idx);
1090                return -1;
1091        }
1092
1093        install_packed_git(p);
1094        free(tmp_idx);
1095        return 0;
1096}
1097
1098struct http_pack_request *new_http_pack_request(
1099        struct packed_git *target, const char *base_url)
1100{
1101        long prev_posn = 0;
1102        char range[RANGE_HEADER_SIZE];
1103        struct strbuf buf = STRBUF_INIT;
1104        struct http_pack_request *preq;
1105
1106        preq = xcalloc(1, sizeof(*preq));
1107        preq->target = target;
1108
1109        end_url_with_slash(&buf, base_url);
1110        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1111                sha1_to_hex(target->sha1));
1112        preq->url = strbuf_detach(&buf, NULL);
1113
1114        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1115                sha1_pack_name(target->sha1));
1116        preq->packfile = fopen(preq->tmpfile, "a");
1117        if (!preq->packfile) {
1118                error("Unable to open local file %s for pack",
1119                      preq->tmpfile);
1120                goto abort;
1121        }
1122
1123        preq->slot = get_active_slot();
1124        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1125        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1126        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1127        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1128                no_pragma_header);
1129
1130        /*
1131         * If there is data present from a previous transfer attempt,
1132         * resume where it left off
1133         */
1134        prev_posn = ftell(preq->packfile);
1135        if (prev_posn>0) {
1136                if (http_is_verbose)
1137                        fprintf(stderr,
1138                                "Resuming fetch of pack %s at byte %ld\n",
1139                                sha1_to_hex(target->sha1), prev_posn);
1140                sprintf(range, "Range: bytes=%ld-", prev_posn);
1141                preq->range_header = curl_slist_append(NULL, range);
1142                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1143                        preq->range_header);
1144        }
1145
1146        return preq;
1147
1148abort:
1149        free(preq->url);
1150        free(preq);
1151        return NULL;
1152}
1153
1154/* Helpers for fetching objects (loose) */
1155static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1156                               void *data)
1157{
1158        unsigned char expn[4096];
1159        size_t size = eltsize * nmemb;
1160        int posn = 0;
1161        struct http_object_request *freq =
1162                (struct http_object_request *)data;
1163        do {
1164                ssize_t retval = xwrite(freq->localfile,
1165                                        (char *) ptr + posn, size - posn);
1166                if (retval < 0)
1167                        return posn;
1168                posn += retval;
1169        } while (posn < size);
1170
1171        freq->stream.avail_in = size;
1172        freq->stream.next_in = (void *)ptr;
1173        do {
1174                freq->stream.next_out = expn;
1175                freq->stream.avail_out = sizeof(expn);
1176                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1177                git_SHA1_Update(&freq->c, expn,
1178                                sizeof(expn) - freq->stream.avail_out);
1179        } while (freq->stream.avail_in && freq->zret == Z_OK);
1180        return size;
1181}
1182
1183struct http_object_request *new_http_object_request(const char *base_url,
1184        unsigned char *sha1)
1185{
1186        char *hex = sha1_to_hex(sha1);
1187        char *filename;
1188        char prevfile[PATH_MAX];
1189        int prevlocal;
1190        char prev_buf[PREV_BUF_SIZE];
1191        ssize_t prev_read = 0;
1192        long prev_posn = 0;
1193        char range[RANGE_HEADER_SIZE];
1194        struct curl_slist *range_header = NULL;
1195        struct http_object_request *freq;
1196
1197        freq = xcalloc(1, sizeof(*freq));
1198        hashcpy(freq->sha1, sha1);
1199        freq->localfile = -1;
1200
1201        filename = sha1_file_name(sha1);
1202        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1203                 "%s.temp", filename);
1204
1205        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1206        unlink_or_warn(prevfile);
1207        rename(freq->tmpfile, prevfile);
1208        unlink_or_warn(freq->tmpfile);
1209
1210        if (freq->localfile != -1)
1211                error("fd leakage in start: %d", freq->localfile);
1212        freq->localfile = open(freq->tmpfile,
1213                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1214        /*
1215         * This could have failed due to the "lazy directory creation";
1216         * try to mkdir the last path component.
1217         */
1218        if (freq->localfile < 0 && errno == ENOENT) {
1219                char *dir = strrchr(freq->tmpfile, '/');
1220                if (dir) {
1221                        *dir = 0;
1222                        mkdir(freq->tmpfile, 0777);
1223                        *dir = '/';
1224                }
1225                freq->localfile = open(freq->tmpfile,
1226                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1227        }
1228
1229        if (freq->localfile < 0) {
1230                error("Couldn't create temporary file %s: %s",
1231                      freq->tmpfile, strerror(errno));
1232                goto abort;
1233        }
1234
1235        git_inflate_init(&freq->stream);
1236
1237        git_SHA1_Init(&freq->c);
1238
1239        freq->url = get_remote_object_url(base_url, hex, 0);
1240
1241        /*
1242         * If a previous temp file is present, process what was already
1243         * fetched.
1244         */
1245        prevlocal = open(prevfile, O_RDONLY);
1246        if (prevlocal != -1) {
1247                do {
1248                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1249                        if (prev_read>0) {
1250                                if (fwrite_sha1_file(prev_buf,
1251                                                     1,
1252                                                     prev_read,
1253                                                     freq) == prev_read) {
1254                                        prev_posn += prev_read;
1255                                } else {
1256                                        prev_read = -1;
1257                                }
1258                        }
1259                } while (prev_read > 0);
1260                close(prevlocal);
1261        }
1262        unlink_or_warn(prevfile);
1263
1264        /*
1265         * Reset inflate/SHA1 if there was an error reading the previous temp
1266         * file; also rewind to the beginning of the local file.
1267         */
1268        if (prev_read == -1) {
1269                memset(&freq->stream, 0, sizeof(freq->stream));
1270                git_inflate_init(&freq->stream);
1271                git_SHA1_Init(&freq->c);
1272                if (prev_posn>0) {
1273                        prev_posn = 0;
1274                        lseek(freq->localfile, 0, SEEK_SET);
1275                        if (ftruncate(freq->localfile, 0) < 0) {
1276                                error("Couldn't truncate temporary file %s: %s",
1277                                          freq->tmpfile, strerror(errno));
1278                                goto abort;
1279                        }
1280                }
1281        }
1282
1283        freq->slot = get_active_slot();
1284
1285        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1286        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1287        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1288        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1289        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1290
1291        /*
1292         * If we have successfully processed data from a previous fetch
1293         * attempt, only fetch the data we don't already have.
1294         */
1295        if (prev_posn>0) {
1296                if (http_is_verbose)
1297                        fprintf(stderr,
1298                                "Resuming fetch of object %s at byte %ld\n",
1299                                hex, prev_posn);
1300                sprintf(range, "Range: bytes=%ld-", prev_posn);
1301                range_header = curl_slist_append(range_header, range);
1302                curl_easy_setopt(freq->slot->curl,
1303                                 CURLOPT_HTTPHEADER, range_header);
1304        }
1305
1306        return freq;
1307
1308abort:
1309        free(freq->url);
1310        free(freq);
1311        return NULL;
1312}
1313
1314void process_http_object_request(struct http_object_request *freq)
1315{
1316        if (freq->slot == NULL)
1317                return;
1318        freq->curl_result = freq->slot->curl_result;
1319        freq->http_code = freq->slot->http_code;
1320        freq->slot = NULL;
1321}
1322
1323int finish_http_object_request(struct http_object_request *freq)
1324{
1325        struct stat st;
1326
1327        close(freq->localfile);
1328        freq->localfile = -1;
1329
1330        process_http_object_request(freq);
1331
1332        if (freq->http_code == 416) {
1333                warning("requested range invalid; we may already have all the data.");
1334        } else if (freq->curl_result != CURLE_OK) {
1335                if (stat(freq->tmpfile, &st) == 0)
1336                        if (st.st_size == 0)
1337                                unlink_or_warn(freq->tmpfile);
1338                return -1;
1339        }
1340
1341        git_inflate_end(&freq->stream);
1342        git_SHA1_Final(freq->real_sha1, &freq->c);
1343        if (freq->zret != Z_STREAM_END) {
1344                unlink_or_warn(freq->tmpfile);
1345                return -1;
1346        }
1347        if (hashcmp(freq->sha1, freq->real_sha1)) {
1348                unlink_or_warn(freq->tmpfile);
1349                return -1;
1350        }
1351        freq->rename =
1352                move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1353
1354        return freq->rename;
1355}
1356
1357void abort_http_object_request(struct http_object_request *freq)
1358{
1359        unlink_or_warn(freq->tmpfile);
1360
1361        release_http_object_request(freq);
1362}
1363
1364void release_http_object_request(struct http_object_request *freq)
1365{
1366        if (freq->localfile != -1) {
1367                close(freq->localfile);
1368                freq->localfile = -1;
1369        }
1370        if (freq->url != NULL) {
1371                free(freq->url);
1372                freq->url = NULL;
1373        }
1374        if (freq->slot != NULL) {
1375                freq->slot->callback_func = NULL;
1376                freq->slot->callback_data = NULL;
1377                release_active_slot(freq->slot);
1378                freq->slot = NULL;
1379        }
1380}