Andrew's git / gitweb.git / http.c
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http.con commit Fix username and password extraction from HTTP URLs (f39f72d)
   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
 284        if (getenv("GIT_CURL_VERBOSE"))
 285                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 286
 287        curl_easy_setopt(result, CURLOPT_USERAGENT,
 288                user_agent ? user_agent : GIT_HTTP_USER_AGENT);
 289
 290        if (curl_ftp_no_epsv)
 291                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 292
 293        if (curl_http_proxy)
 294                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 295
 296        return result;
 297}
 298
 299static void http_auth_init(const char *url)
 300{
 301        char *at, *colon, *cp, *slash, *decoded;
 302        int len;
 303
 304        cp = strstr(url, "://");
 305        if (!cp)
 306                return;
 307
 308        /*
 309         * Ok, the URL looks like "proto://something".  Which one?
 310         * "proto://<user>:<pass>@<host>/...",
 311         * "proto://<user>@<host>/...", or just
 312         * "proto://<host>/..."?
 313         */
 314        cp += 3;
 315        at = strchr(cp, '@');
 316        colon = strchr(cp, ':');
 317        slash = strchrnul(cp, '/');
 318        if (!at || slash <= at)
 319                return; /* No credentials */
 320        if (!colon || at <= colon) {
 321                /* Only username */
 322                len = at - cp;
 323                user_name = xmalloc(len + 1);
 324                memcpy(user_name, cp, len);
 325                user_name[len] = '\0';
 326                decoded = url_decode(user_name);
 327                free(user_name);
 328                user_name = decoded;
 329                user_pass = NULL;
 330        } else {
 331                len = colon - cp;
 332                user_name = xmalloc(len + 1);
 333                memcpy(user_name, cp, len);
 334                user_name[len] = '\0';
 335                decoded = url_decode(user_name);
 336                free(user_name);
 337                user_name = decoded;
 338                len = at - (colon + 1);
 339                user_pass = xmalloc(len + 1);
 340                memcpy(user_pass, colon + 1, len);
 341                user_pass[len] = '\0';
 342                decoded = url_decode(user_pass);
 343                free(user_pass);
 344                user_pass = decoded;
 345        }
 346}
 347
 348static void set_from_env(const char **var, const char *envname)
 349{
 350        const char *val = getenv(envname);
 351        if (val)
 352                *var = val;
 353}
 354
 355void http_init(struct remote *remote)
 356{
 357        char *low_speed_limit;
 358        char *low_speed_time;
 359
 360        http_is_verbose = 0;
 361
 362        git_config(http_options, NULL);
 363
 364        curl_global_init(CURL_GLOBAL_ALL);
 365
 366        if (remote && remote->http_proxy)
 367                curl_http_proxy = xstrdup(remote->http_proxy);
 368
 369        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 370        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 371
 372#ifdef USE_CURL_MULTI
 373        {
 374                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 375                if (http_max_requests != NULL)
 376                        max_requests = atoi(http_max_requests);
 377        }
 378
 379        curlm = curl_multi_init();
 380        if (curlm == NULL) {
 381                fprintf(stderr, "Error creating curl multi handle.\n");
 382                exit(1);
 383        }
 384#endif
 385
 386        if (getenv("GIT_SSL_NO_VERIFY"))
 387                curl_ssl_verify = 0;
 388
 389        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 390#if LIBCURL_VERSION_NUM >= 0x070903
 391        set_from_env(&ssl_key, "GIT_SSL_KEY");
 392#endif
 393#if LIBCURL_VERSION_NUM >= 0x070908
 394        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 395#endif
 396        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 397
 398        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 399
 400        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 401        if (low_speed_limit != NULL)
 402                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 403        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 404        if (low_speed_time != NULL)
 405                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 406
 407        if (curl_ssl_verify == -1)
 408                curl_ssl_verify = 1;
 409
 410        curl_session_count = 0;
 411#ifdef USE_CURL_MULTI
 412        if (max_requests < 1)
 413                max_requests = DEFAULT_MAX_REQUESTS;
 414#endif
 415
 416        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 417                curl_ftp_no_epsv = 1;
 418
 419        if (remote && remote->url && remote->url[0]) {
 420                http_auth_init(remote->url[0]);
 421                if (!ssl_cert_password_required &&
 422                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 423                    !prefixcmp(remote->url[0], "https://"))
 424                        ssl_cert_password_required = 1;
 425        }
 426
 427#ifndef NO_CURL_EASY_DUPHANDLE
 428        curl_default = get_curl_handle();
 429#endif
 430}
 431
 432void http_cleanup(void)
 433{
 434        struct active_request_slot *slot = active_queue_head;
 435
 436        while (slot != NULL) {
 437                struct active_request_slot *next = slot->next;
 438                if (slot->curl != NULL) {
 439#ifdef USE_CURL_MULTI
 440                        curl_multi_remove_handle(curlm, slot->curl);
 441#endif
 442                        curl_easy_cleanup(slot->curl);
 443                }
 444                free(slot);
 445                slot = next;
 446        }
 447        active_queue_head = NULL;
 448
 449#ifndef NO_CURL_EASY_DUPHANDLE
 450        curl_easy_cleanup(curl_default);
 451#endif
 452
 453#ifdef USE_CURL_MULTI
 454        curl_multi_cleanup(curlm);
 455#endif
 456        curl_global_cleanup();
 457
 458        curl_slist_free_all(pragma_header);
 459        pragma_header = NULL;
 460
 461        curl_slist_free_all(no_pragma_header);
 462        no_pragma_header = NULL;
 463
 464        if (curl_http_proxy) {
 465                free((void *)curl_http_proxy);
 466                curl_http_proxy = NULL;
 467        }
 468
 469        if (ssl_cert_password != NULL) {
 470                memset(ssl_cert_password, 0, strlen(ssl_cert_password));
 471                free(ssl_cert_password);
 472                ssl_cert_password = NULL;
 473        }
 474        ssl_cert_password_required = 0;
 475}
 476
 477struct active_request_slot *get_active_slot(void)
 478{
 479        struct active_request_slot *slot = active_queue_head;
 480        struct active_request_slot *newslot;
 481
 482#ifdef USE_CURL_MULTI
 483        int num_transfers;
 484
 485        /* Wait for a slot to open up if the queue is full */
 486        while (active_requests >= max_requests) {
 487                curl_multi_perform(curlm, &num_transfers);
 488                if (num_transfers < active_requests)
 489                        process_curl_messages();
 490        }
 491#endif
 492
 493        while (slot != NULL && slot->in_use)
 494                slot = slot->next;
 495
 496        if (slot == NULL) {
 497                newslot = xmalloc(sizeof(*newslot));
 498                newslot->curl = NULL;
 499                newslot->in_use = 0;
 500                newslot->next = NULL;
 501
 502                slot = active_queue_head;
 503                if (slot == NULL) {
 504                        active_queue_head = newslot;
 505                } else {
 506                        while (slot->next != NULL)
 507                                slot = slot->next;
 508                        slot->next = newslot;
 509                }
 510                slot = newslot;
 511        }
 512
 513        if (slot->curl == NULL) {
 514#ifdef NO_CURL_EASY_DUPHANDLE
 515                slot->curl = get_curl_handle();
 516#else
 517                slot->curl = curl_easy_duphandle(curl_default);
 518#endif
 519                curl_session_count++;
 520        }
 521
 522        active_requests++;
 523        slot->in_use = 1;
 524        slot->local = NULL;
 525        slot->results = NULL;
 526        slot->finished = NULL;
 527        slot->callback_data = NULL;
 528        slot->callback_func = NULL;
 529        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 530        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 531        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 532        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 533        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 534        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 535        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 536
 537        return slot;
 538}
 539
 540int start_active_slot(struct active_request_slot *slot)
 541{
 542#ifdef USE_CURL_MULTI
 543        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 544        int num_transfers;
 545
 546        if (curlm_result != CURLM_OK &&
 547            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 548                active_requests--;
 549                slot->in_use = 0;
 550                return 0;
 551        }
 552
 553        /*
 554         * We know there must be something to do, since we just added
 555         * something.
 556         */
 557        curl_multi_perform(curlm, &num_transfers);
 558#endif
 559        return 1;
 560}
 561
 562#ifdef USE_CURL_MULTI
 563struct fill_chain {
 564        void *data;
 565        int (*fill)(void *);
 566        struct fill_chain *next;
 567};
 568
 569static struct fill_chain *fill_cfg;
 570
 571void add_fill_function(void *data, int (*fill)(void *))
 572{
 573        struct fill_chain *new = xmalloc(sizeof(*new));
 574        struct fill_chain **linkp = &fill_cfg;
 575        new->data = data;
 576        new->fill = fill;
 577        new->next = NULL;
 578        while (*linkp)
 579                linkp = &(*linkp)->next;
 580        *linkp = new;
 581}
 582
 583void fill_active_slots(void)
 584{
 585        struct active_request_slot *slot = active_queue_head;
 586
 587        while (active_requests < max_requests) {
 588                struct fill_chain *fill;
 589                for (fill = fill_cfg; fill; fill = fill->next)
 590                        if (fill->fill(fill->data))
 591                                break;
 592
 593                if (!fill)
 594                        break;
 595        }
 596
 597        while (slot != NULL) {
 598                if (!slot->in_use && slot->curl != NULL
 599                        && curl_session_count > min_curl_sessions) {
 600                        curl_easy_cleanup(slot->curl);
 601                        slot->curl = NULL;
 602                        curl_session_count--;
 603                }
 604                slot = slot->next;
 605        }
 606}
 607
 608void step_active_slots(void)
 609{
 610        int num_transfers;
 611        CURLMcode curlm_result;
 612
 613        do {
 614                curlm_result = curl_multi_perform(curlm, &num_transfers);
 615        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 616        if (num_transfers < active_requests) {
 617                process_curl_messages();
 618                fill_active_slots();
 619        }
 620}
 621#endif
 622
 623void run_active_slot(struct active_request_slot *slot)
 624{
 625#ifdef USE_CURL_MULTI
 626        long last_pos = 0;
 627        long current_pos;
 628        fd_set readfds;
 629        fd_set writefds;
 630        fd_set excfds;
 631        int max_fd;
 632        struct timeval select_timeout;
 633        int finished = 0;
 634
 635        slot->finished = &finished;
 636        while (!finished) {
 637                data_received = 0;
 638                step_active_slots();
 639
 640                if (!data_received && slot->local != NULL) {
 641                        current_pos = ftell(slot->local);
 642                        if (current_pos > last_pos)
 643                                data_received++;
 644                        last_pos = current_pos;
 645                }
 646
 647                if (slot->in_use && !data_received) {
 648                        max_fd = 0;
 649                        FD_ZERO(&readfds);
 650                        FD_ZERO(&writefds);
 651                        FD_ZERO(&excfds);
 652                        select_timeout.tv_sec = 0;
 653                        select_timeout.tv_usec = 50000;
 654                        select(max_fd, &readfds, &writefds,
 655                               &excfds, &select_timeout);
 656                }
 657        }
 658#else
 659        while (slot->in_use) {
 660                slot->curl_result = curl_easy_perform(slot->curl);
 661                finish_active_slot(slot);
 662        }
 663#endif
 664}
 665
 666static void closedown_active_slot(struct active_request_slot *slot)
 667{
 668        active_requests--;
 669        slot->in_use = 0;
 670}
 671
 672static void release_active_slot(struct active_request_slot *slot)
 673{
 674        closedown_active_slot(slot);
 675        if (slot->curl && curl_session_count > min_curl_sessions) {
 676#ifdef USE_CURL_MULTI
 677                curl_multi_remove_handle(curlm, slot->curl);
 678#endif
 679                curl_easy_cleanup(slot->curl);
 680                slot->curl = NULL;
 681                curl_session_count--;
 682        }
 683#ifdef USE_CURL_MULTI
 684        fill_active_slots();
 685#endif
 686}
 687
 688void finish_active_slot(struct active_request_slot *slot)
 689{
 690        closedown_active_slot(slot);
 691        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 692
 693        if (slot->finished != NULL)
 694                (*slot->finished) = 1;
 695
 696        /* Store slot results so they can be read after the slot is reused */
 697        if (slot->results != NULL) {
 698                slot->results->curl_result = slot->curl_result;
 699                slot->results->http_code = slot->http_code;
 700        }
 701
 702        /* Run callback if appropriate */
 703        if (slot->callback_func != NULL)
 704                slot->callback_func(slot->callback_data);
 705}
 706
 707void finish_all_active_slots(void)
 708{
 709        struct active_request_slot *slot = active_queue_head;
 710
 711        while (slot != NULL)
 712                if (slot->in_use) {
 713                        run_active_slot(slot);
 714                        slot = active_queue_head;
 715                } else {
 716                        slot = slot->next;
 717                }
 718}
 719
 720/* Helpers for modifying and creating URLs */
 721static inline int needs_quote(int ch)
 722{
 723        if (((ch >= 'A') && (ch <= 'Z'))
 724                        || ((ch >= 'a') && (ch <= 'z'))
 725                        || ((ch >= '0') && (ch <= '9'))
 726                        || (ch == '/')
 727                        || (ch == '-')
 728                        || (ch == '.'))
 729                return 0;
 730        return 1;
 731}
 732
 733static inline int hex(int v)
 734{
 735        if (v < 10)
 736                return '0' + v;
 737        else
 738                return 'A' + v - 10;
 739}
 740
 741void end_url_with_slash(struct strbuf *buf, const char *url)
 742{
 743        strbuf_addstr(buf, url);
 744        if (buf->len && buf->buf[buf->len - 1] != '/')
 745                strbuf_addstr(buf, "/");
 746}
 747
 748static char *quote_ref_url(const char *base, const char *ref)
 749{
 750        struct strbuf buf = STRBUF_INIT;
 751        const char *cp;
 752        int ch;
 753
 754        end_url_with_slash(&buf, base);
 755
 756        for (cp = ref; (ch = *cp) != 0; cp++)
 757                if (needs_quote(ch))
 758                        strbuf_addf(&buf, "%%%02x", ch);
 759                else
 760                        strbuf_addch(&buf, *cp);
 761
 762        return strbuf_detach(&buf, NULL);
 763}
 764
 765void append_remote_object_url(struct strbuf *buf, const char *url,
 766                              const char *hex,
 767                              int only_two_digit_prefix)
 768{
 769        end_url_with_slash(buf, url);
 770
 771        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 772        if (!only_two_digit_prefix)
 773                strbuf_addf(buf, "%s", hex+2);
 774}
 775
 776char *get_remote_object_url(const char *url, const char *hex,
 777                            int only_two_digit_prefix)
 778{
 779        struct strbuf buf = STRBUF_INIT;
 780        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 781        return strbuf_detach(&buf, NULL);
 782}
 783
 784/* http_request() targets */
 785#define HTTP_REQUEST_STRBUF     0
 786#define HTTP_REQUEST_FILE       1
 787
 788static int http_request(const char *url, void *result, int target, int options)
 789{
 790        struct active_request_slot *slot;
 791        struct slot_results results;
 792        struct curl_slist *headers = NULL;
 793        struct strbuf buf = STRBUF_INIT;
 794        int ret;
 795
 796        slot = get_active_slot();
 797        slot->results = &results;
 798        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 799
 800        if (result == NULL) {
 801                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 802        } else {
 803                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 804                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 805
 806                if (target == HTTP_REQUEST_FILE) {
 807                        long posn = ftell(result);
 808                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 809                                         fwrite);
 810                        if (posn > 0) {
 811                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 812                                headers = curl_slist_append(headers, buf.buf);
 813                                strbuf_reset(&buf);
 814                        }
 815                        slot->local = result;
 816                } else
 817                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 818                                         fwrite_buffer);
 819        }
 820
 821        strbuf_addstr(&buf, "Pragma:");
 822        if (options & HTTP_NO_CACHE)
 823                strbuf_addstr(&buf, " no-cache");
 824
 825        headers = curl_slist_append(headers, buf.buf);
 826
 827        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 828        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 829
 830        if (start_active_slot(slot)) {
 831                run_active_slot(slot);
 832                if (results.curl_result == CURLE_OK)
 833                        ret = HTTP_OK;
 834                else if (missing_target(&results))
 835                        ret = HTTP_MISSING_TARGET;
 836                else if (results.http_code == 401) {
 837                        if (user_name) {
 838                                ret = HTTP_NOAUTH;
 839                        } else {
 840                                /*
 841                                 * git_getpass is needed here because its very likely stdin/stdout are
 842                                 * pipes to our parent process.  So we instead need to use /dev/tty,
 843                                 * but that is non-portable.  Using git_getpass() can at least be stubbed
 844                                 * on other platforms with a different implementation if/when necessary.
 845                                 */
 846                                user_name = xstrdup(git_getpass("Username: "));
 847                                init_curl_http_auth(slot->curl);
 848                                ret = HTTP_REAUTH;
 849                        }
 850                } else
 851                        ret = HTTP_ERROR;
 852        } else {
 853                error("Unable to start HTTP request for %s", url);
 854                ret = HTTP_START_FAILED;
 855        }
 856
 857        slot->local = NULL;
 858        curl_slist_free_all(headers);
 859        strbuf_release(&buf);
 860
 861        return ret;
 862}
 863
 864int http_get_strbuf(const char *url, struct strbuf *result, int options)
 865{
 866        int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
 867        if (http_ret == HTTP_REAUTH) {
 868                http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
 869        }
 870        return http_ret;
 871}
 872
 873/*
 874 * Downloads an url and stores the result in the given file.
 875 *
 876 * If a previous interrupted download is detected (i.e. a previous temporary
 877 * file is still around) the download is resumed.
 878 */
 879static int http_get_file(const char *url, const char *filename, int options)
 880{
 881        int ret;
 882        struct strbuf tmpfile = STRBUF_INIT;
 883        FILE *result;
 884
 885        strbuf_addf(&tmpfile, "%s.temp", filename);
 886        result = fopen(tmpfile.buf, "a");
 887        if (! result) {
 888                error("Unable to open local file %s", tmpfile.buf);
 889                ret = HTTP_ERROR;
 890                goto cleanup;
 891        }
 892
 893        ret = http_request(url, result, HTTP_REQUEST_FILE, options);
 894        fclose(result);
 895
 896        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 897                ret = HTTP_ERROR;
 898cleanup:
 899        strbuf_release(&tmpfile);
 900        return ret;
 901}
 902
 903int http_error(const char *url, int ret)
 904{
 905        /* http_request has already handled HTTP_START_FAILED. */
 906        if (ret != HTTP_START_FAILED)
 907                error("%s while accessing %s\n", curl_errorstr, url);
 908
 909        return ret;
 910}
 911
 912int http_fetch_ref(const char *base, struct ref *ref)
 913{
 914        char *url;
 915        struct strbuf buffer = STRBUF_INIT;
 916        int ret = -1;
 917
 918        url = quote_ref_url(base, ref->name);
 919        if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 920                strbuf_rtrim(&buffer);
 921                if (buffer.len == 40)
 922                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 923                else if (!prefixcmp(buffer.buf, "ref: ")) {
 924                        ref->symref = xstrdup(buffer.buf + 5);
 925                        ret = 0;
 926                }
 927        }
 928
 929        strbuf_release(&buffer);
 930        free(url);
 931        return ret;
 932}
 933
 934/* Helpers for fetching packs */
 935static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 936{
 937        char *url, *tmp;
 938        struct strbuf buf = STRBUF_INIT;
 939
 940        if (http_is_verbose)
 941                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 942
 943        end_url_with_slash(&buf, base_url);
 944        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 945        url = strbuf_detach(&buf, NULL);
 946
 947        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 948        tmp = strbuf_detach(&buf, NULL);
 949
 950        if (http_get_file(url, tmp, 0) != HTTP_OK) {
 951                error("Unable to get pack index %s\n", url);
 952                free(tmp);
 953                tmp = NULL;
 954        }
 955
 956        free(url);
 957        return tmp;
 958}
 959
 960static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 961        unsigned char *sha1, const char *base_url)
 962{
 963        struct packed_git *new_pack;
 964        char *tmp_idx = NULL;
 965        int ret;
 966
 967        if (has_pack_index(sha1)) {
 968                new_pack = parse_pack_index(sha1, NULL);
 969                if (!new_pack)
 970                        return -1; /* parse_pack_index() already issued error message */
 971                goto add_pack;
 972        }
 973
 974        tmp_idx = fetch_pack_index(sha1, base_url);
 975        if (!tmp_idx)
 976                return -1;
 977
 978        new_pack = parse_pack_index(sha1, tmp_idx);
 979        if (!new_pack) {
 980                unlink(tmp_idx);
 981                free(tmp_idx);
 982
 983                return -1; /* parse_pack_index() already issued error message */
 984        }
 985
 986        ret = verify_pack_index(new_pack);
 987        if (!ret) {
 988                close_pack_index(new_pack);
 989                ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
 990        }
 991        free(tmp_idx);
 992        if (ret)
 993                return -1;
 994
 995add_pack:
 996        new_pack->next = *packs_head;
 997        *packs_head = new_pack;
 998        return 0;
 999}
1000
1001int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1002{
1003        int ret = 0, i = 0;
1004        char *url, *data;
1005        struct strbuf buf = STRBUF_INIT;
1006        unsigned char sha1[20];
1007
1008        end_url_with_slash(&buf, base_url);
1009        strbuf_addstr(&buf, "objects/info/packs");
1010        url = strbuf_detach(&buf, NULL);
1011
1012        ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1013        if (ret != HTTP_OK)
1014                goto cleanup;
1015
1016        data = buf.buf;
1017        while (i < buf.len) {
1018                switch (data[i]) {
1019                case 'P':
1020                        i++;
1021                        if (i + 52 <= buf.len &&
1022                            !prefixcmp(data + i, " pack-") &&
1023                            !prefixcmp(data + i + 46, ".pack\n")) {
1024                                get_sha1_hex(data + i + 6, sha1);
1025                                fetch_and_setup_pack_index(packs_head, sha1,
1026                                                      base_url);
1027                                i += 51;
1028                                break;
1029                        }
1030                default:
1031                        while (i < buf.len && data[i] != '\n')
1032                                i++;
1033                }
1034                i++;
1035        }
1036
1037cleanup:
1038        free(url);
1039        return ret;
1040}
1041
1042void release_http_pack_request(struct http_pack_request *preq)
1043{
1044        if (preq->packfile != NULL) {
1045                fclose(preq->packfile);
1046                preq->packfile = NULL;
1047                preq->slot->local = NULL;
1048        }
1049        if (preq->range_header != NULL) {
1050                curl_slist_free_all(preq->range_header);
1051                preq->range_header = NULL;
1052        }
1053        preq->slot = NULL;
1054        free(preq->url);
1055}
1056
1057int finish_http_pack_request(struct http_pack_request *preq)
1058{
1059        struct packed_git **lst;
1060        struct packed_git *p = preq->target;
1061        char *tmp_idx;
1062        struct child_process ip;
1063        const char *ip_argv[8];
1064
1065        close_pack_index(p);
1066
1067        fclose(preq->packfile);
1068        preq->packfile = NULL;
1069        preq->slot->local = NULL;
1070
1071        lst = preq->lst;
1072        while (*lst != p)
1073                lst = &((*lst)->next);
1074        *lst = (*lst)->next;
1075
1076        tmp_idx = xstrdup(preq->tmpfile);
1077        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1078               ".idx.temp");
1079
1080        ip_argv[0] = "index-pack";
1081        ip_argv[1] = "-o";
1082        ip_argv[2] = tmp_idx;
1083        ip_argv[3] = preq->tmpfile;
1084        ip_argv[4] = NULL;
1085
1086        memset(&ip, 0, sizeof(ip));
1087        ip.argv = ip_argv;
1088        ip.git_cmd = 1;
1089        ip.no_stdin = 1;
1090        ip.no_stdout = 1;
1091
1092        if (run_command(&ip)) {
1093                unlink(preq->tmpfile);
1094                unlink(tmp_idx);
1095                free(tmp_idx);
1096                return -1;
1097        }
1098
1099        unlink(sha1_pack_index_name(p->sha1));
1100
1101        if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1102         || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1103                free(tmp_idx);
1104                return -1;
1105        }
1106
1107        install_packed_git(p);
1108        free(tmp_idx);
1109        return 0;
1110}
1111
1112struct http_pack_request *new_http_pack_request(
1113        struct packed_git *target, const char *base_url)
1114{
1115        long prev_posn = 0;
1116        char range[RANGE_HEADER_SIZE];
1117        struct strbuf buf = STRBUF_INIT;
1118        struct http_pack_request *preq;
1119
1120        preq = xmalloc(sizeof(*preq));
1121        preq->target = target;
1122        preq->range_header = NULL;
1123
1124        end_url_with_slash(&buf, base_url);
1125        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1126                sha1_to_hex(target->sha1));
1127        preq->url = strbuf_detach(&buf, NULL);
1128
1129        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1130                sha1_pack_name(target->sha1));
1131        preq->packfile = fopen(preq->tmpfile, "a");
1132        if (!preq->packfile) {
1133                error("Unable to open local file %s for pack",
1134                      preq->tmpfile);
1135                goto abort;
1136        }
1137
1138        preq->slot = get_active_slot();
1139        preq->slot->local = preq->packfile;
1140        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1141        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1142        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1143        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1144                no_pragma_header);
1145
1146        /*
1147         * If there is data present from a previous transfer attempt,
1148         * resume where it left off
1149         */
1150        prev_posn = ftell(preq->packfile);
1151        if (prev_posn>0) {
1152                if (http_is_verbose)
1153                        fprintf(stderr,
1154                                "Resuming fetch of pack %s at byte %ld\n",
1155                                sha1_to_hex(target->sha1), prev_posn);
1156                sprintf(range, "Range: bytes=%ld-", prev_posn);
1157                preq->range_header = curl_slist_append(NULL, range);
1158                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1159                        preq->range_header);
1160        }
1161
1162        return preq;
1163
1164abort:
1165        free(preq->url);
1166        free(preq);
1167        return NULL;
1168}
1169
1170/* Helpers for fetching objects (loose) */
1171static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1172                               void *data)
1173{
1174        unsigned char expn[4096];
1175        size_t size = eltsize * nmemb;
1176        int posn = 0;
1177        struct http_object_request *freq =
1178                (struct http_object_request *)data;
1179        do {
1180                ssize_t retval = xwrite(freq->localfile,
1181                                        (char *) ptr + posn, size - posn);
1182                if (retval < 0)
1183                        return posn;
1184                posn += retval;
1185        } while (posn < size);
1186
1187        freq->stream.avail_in = size;
1188        freq->stream.next_in = ptr;
1189        do {
1190                freq->stream.next_out = expn;
1191                freq->stream.avail_out = sizeof(expn);
1192                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1193                git_SHA1_Update(&freq->c, expn,
1194                                sizeof(expn) - freq->stream.avail_out);
1195        } while (freq->stream.avail_in && freq->zret == Z_OK);
1196        data_received++;
1197        return size;
1198}
1199
1200struct http_object_request *new_http_object_request(const char *base_url,
1201        unsigned char *sha1)
1202{
1203        char *hex = sha1_to_hex(sha1);
1204        char *filename;
1205        char prevfile[PATH_MAX];
1206        int prevlocal;
1207        unsigned char prev_buf[PREV_BUF_SIZE];
1208        ssize_t prev_read = 0;
1209        long prev_posn = 0;
1210        char range[RANGE_HEADER_SIZE];
1211        struct curl_slist *range_header = NULL;
1212        struct http_object_request *freq;
1213
1214        freq = xmalloc(sizeof(*freq));
1215        hashcpy(freq->sha1, sha1);
1216        freq->localfile = -1;
1217
1218        filename = sha1_file_name(sha1);
1219        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1220                 "%s.temp", filename);
1221
1222        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1223        unlink_or_warn(prevfile);
1224        rename(freq->tmpfile, prevfile);
1225        unlink_or_warn(freq->tmpfile);
1226
1227        if (freq->localfile != -1)
1228                error("fd leakage in start: %d", freq->localfile);
1229        freq->localfile = open(freq->tmpfile,
1230                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1231        /*
1232         * This could have failed due to the "lazy directory creation";
1233         * try to mkdir the last path component.
1234         */
1235        if (freq->localfile < 0 && errno == ENOENT) {
1236                char *dir = strrchr(freq->tmpfile, '/');
1237                if (dir) {
1238                        *dir = 0;
1239                        mkdir(freq->tmpfile, 0777);
1240                        *dir = '/';
1241                }
1242                freq->localfile = open(freq->tmpfile,
1243                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1244        }
1245
1246        if (freq->localfile < 0) {
1247                error("Couldn't create temporary file %s: %s",
1248                      freq->tmpfile, strerror(errno));
1249                goto abort;
1250        }
1251
1252        memset(&freq->stream, 0, sizeof(freq->stream));
1253
1254        git_inflate_init(&freq->stream);
1255
1256        git_SHA1_Init(&freq->c);
1257
1258        freq->url = get_remote_object_url(base_url, hex, 0);
1259
1260        /*
1261         * If a previous temp file is present, process what was already
1262         * fetched.
1263         */
1264        prevlocal = open(prevfile, O_RDONLY);
1265        if (prevlocal != -1) {
1266                do {
1267                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1268                        if (prev_read>0) {
1269                                if (fwrite_sha1_file(prev_buf,
1270                                                     1,
1271                                                     prev_read,
1272                                                     freq) == prev_read) {
1273                                        prev_posn += prev_read;
1274                                } else {
1275                                        prev_read = -1;
1276                                }
1277                        }
1278                } while (prev_read > 0);
1279                close(prevlocal);
1280        }
1281        unlink_or_warn(prevfile);
1282
1283        /*
1284         * Reset inflate/SHA1 if there was an error reading the previous temp
1285         * file; also rewind to the beginning of the local file.
1286         */
1287        if (prev_read == -1) {
1288                memset(&freq->stream, 0, sizeof(freq->stream));
1289                git_inflate_init(&freq->stream);
1290                git_SHA1_Init(&freq->c);
1291                if (prev_posn>0) {
1292                        prev_posn = 0;
1293                        lseek(freq->localfile, 0, SEEK_SET);
1294                        if (ftruncate(freq->localfile, 0) < 0) {
1295                                error("Couldn't truncate temporary file %s: %s",
1296                                          freq->tmpfile, strerror(errno));
1297                                goto abort;
1298                        }
1299                }
1300        }
1301
1302        freq->slot = get_active_slot();
1303
1304        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1305        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1306        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1307        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1308        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1309
1310        /*
1311         * If we have successfully processed data from a previous fetch
1312         * attempt, only fetch the data we don't already have.
1313         */
1314        if (prev_posn>0) {
1315                if (http_is_verbose)
1316                        fprintf(stderr,
1317                                "Resuming fetch of object %s at byte %ld\n",
1318                                hex, prev_posn);
1319                sprintf(range, "Range: bytes=%ld-", prev_posn);
1320                range_header = curl_slist_append(range_header, range);
1321                curl_easy_setopt(freq->slot->curl,
1322                                 CURLOPT_HTTPHEADER, range_header);
1323        }
1324
1325        return freq;
1326
1327abort:
1328        free(filename);
1329        free(freq->url);
1330        free(freq);
1331        return NULL;
1332}
1333
1334void process_http_object_request(struct http_object_request *freq)
1335{
1336        if (freq->slot == NULL)
1337                return;
1338        freq->curl_result = freq->slot->curl_result;
1339        freq->http_code = freq->slot->http_code;
1340        freq->slot = NULL;
1341}
1342
1343int finish_http_object_request(struct http_object_request *freq)
1344{
1345        struct stat st;
1346
1347        close(freq->localfile);
1348        freq->localfile = -1;
1349
1350        process_http_object_request(freq);
1351
1352        if (freq->http_code == 416) {
1353                warning("requested range invalid; we may already have all the data.");
1354        } else if (freq->curl_result != CURLE_OK) {
1355                if (stat(freq->tmpfile, &st) == 0)
1356                        if (st.st_size == 0)
1357                                unlink_or_warn(freq->tmpfile);
1358                return -1;
1359        }
1360
1361        git_inflate_end(&freq->stream);
1362        git_SHA1_Final(freq->real_sha1, &freq->c);
1363        if (freq->zret != Z_STREAM_END) {
1364                unlink_or_warn(freq->tmpfile);
1365                return -1;
1366        }
1367        if (hashcmp(freq->sha1, freq->real_sha1)) {
1368                unlink_or_warn(freq->tmpfile);
1369                return -1;
1370        }
1371        freq->rename =
1372                move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1373
1374        return freq->rename;
1375}
1376
1377void abort_http_object_request(struct http_object_request *freq)
1378{
1379        unlink_or_warn(freq->tmpfile);
1380
1381        release_http_object_request(freq);
1382}
1383
1384void release_http_object_request(struct http_object_request *freq)
1385{
1386        if (freq->localfile != -1) {
1387                close(freq->localfile);
1388                freq->localfile = -1;
1389        }
1390        if (freq->url != NULL) {
1391                free(freq->url);
1392                freq->url = NULL;
1393        }
1394        if (freq->slot != NULL) {
1395                freq->slot->callback_func = NULL;
1396                freq->slot->callback_data = NULL;
1397                release_active_slot(freq->slot);
1398                freq->slot = NULL;
1399        }
1400}