Andrew's git / gitweb.git / http.c
?
http.con commit http.c: add http.sslCertPasswordProtected option (754ae19)
   1#include "http.h"
   2
   3int data_received;
   4int active_requests;
   5
   6#ifdef USE_CURL_MULTI
   7static int max_requests = -1;
   8static CURLM *curlm;
   9#endif
  10#ifndef NO_CURL_EASY_DUPHANDLE
  11static CURL *curl_default;
  12#endif
  13char curl_errorstr[CURL_ERROR_SIZE];
  14
  15static int curl_ssl_verify = -1;
  16static const char *ssl_cert;
  17#if LIBCURL_VERSION_NUM >= 0x070902
  18static const char *ssl_key;
  19#endif
  20#if LIBCURL_VERSION_NUM >= 0x070908
  21static const char *ssl_capath;
  22#endif
  23static const char *ssl_cainfo;
  24static long curl_low_speed_limit = -1;
  25static long curl_low_speed_time = -1;
  26static int curl_ftp_no_epsv;
  27static const char *curl_http_proxy;
  28static char *user_name, *user_pass;
  29
  30#if LIBCURL_VERSION_NUM >= 0x071700
  31/* Use CURLOPT_KEYPASSWD as is */
  32#elif LIBCURL_VERSION_NUM >= 0x070903
  33#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  34#else
  35#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  36#endif
  37
  38static char *ssl_cert_password;
  39static int ssl_cert_password_required;
  40
  41static struct curl_slist *pragma_header;
  42
  43static struct active_request_slot *active_queue_head;
  44
  45size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  46{
  47        size_t size = eltsize * nmemb;
  48        struct buffer *buffer = buffer_;
  49
  50        if (size > buffer->buf.len - buffer->posn)
  51                size = buffer->buf.len - buffer->posn;
  52        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  53        buffer->posn += size;
  54
  55        return size;
  56}
  57
  58#ifndef NO_CURL_IOCTL
  59curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  60{
  61        struct buffer *buffer = clientp;
  62
  63        switch (cmd) {
  64        case CURLIOCMD_NOP:
  65                return CURLIOE_OK;
  66
  67        case CURLIOCMD_RESTARTREAD:
  68                buffer->posn = 0;
  69                return CURLIOE_OK;
  70
  71        default:
  72                return CURLIOE_UNKNOWNCMD;
  73        }
  74}
  75#endif
  76
  77size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  78{
  79        size_t size = eltsize * nmemb;
  80        struct strbuf *buffer = buffer_;
  81
  82        strbuf_add(buffer, ptr, size);
  83        data_received++;
  84        return size;
  85}
  86
  87size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
  88{
  89        data_received++;
  90        return eltsize * nmemb;
  91}
  92
  93static void finish_active_slot(struct active_request_slot *slot);
  94
  95#ifdef USE_CURL_MULTI
  96static void process_curl_messages(void)
  97{
  98        int num_messages;
  99        struct active_request_slot *slot;
 100        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 101
 102        while (curl_message != NULL) {
 103                if (curl_message->msg == CURLMSG_DONE) {
 104                        int curl_result = curl_message->data.result;
 105                        slot = active_queue_head;
 106                        while (slot != NULL &&
 107                               slot->curl != curl_message->easy_handle)
 108                                slot = slot->next;
 109                        if (slot != NULL) {
 110                                curl_multi_remove_handle(curlm, slot->curl);
 111                                slot->curl_result = curl_result;
 112                                finish_active_slot(slot);
 113                        } else {
 114                                fprintf(stderr, "Received DONE message for unknown request!\n");
 115                        }
 116                } else {
 117                        fprintf(stderr, "Unknown CURL message received: %d\n",
 118                                (int)curl_message->msg);
 119                }
 120                curl_message = curl_multi_info_read(curlm, &num_messages);
 121        }
 122}
 123#endif
 124
 125static int http_options(const char *var, const char *value, void *cb)
 126{
 127        if (!strcmp("http.sslverify", var)) {
 128                curl_ssl_verify = git_config_bool(var, value);
 129                return 0;
 130        }
 131        if (!strcmp("http.sslcert", var))
 132                return git_config_string(&ssl_cert, var, value);
 133#if LIBCURL_VERSION_NUM >= 0x070902
 134        if (!strcmp("http.sslkey", var))
 135                return git_config_string(&ssl_key, var, value);
 136#endif
 137#if LIBCURL_VERSION_NUM >= 0x070908
 138        if (!strcmp("http.sslcapath", var))
 139                return git_config_string(&ssl_capath, var, value);
 140#endif
 141        if (!strcmp("http.sslcainfo", var))
 142                return git_config_string(&ssl_cainfo, var, value);
 143        if (!strcmp("http.sslcertpasswordprotected", var)) {
 144                if (git_config_bool(var, value))
 145                        ssl_cert_password_required = 1;
 146                return 0;
 147        }
 148#ifdef USE_CURL_MULTI
 149        if (!strcmp("http.maxrequests", var)) {
 150                max_requests = git_config_int(var, value);
 151                return 0;
 152        }
 153#endif
 154        if (!strcmp("http.lowspeedlimit", var)) {
 155                curl_low_speed_limit = (long)git_config_int(var, value);
 156                return 0;
 157        }
 158        if (!strcmp("http.lowspeedtime", var)) {
 159                curl_low_speed_time = (long)git_config_int(var, value);
 160                return 0;
 161        }
 162
 163        if (!strcmp("http.noepsv", var)) {
 164                curl_ftp_no_epsv = git_config_bool(var, value);
 165                return 0;
 166        }
 167        if (!strcmp("http.proxy", var))
 168                return git_config_string(&curl_http_proxy, var, value);
 169
 170        /* Fall back on the default ones */
 171        return git_default_config(var, value, cb);
 172}
 173
 174static void init_curl_http_auth(CURL *result)
 175{
 176        if (user_name) {
 177                struct strbuf up = STRBUF_INIT;
 178                if (!user_pass)
 179                        user_pass = xstrdup(getpass("Password: "));
 180                strbuf_addf(&up, "%s:%s", user_name, user_pass);
 181                curl_easy_setopt(result, CURLOPT_USERPWD,
 182                                 strbuf_detach(&up, NULL));
 183        }
 184}
 185
 186static int has_cert_password(void)
 187{
 188        if (ssl_cert_password != NULL)
 189                return 1;
 190        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 191                return 0;
 192        /* Only prompt the user once. */
 193        ssl_cert_password_required = -1;
 194        ssl_cert_password = getpass("Certificate Password: ");
 195        if (ssl_cert_password != NULL) {
 196                ssl_cert_password = xstrdup(ssl_cert_password);
 197                return 1;
 198        } else
 199                return 0;
 200}
 201
 202static CURL *get_curl_handle(void)
 203{
 204        CURL *result = curl_easy_init();
 205
 206        if (!curl_ssl_verify) {
 207                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 208                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 209        } else {
 210                /* Verify authenticity of the peer's certificate */
 211                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 212                /* The name in the cert must match whom we tried to connect */
 213                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 214        }
 215
 216#if LIBCURL_VERSION_NUM >= 0x070907
 217        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 218#endif
 219
 220        init_curl_http_auth(result);
 221
 222        if (ssl_cert != NULL)
 223                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 224        if (has_cert_password())
 225                curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
 226#if LIBCURL_VERSION_NUM >= 0x070902
 227        if (ssl_key != NULL)
 228                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 229#endif
 230#if LIBCURL_VERSION_NUM >= 0x070908
 231        if (ssl_capath != NULL)
 232                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 233#endif
 234        if (ssl_cainfo != NULL)
 235                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 236        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 237
 238        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 239                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 240                                 curl_low_speed_limit);
 241                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 242                                 curl_low_speed_time);
 243        }
 244
 245        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 246
 247        if (getenv("GIT_CURL_VERBOSE"))
 248                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 249
 250        curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 251
 252        if (curl_ftp_no_epsv)
 253                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 254
 255        if (curl_http_proxy)
 256                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 257
 258        return result;
 259}
 260
 261static void http_auth_init(const char *url)
 262{
 263        char *at, *colon, *cp, *slash;
 264        int len;
 265
 266        cp = strstr(url, "://");
 267        if (!cp)
 268                return;
 269
 270        /*
 271         * Ok, the URL looks like "proto://something".  Which one?
 272         * "proto://<user>:<pass>@<host>/...",
 273         * "proto://<user>@<host>/...", or just
 274         * "proto://<host>/..."?
 275         */
 276        cp += 3;
 277        at = strchr(cp, '@');
 278        colon = strchr(cp, ':');
 279        slash = strchrnul(cp, '/');
 280        if (!at || slash <= at)
 281                return; /* No credentials */
 282        if (!colon || at <= colon) {
 283                /* Only username */
 284                len = at - cp;
 285                user_name = xmalloc(len + 1);
 286                memcpy(user_name, cp, len);
 287                user_name[len] = '\0';
 288                user_pass = NULL;
 289        } else {
 290                len = colon - cp;
 291                user_name = xmalloc(len + 1);
 292                memcpy(user_name, cp, len);
 293                user_name[len] = '\0';
 294                len = at - (colon + 1);
 295                user_pass = xmalloc(len + 1);
 296                memcpy(user_pass, colon + 1, len);
 297                user_pass[len] = '\0';
 298        }
 299}
 300
 301static void set_from_env(const char **var, const char *envname)
 302{
 303        const char *val = getenv(envname);
 304        if (val)
 305                *var = val;
 306}
 307
 308void http_init(struct remote *remote)
 309{
 310        char *low_speed_limit;
 311        char *low_speed_time;
 312
 313        git_config(http_options, NULL);
 314
 315        curl_global_init(CURL_GLOBAL_ALL);
 316
 317        if (remote && remote->http_proxy)
 318                curl_http_proxy = xstrdup(remote->http_proxy);
 319
 320        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 321
 322#ifdef USE_CURL_MULTI
 323        {
 324                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 325                if (http_max_requests != NULL)
 326                        max_requests = atoi(http_max_requests);
 327        }
 328
 329        curlm = curl_multi_init();
 330        if (curlm == NULL) {
 331                fprintf(stderr, "Error creating curl multi handle.\n");
 332                exit(1);
 333        }
 334#endif
 335
 336        if (getenv("GIT_SSL_NO_VERIFY"))
 337                curl_ssl_verify = 0;
 338
 339        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 340#if LIBCURL_VERSION_NUM >= 0x070902
 341        set_from_env(&ssl_key, "GIT_SSL_KEY");
 342#endif
 343#if LIBCURL_VERSION_NUM >= 0x070908
 344        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 345#endif
 346        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 347
 348        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 349        if (low_speed_limit != NULL)
 350                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 351        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 352        if (low_speed_time != NULL)
 353                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 354
 355        if (curl_ssl_verify == -1)
 356                curl_ssl_verify = 1;
 357
 358#ifdef USE_CURL_MULTI
 359        if (max_requests < 1)
 360                max_requests = DEFAULT_MAX_REQUESTS;
 361#endif
 362
 363        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 364                curl_ftp_no_epsv = 1;
 365
 366        if (remote && remote->url && remote->url[0]) {
 367                http_auth_init(remote->url[0]);
 368                if (!ssl_cert_password_required &&
 369                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 370                    !prefixcmp(remote->url[0], "https://"))
 371                        ssl_cert_password_required = 1;
 372        }
 373
 374#ifndef NO_CURL_EASY_DUPHANDLE
 375        curl_default = get_curl_handle();
 376#endif
 377}
 378
 379void http_cleanup(void)
 380{
 381        struct active_request_slot *slot = active_queue_head;
 382
 383        while (slot != NULL) {
 384                struct active_request_slot *next = slot->next;
 385                if (slot->curl != NULL) {
 386#ifdef USE_CURL_MULTI
 387                        curl_multi_remove_handle(curlm, slot->curl);
 388#endif
 389                        curl_easy_cleanup(slot->curl);
 390                }
 391                free(slot);
 392                slot = next;
 393        }
 394        active_queue_head = NULL;
 395
 396#ifndef NO_CURL_EASY_DUPHANDLE
 397        curl_easy_cleanup(curl_default);
 398#endif
 399
 400#ifdef USE_CURL_MULTI
 401        curl_multi_cleanup(curlm);
 402#endif
 403        curl_global_cleanup();
 404
 405        curl_slist_free_all(pragma_header);
 406        pragma_header = NULL;
 407
 408        if (curl_http_proxy) {
 409                free((void *)curl_http_proxy);
 410                curl_http_proxy = NULL;
 411        }
 412
 413        if (ssl_cert_password != NULL) {
 414                memset(ssl_cert_password, 0, strlen(ssl_cert_password));
 415                free(ssl_cert_password);
 416                ssl_cert_password = NULL;
 417        }
 418        ssl_cert_password_required = 0;
 419}
 420
 421struct active_request_slot *get_active_slot(void)
 422{
 423        struct active_request_slot *slot = active_queue_head;
 424        struct active_request_slot *newslot;
 425
 426#ifdef USE_CURL_MULTI
 427        int num_transfers;
 428
 429        /* Wait for a slot to open up if the queue is full */
 430        while (active_requests >= max_requests) {
 431                curl_multi_perform(curlm, &num_transfers);
 432                if (num_transfers < active_requests)
 433                        process_curl_messages();
 434        }
 435#endif
 436
 437        while (slot != NULL && slot->in_use)
 438                slot = slot->next;
 439
 440        if (slot == NULL) {
 441                newslot = xmalloc(sizeof(*newslot));
 442                newslot->curl = NULL;
 443                newslot->in_use = 0;
 444                newslot->next = NULL;
 445
 446                slot = active_queue_head;
 447                if (slot == NULL) {
 448                        active_queue_head = newslot;
 449                } else {
 450                        while (slot->next != NULL)
 451                                slot = slot->next;
 452                        slot->next = newslot;
 453                }
 454                slot = newslot;
 455        }
 456
 457        if (slot->curl == NULL) {
 458#ifdef NO_CURL_EASY_DUPHANDLE
 459                slot->curl = get_curl_handle();
 460#else
 461                slot->curl = curl_easy_duphandle(curl_default);
 462#endif
 463        }
 464
 465        active_requests++;
 466        slot->in_use = 1;
 467        slot->local = NULL;
 468        slot->results = NULL;
 469        slot->finished = NULL;
 470        slot->callback_data = NULL;
 471        slot->callback_func = NULL;
 472        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 473        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 474        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 475        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 476        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 477        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 478        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 479
 480        return slot;
 481}
 482
 483int start_active_slot(struct active_request_slot *slot)
 484{
 485#ifdef USE_CURL_MULTI
 486        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 487        int num_transfers;
 488
 489        if (curlm_result != CURLM_OK &&
 490            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 491                active_requests--;
 492                slot->in_use = 0;
 493                return 0;
 494        }
 495
 496        /*
 497         * We know there must be something to do, since we just added
 498         * something.
 499         */
 500        curl_multi_perform(curlm, &num_transfers);
 501#endif
 502        return 1;
 503}
 504
 505#ifdef USE_CURL_MULTI
 506struct fill_chain {
 507        void *data;
 508        int (*fill)(void *);
 509        struct fill_chain *next;
 510};
 511
 512static struct fill_chain *fill_cfg;
 513
 514void add_fill_function(void *data, int (*fill)(void *))
 515{
 516        struct fill_chain *new = xmalloc(sizeof(*new));
 517        struct fill_chain **linkp = &fill_cfg;
 518        new->data = data;
 519        new->fill = fill;
 520        new->next = NULL;
 521        while (*linkp)
 522                linkp = &(*linkp)->next;
 523        *linkp = new;
 524}
 525
 526void fill_active_slots(void)
 527{
 528        struct active_request_slot *slot = active_queue_head;
 529
 530        while (active_requests < max_requests) {
 531                struct fill_chain *fill;
 532                for (fill = fill_cfg; fill; fill = fill->next)
 533                        if (fill->fill(fill->data))
 534                                break;
 535
 536                if (!fill)
 537                        break;
 538        }
 539
 540        while (slot != NULL) {
 541                if (!slot->in_use && slot->curl != NULL) {
 542                        curl_easy_cleanup(slot->curl);
 543                        slot->curl = NULL;
 544                }
 545                slot = slot->next;
 546        }
 547}
 548
 549void step_active_slots(void)
 550{
 551        int num_transfers;
 552        CURLMcode curlm_result;
 553
 554        do {
 555                curlm_result = curl_multi_perform(curlm, &num_transfers);
 556        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 557        if (num_transfers < active_requests) {
 558                process_curl_messages();
 559                fill_active_slots();
 560        }
 561}
 562#endif
 563
 564void run_active_slot(struct active_request_slot *slot)
 565{
 566#ifdef USE_CURL_MULTI
 567        long last_pos = 0;
 568        long current_pos;
 569        fd_set readfds;
 570        fd_set writefds;
 571        fd_set excfds;
 572        int max_fd;
 573        struct timeval select_timeout;
 574        int finished = 0;
 575
 576        slot->finished = &finished;
 577        while (!finished) {
 578                data_received = 0;
 579                step_active_slots();
 580
 581                if (!data_received && slot->local != NULL) {
 582                        current_pos = ftell(slot->local);
 583                        if (current_pos > last_pos)
 584                                data_received++;
 585                        last_pos = current_pos;
 586                }
 587
 588                if (slot->in_use && !data_received) {
 589                        max_fd = 0;
 590                        FD_ZERO(&readfds);
 591                        FD_ZERO(&writefds);
 592                        FD_ZERO(&excfds);
 593                        select_timeout.tv_sec = 0;
 594                        select_timeout.tv_usec = 50000;
 595                        select(max_fd, &readfds, &writefds,
 596                               &excfds, &select_timeout);
 597                }
 598        }
 599#else
 600        while (slot->in_use) {
 601                slot->curl_result = curl_easy_perform(slot->curl);
 602                finish_active_slot(slot);
 603        }
 604#endif
 605}
 606
 607static void closedown_active_slot(struct active_request_slot *slot)
 608{
 609        active_requests--;
 610        slot->in_use = 0;
 611}
 612
 613void release_active_slot(struct active_request_slot *slot)
 614{
 615        closedown_active_slot(slot);
 616        if (slot->curl) {
 617#ifdef USE_CURL_MULTI
 618                curl_multi_remove_handle(curlm, slot->curl);
 619#endif
 620                curl_easy_cleanup(slot->curl);
 621                slot->curl = NULL;
 622        }
 623#ifdef USE_CURL_MULTI
 624        fill_active_slots();
 625#endif
 626}
 627
 628static void finish_active_slot(struct active_request_slot *slot)
 629{
 630        closedown_active_slot(slot);
 631        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 632
 633        if (slot->finished != NULL)
 634                (*slot->finished) = 1;
 635
 636        /* Store slot results so they can be read after the slot is reused */
 637        if (slot->results != NULL) {
 638                slot->results->curl_result = slot->curl_result;
 639                slot->results->http_code = slot->http_code;
 640        }
 641
 642        /* Run callback if appropriate */
 643        if (slot->callback_func != NULL)
 644                slot->callback_func(slot->callback_data);
 645}
 646
 647void finish_all_active_slots(void)
 648{
 649        struct active_request_slot *slot = active_queue_head;
 650
 651        while (slot != NULL)
 652                if (slot->in_use) {
 653                        run_active_slot(slot);
 654                        slot = active_queue_head;
 655                } else {
 656                        slot = slot->next;
 657                }
 658}
 659
 660static inline int needs_quote(int ch)
 661{
 662        if (((ch >= 'A') && (ch <= 'Z'))
 663                        || ((ch >= 'a') && (ch <= 'z'))
 664                        || ((ch >= '0') && (ch <= '9'))
 665                        || (ch == '/')
 666                        || (ch == '-')
 667                        || (ch == '.'))
 668                return 0;
 669        return 1;
 670}
 671
 672static inline int hex(int v)
 673{
 674        if (v < 10)
 675                return '0' + v;
 676        else
 677                return 'A' + v - 10;
 678}
 679
 680static char *quote_ref_url(const char *base, const char *ref)
 681{
 682        struct strbuf buf = STRBUF_INIT;
 683        const char *cp;
 684        int ch;
 685
 686        strbuf_addstr(&buf, base);
 687        if (buf.len && buf.buf[buf.len - 1] != '/' && *ref != '/')
 688                strbuf_addstr(&buf, "/");
 689
 690        for (cp = ref; (ch = *cp) != 0; cp++)
 691                if (needs_quote(ch))
 692                        strbuf_addf(&buf, "%%%02x", ch);
 693                else
 694                        strbuf_addch(&buf, *cp);
 695
 696        return strbuf_detach(&buf, NULL);
 697}
 698
 699int http_fetch_ref(const char *base, struct ref *ref)
 700{
 701        char *url;
 702        struct strbuf buffer = STRBUF_INIT;
 703        struct active_request_slot *slot;
 704        struct slot_results results;
 705        int ret;
 706
 707        url = quote_ref_url(base, ref->name);
 708        slot = get_active_slot();
 709        slot->results = &results;
 710        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 711        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 712        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 713        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 714        if (start_active_slot(slot)) {
 715                run_active_slot(slot);
 716                if (results.curl_result == CURLE_OK) {
 717                        strbuf_rtrim(&buffer);
 718                        if (buffer.len == 40)
 719                                ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 720                        else if (!prefixcmp(buffer.buf, "ref: ")) {
 721                                ref->symref = xstrdup(buffer.buf + 5);
 722                                ret = 0;
 723                        } else
 724                                ret = 1;
 725                } else {
 726                        ret = error("Couldn't get %s for %s\n%s",
 727                                    url, ref->name, curl_errorstr);
 728                }
 729        } else {
 730                ret = error("Unable to start request");
 731        }
 732
 733        strbuf_release(&buffer);
 734        free(url);
 735        return ret;
 736}