Andrew's git / gitweb.git / http.c
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http.con commit Merge branch 'jx/clean-interactive' (13f17f3)
   1#include "http.h"
   2#include "pack.h"
   3#include "sideband.h"
   4#include "run-command.h"
   5#include "url.h"
   6#include "urlmatch.h"
   7#include "credential.h"
   8#include "version.h"
   9#include "pkt-line.h"
  10
  11int active_requests;
  12int http_is_verbose;
  13size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  14
  15#if LIBCURL_VERSION_NUM >= 0x070a06
  16#define LIBCURL_CAN_HANDLE_AUTH_ANY
  17#endif
  18
  19static int min_curl_sessions = 1;
  20static int curl_session_count;
  21#ifdef USE_CURL_MULTI
  22static int max_requests = -1;
  23static CURLM *curlm;
  24#endif
  25#ifndef NO_CURL_EASY_DUPHANDLE
  26static CURL *curl_default;
  27#endif
  28
  29#define PREV_BUF_SIZE 4096
  30#define RANGE_HEADER_SIZE 30
  31
  32char curl_errorstr[CURL_ERROR_SIZE];
  33
  34static int curl_ssl_verify = -1;
  35static int curl_ssl_try;
  36static const char *ssl_cert;
  37#if LIBCURL_VERSION_NUM >= 0x070903
  38static const char *ssl_key;
  39#endif
  40#if LIBCURL_VERSION_NUM >= 0x070908
  41static const char *ssl_capath;
  42#endif
  43static const char *ssl_cainfo;
  44static long curl_low_speed_limit = -1;
  45static long curl_low_speed_time = -1;
  46static int curl_ftp_no_epsv;
  47static const char *curl_http_proxy;
  48static const char *curl_cookie_file;
  49static int curl_save_cookies;
  50static struct credential http_auth = CREDENTIAL_INIT;
  51static int http_proactive_auth;
  52static const char *user_agent;
  53
  54#if LIBCURL_VERSION_NUM >= 0x071700
  55/* Use CURLOPT_KEYPASSWD as is */
  56#elif LIBCURL_VERSION_NUM >= 0x070903
  57#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  58#else
  59#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  60#endif
  61
  62static struct credential cert_auth = CREDENTIAL_INIT;
  63static int ssl_cert_password_required;
  64
  65static struct curl_slist *pragma_header;
  66static struct curl_slist *no_pragma_header;
  67
  68static struct active_request_slot *active_queue_head;
  69
  70size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  71{
  72        size_t size = eltsize * nmemb;
  73        struct buffer *buffer = buffer_;
  74
  75        if (size > buffer->buf.len - buffer->posn)
  76                size = buffer->buf.len - buffer->posn;
  77        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  78        buffer->posn += size;
  79
  80        return size;
  81}
  82
  83#ifndef NO_CURL_IOCTL
  84curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  85{
  86        struct buffer *buffer = clientp;
  87
  88        switch (cmd) {
  89        case CURLIOCMD_NOP:
  90                return CURLIOE_OK;
  91
  92        case CURLIOCMD_RESTARTREAD:
  93                buffer->posn = 0;
  94                return CURLIOE_OK;
  95
  96        default:
  97                return CURLIOE_UNKNOWNCMD;
  98        }
  99}
 100#endif
 101
 102size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 103{
 104        size_t size = eltsize * nmemb;
 105        struct strbuf *buffer = buffer_;
 106
 107        strbuf_add(buffer, ptr, size);
 108        return size;
 109}
 110
 111size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 112{
 113        return eltsize * nmemb;
 114}
 115
 116#ifdef USE_CURL_MULTI
 117static void process_curl_messages(void)
 118{
 119        int num_messages;
 120        struct active_request_slot *slot;
 121        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 122
 123        while (curl_message != NULL) {
 124                if (curl_message->msg == CURLMSG_DONE) {
 125                        int curl_result = curl_message->data.result;
 126                        slot = active_queue_head;
 127                        while (slot != NULL &&
 128                               slot->curl != curl_message->easy_handle)
 129                                slot = slot->next;
 130                        if (slot != NULL) {
 131                                curl_multi_remove_handle(curlm, slot->curl);
 132                                slot->curl_result = curl_result;
 133                                finish_active_slot(slot);
 134                        } else {
 135                                fprintf(stderr, "Received DONE message for unknown request!\n");
 136                        }
 137                } else {
 138                        fprintf(stderr, "Unknown CURL message received: %d\n",
 139                                (int)curl_message->msg);
 140                }
 141                curl_message = curl_multi_info_read(curlm, &num_messages);
 142        }
 143}
 144#endif
 145
 146static int http_options(const char *var, const char *value, void *cb)
 147{
 148        if (!strcmp("http.sslverify", var)) {
 149                curl_ssl_verify = git_config_bool(var, value);
 150                return 0;
 151        }
 152        if (!strcmp("http.sslcert", var))
 153                return git_config_string(&ssl_cert, var, value);
 154#if LIBCURL_VERSION_NUM >= 0x070903
 155        if (!strcmp("http.sslkey", var))
 156                return git_config_string(&ssl_key, var, value);
 157#endif
 158#if LIBCURL_VERSION_NUM >= 0x070908
 159        if (!strcmp("http.sslcapath", var))
 160                return git_config_string(&ssl_capath, var, value);
 161#endif
 162        if (!strcmp("http.sslcainfo", var))
 163                return git_config_string(&ssl_cainfo, var, value);
 164        if (!strcmp("http.sslcertpasswordprotected", var)) {
 165                ssl_cert_password_required = git_config_bool(var, value);
 166                return 0;
 167        }
 168        if (!strcmp("http.ssltry", var)) {
 169                curl_ssl_try = git_config_bool(var, value);
 170                return 0;
 171        }
 172        if (!strcmp("http.minsessions", var)) {
 173                min_curl_sessions = git_config_int(var, value);
 174#ifndef USE_CURL_MULTI
 175                if (min_curl_sessions > 1)
 176                        min_curl_sessions = 1;
 177#endif
 178                return 0;
 179        }
 180#ifdef USE_CURL_MULTI
 181        if (!strcmp("http.maxrequests", var)) {
 182                max_requests = git_config_int(var, value);
 183                return 0;
 184        }
 185#endif
 186        if (!strcmp("http.lowspeedlimit", var)) {
 187                curl_low_speed_limit = (long)git_config_int(var, value);
 188                return 0;
 189        }
 190        if (!strcmp("http.lowspeedtime", var)) {
 191                curl_low_speed_time = (long)git_config_int(var, value);
 192                return 0;
 193        }
 194
 195        if (!strcmp("http.noepsv", var)) {
 196                curl_ftp_no_epsv = git_config_bool(var, value);
 197                return 0;
 198        }
 199        if (!strcmp("http.proxy", var))
 200                return git_config_string(&curl_http_proxy, var, value);
 201
 202        if (!strcmp("http.cookiefile", var))
 203                return git_config_string(&curl_cookie_file, var, value);
 204        if (!strcmp("http.savecookies", var)) {
 205                curl_save_cookies = git_config_bool(var, value);
 206                return 0;
 207        }
 208
 209        if (!strcmp("http.postbuffer", var)) {
 210                http_post_buffer = git_config_int(var, value);
 211                if (http_post_buffer < LARGE_PACKET_MAX)
 212                        http_post_buffer = LARGE_PACKET_MAX;
 213                return 0;
 214        }
 215
 216        if (!strcmp("http.useragent", var))
 217                return git_config_string(&user_agent, var, value);
 218
 219        /* Fall back on the default ones */
 220        return git_default_config(var, value, cb);
 221}
 222
 223static void init_curl_http_auth(CURL *result)
 224{
 225        if (!http_auth.username)
 226                return;
 227
 228        credential_fill(&http_auth);
 229
 230#if LIBCURL_VERSION_NUM >= 0x071301
 231        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 232        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 233#else
 234        {
 235                static struct strbuf up = STRBUF_INIT;
 236                /*
 237                 * Note that we assume we only ever have a single set of
 238                 * credentials in a given program run, so we do not have
 239                 * to worry about updating this buffer, only setting its
 240                 * initial value.
 241                 */
 242                if (!up.len)
 243                        strbuf_addf(&up, "%s:%s",
 244                                http_auth.username, http_auth.password);
 245                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 246        }
 247#endif
 248}
 249
 250static int has_cert_password(void)
 251{
 252        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 253                return 0;
 254        if (!cert_auth.password) {
 255                cert_auth.protocol = xstrdup("cert");
 256                cert_auth.username = xstrdup("");
 257                cert_auth.path = xstrdup(ssl_cert);
 258                credential_fill(&cert_auth);
 259        }
 260        return 1;
 261}
 262
 263static CURL *get_curl_handle(void)
 264{
 265        CURL *result = curl_easy_init();
 266
 267        if (!curl_ssl_verify) {
 268                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 269                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 270        } else {
 271                /* Verify authenticity of the peer's certificate */
 272                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 273                /* The name in the cert must match whom we tried to connect */
 274                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 275        }
 276
 277#if LIBCURL_VERSION_NUM >= 0x070907
 278        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 279#endif
 280#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 281        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 282#endif
 283
 284        if (http_proactive_auth)
 285                init_curl_http_auth(result);
 286
 287        if (ssl_cert != NULL)
 288                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 289        if (has_cert_password())
 290                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 291#if LIBCURL_VERSION_NUM >= 0x070903
 292        if (ssl_key != NULL)
 293                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 294#endif
 295#if LIBCURL_VERSION_NUM >= 0x070908
 296        if (ssl_capath != NULL)
 297                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 298#endif
 299        if (ssl_cainfo != NULL)
 300                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 301
 302        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 303                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 304                                 curl_low_speed_limit);
 305                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 306                                 curl_low_speed_time);
 307        }
 308
 309        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 310#if LIBCURL_VERSION_NUM >= 0x071301
 311        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 312#elif LIBCURL_VERSION_NUM >= 0x071101
 313        curl_easy_setopt(result, CURLOPT_POST301, 1);
 314#endif
 315
 316        if (getenv("GIT_CURL_VERBOSE"))
 317                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 318
 319        curl_easy_setopt(result, CURLOPT_USERAGENT,
 320                user_agent ? user_agent : git_user_agent());
 321
 322        if (curl_ftp_no_epsv)
 323                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 324
 325#ifdef CURLOPT_USE_SSL
 326        if (curl_ssl_try)
 327                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 328#endif
 329
 330        if (curl_http_proxy) {
 331                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 332                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 333        }
 334
 335        return result;
 336}
 337
 338static void set_from_env(const char **var, const char *envname)
 339{
 340        const char *val = getenv(envname);
 341        if (val)
 342                *var = val;
 343}
 344
 345void http_init(struct remote *remote, const char *url, int proactive_auth)
 346{
 347        char *low_speed_limit;
 348        char *low_speed_time;
 349        char *normalized_url;
 350        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 351
 352        config.section = "http";
 353        config.key = NULL;
 354        config.collect_fn = http_options;
 355        config.cascade_fn = git_default_config;
 356        config.cb = NULL;
 357
 358        http_is_verbose = 0;
 359        normalized_url = url_normalize(url, &config.url);
 360
 361        git_config(urlmatch_config_entry, &config);
 362        free(normalized_url);
 363
 364        curl_global_init(CURL_GLOBAL_ALL);
 365
 366        http_proactive_auth = proactive_auth;
 367
 368        if (remote && remote->http_proxy)
 369                curl_http_proxy = xstrdup(remote->http_proxy);
 370
 371        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 372        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 373
 374#ifdef USE_CURL_MULTI
 375        {
 376                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 377                if (http_max_requests != NULL)
 378                        max_requests = atoi(http_max_requests);
 379        }
 380
 381        curlm = curl_multi_init();
 382        if (curlm == NULL) {
 383                fprintf(stderr, "Error creating curl multi handle.\n");
 384                exit(1);
 385        }
 386#endif
 387
 388        if (getenv("GIT_SSL_NO_VERIFY"))
 389                curl_ssl_verify = 0;
 390
 391        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 392#if LIBCURL_VERSION_NUM >= 0x070903
 393        set_from_env(&ssl_key, "GIT_SSL_KEY");
 394#endif
 395#if LIBCURL_VERSION_NUM >= 0x070908
 396        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 397#endif
 398        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 399
 400        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 401
 402        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 403        if (low_speed_limit != NULL)
 404                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 405        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 406        if (low_speed_time != NULL)
 407                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 408
 409        if (curl_ssl_verify == -1)
 410                curl_ssl_verify = 1;
 411
 412        curl_session_count = 0;
 413#ifdef USE_CURL_MULTI
 414        if (max_requests < 1)
 415                max_requests = DEFAULT_MAX_REQUESTS;
 416#endif
 417
 418        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 419                curl_ftp_no_epsv = 1;
 420
 421        if (url) {
 422                credential_from_url(&http_auth, url);
 423                if (!ssl_cert_password_required &&
 424                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 425                    !prefixcmp(url, "https://"))
 426                        ssl_cert_password_required = 1;
 427        }
 428
 429#ifndef NO_CURL_EASY_DUPHANDLE
 430        curl_default = get_curl_handle();
 431#endif
 432}
 433
 434void http_cleanup(void)
 435{
 436        struct active_request_slot *slot = active_queue_head;
 437
 438        while (slot != NULL) {
 439                struct active_request_slot *next = slot->next;
 440                if (slot->curl != NULL) {
 441#ifdef USE_CURL_MULTI
 442                        curl_multi_remove_handle(curlm, slot->curl);
 443#endif
 444                        curl_easy_cleanup(slot->curl);
 445                }
 446                free(slot);
 447                slot = next;
 448        }
 449        active_queue_head = NULL;
 450
 451#ifndef NO_CURL_EASY_DUPHANDLE
 452        curl_easy_cleanup(curl_default);
 453#endif
 454
 455#ifdef USE_CURL_MULTI
 456        curl_multi_cleanup(curlm);
 457#endif
 458        curl_global_cleanup();
 459
 460        curl_slist_free_all(pragma_header);
 461        pragma_header = NULL;
 462
 463        curl_slist_free_all(no_pragma_header);
 464        no_pragma_header = NULL;
 465
 466        if (curl_http_proxy) {
 467                free((void *)curl_http_proxy);
 468                curl_http_proxy = NULL;
 469        }
 470
 471        if (cert_auth.password != NULL) {
 472                memset(cert_auth.password, 0, strlen(cert_auth.password));
 473                free(cert_auth.password);
 474                cert_auth.password = NULL;
 475        }
 476        ssl_cert_password_required = 0;
 477}
 478
 479struct active_request_slot *get_active_slot(void)
 480{
 481        struct active_request_slot *slot = active_queue_head;
 482        struct active_request_slot *newslot;
 483
 484#ifdef USE_CURL_MULTI
 485        int num_transfers;
 486
 487        /* Wait for a slot to open up if the queue is full */
 488        while (active_requests >= max_requests) {
 489                curl_multi_perform(curlm, &num_transfers);
 490                if (num_transfers < active_requests)
 491                        process_curl_messages();
 492        }
 493#endif
 494
 495        while (slot != NULL && slot->in_use)
 496                slot = slot->next;
 497
 498        if (slot == NULL) {
 499                newslot = xmalloc(sizeof(*newslot));
 500                newslot->curl = NULL;
 501                newslot->in_use = 0;
 502                newslot->next = NULL;
 503
 504                slot = active_queue_head;
 505                if (slot == NULL) {
 506                        active_queue_head = newslot;
 507                } else {
 508                        while (slot->next != NULL)
 509                                slot = slot->next;
 510                        slot->next = newslot;
 511                }
 512                slot = newslot;
 513        }
 514
 515        if (slot->curl == NULL) {
 516#ifdef NO_CURL_EASY_DUPHANDLE
 517                slot->curl = get_curl_handle();
 518#else
 519                slot->curl = curl_easy_duphandle(curl_default);
 520#endif
 521                curl_session_count++;
 522        }
 523
 524        active_requests++;
 525        slot->in_use = 1;
 526        slot->results = NULL;
 527        slot->finished = NULL;
 528        slot->callback_data = NULL;
 529        slot->callback_func = NULL;
 530        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 531        if (curl_save_cookies)
 532                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 533        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 534        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 535        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 536        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 537        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 538        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 539        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 540        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 541        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 542        if (http_auth.password)
 543                init_curl_http_auth(slot->curl);
 544
 545        return slot;
 546}
 547
 548int start_active_slot(struct active_request_slot *slot)
 549{
 550#ifdef USE_CURL_MULTI
 551        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 552        int num_transfers;
 553
 554        if (curlm_result != CURLM_OK &&
 555            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 556                active_requests--;
 557                slot->in_use = 0;
 558                return 0;
 559        }
 560
 561        /*
 562         * We know there must be something to do, since we just added
 563         * something.
 564         */
 565        curl_multi_perform(curlm, &num_transfers);
 566#endif
 567        return 1;
 568}
 569
 570#ifdef USE_CURL_MULTI
 571struct fill_chain {
 572        void *data;
 573        int (*fill)(void *);
 574        struct fill_chain *next;
 575};
 576
 577static struct fill_chain *fill_cfg;
 578
 579void add_fill_function(void *data, int (*fill)(void *))
 580{
 581        struct fill_chain *new = xmalloc(sizeof(*new));
 582        struct fill_chain **linkp = &fill_cfg;
 583        new->data = data;
 584        new->fill = fill;
 585        new->next = NULL;
 586        while (*linkp)
 587                linkp = &(*linkp)->next;
 588        *linkp = new;
 589}
 590
 591void fill_active_slots(void)
 592{
 593        struct active_request_slot *slot = active_queue_head;
 594
 595        while (active_requests < max_requests) {
 596                struct fill_chain *fill;
 597                for (fill = fill_cfg; fill; fill = fill->next)
 598                        if (fill->fill(fill->data))
 599                                break;
 600
 601                if (!fill)
 602                        break;
 603        }
 604
 605        while (slot != NULL) {
 606                if (!slot->in_use && slot->curl != NULL
 607                        && curl_session_count > min_curl_sessions) {
 608                        curl_easy_cleanup(slot->curl);
 609                        slot->curl = NULL;
 610                        curl_session_count--;
 611                }
 612                slot = slot->next;
 613        }
 614}
 615
 616void step_active_slots(void)
 617{
 618        int num_transfers;
 619        CURLMcode curlm_result;
 620
 621        do {
 622                curlm_result = curl_multi_perform(curlm, &num_transfers);
 623        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 624        if (num_transfers < active_requests) {
 625                process_curl_messages();
 626                fill_active_slots();
 627        }
 628}
 629#endif
 630
 631void run_active_slot(struct active_request_slot *slot)
 632{
 633#ifdef USE_CURL_MULTI
 634        fd_set readfds;
 635        fd_set writefds;
 636        fd_set excfds;
 637        int max_fd;
 638        struct timeval select_timeout;
 639        int finished = 0;
 640
 641        slot->finished = &finished;
 642        while (!finished) {
 643                step_active_slots();
 644
 645                if (slot->in_use) {
 646#if LIBCURL_VERSION_NUM >= 0x070f04
 647                        long curl_timeout;
 648                        curl_multi_timeout(curlm, &curl_timeout);
 649                        if (curl_timeout == 0) {
 650                                continue;
 651                        } else if (curl_timeout == -1) {
 652                                select_timeout.tv_sec  = 0;
 653                                select_timeout.tv_usec = 50000;
 654                        } else {
 655                                select_timeout.tv_sec  =  curl_timeout / 1000;
 656                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 657                        }
 658#else
 659                        select_timeout.tv_sec  = 0;
 660                        select_timeout.tv_usec = 50000;
 661#endif
 662
 663                        max_fd = -1;
 664                        FD_ZERO(&readfds);
 665                        FD_ZERO(&writefds);
 666                        FD_ZERO(&excfds);
 667                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 668
 669                        /*
 670                         * It can happen that curl_multi_timeout returns a pathologically
 671                         * long timeout when curl_multi_fdset returns no file descriptors
 672                         * to read.  See commit message for more details.
 673                         */
 674                        if (max_fd < 0 &&
 675                            (select_timeout.tv_sec > 0 ||
 676                             select_timeout.tv_usec > 50000)) {
 677                                select_timeout.tv_sec  = 0;
 678                                select_timeout.tv_usec = 50000;
 679                        }
 680
 681                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 682                }
 683        }
 684#else
 685        while (slot->in_use) {
 686                slot->curl_result = curl_easy_perform(slot->curl);
 687                finish_active_slot(slot);
 688        }
 689#endif
 690}
 691
 692static void closedown_active_slot(struct active_request_slot *slot)
 693{
 694        active_requests--;
 695        slot->in_use = 0;
 696}
 697
 698static void release_active_slot(struct active_request_slot *slot)
 699{
 700        closedown_active_slot(slot);
 701        if (slot->curl && curl_session_count > min_curl_sessions) {
 702#ifdef USE_CURL_MULTI
 703                curl_multi_remove_handle(curlm, slot->curl);
 704#endif
 705                curl_easy_cleanup(slot->curl);
 706                slot->curl = NULL;
 707                curl_session_count--;
 708        }
 709#ifdef USE_CURL_MULTI
 710        fill_active_slots();
 711#endif
 712}
 713
 714void finish_active_slot(struct active_request_slot *slot)
 715{
 716        closedown_active_slot(slot);
 717        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 718
 719        if (slot->finished != NULL)
 720                (*slot->finished) = 1;
 721
 722        /* Store slot results so they can be read after the slot is reused */
 723        if (slot->results != NULL) {
 724                slot->results->curl_result = slot->curl_result;
 725                slot->results->http_code = slot->http_code;
 726        }
 727
 728        /* Run callback if appropriate */
 729        if (slot->callback_func != NULL)
 730                slot->callback_func(slot->callback_data);
 731}
 732
 733void finish_all_active_slots(void)
 734{
 735        struct active_request_slot *slot = active_queue_head;
 736
 737        while (slot != NULL)
 738                if (slot->in_use) {
 739                        run_active_slot(slot);
 740                        slot = active_queue_head;
 741                } else {
 742                        slot = slot->next;
 743                }
 744}
 745
 746/* Helpers for modifying and creating URLs */
 747static inline int needs_quote(int ch)
 748{
 749        if (((ch >= 'A') && (ch <= 'Z'))
 750                        || ((ch >= 'a') && (ch <= 'z'))
 751                        || ((ch >= '0') && (ch <= '9'))
 752                        || (ch == '/')
 753                        || (ch == '-')
 754                        || (ch == '.'))
 755                return 0;
 756        return 1;
 757}
 758
 759static char *quote_ref_url(const char *base, const char *ref)
 760{
 761        struct strbuf buf = STRBUF_INIT;
 762        const char *cp;
 763        int ch;
 764
 765        end_url_with_slash(&buf, base);
 766
 767        for (cp = ref; (ch = *cp) != 0; cp++)
 768                if (needs_quote(ch))
 769                        strbuf_addf(&buf, "%%%02x", ch);
 770                else
 771                        strbuf_addch(&buf, *cp);
 772
 773        return strbuf_detach(&buf, NULL);
 774}
 775
 776void append_remote_object_url(struct strbuf *buf, const char *url,
 777                              const char *hex,
 778                              int only_two_digit_prefix)
 779{
 780        end_url_with_slash(buf, url);
 781
 782        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 783        if (!only_two_digit_prefix)
 784                strbuf_addf(buf, "%s", hex+2);
 785}
 786
 787char *get_remote_object_url(const char *url, const char *hex,
 788                            int only_two_digit_prefix)
 789{
 790        struct strbuf buf = STRBUF_INIT;
 791        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 792        return strbuf_detach(&buf, NULL);
 793}
 794
 795int handle_curl_result(struct slot_results *results)
 796{
 797        /*
 798         * If we see a failing http code with CURLE_OK, we have turned off
 799         * FAILONERROR (to keep the server's custom error response), and should
 800         * translate the code into failure here.
 801         */
 802        if (results->curl_result == CURLE_OK &&
 803            results->http_code >= 400) {
 804                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
 805                /*
 806                 * Normally curl will already have put the "reason phrase"
 807                 * from the server into curl_errorstr; unfortunately without
 808                 * FAILONERROR it is lost, so we can give only the numeric
 809                 * status code.
 810                 */
 811                snprintf(curl_errorstr, sizeof(curl_errorstr),
 812                         "The requested URL returned error: %ld",
 813                         results->http_code);
 814        }
 815
 816        if (results->curl_result == CURLE_OK) {
 817                credential_approve(&http_auth);
 818                return HTTP_OK;
 819        } else if (missing_target(results))
 820                return HTTP_MISSING_TARGET;
 821        else if (results->http_code == 401) {
 822                if (http_auth.username && http_auth.password) {
 823                        credential_reject(&http_auth);
 824                        return HTTP_NOAUTH;
 825                } else {
 826                        credential_fill(&http_auth);
 827                        return HTTP_REAUTH;
 828                }
 829        } else {
 830#if LIBCURL_VERSION_NUM >= 0x070c00
 831                if (!curl_errorstr[0])
 832                        strlcpy(curl_errorstr,
 833                                curl_easy_strerror(results->curl_result),
 834                                sizeof(curl_errorstr));
 835#endif
 836                return HTTP_ERROR;
 837        }
 838}
 839
 840/* http_request() targets */
 841#define HTTP_REQUEST_STRBUF     0
 842#define HTTP_REQUEST_FILE       1
 843
 844static int http_request(const char *url, struct strbuf *type,
 845                        void *result, int target, int options)
 846{
 847        struct active_request_slot *slot;
 848        struct slot_results results;
 849        struct curl_slist *headers = NULL;
 850        struct strbuf buf = STRBUF_INIT;
 851        int ret;
 852
 853        slot = get_active_slot();
 854        slot->results = &results;
 855        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 856
 857        if (result == NULL) {
 858                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 859        } else {
 860                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 861                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 862
 863                if (target == HTTP_REQUEST_FILE) {
 864                        long posn = ftell(result);
 865                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 866                                         fwrite);
 867                        if (posn > 0) {
 868                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 869                                headers = curl_slist_append(headers, buf.buf);
 870                                strbuf_reset(&buf);
 871                        }
 872                } else
 873                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 874                                         fwrite_buffer);
 875        }
 876
 877        strbuf_addstr(&buf, "Pragma:");
 878        if (options & HTTP_NO_CACHE)
 879                strbuf_addstr(&buf, " no-cache");
 880        if (options & HTTP_KEEP_ERROR)
 881                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 882
 883        headers = curl_slist_append(headers, buf.buf);
 884
 885        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 886        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 887        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 888
 889        if (start_active_slot(slot)) {
 890                run_active_slot(slot);
 891                ret = handle_curl_result(&results);
 892        } else {
 893                snprintf(curl_errorstr, sizeof(curl_errorstr),
 894                         "failed to start HTTP request");
 895                ret = HTTP_START_FAILED;
 896        }
 897
 898        if (type) {
 899                char *t;
 900                strbuf_reset(type);
 901                curl_easy_getinfo(slot->curl, CURLINFO_CONTENT_TYPE, &t);
 902                if (t)
 903                        strbuf_addstr(type, t);
 904        }
 905
 906        curl_slist_free_all(headers);
 907        strbuf_release(&buf);
 908
 909        return ret;
 910}
 911
 912static int http_request_reauth(const char *url,
 913                               struct strbuf *type,
 914                               void *result, int target,
 915                               int options)
 916{
 917        int ret = http_request(url, type, result, target, options);
 918        if (ret != HTTP_REAUTH)
 919                return ret;
 920
 921        /*
 922         * If we are using KEEP_ERROR, the previous request may have
 923         * put cruft into our output stream; we should clear it out before
 924         * making our next request. We only know how to do this for
 925         * the strbuf case, but that is enough to satisfy current callers.
 926         */
 927        if (options & HTTP_KEEP_ERROR) {
 928                switch (target) {
 929                case HTTP_REQUEST_STRBUF:
 930                        strbuf_reset(result);
 931                        break;
 932                default:
 933                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
 934                }
 935        }
 936        return http_request(url, type, result, target, options);
 937}
 938
 939int http_get_strbuf(const char *url,
 940                    struct strbuf *type,
 941                    struct strbuf *result, int options)
 942{
 943        return http_request_reauth(url, type, result,
 944                                   HTTP_REQUEST_STRBUF, options);
 945}
 946
 947/*
 948 * Downloads a URL and stores the result in the given file.
 949 *
 950 * If a previous interrupted download is detected (i.e. a previous temporary
 951 * file is still around) the download is resumed.
 952 */
 953static int http_get_file(const char *url, const char *filename, int options)
 954{
 955        int ret;
 956        struct strbuf tmpfile = STRBUF_INIT;
 957        FILE *result;
 958
 959        strbuf_addf(&tmpfile, "%s.temp", filename);
 960        result = fopen(tmpfile.buf, "a");
 961        if (! result) {
 962                error("Unable to open local file %s", tmpfile.buf);
 963                ret = HTTP_ERROR;
 964                goto cleanup;
 965        }
 966
 967        ret = http_request_reauth(url, NULL, result, HTTP_REQUEST_FILE, options);
 968        fclose(result);
 969
 970        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 971                ret = HTTP_ERROR;
 972cleanup:
 973        strbuf_release(&tmpfile);
 974        return ret;
 975}
 976
 977int http_fetch_ref(const char *base, struct ref *ref)
 978{
 979        char *url;
 980        struct strbuf buffer = STRBUF_INIT;
 981        int ret = -1;
 982
 983        url = quote_ref_url(base, ref->name);
 984        if (http_get_strbuf(url, NULL, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 985                strbuf_rtrim(&buffer);
 986                if (buffer.len == 40)
 987                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 988                else if (!prefixcmp(buffer.buf, "ref: ")) {
 989                        ref->symref = xstrdup(buffer.buf + 5);
 990                        ret = 0;
 991                }
 992        }
 993
 994        strbuf_release(&buffer);
 995        free(url);
 996        return ret;
 997}
 998
 999/* Helpers for fetching packs */
1000static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1001{
1002        char *url, *tmp;
1003        struct strbuf buf = STRBUF_INIT;
1004
1005        if (http_is_verbose)
1006                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1007
1008        end_url_with_slash(&buf, base_url);
1009        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1010        url = strbuf_detach(&buf, NULL);
1011
1012        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1013        tmp = strbuf_detach(&buf, NULL);
1014
1015        if (http_get_file(url, tmp, 0) != HTTP_OK) {
1016                error("Unable to get pack index %s", url);
1017                free(tmp);
1018                tmp = NULL;
1019        }
1020
1021        free(url);
1022        return tmp;
1023}
1024
1025static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1026        unsigned char *sha1, const char *base_url)
1027{
1028        struct packed_git *new_pack;
1029        char *tmp_idx = NULL;
1030        int ret;
1031
1032        if (has_pack_index(sha1)) {
1033                new_pack = parse_pack_index(sha1, NULL);
1034                if (!new_pack)
1035                        return -1; /* parse_pack_index() already issued error message */
1036                goto add_pack;
1037        }
1038
1039        tmp_idx = fetch_pack_index(sha1, base_url);
1040        if (!tmp_idx)
1041                return -1;
1042
1043        new_pack = parse_pack_index(sha1, tmp_idx);
1044        if (!new_pack) {
1045                unlink(tmp_idx);
1046                free(tmp_idx);
1047
1048                return -1; /* parse_pack_index() already issued error message */
1049        }
1050
1051        ret = verify_pack_index(new_pack);
1052        if (!ret) {
1053                close_pack_index(new_pack);
1054                ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1055        }
1056        free(tmp_idx);
1057        if (ret)
1058                return -1;
1059
1060add_pack:
1061        new_pack->next = *packs_head;
1062        *packs_head = new_pack;
1063        return 0;
1064}
1065
1066int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1067{
1068        int ret = 0, i = 0;
1069        char *url, *data;
1070        struct strbuf buf = STRBUF_INIT;
1071        unsigned char sha1[20];
1072
1073        end_url_with_slash(&buf, base_url);
1074        strbuf_addstr(&buf, "objects/info/packs");
1075        url = strbuf_detach(&buf, NULL);
1076
1077        ret = http_get_strbuf(url, NULL, &buf, HTTP_NO_CACHE);
1078        if (ret != HTTP_OK)
1079                goto cleanup;
1080
1081        data = buf.buf;
1082        while (i < buf.len) {
1083                switch (data[i]) {
1084                case 'P':
1085                        i++;
1086                        if (i + 52 <= buf.len &&
1087                            !prefixcmp(data + i, " pack-") &&
1088                            !prefixcmp(data + i + 46, ".pack\n")) {
1089                                get_sha1_hex(data + i + 6, sha1);
1090                                fetch_and_setup_pack_index(packs_head, sha1,
1091                                                      base_url);
1092                                i += 51;
1093                                break;
1094                        }
1095                default:
1096                        while (i < buf.len && data[i] != '\n')
1097                                i++;
1098                }
1099                i++;
1100        }
1101
1102cleanup:
1103        free(url);
1104        return ret;
1105}
1106
1107void release_http_pack_request(struct http_pack_request *preq)
1108{
1109        if (preq->packfile != NULL) {
1110                fclose(preq->packfile);
1111                preq->packfile = NULL;
1112        }
1113        if (preq->range_header != NULL) {
1114                curl_slist_free_all(preq->range_header);
1115                preq->range_header = NULL;
1116        }
1117        preq->slot = NULL;
1118        free(preq->url);
1119}
1120
1121int finish_http_pack_request(struct http_pack_request *preq)
1122{
1123        struct packed_git **lst;
1124        struct packed_git *p = preq->target;
1125        char *tmp_idx;
1126        struct child_process ip;
1127        const char *ip_argv[8];
1128
1129        close_pack_index(p);
1130
1131        fclose(preq->packfile);
1132        preq->packfile = NULL;
1133
1134        lst = preq->lst;
1135        while (*lst != p)
1136                lst = &((*lst)->next);
1137        *lst = (*lst)->next;
1138
1139        tmp_idx = xstrdup(preq->tmpfile);
1140        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1141               ".idx.temp");
1142
1143        ip_argv[0] = "index-pack";
1144        ip_argv[1] = "-o";
1145        ip_argv[2] = tmp_idx;
1146        ip_argv[3] = preq->tmpfile;
1147        ip_argv[4] = NULL;
1148
1149        memset(&ip, 0, sizeof(ip));
1150        ip.argv = ip_argv;
1151        ip.git_cmd = 1;
1152        ip.no_stdin = 1;
1153        ip.no_stdout = 1;
1154
1155        if (run_command(&ip)) {
1156                unlink(preq->tmpfile);
1157                unlink(tmp_idx);
1158                free(tmp_idx);
1159                return -1;
1160        }
1161
1162        unlink(sha1_pack_index_name(p->sha1));
1163
1164        if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1165         || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1166                free(tmp_idx);
1167                return -1;
1168        }
1169
1170        install_packed_git(p);
1171        free(tmp_idx);
1172        return 0;
1173}
1174
1175struct http_pack_request *new_http_pack_request(
1176        struct packed_git *target, const char *base_url)
1177{
1178        long prev_posn = 0;
1179        char range[RANGE_HEADER_SIZE];
1180        struct strbuf buf = STRBUF_INIT;
1181        struct http_pack_request *preq;
1182
1183        preq = xcalloc(1, sizeof(*preq));
1184        preq->target = target;
1185
1186        end_url_with_slash(&buf, base_url);
1187        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1188                sha1_to_hex(target->sha1));
1189        preq->url = strbuf_detach(&buf, NULL);
1190
1191        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1192                sha1_pack_name(target->sha1));
1193        preq->packfile = fopen(preq->tmpfile, "a");
1194        if (!preq->packfile) {
1195                error("Unable to open local file %s for pack",
1196                      preq->tmpfile);
1197                goto abort;
1198        }
1199
1200        preq->slot = get_active_slot();
1201        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1202        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1203        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1204        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1205                no_pragma_header);
1206
1207        /*
1208         * If there is data present from a previous transfer attempt,
1209         * resume where it left off
1210         */
1211        prev_posn = ftell(preq->packfile);
1212        if (prev_posn>0) {
1213                if (http_is_verbose)
1214                        fprintf(stderr,
1215                                "Resuming fetch of pack %s at byte %ld\n",
1216                                sha1_to_hex(target->sha1), prev_posn);
1217                sprintf(range, "Range: bytes=%ld-", prev_posn);
1218                preq->range_header = curl_slist_append(NULL, range);
1219                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1220                        preq->range_header);
1221        }
1222
1223        return preq;
1224
1225abort:
1226        free(preq->url);
1227        free(preq);
1228        return NULL;
1229}
1230
1231/* Helpers for fetching objects (loose) */
1232static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1233                               void *data)
1234{
1235        unsigned char expn[4096];
1236        size_t size = eltsize * nmemb;
1237        int posn = 0;
1238        struct http_object_request *freq =
1239                (struct http_object_request *)data;
1240        do {
1241                ssize_t retval = xwrite(freq->localfile,
1242                                        (char *) ptr + posn, size - posn);
1243                if (retval < 0)
1244                        return posn;
1245                posn += retval;
1246        } while (posn < size);
1247
1248        freq->stream.avail_in = size;
1249        freq->stream.next_in = (void *)ptr;
1250        do {
1251                freq->stream.next_out = expn;
1252                freq->stream.avail_out = sizeof(expn);
1253                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1254                git_SHA1_Update(&freq->c, expn,
1255                                sizeof(expn) - freq->stream.avail_out);
1256        } while (freq->stream.avail_in && freq->zret == Z_OK);
1257        return size;
1258}
1259
1260struct http_object_request *new_http_object_request(const char *base_url,
1261        unsigned char *sha1)
1262{
1263        char *hex = sha1_to_hex(sha1);
1264        char *filename;
1265        char prevfile[PATH_MAX];
1266        int prevlocal;
1267        char prev_buf[PREV_BUF_SIZE];
1268        ssize_t prev_read = 0;
1269        long prev_posn = 0;
1270        char range[RANGE_HEADER_SIZE];
1271        struct curl_slist *range_header = NULL;
1272        struct http_object_request *freq;
1273
1274        freq = xcalloc(1, sizeof(*freq));
1275        hashcpy(freq->sha1, sha1);
1276        freq->localfile = -1;
1277
1278        filename = sha1_file_name(sha1);
1279        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1280                 "%s.temp", filename);
1281
1282        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1283        unlink_or_warn(prevfile);
1284        rename(freq->tmpfile, prevfile);
1285        unlink_or_warn(freq->tmpfile);
1286
1287        if (freq->localfile != -1)
1288                error("fd leakage in start: %d", freq->localfile);
1289        freq->localfile = open(freq->tmpfile,
1290                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1291        /*
1292         * This could have failed due to the "lazy directory creation";
1293         * try to mkdir the last path component.
1294         */
1295        if (freq->localfile < 0 && errno == ENOENT) {
1296                char *dir = strrchr(freq->tmpfile, '/');
1297                if (dir) {
1298                        *dir = 0;
1299                        mkdir(freq->tmpfile, 0777);
1300                        *dir = '/';
1301                }
1302                freq->localfile = open(freq->tmpfile,
1303                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1304        }
1305
1306        if (freq->localfile < 0) {
1307                error("Couldn't create temporary file %s: %s",
1308                      freq->tmpfile, strerror(errno));
1309                goto abort;
1310        }
1311
1312        git_inflate_init(&freq->stream);
1313
1314        git_SHA1_Init(&freq->c);
1315
1316        freq->url = get_remote_object_url(base_url, hex, 0);
1317
1318        /*
1319         * If a previous temp file is present, process what was already
1320         * fetched.
1321         */
1322        prevlocal = open(prevfile, O_RDONLY);
1323        if (prevlocal != -1) {
1324                do {
1325                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1326                        if (prev_read>0) {
1327                                if (fwrite_sha1_file(prev_buf,
1328                                                     1,
1329                                                     prev_read,
1330                                                     freq) == prev_read) {
1331                                        prev_posn += prev_read;
1332                                } else {
1333                                        prev_read = -1;
1334                                }
1335                        }
1336                } while (prev_read > 0);
1337                close(prevlocal);
1338        }
1339        unlink_or_warn(prevfile);
1340
1341        /*
1342         * Reset inflate/SHA1 if there was an error reading the previous temp
1343         * file; also rewind to the beginning of the local file.
1344         */
1345        if (prev_read == -1) {
1346                memset(&freq->stream, 0, sizeof(freq->stream));
1347                git_inflate_init(&freq->stream);
1348                git_SHA1_Init(&freq->c);
1349                if (prev_posn>0) {
1350                        prev_posn = 0;
1351                        lseek(freq->localfile, 0, SEEK_SET);
1352                        if (ftruncate(freq->localfile, 0) < 0) {
1353                                error("Couldn't truncate temporary file %s: %s",
1354                                          freq->tmpfile, strerror(errno));
1355                                goto abort;
1356                        }
1357                }
1358        }
1359
1360        freq->slot = get_active_slot();
1361
1362        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1363        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1364        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1365        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1366        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1367
1368        /*
1369         * If we have successfully processed data from a previous fetch
1370         * attempt, only fetch the data we don't already have.
1371         */
1372        if (prev_posn>0) {
1373                if (http_is_verbose)
1374                        fprintf(stderr,
1375                                "Resuming fetch of object %s at byte %ld\n",
1376                                hex, prev_posn);
1377                sprintf(range, "Range: bytes=%ld-", prev_posn);
1378                range_header = curl_slist_append(range_header, range);
1379                curl_easy_setopt(freq->slot->curl,
1380                                 CURLOPT_HTTPHEADER, range_header);
1381        }
1382
1383        return freq;
1384
1385abort:
1386        free(freq->url);
1387        free(freq);
1388        return NULL;
1389}
1390
1391void process_http_object_request(struct http_object_request *freq)
1392{
1393        if (freq->slot == NULL)
1394                return;
1395        freq->curl_result = freq->slot->curl_result;
1396        freq->http_code = freq->slot->http_code;
1397        freq->slot = NULL;
1398}
1399
1400int finish_http_object_request(struct http_object_request *freq)
1401{
1402        struct stat st;
1403
1404        close(freq->localfile);
1405        freq->localfile = -1;
1406
1407        process_http_object_request(freq);
1408
1409        if (freq->http_code == 416) {
1410                warning("requested range invalid; we may already have all the data.");
1411        } else if (freq->curl_result != CURLE_OK) {
1412                if (stat(freq->tmpfile, &st) == 0)
1413                        if (st.st_size == 0)
1414                                unlink_or_warn(freq->tmpfile);
1415                return -1;
1416        }
1417
1418        git_inflate_end(&freq->stream);
1419        git_SHA1_Final(freq->real_sha1, &freq->c);
1420        if (freq->zret != Z_STREAM_END) {
1421                unlink_or_warn(freq->tmpfile);
1422                return -1;
1423        }
1424        if (hashcmp(freq->sha1, freq->real_sha1)) {
1425                unlink_or_warn(freq->tmpfile);
1426                return -1;
1427        }
1428        freq->rename =
1429                move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1430
1431        return freq->rename;
1432}
1433
1434void abort_http_object_request(struct http_object_request *freq)
1435{
1436        unlink_or_warn(freq->tmpfile);
1437
1438        release_http_object_request(freq);
1439}
1440
1441void release_http_object_request(struct http_object_request *freq)
1442{
1443        if (freq->localfile != -1) {
1444                close(freq->localfile);
1445                freq->localfile = -1;
1446        }
1447        if (freq->url != NULL) {
1448                free(freq->url);
1449                freq->url = NULL;
1450        }
1451        if (freq->slot != NULL) {
1452                freq->slot->callback_func = NULL;
1453                freq->slot->callback_data = NULL;
1454                release_active_slot(freq->slot);
1455                freq->slot = NULL;
1456        }
1457}