Andrew's git / gitweb.git / http.c
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http.con commit Merge branch 'jl/submodule-mv' (b02f5ae)
   1#include "http.h"
   2#include "pack.h"
   3#include "sideband.h"
   4#include "run-command.h"
   5#include "url.h"
   6#include "credential.h"
   7#include "version.h"
   8#include "pkt-line.h"
   9
  10int active_requests;
  11int http_is_verbose;
  12size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  13
  14#if LIBCURL_VERSION_NUM >= 0x070a06
  15#define LIBCURL_CAN_HANDLE_AUTH_ANY
  16#endif
  17
  18static int min_curl_sessions = 1;
  19static int curl_session_count;
  20#ifdef USE_CURL_MULTI
  21static int max_requests = -1;
  22static CURLM *curlm;
  23#endif
  24#ifndef NO_CURL_EASY_DUPHANDLE
  25static CURL *curl_default;
  26#endif
  27
  28#define PREV_BUF_SIZE 4096
  29#define RANGE_HEADER_SIZE 30
  30
  31char curl_errorstr[CURL_ERROR_SIZE];
  32
  33static int curl_ssl_verify = -1;
  34static int curl_ssl_try;
  35static const char *ssl_cert;
  36#if LIBCURL_VERSION_NUM >= 0x070903
  37static const char *ssl_key;
  38#endif
  39#if LIBCURL_VERSION_NUM >= 0x070908
  40static const char *ssl_capath;
  41#endif
  42static const char *ssl_cainfo;
  43static long curl_low_speed_limit = -1;
  44static long curl_low_speed_time = -1;
  45static int curl_ftp_no_epsv;
  46static const char *curl_http_proxy;
  47static const char *curl_cookie_file;
  48static int curl_save_cookies;
  49static struct credential http_auth = CREDENTIAL_INIT;
  50static int http_proactive_auth;
  51static const char *user_agent;
  52
  53#if LIBCURL_VERSION_NUM >= 0x071700
  54/* Use CURLOPT_KEYPASSWD as is */
  55#elif LIBCURL_VERSION_NUM >= 0x070903
  56#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  57#else
  58#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  59#endif
  60
  61static struct credential cert_auth = CREDENTIAL_INIT;
  62static int ssl_cert_password_required;
  63
  64static struct curl_slist *pragma_header;
  65static struct curl_slist *no_pragma_header;
  66
  67static struct active_request_slot *active_queue_head;
  68
  69size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  70{
  71        size_t size = eltsize * nmemb;
  72        struct buffer *buffer = buffer_;
  73
  74        if (size > buffer->buf.len - buffer->posn)
  75                size = buffer->buf.len - buffer->posn;
  76        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  77        buffer->posn += size;
  78
  79        return size;
  80}
  81
  82#ifndef NO_CURL_IOCTL
  83curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  84{
  85        struct buffer *buffer = clientp;
  86
  87        switch (cmd) {
  88        case CURLIOCMD_NOP:
  89                return CURLIOE_OK;
  90
  91        case CURLIOCMD_RESTARTREAD:
  92                buffer->posn = 0;
  93                return CURLIOE_OK;
  94
  95        default:
  96                return CURLIOE_UNKNOWNCMD;
  97        }
  98}
  99#endif
 100
 101size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 102{
 103        size_t size = eltsize * nmemb;
 104        struct strbuf *buffer = buffer_;
 105
 106        strbuf_add(buffer, ptr, size);
 107        return size;
 108}
 109
 110size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 111{
 112        return eltsize * nmemb;
 113}
 114
 115#ifdef USE_CURL_MULTI
 116static void process_curl_messages(void)
 117{
 118        int num_messages;
 119        struct active_request_slot *slot;
 120        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 121
 122        while (curl_message != NULL) {
 123                if (curl_message->msg == CURLMSG_DONE) {
 124                        int curl_result = curl_message->data.result;
 125                        slot = active_queue_head;
 126                        while (slot != NULL &&
 127                               slot->curl != curl_message->easy_handle)
 128                                slot = slot->next;
 129                        if (slot != NULL) {
 130                                curl_multi_remove_handle(curlm, slot->curl);
 131                                slot->curl_result = curl_result;
 132                                finish_active_slot(slot);
 133                        } else {
 134                                fprintf(stderr, "Received DONE message for unknown request!\n");
 135                        }
 136                } else {
 137                        fprintf(stderr, "Unknown CURL message received: %d\n",
 138                                (int)curl_message->msg);
 139                }
 140                curl_message = curl_multi_info_read(curlm, &num_messages);
 141        }
 142}
 143#endif
 144
 145static int http_options(const char *var, const char *value, void *cb)
 146{
 147        if (!strcmp("http.sslverify", var)) {
 148                curl_ssl_verify = git_config_bool(var, value);
 149                return 0;
 150        }
 151        if (!strcmp("http.sslcert", var))
 152                return git_config_string(&ssl_cert, var, value);
 153#if LIBCURL_VERSION_NUM >= 0x070903
 154        if (!strcmp("http.sslkey", var))
 155                return git_config_string(&ssl_key, var, value);
 156#endif
 157#if LIBCURL_VERSION_NUM >= 0x070908
 158        if (!strcmp("http.sslcapath", var))
 159                return git_config_string(&ssl_capath, var, value);
 160#endif
 161        if (!strcmp("http.sslcainfo", var))
 162                return git_config_string(&ssl_cainfo, var, value);
 163        if (!strcmp("http.sslcertpasswordprotected", var)) {
 164                if (git_config_bool(var, value))
 165                        ssl_cert_password_required = 1;
 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
 350        http_is_verbose = 0;
 351
 352        git_config(http_options, NULL);
 353
 354        curl_global_init(CURL_GLOBAL_ALL);
 355
 356        http_proactive_auth = proactive_auth;
 357
 358        if (remote && remote->http_proxy)
 359                curl_http_proxy = xstrdup(remote->http_proxy);
 360
 361        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 362        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 363
 364#ifdef USE_CURL_MULTI
 365        {
 366                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 367                if (http_max_requests != NULL)
 368                        max_requests = atoi(http_max_requests);
 369        }
 370
 371        curlm = curl_multi_init();
 372        if (curlm == NULL) {
 373                fprintf(stderr, "Error creating curl multi handle.\n");
 374                exit(1);
 375        }
 376#endif
 377
 378        if (getenv("GIT_SSL_NO_VERIFY"))
 379                curl_ssl_verify = 0;
 380
 381        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 382#if LIBCURL_VERSION_NUM >= 0x070903
 383        set_from_env(&ssl_key, "GIT_SSL_KEY");
 384#endif
 385#if LIBCURL_VERSION_NUM >= 0x070908
 386        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 387#endif
 388        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 389
 390        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 391
 392        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 393        if (low_speed_limit != NULL)
 394                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 395        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 396        if (low_speed_time != NULL)
 397                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 398
 399        if (curl_ssl_verify == -1)
 400                curl_ssl_verify = 1;
 401
 402        curl_session_count = 0;
 403#ifdef USE_CURL_MULTI
 404        if (max_requests < 1)
 405                max_requests = DEFAULT_MAX_REQUESTS;
 406#endif
 407
 408        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 409                curl_ftp_no_epsv = 1;
 410
 411        if (url) {
 412                credential_from_url(&http_auth, url);
 413                if (!ssl_cert_password_required &&
 414                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 415                    !prefixcmp(url, "https://"))
 416                        ssl_cert_password_required = 1;
 417        }
 418
 419#ifndef NO_CURL_EASY_DUPHANDLE
 420        curl_default = get_curl_handle();
 421#endif
 422}
 423
 424void http_cleanup(void)
 425{
 426        struct active_request_slot *slot = active_queue_head;
 427
 428        while (slot != NULL) {
 429                struct active_request_slot *next = slot->next;
 430                if (slot->curl != NULL) {
 431#ifdef USE_CURL_MULTI
 432                        curl_multi_remove_handle(curlm, slot->curl);
 433#endif
 434                        curl_easy_cleanup(slot->curl);
 435                }
 436                free(slot);
 437                slot = next;
 438        }
 439        active_queue_head = NULL;
 440
 441#ifndef NO_CURL_EASY_DUPHANDLE
 442        curl_easy_cleanup(curl_default);
 443#endif
 444
 445#ifdef USE_CURL_MULTI
 446        curl_multi_cleanup(curlm);
 447#endif
 448        curl_global_cleanup();
 449
 450        curl_slist_free_all(pragma_header);
 451        pragma_header = NULL;
 452
 453        curl_slist_free_all(no_pragma_header);
 454        no_pragma_header = NULL;
 455
 456        if (curl_http_proxy) {
 457                free((void *)curl_http_proxy);
 458                curl_http_proxy = NULL;
 459        }
 460
 461        if (cert_auth.password != NULL) {
 462                memset(cert_auth.password, 0, strlen(cert_auth.password));
 463                free(cert_auth.password);
 464                cert_auth.password = NULL;
 465        }
 466        ssl_cert_password_required = 0;
 467}
 468
 469struct active_request_slot *get_active_slot(void)
 470{
 471        struct active_request_slot *slot = active_queue_head;
 472        struct active_request_slot *newslot;
 473
 474#ifdef USE_CURL_MULTI
 475        int num_transfers;
 476
 477        /* Wait for a slot to open up if the queue is full */
 478        while (active_requests >= max_requests) {
 479                curl_multi_perform(curlm, &num_transfers);
 480                if (num_transfers < active_requests)
 481                        process_curl_messages();
 482        }
 483#endif
 484
 485        while (slot != NULL && slot->in_use)
 486                slot = slot->next;
 487
 488        if (slot == NULL) {
 489                newslot = xmalloc(sizeof(*newslot));
 490                newslot->curl = NULL;
 491                newslot->in_use = 0;
 492                newslot->next = NULL;
 493
 494                slot = active_queue_head;
 495                if (slot == NULL) {
 496                        active_queue_head = newslot;
 497                } else {
 498                        while (slot->next != NULL)
 499                                slot = slot->next;
 500                        slot->next = newslot;
 501                }
 502                slot = newslot;
 503        }
 504
 505        if (slot->curl == NULL) {
 506#ifdef NO_CURL_EASY_DUPHANDLE
 507                slot->curl = get_curl_handle();
 508#else
 509                slot->curl = curl_easy_duphandle(curl_default);
 510#endif
 511                curl_session_count++;
 512        }
 513
 514        active_requests++;
 515        slot->in_use = 1;
 516        slot->results = NULL;
 517        slot->finished = NULL;
 518        slot->callback_data = NULL;
 519        slot->callback_func = NULL;
 520        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 521        if (curl_save_cookies)
 522                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 523        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 524        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 525        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 526        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 527        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 528        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 529        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 530        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 531        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 532        if (http_auth.password)
 533                init_curl_http_auth(slot->curl);
 534
 535        return slot;
 536}
 537
 538int start_active_slot(struct active_request_slot *slot)
 539{
 540#ifdef USE_CURL_MULTI
 541        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 542        int num_transfers;
 543
 544        if (curlm_result != CURLM_OK &&
 545            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 546                active_requests--;
 547                slot->in_use = 0;
 548                return 0;
 549        }
 550
 551        /*
 552         * We know there must be something to do, since we just added
 553         * something.
 554         */
 555        curl_multi_perform(curlm, &num_transfers);
 556#endif
 557        return 1;
 558}
 559
 560#ifdef USE_CURL_MULTI
 561struct fill_chain {
 562        void *data;
 563        int (*fill)(void *);
 564        struct fill_chain *next;
 565};
 566
 567static struct fill_chain *fill_cfg;
 568
 569void add_fill_function(void *data, int (*fill)(void *))
 570{
 571        struct fill_chain *new = xmalloc(sizeof(*new));
 572        struct fill_chain **linkp = &fill_cfg;
 573        new->data = data;
 574        new->fill = fill;
 575        new->next = NULL;
 576        while (*linkp)
 577                linkp = &(*linkp)->next;
 578        *linkp = new;
 579}
 580
 581void fill_active_slots(void)
 582{
 583        struct active_request_slot *slot = active_queue_head;
 584
 585        while (active_requests < max_requests) {
 586                struct fill_chain *fill;
 587                for (fill = fill_cfg; fill; fill = fill->next)
 588                        if (fill->fill(fill->data))
 589                                break;
 590
 591                if (!fill)
 592                        break;
 593        }
 594
 595        while (slot != NULL) {
 596                if (!slot->in_use && slot->curl != NULL
 597                        && curl_session_count > min_curl_sessions) {
 598                        curl_easy_cleanup(slot->curl);
 599                        slot->curl = NULL;
 600                        curl_session_count--;
 601                }
 602                slot = slot->next;
 603        }
 604}
 605
 606void step_active_slots(void)
 607{
 608        int num_transfers;
 609        CURLMcode curlm_result;
 610
 611        do {
 612                curlm_result = curl_multi_perform(curlm, &num_transfers);
 613        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 614        if (num_transfers < active_requests) {
 615                process_curl_messages();
 616                fill_active_slots();
 617        }
 618}
 619#endif
 620
 621void run_active_slot(struct active_request_slot *slot)
 622{
 623#ifdef USE_CURL_MULTI
 624        fd_set readfds;
 625        fd_set writefds;
 626        fd_set excfds;
 627        int max_fd;
 628        struct timeval select_timeout;
 629        int finished = 0;
 630
 631        slot->finished = &finished;
 632        while (!finished) {
 633                step_active_slots();
 634
 635                if (slot->in_use) {
 636#if LIBCURL_VERSION_NUM >= 0x070f04
 637                        long curl_timeout;
 638                        curl_multi_timeout(curlm, &curl_timeout);
 639                        if (curl_timeout == 0) {
 640                                continue;
 641                        } else if (curl_timeout == -1) {
 642                                select_timeout.tv_sec  = 0;
 643                                select_timeout.tv_usec = 50000;
 644                        } else {
 645                                select_timeout.tv_sec  =  curl_timeout / 1000;
 646                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 647                        }
 648#else
 649                        select_timeout.tv_sec  = 0;
 650                        select_timeout.tv_usec = 50000;
 651#endif
 652
 653                        max_fd = -1;
 654                        FD_ZERO(&readfds);
 655                        FD_ZERO(&writefds);
 656                        FD_ZERO(&excfds);
 657                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 658
 659                        /*
 660                         * It can happen that curl_multi_timeout returns a pathologically
 661                         * long timeout when curl_multi_fdset returns no file descriptors
 662                         * to read.  See commit message for more details.
 663                         */
 664                        if (max_fd < 0 &&
 665                            (select_timeout.tv_sec > 0 ||
 666                             select_timeout.tv_usec > 50000)) {
 667                                select_timeout.tv_sec  = 0;
 668                                select_timeout.tv_usec = 50000;
 669                        }
 670
 671                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 672                }
 673        }
 674#else
 675        while (slot->in_use) {
 676                slot->curl_result = curl_easy_perform(slot->curl);
 677                finish_active_slot(slot);
 678        }
 679#endif
 680}
 681
 682static void closedown_active_slot(struct active_request_slot *slot)
 683{
 684        active_requests--;
 685        slot->in_use = 0;
 686}
 687
 688static void release_active_slot(struct active_request_slot *slot)
 689{
 690        closedown_active_slot(slot);
 691        if (slot->curl && curl_session_count > min_curl_sessions) {
 692#ifdef USE_CURL_MULTI
 693                curl_multi_remove_handle(curlm, slot->curl);
 694#endif
 695                curl_easy_cleanup(slot->curl);
 696                slot->curl = NULL;
 697                curl_session_count--;
 698        }
 699#ifdef USE_CURL_MULTI
 700        fill_active_slots();
 701#endif
 702}
 703
 704void finish_active_slot(struct active_request_slot *slot)
 705{
 706        closedown_active_slot(slot);
 707        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 708
 709        if (slot->finished != NULL)
 710                (*slot->finished) = 1;
 711
 712        /* Store slot results so they can be read after the slot is reused */
 713        if (slot->results != NULL) {
 714                slot->results->curl_result = slot->curl_result;
 715                slot->results->http_code = slot->http_code;
 716        }
 717
 718        /* Run callback if appropriate */
 719        if (slot->callback_func != NULL)
 720                slot->callback_func(slot->callback_data);
 721}
 722
 723void finish_all_active_slots(void)
 724{
 725        struct active_request_slot *slot = active_queue_head;
 726
 727        while (slot != NULL)
 728                if (slot->in_use) {
 729                        run_active_slot(slot);
 730                        slot = active_queue_head;
 731                } else {
 732                        slot = slot->next;
 733                }
 734}
 735
 736/* Helpers for modifying and creating URLs */
 737static inline int needs_quote(int ch)
 738{
 739        if (((ch >= 'A') && (ch <= 'Z'))
 740                        || ((ch >= 'a') && (ch <= 'z'))
 741                        || ((ch >= '0') && (ch <= '9'))
 742                        || (ch == '/')
 743                        || (ch == '-')
 744                        || (ch == '.'))
 745                return 0;
 746        return 1;
 747}
 748
 749static char *quote_ref_url(const char *base, const char *ref)
 750{
 751        struct strbuf buf = STRBUF_INIT;
 752        const char *cp;
 753        int ch;
 754
 755        end_url_with_slash(&buf, base);
 756
 757        for (cp = ref; (ch = *cp) != 0; cp++)
 758                if (needs_quote(ch))
 759                        strbuf_addf(&buf, "%%%02x", ch);
 760                else
 761                        strbuf_addch(&buf, *cp);
 762
 763        return strbuf_detach(&buf, NULL);
 764}
 765
 766void append_remote_object_url(struct strbuf *buf, const char *url,
 767                              const char *hex,
 768                              int only_two_digit_prefix)
 769{
 770        end_url_with_slash(buf, url);
 771
 772        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 773        if (!only_two_digit_prefix)
 774                strbuf_addf(buf, "%s", hex+2);
 775}
 776
 777char *get_remote_object_url(const char *url, const char *hex,
 778                            int only_two_digit_prefix)
 779{
 780        struct strbuf buf = STRBUF_INIT;
 781        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 782        return strbuf_detach(&buf, NULL);
 783}
 784
 785int handle_curl_result(struct slot_results *results)
 786{
 787        /*
 788         * If we see a failing http code with CURLE_OK, we have turned off
 789         * FAILONERROR (to keep the server's custom error response), and should
 790         * translate the code into failure here.
 791         */
 792        if (results->curl_result == CURLE_OK &&
 793            results->http_code >= 400) {
 794                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
 795                /*
 796                 * Normally curl will already have put the "reason phrase"
 797                 * from the server into curl_errorstr; unfortunately without
 798                 * FAILONERROR it is lost, so we can give only the numeric
 799                 * status code.
 800                 */
 801                snprintf(curl_errorstr, sizeof(curl_errorstr),
 802                         "The requested URL returned error: %ld",
 803                         results->http_code);
 804        }
 805
 806        if (results->curl_result == CURLE_OK) {
 807                credential_approve(&http_auth);
 808                return HTTP_OK;
 809        } else if (missing_target(results))
 810                return HTTP_MISSING_TARGET;
 811        else if (results->http_code == 401) {
 812                if (http_auth.username && http_auth.password) {
 813                        credential_reject(&http_auth);
 814                        return HTTP_NOAUTH;
 815                } else {
 816                        credential_fill(&http_auth);
 817                        return HTTP_REAUTH;
 818                }
 819        } else {
 820#if LIBCURL_VERSION_NUM >= 0x070c00
 821                if (!curl_errorstr[0])
 822                        strlcpy(curl_errorstr,
 823                                curl_easy_strerror(results->curl_result),
 824                                sizeof(curl_errorstr));
 825#endif
 826                return HTTP_ERROR;
 827        }
 828}
 829
 830/* http_request() targets */
 831#define HTTP_REQUEST_STRBUF     0
 832#define HTTP_REQUEST_FILE       1
 833
 834static int http_request(const char *url, struct strbuf *type,
 835                        void *result, int target, int options)
 836{
 837        struct active_request_slot *slot;
 838        struct slot_results results;
 839        struct curl_slist *headers = NULL;
 840        struct strbuf buf = STRBUF_INIT;
 841        int ret;
 842
 843        slot = get_active_slot();
 844        slot->results = &results;
 845        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 846
 847        if (result == NULL) {
 848                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 849        } else {
 850                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 851                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 852
 853                if (target == HTTP_REQUEST_FILE) {
 854                        long posn = ftell(result);
 855                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 856                                         fwrite);
 857                        if (posn > 0) {
 858                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 859                                headers = curl_slist_append(headers, buf.buf);
 860                                strbuf_reset(&buf);
 861                        }
 862                } else
 863                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 864                                         fwrite_buffer);
 865        }
 866
 867        strbuf_addstr(&buf, "Pragma:");
 868        if (options & HTTP_NO_CACHE)
 869                strbuf_addstr(&buf, " no-cache");
 870        if (options & HTTP_KEEP_ERROR)
 871                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 872
 873        headers = curl_slist_append(headers, buf.buf);
 874
 875        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 876        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 877        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 878
 879        if (start_active_slot(slot)) {
 880                run_active_slot(slot);
 881                ret = handle_curl_result(&results);
 882        } else {
 883                snprintf(curl_errorstr, sizeof(curl_errorstr),
 884                         "failed to start HTTP request");
 885                ret = HTTP_START_FAILED;
 886        }
 887
 888        if (type) {
 889                char *t;
 890                strbuf_reset(type);
 891                curl_easy_getinfo(slot->curl, CURLINFO_CONTENT_TYPE, &t);
 892                if (t)
 893                        strbuf_addstr(type, t);
 894        }
 895
 896        curl_slist_free_all(headers);
 897        strbuf_release(&buf);
 898
 899        return ret;
 900}
 901
 902static int http_request_reauth(const char *url,
 903                               struct strbuf *type,
 904                               void *result, int target,
 905                               int options)
 906{
 907        int ret = http_request(url, type, result, target, options);
 908        if (ret != HTTP_REAUTH)
 909                return ret;
 910
 911        /*
 912         * If we are using KEEP_ERROR, the previous request may have
 913         * put cruft into our output stream; we should clear it out before
 914         * making our next request. We only know how to do this for
 915         * the strbuf case, but that is enough to satisfy current callers.
 916         */
 917        if (options & HTTP_KEEP_ERROR) {
 918                switch (target) {
 919                case HTTP_REQUEST_STRBUF:
 920                        strbuf_reset(result);
 921                        break;
 922                default:
 923                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
 924                }
 925        }
 926        return http_request(url, type, result, target, options);
 927}
 928
 929int http_get_strbuf(const char *url,
 930                    struct strbuf *type,
 931                    struct strbuf *result, int options)
 932{
 933        return http_request_reauth(url, type, result,
 934                                   HTTP_REQUEST_STRBUF, options);
 935}
 936
 937/*
 938 * Downloads a URL and stores the result in the given file.
 939 *
 940 * If a previous interrupted download is detected (i.e. a previous temporary
 941 * file is still around) the download is resumed.
 942 */
 943static int http_get_file(const char *url, const char *filename, int options)
 944{
 945        int ret;
 946        struct strbuf tmpfile = STRBUF_INIT;
 947        FILE *result;
 948
 949        strbuf_addf(&tmpfile, "%s.temp", filename);
 950        result = fopen(tmpfile.buf, "a");
 951        if (! result) {
 952                error("Unable to open local file %s", tmpfile.buf);
 953                ret = HTTP_ERROR;
 954                goto cleanup;
 955        }
 956
 957        ret = http_request_reauth(url, NULL, result, HTTP_REQUEST_FILE, options);
 958        fclose(result);
 959
 960        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 961                ret = HTTP_ERROR;
 962cleanup:
 963        strbuf_release(&tmpfile);
 964        return ret;
 965}
 966
 967int http_fetch_ref(const char *base, struct ref *ref)
 968{
 969        char *url;
 970        struct strbuf buffer = STRBUF_INIT;
 971        int ret = -1;
 972
 973        url = quote_ref_url(base, ref->name);
 974        if (http_get_strbuf(url, NULL, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 975                strbuf_rtrim(&buffer);
 976                if (buffer.len == 40)
 977                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 978                else if (!prefixcmp(buffer.buf, "ref: ")) {
 979                        ref->symref = xstrdup(buffer.buf + 5);
 980                        ret = 0;
 981                }
 982        }
 983
 984        strbuf_release(&buffer);
 985        free(url);
 986        return ret;
 987}
 988
 989/* Helpers for fetching packs */
 990static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 991{
 992        char *url, *tmp;
 993        struct strbuf buf = STRBUF_INIT;
 994
 995        if (http_is_verbose)
 996                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 997
 998        end_url_with_slash(&buf, base_url);
 999        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1000        url = strbuf_detach(&buf, NULL);
1001
1002        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1003        tmp = strbuf_detach(&buf, NULL);
1004
1005        if (http_get_file(url, tmp, 0) != HTTP_OK) {
1006                error("Unable to get pack index %s", url);
1007                free(tmp);
1008                tmp = NULL;
1009        }
1010
1011        free(url);
1012        return tmp;
1013}
1014
1015static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1016        unsigned char *sha1, const char *base_url)
1017{
1018        struct packed_git *new_pack;
1019        char *tmp_idx = NULL;
1020        int ret;
1021
1022        if (has_pack_index(sha1)) {
1023                new_pack = parse_pack_index(sha1, NULL);
1024                if (!new_pack)
1025                        return -1; /* parse_pack_index() already issued error message */
1026                goto add_pack;
1027        }
1028
1029        tmp_idx = fetch_pack_index(sha1, base_url);
1030        if (!tmp_idx)
1031                return -1;
1032
1033        new_pack = parse_pack_index(sha1, tmp_idx);
1034        if (!new_pack) {
1035                unlink(tmp_idx);
1036                free(tmp_idx);
1037
1038                return -1; /* parse_pack_index() already issued error message */
1039        }
1040
1041        ret = verify_pack_index(new_pack);
1042        if (!ret) {
1043                close_pack_index(new_pack);
1044                ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1045        }
1046        free(tmp_idx);
1047        if (ret)
1048                return -1;
1049
1050add_pack:
1051        new_pack->next = *packs_head;
1052        *packs_head = new_pack;
1053        return 0;
1054}
1055
1056int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1057{
1058        int ret = 0, i = 0;
1059        char *url, *data;
1060        struct strbuf buf = STRBUF_INIT;
1061        unsigned char sha1[20];
1062
1063        end_url_with_slash(&buf, base_url);
1064        strbuf_addstr(&buf, "objects/info/packs");
1065        url = strbuf_detach(&buf, NULL);
1066
1067        ret = http_get_strbuf(url, NULL, &buf, HTTP_NO_CACHE);
1068        if (ret != HTTP_OK)
1069                goto cleanup;
1070
1071        data = buf.buf;
1072        while (i < buf.len) {
1073                switch (data[i]) {
1074                case 'P':
1075                        i++;
1076                        if (i + 52 <= buf.len &&
1077                            !prefixcmp(data + i, " pack-") &&
1078                            !prefixcmp(data + i + 46, ".pack\n")) {
1079                                get_sha1_hex(data + i + 6, sha1);
1080                                fetch_and_setup_pack_index(packs_head, sha1,
1081                                                      base_url);
1082                                i += 51;
1083                                break;
1084                        }
1085                default:
1086                        while (i < buf.len && data[i] != '\n')
1087                                i++;
1088                }
1089                i++;
1090        }
1091
1092cleanup:
1093        free(url);
1094        return ret;
1095}
1096
1097void release_http_pack_request(struct http_pack_request *preq)
1098{
1099        if (preq->packfile != NULL) {
1100                fclose(preq->packfile);
1101                preq->packfile = NULL;
1102        }
1103        if (preq->range_header != NULL) {
1104                curl_slist_free_all(preq->range_header);
1105                preq->range_header = NULL;
1106        }
1107        preq->slot = NULL;
1108        free(preq->url);
1109}
1110
1111int finish_http_pack_request(struct http_pack_request *preq)
1112{
1113        struct packed_git **lst;
1114        struct packed_git *p = preq->target;
1115        char *tmp_idx;
1116        struct child_process ip;
1117        const char *ip_argv[8];
1118
1119        close_pack_index(p);
1120
1121        fclose(preq->packfile);
1122        preq->packfile = NULL;
1123
1124        lst = preq->lst;
1125        while (*lst != p)
1126                lst = &((*lst)->next);
1127        *lst = (*lst)->next;
1128
1129        tmp_idx = xstrdup(preq->tmpfile);
1130        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1131               ".idx.temp");
1132
1133        ip_argv[0] = "index-pack";
1134        ip_argv[1] = "-o";
1135        ip_argv[2] = tmp_idx;
1136        ip_argv[3] = preq->tmpfile;
1137        ip_argv[4] = NULL;
1138
1139        memset(&ip, 0, sizeof(ip));
1140        ip.argv = ip_argv;
1141        ip.git_cmd = 1;
1142        ip.no_stdin = 1;
1143        ip.no_stdout = 1;
1144
1145        if (run_command(&ip)) {
1146                unlink(preq->tmpfile);
1147                unlink(tmp_idx);
1148                free(tmp_idx);
1149                return -1;
1150        }
1151
1152        unlink(sha1_pack_index_name(p->sha1));
1153
1154        if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1155         || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1156                free(tmp_idx);
1157                return -1;
1158        }
1159
1160        install_packed_git(p);
1161        free(tmp_idx);
1162        return 0;
1163}
1164
1165struct http_pack_request *new_http_pack_request(
1166        struct packed_git *target, const char *base_url)
1167{
1168        long prev_posn = 0;
1169        char range[RANGE_HEADER_SIZE];
1170        struct strbuf buf = STRBUF_INIT;
1171        struct http_pack_request *preq;
1172
1173        preq = xcalloc(1, sizeof(*preq));
1174        preq->target = target;
1175
1176        end_url_with_slash(&buf, base_url);
1177        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1178                sha1_to_hex(target->sha1));
1179        preq->url = strbuf_detach(&buf, NULL);
1180
1181        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1182                sha1_pack_name(target->sha1));
1183        preq->packfile = fopen(preq->tmpfile, "a");
1184        if (!preq->packfile) {
1185                error("Unable to open local file %s for pack",
1186                      preq->tmpfile);
1187                goto abort;
1188        }
1189
1190        preq->slot = get_active_slot();
1191        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1192        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1193        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1194        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1195                no_pragma_header);
1196
1197        /*
1198         * If there is data present from a previous transfer attempt,
1199         * resume where it left off
1200         */
1201        prev_posn = ftell(preq->packfile);
1202        if (prev_posn>0) {
1203                if (http_is_verbose)
1204                        fprintf(stderr,
1205                                "Resuming fetch of pack %s at byte %ld\n",
1206                                sha1_to_hex(target->sha1), prev_posn);
1207                sprintf(range, "Range: bytes=%ld-", prev_posn);
1208                preq->range_header = curl_slist_append(NULL, range);
1209                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1210                        preq->range_header);
1211        }
1212
1213        return preq;
1214
1215abort:
1216        free(preq->url);
1217        free(preq);
1218        return NULL;
1219}
1220
1221/* Helpers for fetching objects (loose) */
1222static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1223                               void *data)
1224{
1225        unsigned char expn[4096];
1226        size_t size = eltsize * nmemb;
1227        int posn = 0;
1228        struct http_object_request *freq =
1229                (struct http_object_request *)data;
1230        do {
1231                ssize_t retval = xwrite(freq->localfile,
1232                                        (char *) ptr + posn, size - posn);
1233                if (retval < 0)
1234                        return posn;
1235                posn += retval;
1236        } while (posn < size);
1237
1238        freq->stream.avail_in = size;
1239        freq->stream.next_in = (void *)ptr;
1240        do {
1241                freq->stream.next_out = expn;
1242                freq->stream.avail_out = sizeof(expn);
1243                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1244                git_SHA1_Update(&freq->c, expn,
1245                                sizeof(expn) - freq->stream.avail_out);
1246        } while (freq->stream.avail_in && freq->zret == Z_OK);
1247        return size;
1248}
1249
1250struct http_object_request *new_http_object_request(const char *base_url,
1251        unsigned char *sha1)
1252{
1253        char *hex = sha1_to_hex(sha1);
1254        char *filename;
1255        char prevfile[PATH_MAX];
1256        int prevlocal;
1257        char prev_buf[PREV_BUF_SIZE];
1258        ssize_t prev_read = 0;
1259        long prev_posn = 0;
1260        char range[RANGE_HEADER_SIZE];
1261        struct curl_slist *range_header = NULL;
1262        struct http_object_request *freq;
1263
1264        freq = xcalloc(1, sizeof(*freq));
1265        hashcpy(freq->sha1, sha1);
1266        freq->localfile = -1;
1267
1268        filename = sha1_file_name(sha1);
1269        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1270                 "%s.temp", filename);
1271
1272        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1273        unlink_or_warn(prevfile);
1274        rename(freq->tmpfile, prevfile);
1275        unlink_or_warn(freq->tmpfile);
1276
1277        if (freq->localfile != -1)
1278                error("fd leakage in start: %d", freq->localfile);
1279        freq->localfile = open(freq->tmpfile,
1280                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1281        /*
1282         * This could have failed due to the "lazy directory creation";
1283         * try to mkdir the last path component.
1284         */
1285        if (freq->localfile < 0 && errno == ENOENT) {
1286                char *dir = strrchr(freq->tmpfile, '/');
1287                if (dir) {
1288                        *dir = 0;
1289                        mkdir(freq->tmpfile, 0777);
1290                        *dir = '/';
1291                }
1292                freq->localfile = open(freq->tmpfile,
1293                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1294        }
1295
1296        if (freq->localfile < 0) {
1297                error("Couldn't create temporary file %s: %s",
1298                      freq->tmpfile, strerror(errno));
1299                goto abort;
1300        }
1301
1302        git_inflate_init(&freq->stream);
1303
1304        git_SHA1_Init(&freq->c);
1305
1306        freq->url = get_remote_object_url(base_url, hex, 0);
1307
1308        /*
1309         * If a previous temp file is present, process what was already
1310         * fetched.
1311         */
1312        prevlocal = open(prevfile, O_RDONLY);
1313        if (prevlocal != -1) {
1314                do {
1315                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1316                        if (prev_read>0) {
1317                                if (fwrite_sha1_file(prev_buf,
1318                                                     1,
1319                                                     prev_read,
1320                                                     freq) == prev_read) {
1321                                        prev_posn += prev_read;
1322                                } else {
1323                                        prev_read = -1;
1324                                }
1325                        }
1326                } while (prev_read > 0);
1327                close(prevlocal);
1328        }
1329        unlink_or_warn(prevfile);
1330
1331        /*
1332         * Reset inflate/SHA1 if there was an error reading the previous temp
1333         * file; also rewind to the beginning of the local file.
1334         */
1335        if (prev_read == -1) {
1336                memset(&freq->stream, 0, sizeof(freq->stream));
1337                git_inflate_init(&freq->stream);
1338                git_SHA1_Init(&freq->c);
1339                if (prev_posn>0) {
1340                        prev_posn = 0;
1341                        lseek(freq->localfile, 0, SEEK_SET);
1342                        if (ftruncate(freq->localfile, 0) < 0) {
1343                                error("Couldn't truncate temporary file %s: %s",
1344                                          freq->tmpfile, strerror(errno));
1345                                goto abort;
1346                        }
1347                }
1348        }
1349
1350        freq->slot = get_active_slot();
1351
1352        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1353        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1354        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1355        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1356        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1357
1358        /*
1359         * If we have successfully processed data from a previous fetch
1360         * attempt, only fetch the data we don't already have.
1361         */
1362        if (prev_posn>0) {
1363                if (http_is_verbose)
1364                        fprintf(stderr,
1365                                "Resuming fetch of object %s at byte %ld\n",
1366                                hex, prev_posn);
1367                sprintf(range, "Range: bytes=%ld-", prev_posn);
1368                range_header = curl_slist_append(range_header, range);
1369                curl_easy_setopt(freq->slot->curl,
1370                                 CURLOPT_HTTPHEADER, range_header);
1371        }
1372
1373        return freq;
1374
1375abort:
1376        free(freq->url);
1377        free(freq);
1378        return NULL;
1379}
1380
1381void process_http_object_request(struct http_object_request *freq)
1382{
1383        if (freq->slot == NULL)
1384                return;
1385        freq->curl_result = freq->slot->curl_result;
1386        freq->http_code = freq->slot->http_code;
1387        freq->slot = NULL;
1388}
1389
1390int finish_http_object_request(struct http_object_request *freq)
1391{
1392        struct stat st;
1393
1394        close(freq->localfile);
1395        freq->localfile = -1;
1396
1397        process_http_object_request(freq);
1398
1399        if (freq->http_code == 416) {
1400                warning("requested range invalid; we may already have all the data.");
1401        } else if (freq->curl_result != CURLE_OK) {
1402                if (stat(freq->tmpfile, &st) == 0)
1403                        if (st.st_size == 0)
1404                                unlink_or_warn(freq->tmpfile);
1405                return -1;
1406        }
1407
1408        git_inflate_end(&freq->stream);
1409        git_SHA1_Final(freq->real_sha1, &freq->c);
1410        if (freq->zret != Z_STREAM_END) {
1411                unlink_or_warn(freq->tmpfile);
1412                return -1;
1413        }
1414        if (hashcmp(freq->sha1, freq->real_sha1)) {
1415                unlink_or_warn(freq->tmpfile);
1416                return -1;
1417        }
1418        freq->rename =
1419                move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1420
1421        return freq->rename;
1422}
1423
1424void abort_http_object_request(struct http_object_request *freq)
1425{
1426        unlink_or_warn(freq->tmpfile);
1427
1428        release_http_object_request(freq);
1429}
1430
1431void release_http_object_request(struct http_object_request *freq)
1432{
1433        if (freq->localfile != -1) {
1434                close(freq->localfile);
1435                freq->localfile = -1;
1436        }
1437        if (freq->url != NULL) {
1438                free(freq->url);
1439                freq->url = NULL;
1440        }
1441        if (freq->slot != NULL) {
1442                freq->slot->callback_func = NULL;
1443                freq->slot->callback_data = NULL;
1444                release_active_slot(freq->slot);
1445                freq->slot = NULL;
1446        }
1447}