Andrew's git / gitweb.git / http.c
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http.con commit http: provide effective url to callers (7886896)
   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;
  48struct credential http_auth = CREDENTIAL_INIT;
  49static int http_proactive_auth;
  50static const char *user_agent;
  51
  52#if LIBCURL_VERSION_NUM >= 0x071700
  53/* Use CURLOPT_KEYPASSWD as is */
  54#elif LIBCURL_VERSION_NUM >= 0x070903
  55#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  56#else
  57#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  58#endif
  59
  60static struct credential cert_auth = CREDENTIAL_INIT;
  61static int ssl_cert_password_required;
  62
  63static struct curl_slist *pragma_header;
  64static struct curl_slist *no_pragma_header;
  65
  66static struct active_request_slot *active_queue_head;
  67
  68size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  69{
  70        size_t size = eltsize * nmemb;
  71        struct buffer *buffer = buffer_;
  72
  73        if (size > buffer->buf.len - buffer->posn)
  74                size = buffer->buf.len - buffer->posn;
  75        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  76        buffer->posn += size;
  77
  78        return size;
  79}
  80
  81#ifndef NO_CURL_IOCTL
  82curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  83{
  84        struct buffer *buffer = clientp;
  85
  86        switch (cmd) {
  87        case CURLIOCMD_NOP:
  88                return CURLIOE_OK;
  89
  90        case CURLIOCMD_RESTARTREAD:
  91                buffer->posn = 0;
  92                return CURLIOE_OK;
  93
  94        default:
  95                return CURLIOE_UNKNOWNCMD;
  96        }
  97}
  98#endif
  99
 100size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 101{
 102        size_t size = eltsize * nmemb;
 103        struct strbuf *buffer = buffer_;
 104
 105        strbuf_add(buffer, ptr, size);
 106        return size;
 107}
 108
 109size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 110{
 111        return eltsize * nmemb;
 112}
 113
 114#ifdef USE_CURL_MULTI
 115static void process_curl_messages(void)
 116{
 117        int num_messages;
 118        struct active_request_slot *slot;
 119        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 120
 121        while (curl_message != NULL) {
 122                if (curl_message->msg == CURLMSG_DONE) {
 123                        int curl_result = curl_message->data.result;
 124                        slot = active_queue_head;
 125                        while (slot != NULL &&
 126                               slot->curl != curl_message->easy_handle)
 127                                slot = slot->next;
 128                        if (slot != NULL) {
 129                                curl_multi_remove_handle(curlm, slot->curl);
 130                                slot->curl_result = curl_result;
 131                                finish_active_slot(slot);
 132                        } else {
 133                                fprintf(stderr, "Received DONE message for unknown request!\n");
 134                        }
 135                } else {
 136                        fprintf(stderr, "Unknown CURL message received: %d\n",
 137                                (int)curl_message->msg);
 138                }
 139                curl_message = curl_multi_info_read(curlm, &num_messages);
 140        }
 141}
 142#endif
 143
 144static int http_options(const char *var, const char *value, void *cb)
 145{
 146        if (!strcmp("http.sslverify", var)) {
 147                curl_ssl_verify = git_config_bool(var, value);
 148                return 0;
 149        }
 150        if (!strcmp("http.sslcert", var))
 151                return git_config_string(&ssl_cert, var, value);
 152#if LIBCURL_VERSION_NUM >= 0x070903
 153        if (!strcmp("http.sslkey", var))
 154                return git_config_string(&ssl_key, var, value);
 155#endif
 156#if LIBCURL_VERSION_NUM >= 0x070908
 157        if (!strcmp("http.sslcapath", var))
 158                return git_config_string(&ssl_capath, var, value);
 159#endif
 160        if (!strcmp("http.sslcainfo", var))
 161                return git_config_string(&ssl_cainfo, var, value);
 162        if (!strcmp("http.sslcertpasswordprotected", var)) {
 163                if (git_config_bool(var, value))
 164                        ssl_cert_password_required = 1;
 165                return 0;
 166        }
 167        if (!strcmp("http.ssltry", var)) {
 168                curl_ssl_try = git_config_bool(var, value);
 169                return 0;
 170        }
 171        if (!strcmp("http.minsessions", var)) {
 172                min_curl_sessions = git_config_int(var, value);
 173#ifndef USE_CURL_MULTI
 174                if (min_curl_sessions > 1)
 175                        min_curl_sessions = 1;
 176#endif
 177                return 0;
 178        }
 179#ifdef USE_CURL_MULTI
 180        if (!strcmp("http.maxrequests", var)) {
 181                max_requests = git_config_int(var, value);
 182                return 0;
 183        }
 184#endif
 185        if (!strcmp("http.lowspeedlimit", var)) {
 186                curl_low_speed_limit = (long)git_config_int(var, value);
 187                return 0;
 188        }
 189        if (!strcmp("http.lowspeedtime", var)) {
 190                curl_low_speed_time = (long)git_config_int(var, value);
 191                return 0;
 192        }
 193
 194        if (!strcmp("http.noepsv", var)) {
 195                curl_ftp_no_epsv = git_config_bool(var, value);
 196                return 0;
 197        }
 198        if (!strcmp("http.proxy", var))
 199                return git_config_string(&curl_http_proxy, var, value);
 200
 201        if (!strcmp("http.cookiefile", var))
 202                return git_config_string(&curl_cookie_file, var, value);
 203
 204        if (!strcmp("http.postbuffer", var)) {
 205                http_post_buffer = git_config_int(var, value);
 206                if (http_post_buffer < LARGE_PACKET_MAX)
 207                        http_post_buffer = LARGE_PACKET_MAX;
 208                return 0;
 209        }
 210
 211        if (!strcmp("http.useragent", var))
 212                return git_config_string(&user_agent, var, value);
 213
 214        /* Fall back on the default ones */
 215        return git_default_config(var, value, cb);
 216}
 217
 218static void init_curl_http_auth(CURL *result)
 219{
 220        if (!http_auth.username)
 221                return;
 222
 223        credential_fill(&http_auth);
 224
 225#if LIBCURL_VERSION_NUM >= 0x071301
 226        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 227        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 228#else
 229        {
 230                static struct strbuf up = STRBUF_INIT;
 231                /*
 232                 * Note that we assume we only ever have a single set of
 233                 * credentials in a given program run, so we do not have
 234                 * to worry about updating this buffer, only setting its
 235                 * initial value.
 236                 */
 237                if (!up.len)
 238                        strbuf_addf(&up, "%s:%s",
 239                                http_auth.username, http_auth.password);
 240                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 241        }
 242#endif
 243}
 244
 245static int has_cert_password(void)
 246{
 247        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 248                return 0;
 249        if (!cert_auth.password) {
 250                cert_auth.protocol = xstrdup("cert");
 251                cert_auth.username = xstrdup("");
 252                cert_auth.path = xstrdup(ssl_cert);
 253                credential_fill(&cert_auth);
 254        }
 255        return 1;
 256}
 257
 258static CURL *get_curl_handle(void)
 259{
 260        CURL *result = curl_easy_init();
 261
 262        if (!curl_ssl_verify) {
 263                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 264                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 265        } else {
 266                /* Verify authenticity of the peer's certificate */
 267                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 268                /* The name in the cert must match whom we tried to connect */
 269                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 270        }
 271
 272#if LIBCURL_VERSION_NUM >= 0x070907
 273        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 274#endif
 275#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 276        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 277#endif
 278
 279        if (http_proactive_auth)
 280                init_curl_http_auth(result);
 281
 282        if (ssl_cert != NULL)
 283                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 284        if (has_cert_password())
 285                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 286#if LIBCURL_VERSION_NUM >= 0x070903
 287        if (ssl_key != NULL)
 288                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 289#endif
 290#if LIBCURL_VERSION_NUM >= 0x070908
 291        if (ssl_capath != NULL)
 292                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 293#endif
 294        if (ssl_cainfo != NULL)
 295                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 296
 297        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 298                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 299                                 curl_low_speed_limit);
 300                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 301                                 curl_low_speed_time);
 302        }
 303
 304        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 305#if LIBCURL_VERSION_NUM >= 0x071301
 306        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 307#elif LIBCURL_VERSION_NUM >= 0x071101
 308        curl_easy_setopt(result, CURLOPT_POST301, 1);
 309#endif
 310
 311        if (getenv("GIT_CURL_VERBOSE"))
 312                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 313
 314        curl_easy_setopt(result, CURLOPT_USERAGENT,
 315                user_agent ? user_agent : git_user_agent());
 316
 317        if (curl_ftp_no_epsv)
 318                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 319
 320#ifdef CURLOPT_USE_SSL
 321        if (curl_ssl_try)
 322                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 323#endif
 324
 325        if (curl_http_proxy) {
 326                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 327                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 328        }
 329
 330        return result;
 331}
 332
 333static void set_from_env(const char **var, const char *envname)
 334{
 335        const char *val = getenv(envname);
 336        if (val)
 337                *var = val;
 338}
 339
 340void http_init(struct remote *remote, const char *url, int proactive_auth)
 341{
 342        char *low_speed_limit;
 343        char *low_speed_time;
 344
 345        http_is_verbose = 0;
 346
 347        git_config(http_options, NULL);
 348
 349        curl_global_init(CURL_GLOBAL_ALL);
 350
 351        http_proactive_auth = proactive_auth;
 352
 353        if (remote && remote->http_proxy)
 354                curl_http_proxy = xstrdup(remote->http_proxy);
 355
 356        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 357        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 358
 359#ifdef USE_CURL_MULTI
 360        {
 361                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 362                if (http_max_requests != NULL)
 363                        max_requests = atoi(http_max_requests);
 364        }
 365
 366        curlm = curl_multi_init();
 367        if (curlm == NULL) {
 368                fprintf(stderr, "Error creating curl multi handle.\n");
 369                exit(1);
 370        }
 371#endif
 372
 373        if (getenv("GIT_SSL_NO_VERIFY"))
 374                curl_ssl_verify = 0;
 375
 376        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 377#if LIBCURL_VERSION_NUM >= 0x070903
 378        set_from_env(&ssl_key, "GIT_SSL_KEY");
 379#endif
 380#if LIBCURL_VERSION_NUM >= 0x070908
 381        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 382#endif
 383        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 384
 385        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 386
 387        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 388        if (low_speed_limit != NULL)
 389                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 390        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 391        if (low_speed_time != NULL)
 392                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 393
 394        if (curl_ssl_verify == -1)
 395                curl_ssl_verify = 1;
 396
 397        curl_session_count = 0;
 398#ifdef USE_CURL_MULTI
 399        if (max_requests < 1)
 400                max_requests = DEFAULT_MAX_REQUESTS;
 401#endif
 402
 403        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 404                curl_ftp_no_epsv = 1;
 405
 406        if (url) {
 407                credential_from_url(&http_auth, url);
 408                if (!ssl_cert_password_required &&
 409                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 410                    !prefixcmp(url, "https://"))
 411                        ssl_cert_password_required = 1;
 412        }
 413
 414#ifndef NO_CURL_EASY_DUPHANDLE
 415        curl_default = get_curl_handle();
 416#endif
 417}
 418
 419void http_cleanup(void)
 420{
 421        struct active_request_slot *slot = active_queue_head;
 422
 423        while (slot != NULL) {
 424                struct active_request_slot *next = slot->next;
 425                if (slot->curl != NULL) {
 426#ifdef USE_CURL_MULTI
 427                        curl_multi_remove_handle(curlm, slot->curl);
 428#endif
 429                        curl_easy_cleanup(slot->curl);
 430                }
 431                free(slot);
 432                slot = next;
 433        }
 434        active_queue_head = NULL;
 435
 436#ifndef NO_CURL_EASY_DUPHANDLE
 437        curl_easy_cleanup(curl_default);
 438#endif
 439
 440#ifdef USE_CURL_MULTI
 441        curl_multi_cleanup(curlm);
 442#endif
 443        curl_global_cleanup();
 444
 445        curl_slist_free_all(pragma_header);
 446        pragma_header = NULL;
 447
 448        curl_slist_free_all(no_pragma_header);
 449        no_pragma_header = NULL;
 450
 451        if (curl_http_proxy) {
 452                free((void *)curl_http_proxy);
 453                curl_http_proxy = NULL;
 454        }
 455
 456        if (cert_auth.password != NULL) {
 457                memset(cert_auth.password, 0, strlen(cert_auth.password));
 458                free(cert_auth.password);
 459                cert_auth.password = NULL;
 460        }
 461        ssl_cert_password_required = 0;
 462}
 463
 464struct active_request_slot *get_active_slot(void)
 465{
 466        struct active_request_slot *slot = active_queue_head;
 467        struct active_request_slot *newslot;
 468
 469#ifdef USE_CURL_MULTI
 470        int num_transfers;
 471
 472        /* Wait for a slot to open up if the queue is full */
 473        while (active_requests >= max_requests) {
 474                curl_multi_perform(curlm, &num_transfers);
 475                if (num_transfers < active_requests)
 476                        process_curl_messages();
 477        }
 478#endif
 479
 480        while (slot != NULL && slot->in_use)
 481                slot = slot->next;
 482
 483        if (slot == NULL) {
 484                newslot = xmalloc(sizeof(*newslot));
 485                newslot->curl = NULL;
 486                newslot->in_use = 0;
 487                newslot->next = NULL;
 488
 489                slot = active_queue_head;
 490                if (slot == NULL) {
 491                        active_queue_head = newslot;
 492                } else {
 493                        while (slot->next != NULL)
 494                                slot = slot->next;
 495                        slot->next = newslot;
 496                }
 497                slot = newslot;
 498        }
 499
 500        if (slot->curl == NULL) {
 501#ifdef NO_CURL_EASY_DUPHANDLE
 502                slot->curl = get_curl_handle();
 503#else
 504                slot->curl = curl_easy_duphandle(curl_default);
 505#endif
 506                curl_session_count++;
 507        }
 508
 509        active_requests++;
 510        slot->in_use = 1;
 511        slot->results = NULL;
 512        slot->finished = NULL;
 513        slot->callback_data = NULL;
 514        slot->callback_func = NULL;
 515        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 516        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 517        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 518        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 519        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 520        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 521        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 522        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 523        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 524        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 525        if (http_auth.password)
 526                init_curl_http_auth(slot->curl);
 527
 528        return slot;
 529}
 530
 531int start_active_slot(struct active_request_slot *slot)
 532{
 533#ifdef USE_CURL_MULTI
 534        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 535        int num_transfers;
 536
 537        if (curlm_result != CURLM_OK &&
 538            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 539                active_requests--;
 540                slot->in_use = 0;
 541                return 0;
 542        }
 543
 544        /*
 545         * We know there must be something to do, since we just added
 546         * something.
 547         */
 548        curl_multi_perform(curlm, &num_transfers);
 549#endif
 550        return 1;
 551}
 552
 553#ifdef USE_CURL_MULTI
 554struct fill_chain {
 555        void *data;
 556        int (*fill)(void *);
 557        struct fill_chain *next;
 558};
 559
 560static struct fill_chain *fill_cfg;
 561
 562void add_fill_function(void *data, int (*fill)(void *))
 563{
 564        struct fill_chain *new = xmalloc(sizeof(*new));
 565        struct fill_chain **linkp = &fill_cfg;
 566        new->data = data;
 567        new->fill = fill;
 568        new->next = NULL;
 569        while (*linkp)
 570                linkp = &(*linkp)->next;
 571        *linkp = new;
 572}
 573
 574void fill_active_slots(void)
 575{
 576        struct active_request_slot *slot = active_queue_head;
 577
 578        while (active_requests < max_requests) {
 579                struct fill_chain *fill;
 580                for (fill = fill_cfg; fill; fill = fill->next)
 581                        if (fill->fill(fill->data))
 582                                break;
 583
 584                if (!fill)
 585                        break;
 586        }
 587
 588        while (slot != NULL) {
 589                if (!slot->in_use && slot->curl != NULL
 590                        && curl_session_count > min_curl_sessions) {
 591                        curl_easy_cleanup(slot->curl);
 592                        slot->curl = NULL;
 593                        curl_session_count--;
 594                }
 595                slot = slot->next;
 596        }
 597}
 598
 599void step_active_slots(void)
 600{
 601        int num_transfers;
 602        CURLMcode curlm_result;
 603
 604        do {
 605                curlm_result = curl_multi_perform(curlm, &num_transfers);
 606        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 607        if (num_transfers < active_requests) {
 608                process_curl_messages();
 609                fill_active_slots();
 610        }
 611}
 612#endif
 613
 614void run_active_slot(struct active_request_slot *slot)
 615{
 616#ifdef USE_CURL_MULTI
 617        fd_set readfds;
 618        fd_set writefds;
 619        fd_set excfds;
 620        int max_fd;
 621        struct timeval select_timeout;
 622        int finished = 0;
 623
 624        slot->finished = &finished;
 625        while (!finished) {
 626                step_active_slots();
 627
 628                if (slot->in_use) {
 629#if LIBCURL_VERSION_NUM >= 0x070f04
 630                        long curl_timeout;
 631                        curl_multi_timeout(curlm, &curl_timeout);
 632                        if (curl_timeout == 0) {
 633                                continue;
 634                        } else if (curl_timeout == -1) {
 635                                select_timeout.tv_sec  = 0;
 636                                select_timeout.tv_usec = 50000;
 637                        } else {
 638                                select_timeout.tv_sec  =  curl_timeout / 1000;
 639                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 640                        }
 641#else
 642                        select_timeout.tv_sec  = 0;
 643                        select_timeout.tv_usec = 50000;
 644#endif
 645
 646                        max_fd = -1;
 647                        FD_ZERO(&readfds);
 648                        FD_ZERO(&writefds);
 649                        FD_ZERO(&excfds);
 650                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 651
 652                        /*
 653                         * It can happen that curl_multi_timeout returns a pathologically
 654                         * long timeout when curl_multi_fdset returns no file descriptors
 655                         * to read.  See commit message for more details.
 656                         */
 657                        if (max_fd < 0 &&
 658                            (select_timeout.tv_sec > 0 ||
 659                             select_timeout.tv_usec > 50000)) {
 660                                select_timeout.tv_sec  = 0;
 661                                select_timeout.tv_usec = 50000;
 662                        }
 663
 664                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 665                }
 666        }
 667#else
 668        while (slot->in_use) {
 669                slot->curl_result = curl_easy_perform(slot->curl);
 670                finish_active_slot(slot);
 671        }
 672#endif
 673}
 674
 675static void closedown_active_slot(struct active_request_slot *slot)
 676{
 677        active_requests--;
 678        slot->in_use = 0;
 679}
 680
 681static void release_active_slot(struct active_request_slot *slot)
 682{
 683        closedown_active_slot(slot);
 684        if (slot->curl && curl_session_count > min_curl_sessions) {
 685#ifdef USE_CURL_MULTI
 686                curl_multi_remove_handle(curlm, slot->curl);
 687#endif
 688                curl_easy_cleanup(slot->curl);
 689                slot->curl = NULL;
 690                curl_session_count--;
 691        }
 692#ifdef USE_CURL_MULTI
 693        fill_active_slots();
 694#endif
 695}
 696
 697void finish_active_slot(struct active_request_slot *slot)
 698{
 699        closedown_active_slot(slot);
 700        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 701
 702        if (slot->finished != NULL)
 703                (*slot->finished) = 1;
 704
 705        /* Store slot results so they can be read after the slot is reused */
 706        if (slot->results != NULL) {
 707                slot->results->curl_result = slot->curl_result;
 708                slot->results->http_code = slot->http_code;
 709        }
 710
 711        /* Run callback if appropriate */
 712        if (slot->callback_func != NULL)
 713                slot->callback_func(slot->callback_data);
 714}
 715
 716void finish_all_active_slots(void)
 717{
 718        struct active_request_slot *slot = active_queue_head;
 719
 720        while (slot != NULL)
 721                if (slot->in_use) {
 722                        run_active_slot(slot);
 723                        slot = active_queue_head;
 724                } else {
 725                        slot = slot->next;
 726                }
 727}
 728
 729/* Helpers for modifying and creating URLs */
 730static inline int needs_quote(int ch)
 731{
 732        if (((ch >= 'A') && (ch <= 'Z'))
 733                        || ((ch >= 'a') && (ch <= 'z'))
 734                        || ((ch >= '0') && (ch <= '9'))
 735                        || (ch == '/')
 736                        || (ch == '-')
 737                        || (ch == '.'))
 738                return 0;
 739        return 1;
 740}
 741
 742static char *quote_ref_url(const char *base, const char *ref)
 743{
 744        struct strbuf buf = STRBUF_INIT;
 745        const char *cp;
 746        int ch;
 747
 748        end_url_with_slash(&buf, base);
 749
 750        for (cp = ref; (ch = *cp) != 0; cp++)
 751                if (needs_quote(ch))
 752                        strbuf_addf(&buf, "%%%02x", ch);
 753                else
 754                        strbuf_addch(&buf, *cp);
 755
 756        return strbuf_detach(&buf, NULL);
 757}
 758
 759void append_remote_object_url(struct strbuf *buf, const char *url,
 760                              const char *hex,
 761                              int only_two_digit_prefix)
 762{
 763        end_url_with_slash(buf, url);
 764
 765        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 766        if (!only_two_digit_prefix)
 767                strbuf_addf(buf, "%s", hex+2);
 768}
 769
 770char *get_remote_object_url(const char *url, const char *hex,
 771                            int only_two_digit_prefix)
 772{
 773        struct strbuf buf = STRBUF_INIT;
 774        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 775        return strbuf_detach(&buf, NULL);
 776}
 777
 778int handle_curl_result(struct slot_results *results)
 779{
 780        /*
 781         * If we see a failing http code with CURLE_OK, we have turned off
 782         * FAILONERROR (to keep the server's custom error response), and should
 783         * translate the code into failure here.
 784         */
 785        if (results->curl_result == CURLE_OK &&
 786            results->http_code >= 400) {
 787                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
 788                /*
 789                 * Normally curl will already have put the "reason phrase"
 790                 * from the server into curl_errorstr; unfortunately without
 791                 * FAILONERROR it is lost, so we can give only the numeric
 792                 * status code.
 793                 */
 794                snprintf(curl_errorstr, sizeof(curl_errorstr),
 795                         "The requested URL returned error: %ld",
 796                         results->http_code);
 797        }
 798
 799        if (results->curl_result == CURLE_OK) {
 800                credential_approve(&http_auth);
 801                return HTTP_OK;
 802        } else if (missing_target(results))
 803                return HTTP_MISSING_TARGET;
 804        else if (results->http_code == 401) {
 805                if (http_auth.username && http_auth.password) {
 806                        credential_reject(&http_auth);
 807                        return HTTP_NOAUTH;
 808                } else {
 809                        return HTTP_REAUTH;
 810                }
 811        } else {
 812#if LIBCURL_VERSION_NUM >= 0x070c00
 813                if (!curl_errorstr[0])
 814                        strlcpy(curl_errorstr,
 815                                curl_easy_strerror(results->curl_result),
 816                                sizeof(curl_errorstr));
 817#endif
 818                return HTTP_ERROR;
 819        }
 820}
 821
 822static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
 823{
 824        char *ptr;
 825        CURLcode ret;
 826
 827        strbuf_reset(buf);
 828        ret = curl_easy_getinfo(curl, info, &ptr);
 829        if (!ret && ptr)
 830                strbuf_addstr(buf, ptr);
 831        return ret;
 832}
 833
 834/* http_request() targets */
 835#define HTTP_REQUEST_STRBUF     0
 836#define HTTP_REQUEST_FILE       1
 837
 838static int http_request(const char *url,
 839                        void *result, int target,
 840                        const struct http_get_options *options)
 841{
 842        struct active_request_slot *slot;
 843        struct slot_results results;
 844        struct curl_slist *headers = NULL;
 845        struct strbuf buf = STRBUF_INIT;
 846        int ret;
 847
 848        slot = get_active_slot();
 849        slot->results = &results;
 850        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 851
 852        if (result == NULL) {
 853                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 854        } else {
 855                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 856                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 857
 858                if (target == HTTP_REQUEST_FILE) {
 859                        long posn = ftell(result);
 860                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 861                                         fwrite);
 862                        if (posn > 0) {
 863                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 864                                headers = curl_slist_append(headers, buf.buf);
 865                                strbuf_reset(&buf);
 866                        }
 867                } else
 868                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 869                                         fwrite_buffer);
 870        }
 871
 872        strbuf_addstr(&buf, "Pragma:");
 873        if (options && options->no_cache)
 874                strbuf_addstr(&buf, " no-cache");
 875        if (options && options->keep_error)
 876                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 877
 878        headers = curl_slist_append(headers, buf.buf);
 879
 880        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 881        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 882        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 883
 884        if (start_active_slot(slot)) {
 885                run_active_slot(slot);
 886                ret = handle_curl_result(&results);
 887        } else {
 888                snprintf(curl_errorstr, sizeof(curl_errorstr),
 889                         "failed to start HTTP request");
 890                ret = HTTP_START_FAILED;
 891        }
 892
 893        if (options && options->content_type)
 894                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE,
 895                                options->content_type);
 896
 897        if (options && options->effective_url)
 898                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
 899                                options->effective_url);
 900
 901        curl_slist_free_all(headers);
 902        strbuf_release(&buf);
 903
 904        return ret;
 905}
 906
 907static int http_request_reauth(const char *url,
 908                               void *result, int target,
 909                               struct http_get_options *options)
 910{
 911        int ret = http_request(url, result, target, options);
 912        if (ret != HTTP_REAUTH)
 913                return ret;
 914
 915        /*
 916         * If we are using KEEP_ERROR, the previous request may have
 917         * put cruft into our output stream; we should clear it out before
 918         * making our next request. We only know how to do this for
 919         * the strbuf case, but that is enough to satisfy current callers.
 920         */
 921        if (options && options->keep_error) {
 922                switch (target) {
 923                case HTTP_REQUEST_STRBUF:
 924                        strbuf_reset(result);
 925                        break;
 926                default:
 927                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
 928                }
 929        }
 930
 931        credential_fill(&http_auth);
 932
 933        return http_request(url, result, target, options);
 934}
 935
 936int http_get_strbuf(const char *url,
 937                    struct strbuf *result,
 938                    struct http_get_options *options)
 939{
 940        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
 941}
 942
 943/*
 944 * Downloads a URL and stores the result in the given file.
 945 *
 946 * If a previous interrupted download is detected (i.e. a previous temporary
 947 * file is still around) the download is resumed.
 948 */
 949static int http_get_file(const char *url, const char *filename,
 950                         struct http_get_options *options)
 951{
 952        int ret;
 953        struct strbuf tmpfile = STRBUF_INIT;
 954        FILE *result;
 955
 956        strbuf_addf(&tmpfile, "%s.temp", filename);
 957        result = fopen(tmpfile.buf, "a");
 958        if (!result) {
 959                error("Unable to open local file %s", tmpfile.buf);
 960                ret = HTTP_ERROR;
 961                goto cleanup;
 962        }
 963
 964        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
 965        fclose(result);
 966
 967        if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
 968                ret = HTTP_ERROR;
 969cleanup:
 970        strbuf_release(&tmpfile);
 971        return ret;
 972}
 973
 974int http_fetch_ref(const char *base, struct ref *ref)
 975{
 976        struct http_get_options options = {0};
 977        char *url;
 978        struct strbuf buffer = STRBUF_INIT;
 979        int ret = -1;
 980
 981        options.no_cache = 1;
 982
 983        url = quote_ref_url(base, ref->name);
 984        if (http_get_strbuf(url, &buffer, &options) == 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        struct http_get_options options = {0};
1069        int ret = 0, i = 0;
1070        char *url, *data;
1071        struct strbuf buf = STRBUF_INIT;
1072        unsigned char sha1[20];
1073
1074        end_url_with_slash(&buf, base_url);
1075        strbuf_addstr(&buf, "objects/info/packs");
1076        url = strbuf_detach(&buf, NULL);
1077
1078        options.no_cache = 1;
1079        ret = http_get_strbuf(url, &buf, &options);
1080        if (ret != HTTP_OK)
1081                goto cleanup;
1082
1083        data = buf.buf;
1084        while (i < buf.len) {
1085                switch (data[i]) {
1086                case 'P':
1087                        i++;
1088                        if (i + 52 <= buf.len &&
1089                            !prefixcmp(data + i, " pack-") &&
1090                            !prefixcmp(data + i + 46, ".pack\n")) {
1091                                get_sha1_hex(data + i + 6, sha1);
1092                                fetch_and_setup_pack_index(packs_head, sha1,
1093                                                      base_url);
1094                                i += 51;
1095                                break;
1096                        }
1097                default:
1098                        while (i < buf.len && data[i] != '\n')
1099                                i++;
1100                }
1101                i++;
1102        }
1103
1104cleanup:
1105        free(url);
1106        return ret;
1107}
1108
1109void release_http_pack_request(struct http_pack_request *preq)
1110{
1111        if (preq->packfile != NULL) {
1112                fclose(preq->packfile);
1113                preq->packfile = NULL;
1114        }
1115        if (preq->range_header != NULL) {
1116                curl_slist_free_all(preq->range_header);
1117                preq->range_header = NULL;
1118        }
1119        preq->slot = NULL;
1120        free(preq->url);
1121}
1122
1123int finish_http_pack_request(struct http_pack_request *preq)
1124{
1125        struct packed_git **lst;
1126        struct packed_git *p = preq->target;
1127        char *tmp_idx;
1128        struct child_process ip;
1129        const char *ip_argv[8];
1130
1131        close_pack_index(p);
1132
1133        fclose(preq->packfile);
1134        preq->packfile = NULL;
1135
1136        lst = preq->lst;
1137        while (*lst != p)
1138                lst = &((*lst)->next);
1139        *lst = (*lst)->next;
1140
1141        tmp_idx = xstrdup(preq->tmpfile);
1142        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1143               ".idx.temp");
1144
1145        ip_argv[0] = "index-pack";
1146        ip_argv[1] = "-o";
1147        ip_argv[2] = tmp_idx;
1148        ip_argv[3] = preq->tmpfile;
1149        ip_argv[4] = NULL;
1150
1151        memset(&ip, 0, sizeof(ip));
1152        ip.argv = ip_argv;
1153        ip.git_cmd = 1;
1154        ip.no_stdin = 1;
1155        ip.no_stdout = 1;
1156
1157        if (run_command(&ip)) {
1158                unlink(preq->tmpfile);
1159                unlink(tmp_idx);
1160                free(tmp_idx);
1161                return -1;
1162        }
1163
1164        unlink(sha1_pack_index_name(p->sha1));
1165
1166        if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1167         || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1168                free(tmp_idx);
1169                return -1;
1170        }
1171
1172        install_packed_git(p);
1173        free(tmp_idx);
1174        return 0;
1175}
1176
1177struct http_pack_request *new_http_pack_request(
1178        struct packed_git *target, const char *base_url)
1179{
1180        long prev_posn = 0;
1181        char range[RANGE_HEADER_SIZE];
1182        struct strbuf buf = STRBUF_INIT;
1183        struct http_pack_request *preq;
1184
1185        preq = xcalloc(1, sizeof(*preq));
1186        preq->target = target;
1187
1188        end_url_with_slash(&buf, base_url);
1189        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1190                sha1_to_hex(target->sha1));
1191        preq->url = strbuf_detach(&buf, NULL);
1192
1193        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1194                sha1_pack_name(target->sha1));
1195        preq->packfile = fopen(preq->tmpfile, "a");
1196        if (!preq->packfile) {
1197                error("Unable to open local file %s for pack",
1198                      preq->tmpfile);
1199                goto abort;
1200        }
1201
1202        preq->slot = get_active_slot();
1203        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1204        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1205        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1206        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1207                no_pragma_header);
1208
1209        /*
1210         * If there is data present from a previous transfer attempt,
1211         * resume where it left off
1212         */
1213        prev_posn = ftell(preq->packfile);
1214        if (prev_posn>0) {
1215                if (http_is_verbose)
1216                        fprintf(stderr,
1217                                "Resuming fetch of pack %s at byte %ld\n",
1218                                sha1_to_hex(target->sha1), prev_posn);
1219                sprintf(range, "Range: bytes=%ld-", prev_posn);
1220                preq->range_header = curl_slist_append(NULL, range);
1221                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1222                        preq->range_header);
1223        }
1224
1225        return preq;
1226
1227abort:
1228        free(preq->url);
1229        free(preq);
1230        return NULL;
1231}
1232
1233/* Helpers for fetching objects (loose) */
1234static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1235                               void *data)
1236{
1237        unsigned char expn[4096];
1238        size_t size = eltsize * nmemb;
1239        int posn = 0;
1240        struct http_object_request *freq =
1241                (struct http_object_request *)data;
1242        do {
1243                ssize_t retval = xwrite(freq->localfile,
1244                                        (char *) ptr + posn, size - posn);
1245                if (retval < 0)
1246                        return posn;
1247                posn += retval;
1248        } while (posn < size);
1249
1250        freq->stream.avail_in = size;
1251        freq->stream.next_in = (void *)ptr;
1252        do {
1253                freq->stream.next_out = expn;
1254                freq->stream.avail_out = sizeof(expn);
1255                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1256                git_SHA1_Update(&freq->c, expn,
1257                                sizeof(expn) - freq->stream.avail_out);
1258        } while (freq->stream.avail_in && freq->zret == Z_OK);
1259        return size;
1260}
1261
1262struct http_object_request *new_http_object_request(const char *base_url,
1263        unsigned char *sha1)
1264{
1265        char *hex = sha1_to_hex(sha1);
1266        char *filename;
1267        char prevfile[PATH_MAX];
1268        int prevlocal;
1269        char prev_buf[PREV_BUF_SIZE];
1270        ssize_t prev_read = 0;
1271        long prev_posn = 0;
1272        char range[RANGE_HEADER_SIZE];
1273        struct curl_slist *range_header = NULL;
1274        struct http_object_request *freq;
1275
1276        freq = xcalloc(1, sizeof(*freq));
1277        hashcpy(freq->sha1, sha1);
1278        freq->localfile = -1;
1279
1280        filename = sha1_file_name(sha1);
1281        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1282                 "%s.temp", filename);
1283
1284        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1285        unlink_or_warn(prevfile);
1286        rename(freq->tmpfile, prevfile);
1287        unlink_or_warn(freq->tmpfile);
1288
1289        if (freq->localfile != -1)
1290                error("fd leakage in start: %d", freq->localfile);
1291        freq->localfile = open(freq->tmpfile,
1292                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1293        /*
1294         * This could have failed due to the "lazy directory creation";
1295         * try to mkdir the last path component.
1296         */
1297        if (freq->localfile < 0 && errno == ENOENT) {
1298                char *dir = strrchr(freq->tmpfile, '/');
1299                if (dir) {
1300                        *dir = 0;
1301                        mkdir(freq->tmpfile, 0777);
1302                        *dir = '/';
1303                }
1304                freq->localfile = open(freq->tmpfile,
1305                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1306        }
1307
1308        if (freq->localfile < 0) {
1309                error("Couldn't create temporary file %s: %s",
1310                      freq->tmpfile, strerror(errno));
1311                goto abort;
1312        }
1313
1314        git_inflate_init(&freq->stream);
1315
1316        git_SHA1_Init(&freq->c);
1317
1318        freq->url = get_remote_object_url(base_url, hex, 0);
1319
1320        /*
1321         * If a previous temp file is present, process what was already
1322         * fetched.
1323         */
1324        prevlocal = open(prevfile, O_RDONLY);
1325        if (prevlocal != -1) {
1326                do {
1327                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1328                        if (prev_read>0) {
1329                                if (fwrite_sha1_file(prev_buf,
1330                                                     1,
1331                                                     prev_read,
1332                                                     freq) == prev_read) {
1333                                        prev_posn += prev_read;
1334                                } else {
1335                                        prev_read = -1;
1336                                }
1337                        }
1338                } while (prev_read > 0);
1339                close(prevlocal);
1340        }
1341        unlink_or_warn(prevfile);
1342
1343        /*
1344         * Reset inflate/SHA1 if there was an error reading the previous temp
1345         * file; also rewind to the beginning of the local file.
1346         */
1347        if (prev_read == -1) {
1348                memset(&freq->stream, 0, sizeof(freq->stream));
1349                git_inflate_init(&freq->stream);
1350                git_SHA1_Init(&freq->c);
1351                if (prev_posn>0) {
1352                        prev_posn = 0;
1353                        lseek(freq->localfile, 0, SEEK_SET);
1354                        if (ftruncate(freq->localfile, 0) < 0) {
1355                                error("Couldn't truncate temporary file %s: %s",
1356                                          freq->tmpfile, strerror(errno));
1357                                goto abort;
1358                        }
1359                }
1360        }
1361
1362        freq->slot = get_active_slot();
1363
1364        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1365        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1366        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1367        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1368        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1369
1370        /*
1371         * If we have successfully processed data from a previous fetch
1372         * attempt, only fetch the data we don't already have.
1373         */
1374        if (prev_posn>0) {
1375                if (http_is_verbose)
1376                        fprintf(stderr,
1377                                "Resuming fetch of object %s at byte %ld\n",
1378                                hex, prev_posn);
1379                sprintf(range, "Range: bytes=%ld-", prev_posn);
1380                range_header = curl_slist_append(range_header, range);
1381                curl_easy_setopt(freq->slot->curl,
1382                                 CURLOPT_HTTPHEADER, range_header);
1383        }
1384
1385        return freq;
1386
1387abort:
1388        free(freq->url);
1389        free(freq);
1390        return NULL;
1391}
1392
1393void process_http_object_request(struct http_object_request *freq)
1394{
1395        if (freq->slot == NULL)
1396                return;
1397        freq->curl_result = freq->slot->curl_result;
1398        freq->http_code = freq->slot->http_code;
1399        freq->slot = NULL;
1400}
1401
1402int finish_http_object_request(struct http_object_request *freq)
1403{
1404        struct stat st;
1405
1406        close(freq->localfile);
1407        freq->localfile = -1;
1408
1409        process_http_object_request(freq);
1410
1411        if (freq->http_code == 416) {
1412                warning("requested range invalid; we may already have all the data.");
1413        } else if (freq->curl_result != CURLE_OK) {
1414                if (stat(freq->tmpfile, &st) == 0)
1415                        if (st.st_size == 0)
1416                                unlink_or_warn(freq->tmpfile);
1417                return -1;
1418        }
1419
1420        git_inflate_end(&freq->stream);
1421        git_SHA1_Final(freq->real_sha1, &freq->c);
1422        if (freq->zret != Z_STREAM_END) {
1423                unlink_or_warn(freq->tmpfile);
1424                return -1;
1425        }
1426        if (hashcmp(freq->sha1, freq->real_sha1)) {
1427                unlink_or_warn(freq->tmpfile);
1428                return -1;
1429        }
1430        freq->rename =
1431                move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1432
1433        return freq->rename;
1434}
1435
1436void abort_http_object_request(struct http_object_request *freq)
1437{
1438        unlink_or_warn(freq->tmpfile);
1439
1440        release_http_object_request(freq);
1441}
1442
1443void release_http_object_request(struct http_object_request *freq)
1444{
1445        if (freq->localfile != -1) {
1446                close(freq->localfile);
1447                freq->localfile = -1;
1448        }
1449        if (freq->url != NULL) {
1450                free(freq->url);
1451                freq->url = NULL;
1452        }
1453        if (freq->slot != NULL) {
1454                freq->slot->callback_func = NULL;
1455                freq->slot->callback_data = NULL;
1456                release_active_slot(freq->slot);
1457                freq->slot = NULL;
1458        }
1459}