Andrew's git / gitweb.git / http.c
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http.con commit config: add generic callback wrapper to parse section.<url>.key (836b6fb)
   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 struct 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                ssl_cert_password_required = git_config_bool(var, value);
 164                return 0;
 165        }
 166        if (!strcmp("http.ssltry", var)) {
 167                curl_ssl_try = git_config_bool(var, value);
 168                return 0;
 169        }
 170        if (!strcmp("http.minsessions", var)) {
 171                min_curl_sessions = git_config_int(var, value);
 172#ifndef USE_CURL_MULTI
 173                if (min_curl_sessions > 1)
 174                        min_curl_sessions = 1;
 175#endif
 176                return 0;
 177        }
 178#ifdef USE_CURL_MULTI
 179        if (!strcmp("http.maxrequests", var)) {
 180                max_requests = git_config_int(var, value);
 181                return 0;
 182        }
 183#endif
 184        if (!strcmp("http.lowspeedlimit", var)) {
 185                curl_low_speed_limit = (long)git_config_int(var, value);
 186                return 0;
 187        }
 188        if (!strcmp("http.lowspeedtime", var)) {
 189                curl_low_speed_time = (long)git_config_int(var, value);
 190                return 0;
 191        }
 192
 193        if (!strcmp("http.noepsv", var)) {
 194                curl_ftp_no_epsv = git_config_bool(var, value);
 195                return 0;
 196        }
 197        if (!strcmp("http.proxy", var))
 198                return git_config_string(&curl_http_proxy, var, value);
 199
 200        if (!strcmp("http.cookiefile", var))
 201                return git_config_string(&curl_cookie_file, var, value);
 202
 203        if (!strcmp("http.postbuffer", var)) {
 204                http_post_buffer = git_config_int(var, value);
 205                if (http_post_buffer < LARGE_PACKET_MAX)
 206                        http_post_buffer = LARGE_PACKET_MAX;
 207                return 0;
 208        }
 209
 210        if (!strcmp("http.useragent", var))
 211                return git_config_string(&user_agent, var, value);
 212
 213        /* Fall back on the default ones */
 214        return git_default_config(var, value, cb);
 215}
 216
 217static void init_curl_http_auth(CURL *result)
 218{
 219        if (!http_auth.username)
 220                return;
 221
 222        credential_fill(&http_auth);
 223
 224#if LIBCURL_VERSION_NUM >= 0x071301
 225        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 226        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 227#else
 228        {
 229                static struct strbuf up = STRBUF_INIT;
 230                strbuf_reset(&up);
 231                strbuf_addf(&up, "%s:%s",
 232                            http_auth.username, http_auth.password);
 233                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 234        }
 235#endif
 236}
 237
 238static int has_cert_password(void)
 239{
 240        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 241                return 0;
 242        if (!cert_auth.password) {
 243                cert_auth.protocol = xstrdup("cert");
 244                cert_auth.username = xstrdup("");
 245                cert_auth.path = xstrdup(ssl_cert);
 246                credential_fill(&cert_auth);
 247        }
 248        return 1;
 249}
 250
 251static CURL *get_curl_handle(void)
 252{
 253        CURL *result = curl_easy_init();
 254
 255        if (!curl_ssl_verify) {
 256                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 257                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 258        } else {
 259                /* Verify authenticity of the peer's certificate */
 260                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 261                /* The name in the cert must match whom we tried to connect */
 262                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 263        }
 264
 265#if LIBCURL_VERSION_NUM >= 0x070907
 266        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 267#endif
 268#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 269        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 270#endif
 271
 272        if (http_proactive_auth)
 273                init_curl_http_auth(result);
 274
 275        if (ssl_cert != NULL)
 276                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 277        if (has_cert_password())
 278                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 279#if LIBCURL_VERSION_NUM >= 0x070903
 280        if (ssl_key != NULL)
 281                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 282#endif
 283#if LIBCURL_VERSION_NUM >= 0x070908
 284        if (ssl_capath != NULL)
 285                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 286#endif
 287        if (ssl_cainfo != NULL)
 288                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 289
 290        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 291                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 292                                 curl_low_speed_limit);
 293                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 294                                 curl_low_speed_time);
 295        }
 296
 297        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 298#if LIBCURL_VERSION_NUM >= 0x071301
 299        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 300#elif LIBCURL_VERSION_NUM >= 0x071101
 301        curl_easy_setopt(result, CURLOPT_POST301, 1);
 302#endif
 303
 304        if (getenv("GIT_CURL_VERBOSE"))
 305                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 306
 307        curl_easy_setopt(result, CURLOPT_USERAGENT,
 308                user_agent ? user_agent : git_user_agent());
 309
 310        if (curl_ftp_no_epsv)
 311                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 312
 313#ifdef CURLOPT_USE_SSL
 314        if (curl_ssl_try)
 315                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 316#endif
 317
 318        if (curl_http_proxy) {
 319                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 320                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 321        }
 322
 323        return result;
 324}
 325
 326static void set_from_env(const char **var, const char *envname)
 327{
 328        const char *val = getenv(envname);
 329        if (val)
 330                *var = val;
 331}
 332
 333void http_init(struct remote *remote, const char *url, int proactive_auth)
 334{
 335        char *low_speed_limit;
 336        char *low_speed_time;
 337
 338        http_is_verbose = 0;
 339
 340        git_config(http_options, NULL);
 341
 342        curl_global_init(CURL_GLOBAL_ALL);
 343
 344        http_proactive_auth = proactive_auth;
 345
 346        if (remote && remote->http_proxy)
 347                curl_http_proxy = xstrdup(remote->http_proxy);
 348
 349        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 350        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 351
 352#ifdef USE_CURL_MULTI
 353        {
 354                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 355                if (http_max_requests != NULL)
 356                        max_requests = atoi(http_max_requests);
 357        }
 358
 359        curlm = curl_multi_init();
 360        if (curlm == NULL) {
 361                fprintf(stderr, "Error creating curl multi handle.\n");
 362                exit(1);
 363        }
 364#endif
 365
 366        if (getenv("GIT_SSL_NO_VERIFY"))
 367                curl_ssl_verify = 0;
 368
 369        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 370#if LIBCURL_VERSION_NUM >= 0x070903
 371        set_from_env(&ssl_key, "GIT_SSL_KEY");
 372#endif
 373#if LIBCURL_VERSION_NUM >= 0x070908
 374        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 375#endif
 376        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 377
 378        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 379
 380        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 381        if (low_speed_limit != NULL)
 382                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 383        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 384        if (low_speed_time != NULL)
 385                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 386
 387        if (curl_ssl_verify == -1)
 388                curl_ssl_verify = 1;
 389
 390        curl_session_count = 0;
 391#ifdef USE_CURL_MULTI
 392        if (max_requests < 1)
 393                max_requests = DEFAULT_MAX_REQUESTS;
 394#endif
 395
 396        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 397                curl_ftp_no_epsv = 1;
 398
 399        if (url) {
 400                credential_from_url(&http_auth, url);
 401                if (!ssl_cert_password_required &&
 402                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 403                    !prefixcmp(url, "https://"))
 404                        ssl_cert_password_required = 1;
 405        }
 406
 407#ifndef NO_CURL_EASY_DUPHANDLE
 408        curl_default = get_curl_handle();
 409#endif
 410}
 411
 412void http_cleanup(void)
 413{
 414        struct active_request_slot *slot = active_queue_head;
 415
 416        while (slot != NULL) {
 417                struct active_request_slot *next = slot->next;
 418                if (slot->curl != NULL) {
 419#ifdef USE_CURL_MULTI
 420                        curl_multi_remove_handle(curlm, slot->curl);
 421#endif
 422                        curl_easy_cleanup(slot->curl);
 423                }
 424                free(slot);
 425                slot = next;
 426        }
 427        active_queue_head = NULL;
 428
 429#ifndef NO_CURL_EASY_DUPHANDLE
 430        curl_easy_cleanup(curl_default);
 431#endif
 432
 433#ifdef USE_CURL_MULTI
 434        curl_multi_cleanup(curlm);
 435#endif
 436        curl_global_cleanup();
 437
 438        curl_slist_free_all(pragma_header);
 439        pragma_header = NULL;
 440
 441        curl_slist_free_all(no_pragma_header);
 442        no_pragma_header = NULL;
 443
 444        if (curl_http_proxy) {
 445                free((void *)curl_http_proxy);
 446                curl_http_proxy = NULL;
 447        }
 448
 449        if (cert_auth.password != NULL) {
 450                memset(cert_auth.password, 0, strlen(cert_auth.password));
 451                free(cert_auth.password);
 452                cert_auth.password = NULL;
 453        }
 454        ssl_cert_password_required = 0;
 455}
 456
 457struct active_request_slot *get_active_slot(void)
 458{
 459        struct active_request_slot *slot = active_queue_head;
 460        struct active_request_slot *newslot;
 461
 462#ifdef USE_CURL_MULTI
 463        int num_transfers;
 464
 465        /* Wait for a slot to open up if the queue is full */
 466        while (active_requests >= max_requests) {
 467                curl_multi_perform(curlm, &num_transfers);
 468                if (num_transfers < active_requests)
 469                        process_curl_messages();
 470        }
 471#endif
 472
 473        while (slot != NULL && slot->in_use)
 474                slot = slot->next;
 475
 476        if (slot == NULL) {
 477                newslot = xmalloc(sizeof(*newslot));
 478                newslot->curl = NULL;
 479                newslot->in_use = 0;
 480                newslot->next = NULL;
 481
 482                slot = active_queue_head;
 483                if (slot == NULL) {
 484                        active_queue_head = newslot;
 485                } else {
 486                        while (slot->next != NULL)
 487                                slot = slot->next;
 488                        slot->next = newslot;
 489                }
 490                slot = newslot;
 491        }
 492
 493        if (slot->curl == NULL) {
 494#ifdef NO_CURL_EASY_DUPHANDLE
 495                slot->curl = get_curl_handle();
 496#else
 497                slot->curl = curl_easy_duphandle(curl_default);
 498#endif
 499                curl_session_count++;
 500        }
 501
 502        active_requests++;
 503        slot->in_use = 1;
 504        slot->results = NULL;
 505        slot->finished = NULL;
 506        slot->callback_data = NULL;
 507        slot->callback_func = NULL;
 508        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 509        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 510        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 511        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 512        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 513        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 514        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 515        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 516        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 517        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 518        if (http_auth.password)
 519                init_curl_http_auth(slot->curl);
 520
 521        return slot;
 522}
 523
 524int start_active_slot(struct active_request_slot *slot)
 525{
 526#ifdef USE_CURL_MULTI
 527        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 528        int num_transfers;
 529
 530        if (curlm_result != CURLM_OK &&
 531            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 532                active_requests--;
 533                slot->in_use = 0;
 534                return 0;
 535        }
 536
 537        /*
 538         * We know there must be something to do, since we just added
 539         * something.
 540         */
 541        curl_multi_perform(curlm, &num_transfers);
 542#endif
 543        return 1;
 544}
 545
 546#ifdef USE_CURL_MULTI
 547struct fill_chain {
 548        void *data;
 549        int (*fill)(void *);
 550        struct fill_chain *next;
 551};
 552
 553static struct fill_chain *fill_cfg;
 554
 555void add_fill_function(void *data, int (*fill)(void *))
 556{
 557        struct fill_chain *new = xmalloc(sizeof(*new));
 558        struct fill_chain **linkp = &fill_cfg;
 559        new->data = data;
 560        new->fill = fill;
 561        new->next = NULL;
 562        while (*linkp)
 563                linkp = &(*linkp)->next;
 564        *linkp = new;
 565}
 566
 567void fill_active_slots(void)
 568{
 569        struct active_request_slot *slot = active_queue_head;
 570
 571        while (active_requests < max_requests) {
 572                struct fill_chain *fill;
 573                for (fill = fill_cfg; fill; fill = fill->next)
 574                        if (fill->fill(fill->data))
 575                                break;
 576
 577                if (!fill)
 578                        break;
 579        }
 580
 581        while (slot != NULL) {
 582                if (!slot->in_use && slot->curl != NULL
 583                        && curl_session_count > min_curl_sessions) {
 584                        curl_easy_cleanup(slot->curl);
 585                        slot->curl = NULL;
 586                        curl_session_count--;
 587                }
 588                slot = slot->next;
 589        }
 590}
 591
 592void step_active_slots(void)
 593{
 594        int num_transfers;
 595        CURLMcode curlm_result;
 596
 597        do {
 598                curlm_result = curl_multi_perform(curlm, &num_transfers);
 599        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 600        if (num_transfers < active_requests) {
 601                process_curl_messages();
 602                fill_active_slots();
 603        }
 604}
 605#endif
 606
 607void run_active_slot(struct active_request_slot *slot)
 608{
 609#ifdef USE_CURL_MULTI
 610        fd_set readfds;
 611        fd_set writefds;
 612        fd_set excfds;
 613        int max_fd;
 614        struct timeval select_timeout;
 615        int finished = 0;
 616
 617        slot->finished = &finished;
 618        while (!finished) {
 619                step_active_slots();
 620
 621                if (slot->in_use) {
 622#if LIBCURL_VERSION_NUM >= 0x070f04
 623                        long curl_timeout;
 624                        curl_multi_timeout(curlm, &curl_timeout);
 625                        if (curl_timeout == 0) {
 626                                continue;
 627                        } else if (curl_timeout == -1) {
 628                                select_timeout.tv_sec  = 0;
 629                                select_timeout.tv_usec = 50000;
 630                        } else {
 631                                select_timeout.tv_sec  =  curl_timeout / 1000;
 632                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 633                        }
 634#else
 635                        select_timeout.tv_sec  = 0;
 636                        select_timeout.tv_usec = 50000;
 637#endif
 638
 639                        max_fd = -1;
 640                        FD_ZERO(&readfds);
 641                        FD_ZERO(&writefds);
 642                        FD_ZERO(&excfds);
 643                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 644
 645                        /*
 646                         * It can happen that curl_multi_timeout returns a pathologically
 647                         * long timeout when curl_multi_fdset returns no file descriptors
 648                         * to read.  See commit message for more details.
 649                         */
 650                        if (max_fd < 0 &&
 651                            (select_timeout.tv_sec > 0 ||
 652                             select_timeout.tv_usec > 50000)) {
 653                                select_timeout.tv_sec  = 0;
 654                                select_timeout.tv_usec = 50000;
 655                        }
 656
 657                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 658                }
 659        }
 660#else
 661        while (slot->in_use) {
 662                slot->curl_result = curl_easy_perform(slot->curl);
 663                finish_active_slot(slot);
 664        }
 665#endif
 666}
 667
 668static void closedown_active_slot(struct active_request_slot *slot)
 669{
 670        active_requests--;
 671        slot->in_use = 0;
 672}
 673
 674static void release_active_slot(struct active_request_slot *slot)
 675{
 676        closedown_active_slot(slot);
 677        if (slot->curl && curl_session_count > min_curl_sessions) {
 678#ifdef USE_CURL_MULTI
 679                curl_multi_remove_handle(curlm, slot->curl);
 680#endif
 681                curl_easy_cleanup(slot->curl);
 682                slot->curl = NULL;
 683                curl_session_count--;
 684        }
 685#ifdef USE_CURL_MULTI
 686        fill_active_slots();
 687#endif
 688}
 689
 690void finish_active_slot(struct active_request_slot *slot)
 691{
 692        closedown_active_slot(slot);
 693        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 694
 695        if (slot->finished != NULL)
 696                (*slot->finished) = 1;
 697
 698        /* Store slot results so they can be read after the slot is reused */
 699        if (slot->results != NULL) {
 700                slot->results->curl_result = slot->curl_result;
 701                slot->results->http_code = slot->http_code;
 702        }
 703
 704        /* Run callback if appropriate */
 705        if (slot->callback_func != NULL)
 706                slot->callback_func(slot->callback_data);
 707}
 708
 709void finish_all_active_slots(void)
 710{
 711        struct active_request_slot *slot = active_queue_head;
 712
 713        while (slot != NULL)
 714                if (slot->in_use) {
 715                        run_active_slot(slot);
 716                        slot = active_queue_head;
 717                } else {
 718                        slot = slot->next;
 719                }
 720}
 721
 722/* Helpers for modifying and creating URLs */
 723static inline int needs_quote(int ch)
 724{
 725        if (((ch >= 'A') && (ch <= 'Z'))
 726                        || ((ch >= 'a') && (ch <= 'z'))
 727                        || ((ch >= '0') && (ch <= '9'))
 728                        || (ch == '/')
 729                        || (ch == '-')
 730                        || (ch == '.'))
 731                return 0;
 732        return 1;
 733}
 734
 735static char *quote_ref_url(const char *base, const char *ref)
 736{
 737        struct strbuf buf = STRBUF_INIT;
 738        const char *cp;
 739        int ch;
 740
 741        end_url_with_slash(&buf, base);
 742
 743        for (cp = ref; (ch = *cp) != 0; cp++)
 744                if (needs_quote(ch))
 745                        strbuf_addf(&buf, "%%%02x", ch);
 746                else
 747                        strbuf_addch(&buf, *cp);
 748
 749        return strbuf_detach(&buf, NULL);
 750}
 751
 752void append_remote_object_url(struct strbuf *buf, const char *url,
 753                              const char *hex,
 754                              int only_two_digit_prefix)
 755{
 756        end_url_with_slash(buf, url);
 757
 758        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 759        if (!only_two_digit_prefix)
 760                strbuf_addf(buf, "%s", hex+2);
 761}
 762
 763char *get_remote_object_url(const char *url, const char *hex,
 764                            int only_two_digit_prefix)
 765{
 766        struct strbuf buf = STRBUF_INIT;
 767        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 768        return strbuf_detach(&buf, NULL);
 769}
 770
 771int handle_curl_result(struct slot_results *results)
 772{
 773        /*
 774         * If we see a failing http code with CURLE_OK, we have turned off
 775         * FAILONERROR (to keep the server's custom error response), and should
 776         * translate the code into failure here.
 777         */
 778        if (results->curl_result == CURLE_OK &&
 779            results->http_code >= 400) {
 780                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
 781                /*
 782                 * Normally curl will already have put the "reason phrase"
 783                 * from the server into curl_errorstr; unfortunately without
 784                 * FAILONERROR it is lost, so we can give only the numeric
 785                 * status code.
 786                 */
 787                snprintf(curl_errorstr, sizeof(curl_errorstr),
 788                         "The requested URL returned error: %ld",
 789                         results->http_code);
 790        }
 791
 792        if (results->curl_result == CURLE_OK) {
 793                credential_approve(&http_auth);
 794                return HTTP_OK;
 795        } else if (missing_target(results))
 796                return HTTP_MISSING_TARGET;
 797        else if (results->http_code == 401) {
 798                if (http_auth.username && http_auth.password) {
 799                        credential_reject(&http_auth);
 800                        return HTTP_NOAUTH;
 801                } else {
 802                        credential_fill(&http_auth);
 803                        return HTTP_REAUTH;
 804                }
 805        } else {
 806#if LIBCURL_VERSION_NUM >= 0x070c00
 807                if (!curl_errorstr[0])
 808                        strlcpy(curl_errorstr,
 809                                curl_easy_strerror(results->curl_result),
 810                                sizeof(curl_errorstr));
 811#endif
 812                return HTTP_ERROR;
 813        }
 814}
 815
 816/* http_request() targets */
 817#define HTTP_REQUEST_STRBUF     0
 818#define HTTP_REQUEST_FILE       1
 819
 820static int http_request(const char *url, struct strbuf *type,
 821                        void *result, int target, int options)
 822{
 823        struct active_request_slot *slot;
 824        struct slot_results results;
 825        struct curl_slist *headers = NULL;
 826        struct strbuf buf = STRBUF_INIT;
 827        int ret;
 828
 829        slot = get_active_slot();
 830        slot->results = &results;
 831        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 832
 833        if (result == NULL) {
 834                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 835        } else {
 836                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 837                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 838
 839                if (target == HTTP_REQUEST_FILE) {
 840                        long posn = ftell(result);
 841                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 842                                         fwrite);
 843                        if (posn > 0) {
 844                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 845                                headers = curl_slist_append(headers, buf.buf);
 846                                strbuf_reset(&buf);
 847                        }
 848                } else
 849                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 850                                         fwrite_buffer);
 851        }
 852
 853        strbuf_addstr(&buf, "Pragma:");
 854        if (options & HTTP_NO_CACHE)
 855                strbuf_addstr(&buf, " no-cache");
 856        if (options & HTTP_KEEP_ERROR)
 857                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 858
 859        headers = curl_slist_append(headers, buf.buf);
 860
 861        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 862        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 863        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 864
 865        if (start_active_slot(slot)) {
 866                run_active_slot(slot);
 867                ret = handle_curl_result(&results);
 868        } else {
 869                snprintf(curl_errorstr, sizeof(curl_errorstr),
 870                         "failed to start HTTP request");
 871                ret = HTTP_START_FAILED;
 872        }
 873
 874        if (type) {
 875                char *t;
 876                strbuf_reset(type);
 877                curl_easy_getinfo(slot->curl, CURLINFO_CONTENT_TYPE, &t);
 878                if (t)
 879                        strbuf_addstr(type, t);
 880        }
 881
 882        curl_slist_free_all(headers);
 883        strbuf_release(&buf);
 884
 885        return ret;
 886}
 887
 888static int http_request_reauth(const char *url,
 889                               struct strbuf *type,
 890                               void *result, int target,
 891                               int options)
 892{
 893        int ret = http_request(url, type, result, target, options);
 894        if (ret != HTTP_REAUTH)
 895                return ret;
 896
 897        /*
 898         * If we are using KEEP_ERROR, the previous request may have
 899         * put cruft into our output stream; we should clear it out before
 900         * making our next request. We only know how to do this for
 901         * the strbuf case, but that is enough to satisfy current callers.
 902         */
 903        if (options & HTTP_KEEP_ERROR) {
 904                switch (target) {
 905                case HTTP_REQUEST_STRBUF:
 906                        strbuf_reset(result);
 907                        break;
 908                default:
 909                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
 910                }
 911        }
 912        return http_request(url, type, result, target, options);
 913}
 914
 915int http_get_strbuf(const char *url,
 916                    struct strbuf *type,
 917                    struct strbuf *result, int options)
 918{
 919        return http_request_reauth(url, type, result,
 920                                   HTTP_REQUEST_STRBUF, options);
 921}
 922
 923/*
 924 * Downloads a URL and stores the result in the given file.
 925 *
 926 * If a previous interrupted download is detected (i.e. a previous temporary
 927 * file is still around) the download is resumed.
 928 */
 929static int http_get_file(const char *url, const char *filename, int options)
 930{
 931        int ret;
 932        struct strbuf tmpfile = STRBUF_INIT;
 933        FILE *result;
 934
 935        strbuf_addf(&tmpfile, "%s.temp", filename);
 936        result = fopen(tmpfile.buf, "a");
 937        if (! result) {
 938                error("Unable to open local file %s", tmpfile.buf);
 939                ret = HTTP_ERROR;
 940                goto cleanup;
 941        }
 942
 943        ret = http_request_reauth(url, NULL, result, HTTP_REQUEST_FILE, options);
 944        fclose(result);
 945
 946        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 947                ret = HTTP_ERROR;
 948cleanup:
 949        strbuf_release(&tmpfile);
 950        return ret;
 951}
 952
 953int http_fetch_ref(const char *base, struct ref *ref)
 954{
 955        char *url;
 956        struct strbuf buffer = STRBUF_INIT;
 957        int ret = -1;
 958
 959        url = quote_ref_url(base, ref->name);
 960        if (http_get_strbuf(url, NULL, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 961                strbuf_rtrim(&buffer);
 962                if (buffer.len == 40)
 963                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 964                else if (!prefixcmp(buffer.buf, "ref: ")) {
 965                        ref->symref = xstrdup(buffer.buf + 5);
 966                        ret = 0;
 967                }
 968        }
 969
 970        strbuf_release(&buffer);
 971        free(url);
 972        return ret;
 973}
 974
 975/* Helpers for fetching packs */
 976static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 977{
 978        char *url, *tmp;
 979        struct strbuf buf = STRBUF_INIT;
 980
 981        if (http_is_verbose)
 982                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 983
 984        end_url_with_slash(&buf, base_url);
 985        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 986        url = strbuf_detach(&buf, NULL);
 987
 988        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 989        tmp = strbuf_detach(&buf, NULL);
 990
 991        if (http_get_file(url, tmp, 0) != HTTP_OK) {
 992                error("Unable to get pack index %s", url);
 993                free(tmp);
 994                tmp = NULL;
 995        }
 996
 997        free(url);
 998        return tmp;
 999}
1000
1001static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1002        unsigned char *sha1, const char *base_url)
1003{
1004        struct packed_git *new_pack;
1005        char *tmp_idx = NULL;
1006        int ret;
1007
1008        if (has_pack_index(sha1)) {
1009                new_pack = parse_pack_index(sha1, NULL);
1010                if (!new_pack)
1011                        return -1; /* parse_pack_index() already issued error message */
1012                goto add_pack;
1013        }
1014
1015        tmp_idx = fetch_pack_index(sha1, base_url);
1016        if (!tmp_idx)
1017                return -1;
1018
1019        new_pack = parse_pack_index(sha1, tmp_idx);
1020        if (!new_pack) {
1021                unlink(tmp_idx);
1022                free(tmp_idx);
1023
1024                return -1; /* parse_pack_index() already issued error message */
1025        }
1026
1027        ret = verify_pack_index(new_pack);
1028        if (!ret) {
1029                close_pack_index(new_pack);
1030                ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1031        }
1032        free(tmp_idx);
1033        if (ret)
1034                return -1;
1035
1036add_pack:
1037        new_pack->next = *packs_head;
1038        *packs_head = new_pack;
1039        return 0;
1040}
1041
1042int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1043{
1044        int ret = 0, i = 0;
1045        char *url, *data;
1046        struct strbuf buf = STRBUF_INIT;
1047        unsigned char sha1[20];
1048
1049        end_url_with_slash(&buf, base_url);
1050        strbuf_addstr(&buf, "objects/info/packs");
1051        url = strbuf_detach(&buf, NULL);
1052
1053        ret = http_get_strbuf(url, NULL, &buf, HTTP_NO_CACHE);
1054        if (ret != HTTP_OK)
1055                goto cleanup;
1056
1057        data = buf.buf;
1058        while (i < buf.len) {
1059                switch (data[i]) {
1060                case 'P':
1061                        i++;
1062                        if (i + 52 <= buf.len &&
1063                            !prefixcmp(data + i, " pack-") &&
1064                            !prefixcmp(data + i + 46, ".pack\n")) {
1065                                get_sha1_hex(data + i + 6, sha1);
1066                                fetch_and_setup_pack_index(packs_head, sha1,
1067                                                      base_url);
1068                                i += 51;
1069                                break;
1070                        }
1071                default:
1072                        while (i < buf.len && data[i] != '\n')
1073                                i++;
1074                }
1075                i++;
1076        }
1077
1078cleanup:
1079        free(url);
1080        return ret;
1081}
1082
1083void release_http_pack_request(struct http_pack_request *preq)
1084{
1085        if (preq->packfile != NULL) {
1086                fclose(preq->packfile);
1087                preq->packfile = NULL;
1088        }
1089        if (preq->range_header != NULL) {
1090                curl_slist_free_all(preq->range_header);
1091                preq->range_header = NULL;
1092        }
1093        preq->slot = NULL;
1094        free(preq->url);
1095}
1096
1097int finish_http_pack_request(struct http_pack_request *preq)
1098{
1099        struct packed_git **lst;
1100        struct packed_git *p = preq->target;
1101        char *tmp_idx;
1102        struct child_process ip;
1103        const char *ip_argv[8];
1104
1105        close_pack_index(p);
1106
1107        fclose(preq->packfile);
1108        preq->packfile = NULL;
1109
1110        lst = preq->lst;
1111        while (*lst != p)
1112                lst = &((*lst)->next);
1113        *lst = (*lst)->next;
1114
1115        tmp_idx = xstrdup(preq->tmpfile);
1116        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1117               ".idx.temp");
1118
1119        ip_argv[0] = "index-pack";
1120        ip_argv[1] = "-o";
1121        ip_argv[2] = tmp_idx;
1122        ip_argv[3] = preq->tmpfile;
1123        ip_argv[4] = NULL;
1124
1125        memset(&ip, 0, sizeof(ip));
1126        ip.argv = ip_argv;
1127        ip.git_cmd = 1;
1128        ip.no_stdin = 1;
1129        ip.no_stdout = 1;
1130
1131        if (run_command(&ip)) {
1132                unlink(preq->tmpfile);
1133                unlink(tmp_idx);
1134                free(tmp_idx);
1135                return -1;
1136        }
1137
1138        unlink(sha1_pack_index_name(p->sha1));
1139
1140        if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1141         || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1142                free(tmp_idx);
1143                return -1;
1144        }
1145
1146        install_packed_git(p);
1147        free(tmp_idx);
1148        return 0;
1149}
1150
1151struct http_pack_request *new_http_pack_request(
1152        struct packed_git *target, const char *base_url)
1153{
1154        long prev_posn = 0;
1155        char range[RANGE_HEADER_SIZE];
1156        struct strbuf buf = STRBUF_INIT;
1157        struct http_pack_request *preq;
1158
1159        preq = xcalloc(1, sizeof(*preq));
1160        preq->target = target;
1161
1162        end_url_with_slash(&buf, base_url);
1163        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1164                sha1_to_hex(target->sha1));
1165        preq->url = strbuf_detach(&buf, NULL);
1166
1167        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1168                sha1_pack_name(target->sha1));
1169        preq->packfile = fopen(preq->tmpfile, "a");
1170        if (!preq->packfile) {
1171                error("Unable to open local file %s for pack",
1172                      preq->tmpfile);
1173                goto abort;
1174        }
1175
1176        preq->slot = get_active_slot();
1177        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1178        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1179        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1180        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1181                no_pragma_header);
1182
1183        /*
1184         * If there is data present from a previous transfer attempt,
1185         * resume where it left off
1186         */
1187        prev_posn = ftell(preq->packfile);
1188        if (prev_posn>0) {
1189                if (http_is_verbose)
1190                        fprintf(stderr,
1191                                "Resuming fetch of pack %s at byte %ld\n",
1192                                sha1_to_hex(target->sha1), prev_posn);
1193                sprintf(range, "Range: bytes=%ld-", prev_posn);
1194                preq->range_header = curl_slist_append(NULL, range);
1195                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1196                        preq->range_header);
1197        }
1198
1199        return preq;
1200
1201abort:
1202        free(preq->url);
1203        free(preq);
1204        return NULL;
1205}
1206
1207/* Helpers for fetching objects (loose) */
1208static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1209                               void *data)
1210{
1211        unsigned char expn[4096];
1212        size_t size = eltsize * nmemb;
1213        int posn = 0;
1214        struct http_object_request *freq =
1215                (struct http_object_request *)data;
1216        do {
1217                ssize_t retval = xwrite(freq->localfile,
1218                                        (char *) ptr + posn, size - posn);
1219                if (retval < 0)
1220                        return posn;
1221                posn += retval;
1222        } while (posn < size);
1223
1224        freq->stream.avail_in = size;
1225        freq->stream.next_in = (void *)ptr;
1226        do {
1227                freq->stream.next_out = expn;
1228                freq->stream.avail_out = sizeof(expn);
1229                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1230                git_SHA1_Update(&freq->c, expn,
1231                                sizeof(expn) - freq->stream.avail_out);
1232        } while (freq->stream.avail_in && freq->zret == Z_OK);
1233        return size;
1234}
1235
1236struct http_object_request *new_http_object_request(const char *base_url,
1237        unsigned char *sha1)
1238{
1239        char *hex = sha1_to_hex(sha1);
1240        char *filename;
1241        char prevfile[PATH_MAX];
1242        int prevlocal;
1243        char prev_buf[PREV_BUF_SIZE];
1244        ssize_t prev_read = 0;
1245        long prev_posn = 0;
1246        char range[RANGE_HEADER_SIZE];
1247        struct curl_slist *range_header = NULL;
1248        struct http_object_request *freq;
1249
1250        freq = xcalloc(1, sizeof(*freq));
1251        hashcpy(freq->sha1, sha1);
1252        freq->localfile = -1;
1253
1254        filename = sha1_file_name(sha1);
1255        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1256                 "%s.temp", filename);
1257
1258        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1259        unlink_or_warn(prevfile);
1260        rename(freq->tmpfile, prevfile);
1261        unlink_or_warn(freq->tmpfile);
1262
1263        if (freq->localfile != -1)
1264                error("fd leakage in start: %d", freq->localfile);
1265        freq->localfile = open(freq->tmpfile,
1266                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1267        /*
1268         * This could have failed due to the "lazy directory creation";
1269         * try to mkdir the last path component.
1270         */
1271        if (freq->localfile < 0 && errno == ENOENT) {
1272                char *dir = strrchr(freq->tmpfile, '/');
1273                if (dir) {
1274                        *dir = 0;
1275                        mkdir(freq->tmpfile, 0777);
1276                        *dir = '/';
1277                }
1278                freq->localfile = open(freq->tmpfile,
1279                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1280        }
1281
1282        if (freq->localfile < 0) {
1283                error("Couldn't create temporary file %s: %s",
1284                      freq->tmpfile, strerror(errno));
1285                goto abort;
1286        }
1287
1288        git_inflate_init(&freq->stream);
1289
1290        git_SHA1_Init(&freq->c);
1291
1292        freq->url = get_remote_object_url(base_url, hex, 0);
1293
1294        /*
1295         * If a previous temp file is present, process what was already
1296         * fetched.
1297         */
1298        prevlocal = open(prevfile, O_RDONLY);
1299        if (prevlocal != -1) {
1300                do {
1301                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1302                        if (prev_read>0) {
1303                                if (fwrite_sha1_file(prev_buf,
1304                                                     1,
1305                                                     prev_read,
1306                                                     freq) == prev_read) {
1307                                        prev_posn += prev_read;
1308                                } else {
1309                                        prev_read = -1;
1310                                }
1311                        }
1312                } while (prev_read > 0);
1313                close(prevlocal);
1314        }
1315        unlink_or_warn(prevfile);
1316
1317        /*
1318         * Reset inflate/SHA1 if there was an error reading the previous temp
1319         * file; also rewind to the beginning of the local file.
1320         */
1321        if (prev_read == -1) {
1322                memset(&freq->stream, 0, sizeof(freq->stream));
1323                git_inflate_init(&freq->stream);
1324                git_SHA1_Init(&freq->c);
1325                if (prev_posn>0) {
1326                        prev_posn = 0;
1327                        lseek(freq->localfile, 0, SEEK_SET);
1328                        if (ftruncate(freq->localfile, 0) < 0) {
1329                                error("Couldn't truncate temporary file %s: %s",
1330                                          freq->tmpfile, strerror(errno));
1331                                goto abort;
1332                        }
1333                }
1334        }
1335
1336        freq->slot = get_active_slot();
1337
1338        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1339        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1340        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1341        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1342        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1343
1344        /*
1345         * If we have successfully processed data from a previous fetch
1346         * attempt, only fetch the data we don't already have.
1347         */
1348        if (prev_posn>0) {
1349                if (http_is_verbose)
1350                        fprintf(stderr,
1351                                "Resuming fetch of object %s at byte %ld\n",
1352                                hex, prev_posn);
1353                sprintf(range, "Range: bytes=%ld-", prev_posn);
1354                range_header = curl_slist_append(range_header, range);
1355                curl_easy_setopt(freq->slot->curl,
1356                                 CURLOPT_HTTPHEADER, range_header);
1357        }
1358
1359        return freq;
1360
1361abort:
1362        free(freq->url);
1363        free(freq);
1364        return NULL;
1365}
1366
1367void process_http_object_request(struct http_object_request *freq)
1368{
1369        if (freq->slot == NULL)
1370                return;
1371        freq->curl_result = freq->slot->curl_result;
1372        freq->http_code = freq->slot->http_code;
1373        freq->slot = NULL;
1374}
1375
1376int finish_http_object_request(struct http_object_request *freq)
1377{
1378        struct stat st;
1379
1380        close(freq->localfile);
1381        freq->localfile = -1;
1382
1383        process_http_object_request(freq);
1384
1385        if (freq->http_code == 416) {
1386                warning("requested range invalid; we may already have all the data.");
1387        } else if (freq->curl_result != CURLE_OK) {
1388                if (stat(freq->tmpfile, &st) == 0)
1389                        if (st.st_size == 0)
1390                                unlink_or_warn(freq->tmpfile);
1391                return -1;
1392        }
1393
1394        git_inflate_end(&freq->stream);
1395        git_SHA1_Final(freq->real_sha1, &freq->c);
1396        if (freq->zret != Z_STREAM_END) {
1397                unlink_or_warn(freq->tmpfile);
1398                return -1;
1399        }
1400        if (hashcmp(freq->sha1, freq->real_sha1)) {
1401                unlink_or_warn(freq->tmpfile);
1402                return -1;
1403        }
1404        freq->rename =
1405                move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1406
1407        return freq->rename;
1408}
1409
1410void abort_http_object_request(struct http_object_request *freq)
1411{
1412        unlink_or_warn(freq->tmpfile);
1413
1414        release_http_object_request(freq);
1415}
1416
1417void release_http_object_request(struct http_object_request *freq)
1418{
1419        if (freq->localfile != -1) {
1420                close(freq->localfile);
1421                freq->localfile = -1;
1422        }
1423        if (freq->url != NULL) {
1424                free(freq->url);
1425                freq->url = NULL;
1426        }
1427        if (freq->slot != NULL) {
1428                freq->slot->callback_func = NULL;
1429                freq->slot->callback_data = NULL;
1430                release_active_slot(freq->slot);
1431                freq->slot = NULL;
1432        }
1433}