Andrew's git / gitweb.git / http.c
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http.con commit urlmatch.c: recompute pointer after append_normalized_escapes (a7f0a0e)
   1#include "http.h"
   2#include "pack.h"
   3#include "sideband.h"
   4#include "run-command.h"
   5#include "url.h"
   6#include "urlmatch.h"
   7#include "credential.h"
   8#include "version.h"
   9#include "pkt-line.h"
  10
  11int active_requests;
  12int http_is_verbose;
  13size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  14
  15#if LIBCURL_VERSION_NUM >= 0x070a06
  16#define LIBCURL_CAN_HANDLE_AUTH_ANY
  17#endif
  18
  19static int min_curl_sessions = 1;
  20static int curl_session_count;
  21#ifdef USE_CURL_MULTI
  22static int max_requests = -1;
  23static CURLM *curlm;
  24#endif
  25#ifndef NO_CURL_EASY_DUPHANDLE
  26static CURL *curl_default;
  27#endif
  28
  29#define PREV_BUF_SIZE 4096
  30#define RANGE_HEADER_SIZE 30
  31
  32char curl_errorstr[CURL_ERROR_SIZE];
  33
  34static int curl_ssl_verify = -1;
  35static int curl_ssl_try;
  36static const char *ssl_cert;
  37#if LIBCURL_VERSION_NUM >= 0x070903
  38static const char *ssl_key;
  39#endif
  40#if LIBCURL_VERSION_NUM >= 0x070908
  41static const char *ssl_capath;
  42#endif
  43static const char *ssl_cainfo;
  44static long curl_low_speed_limit = -1;
  45static long curl_low_speed_time = -1;
  46static int curl_ftp_no_epsv;
  47static const char *curl_http_proxy;
  48static const char *curl_cookie_file;
  49static struct credential http_auth = CREDENTIAL_INIT;
  50static int http_proactive_auth;
  51static const char *user_agent;
  52
  53#if LIBCURL_VERSION_NUM >= 0x071700
  54/* Use CURLOPT_KEYPASSWD as is */
  55#elif LIBCURL_VERSION_NUM >= 0x070903
  56#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  57#else
  58#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  59#endif
  60
  61static struct credential cert_auth = CREDENTIAL_INIT;
  62static int ssl_cert_password_required;
  63
  64static struct curl_slist *pragma_header;
  65static struct curl_slist *no_pragma_header;
  66
  67static struct active_request_slot *active_queue_head;
  68
  69size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  70{
  71        size_t size = eltsize * nmemb;
  72        struct buffer *buffer = buffer_;
  73
  74        if (size > buffer->buf.len - buffer->posn)
  75                size = buffer->buf.len - buffer->posn;
  76        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  77        buffer->posn += size;
  78
  79        return size;
  80}
  81
  82#ifndef NO_CURL_IOCTL
  83curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  84{
  85        struct buffer *buffer = clientp;
  86
  87        switch (cmd) {
  88        case CURLIOCMD_NOP:
  89                return CURLIOE_OK;
  90
  91        case CURLIOCMD_RESTARTREAD:
  92                buffer->posn = 0;
  93                return CURLIOE_OK;
  94
  95        default:
  96                return CURLIOE_UNKNOWNCMD;
  97        }
  98}
  99#endif
 100
 101size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 102{
 103        size_t size = eltsize * nmemb;
 104        struct strbuf *buffer = buffer_;
 105
 106        strbuf_add(buffer, ptr, size);
 107        return size;
 108}
 109
 110size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 111{
 112        return eltsize * nmemb;
 113}
 114
 115#ifdef USE_CURL_MULTI
 116static void process_curl_messages(void)
 117{
 118        int num_messages;
 119        struct active_request_slot *slot;
 120        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 121
 122        while (curl_message != NULL) {
 123                if (curl_message->msg == CURLMSG_DONE) {
 124                        int curl_result = curl_message->data.result;
 125                        slot = active_queue_head;
 126                        while (slot != NULL &&
 127                               slot->curl != curl_message->easy_handle)
 128                                slot = slot->next;
 129                        if (slot != NULL) {
 130                                curl_multi_remove_handle(curlm, slot->curl);
 131                                slot->curl_result = curl_result;
 132                                finish_active_slot(slot);
 133                        } else {
 134                                fprintf(stderr, "Received DONE message for unknown request!\n");
 135                        }
 136                } else {
 137                        fprintf(stderr, "Unknown CURL message received: %d\n",
 138                                (int)curl_message->msg);
 139                }
 140                curl_message = curl_multi_info_read(curlm, &num_messages);
 141        }
 142}
 143#endif
 144
 145static int http_options(const char *var, const char *value, void *cb)
 146{
 147        if (!strcmp("http.sslverify", var)) {
 148                curl_ssl_verify = git_config_bool(var, value);
 149                return 0;
 150        }
 151        if (!strcmp("http.sslcert", var))
 152                return git_config_string(&ssl_cert, var, value);
 153#if LIBCURL_VERSION_NUM >= 0x070903
 154        if (!strcmp("http.sslkey", var))
 155                return git_config_string(&ssl_key, var, value);
 156#endif
 157#if LIBCURL_VERSION_NUM >= 0x070908
 158        if (!strcmp("http.sslcapath", var))
 159                return git_config_string(&ssl_capath, var, value);
 160#endif
 161        if (!strcmp("http.sslcainfo", var))
 162                return git_config_string(&ssl_cainfo, var, value);
 163        if (!strcmp("http.sslcertpasswordprotected", var)) {
 164                ssl_cert_password_required = git_config_bool(var, value);
 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                strbuf_reset(&up);
 232                strbuf_addf(&up, "%s:%s",
 233                            http_auth.username, http_auth.password);
 234                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 235        }
 236#endif
 237}
 238
 239static int has_cert_password(void)
 240{
 241        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 242                return 0;
 243        if (!cert_auth.password) {
 244                cert_auth.protocol = xstrdup("cert");
 245                cert_auth.username = xstrdup("");
 246                cert_auth.path = xstrdup(ssl_cert);
 247                credential_fill(&cert_auth);
 248        }
 249        return 1;
 250}
 251
 252static CURL *get_curl_handle(void)
 253{
 254        CURL *result = curl_easy_init();
 255
 256        if (!curl_ssl_verify) {
 257                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 258                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 259        } else {
 260                /* Verify authenticity of the peer's certificate */
 261                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 262                /* The name in the cert must match whom we tried to connect */
 263                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 264        }
 265
 266#if LIBCURL_VERSION_NUM >= 0x070907
 267        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 268#endif
 269#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 270        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 271#endif
 272
 273        if (http_proactive_auth)
 274                init_curl_http_auth(result);
 275
 276        if (ssl_cert != NULL)
 277                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 278        if (has_cert_password())
 279                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 280#if LIBCURL_VERSION_NUM >= 0x070903
 281        if (ssl_key != NULL)
 282                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 283#endif
 284#if LIBCURL_VERSION_NUM >= 0x070908
 285        if (ssl_capath != NULL)
 286                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 287#endif
 288        if (ssl_cainfo != NULL)
 289                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 290
 291        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 292                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 293                                 curl_low_speed_limit);
 294                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 295                                 curl_low_speed_time);
 296        }
 297
 298        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 299#if LIBCURL_VERSION_NUM >= 0x071301
 300        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 301#elif LIBCURL_VERSION_NUM >= 0x071101
 302        curl_easy_setopt(result, CURLOPT_POST301, 1);
 303#endif
 304
 305        if (getenv("GIT_CURL_VERBOSE"))
 306                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 307
 308        curl_easy_setopt(result, CURLOPT_USERAGENT,
 309                user_agent ? user_agent : git_user_agent());
 310
 311        if (curl_ftp_no_epsv)
 312                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 313
 314#ifdef CURLOPT_USE_SSL
 315        if (curl_ssl_try)
 316                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 317#endif
 318
 319        if (curl_http_proxy) {
 320                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 321                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 322        }
 323
 324        return result;
 325}
 326
 327static void set_from_env(const char **var, const char *envname)
 328{
 329        const char *val = getenv(envname);
 330        if (val)
 331                *var = val;
 332}
 333
 334void http_init(struct remote *remote, const char *url, int proactive_auth)
 335{
 336        char *low_speed_limit;
 337        char *low_speed_time;
 338        char *normalized_url;
 339        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 340
 341        config.section = "http";
 342        config.key = NULL;
 343        config.collect_fn = http_options;
 344        config.cascade_fn = git_default_config;
 345        config.cb = NULL;
 346
 347        http_is_verbose = 0;
 348        normalized_url = url_normalize(url, &config.url);
 349
 350        git_config(urlmatch_config_entry, &config);
 351        free(normalized_url);
 352
 353        curl_global_init(CURL_GLOBAL_ALL);
 354
 355        http_proactive_auth = proactive_auth;
 356
 357        if (remote && remote->http_proxy)
 358                curl_http_proxy = xstrdup(remote->http_proxy);
 359
 360        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 361        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 362
 363#ifdef USE_CURL_MULTI
 364        {
 365                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 366                if (http_max_requests != NULL)
 367                        max_requests = atoi(http_max_requests);
 368        }
 369
 370        curlm = curl_multi_init();
 371        if (curlm == NULL) {
 372                fprintf(stderr, "Error creating curl multi handle.\n");
 373                exit(1);
 374        }
 375#endif
 376
 377        if (getenv("GIT_SSL_NO_VERIFY"))
 378                curl_ssl_verify = 0;
 379
 380        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 381#if LIBCURL_VERSION_NUM >= 0x070903
 382        set_from_env(&ssl_key, "GIT_SSL_KEY");
 383#endif
 384#if LIBCURL_VERSION_NUM >= 0x070908
 385        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 386#endif
 387        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 388
 389        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 390
 391        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 392        if (low_speed_limit != NULL)
 393                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 394        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 395        if (low_speed_time != NULL)
 396                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 397
 398        if (curl_ssl_verify == -1)
 399                curl_ssl_verify = 1;
 400
 401        curl_session_count = 0;
 402#ifdef USE_CURL_MULTI
 403        if (max_requests < 1)
 404                max_requests = DEFAULT_MAX_REQUESTS;
 405#endif
 406
 407        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 408                curl_ftp_no_epsv = 1;
 409
 410        if (url) {
 411                credential_from_url(&http_auth, url);
 412                if (!ssl_cert_password_required &&
 413                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 414                    !prefixcmp(url, "https://"))
 415                        ssl_cert_password_required = 1;
 416        }
 417
 418#ifndef NO_CURL_EASY_DUPHANDLE
 419        curl_default = get_curl_handle();
 420#endif
 421}
 422
 423void http_cleanup(void)
 424{
 425        struct active_request_slot *slot = active_queue_head;
 426
 427        while (slot != NULL) {
 428                struct active_request_slot *next = slot->next;
 429                if (slot->curl != NULL) {
 430#ifdef USE_CURL_MULTI
 431                        curl_multi_remove_handle(curlm, slot->curl);
 432#endif
 433                        curl_easy_cleanup(slot->curl);
 434                }
 435                free(slot);
 436                slot = next;
 437        }
 438        active_queue_head = NULL;
 439
 440#ifndef NO_CURL_EASY_DUPHANDLE
 441        curl_easy_cleanup(curl_default);
 442#endif
 443
 444#ifdef USE_CURL_MULTI
 445        curl_multi_cleanup(curlm);
 446#endif
 447        curl_global_cleanup();
 448
 449        curl_slist_free_all(pragma_header);
 450        pragma_header = NULL;
 451
 452        curl_slist_free_all(no_pragma_header);
 453        no_pragma_header = NULL;
 454
 455        if (curl_http_proxy) {
 456                free((void *)curl_http_proxy);
 457                curl_http_proxy = NULL;
 458        }
 459
 460        if (cert_auth.password != NULL) {
 461                memset(cert_auth.password, 0, strlen(cert_auth.password));
 462                free(cert_auth.password);
 463                cert_auth.password = NULL;
 464        }
 465        ssl_cert_password_required = 0;
 466}
 467
 468struct active_request_slot *get_active_slot(void)
 469{
 470        struct active_request_slot *slot = active_queue_head;
 471        struct active_request_slot *newslot;
 472
 473#ifdef USE_CURL_MULTI
 474        int num_transfers;
 475
 476        /* Wait for a slot to open up if the queue is full */
 477        while (active_requests >= max_requests) {
 478                curl_multi_perform(curlm, &num_transfers);
 479                if (num_transfers < active_requests)
 480                        process_curl_messages();
 481        }
 482#endif
 483
 484        while (slot != NULL && slot->in_use)
 485                slot = slot->next;
 486
 487        if (slot == NULL) {
 488                newslot = xmalloc(sizeof(*newslot));
 489                newslot->curl = NULL;
 490                newslot->in_use = 0;
 491                newslot->next = NULL;
 492
 493                slot = active_queue_head;
 494                if (slot == NULL) {
 495                        active_queue_head = newslot;
 496                } else {
 497                        while (slot->next != NULL)
 498                                slot = slot->next;
 499                        slot->next = newslot;
 500                }
 501                slot = newslot;
 502        }
 503
 504        if (slot->curl == NULL) {
 505#ifdef NO_CURL_EASY_DUPHANDLE
 506                slot->curl = get_curl_handle();
 507#else
 508                slot->curl = curl_easy_duphandle(curl_default);
 509#endif
 510                curl_session_count++;
 511        }
 512
 513        active_requests++;
 514        slot->in_use = 1;
 515        slot->results = NULL;
 516        slot->finished = NULL;
 517        slot->callback_data = NULL;
 518        slot->callback_func = NULL;
 519        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 520        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 521        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 522        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 523        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 524        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 525        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 526        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 527        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 528        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 529        if (http_auth.password)
 530                init_curl_http_auth(slot->curl);
 531
 532        return slot;
 533}
 534
 535int start_active_slot(struct active_request_slot *slot)
 536{
 537#ifdef USE_CURL_MULTI
 538        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 539        int num_transfers;
 540
 541        if (curlm_result != CURLM_OK &&
 542            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 543                active_requests--;
 544                slot->in_use = 0;
 545                return 0;
 546        }
 547
 548        /*
 549         * We know there must be something to do, since we just added
 550         * something.
 551         */
 552        curl_multi_perform(curlm, &num_transfers);
 553#endif
 554        return 1;
 555}
 556
 557#ifdef USE_CURL_MULTI
 558struct fill_chain {
 559        void *data;
 560        int (*fill)(void *);
 561        struct fill_chain *next;
 562};
 563
 564static struct fill_chain *fill_cfg;
 565
 566void add_fill_function(void *data, int (*fill)(void *))
 567{
 568        struct fill_chain *new = xmalloc(sizeof(*new));
 569        struct fill_chain **linkp = &fill_cfg;
 570        new->data = data;
 571        new->fill = fill;
 572        new->next = NULL;
 573        while (*linkp)
 574                linkp = &(*linkp)->next;
 575        *linkp = new;
 576}
 577
 578void fill_active_slots(void)
 579{
 580        struct active_request_slot *slot = active_queue_head;
 581
 582        while (active_requests < max_requests) {
 583                struct fill_chain *fill;
 584                for (fill = fill_cfg; fill; fill = fill->next)
 585                        if (fill->fill(fill->data))
 586                                break;
 587
 588                if (!fill)
 589                        break;
 590        }
 591
 592        while (slot != NULL) {
 593                if (!slot->in_use && slot->curl != NULL
 594                        && curl_session_count > min_curl_sessions) {
 595                        curl_easy_cleanup(slot->curl);
 596                        slot->curl = NULL;
 597                        curl_session_count--;
 598                }
 599                slot = slot->next;
 600        }
 601}
 602
 603void step_active_slots(void)
 604{
 605        int num_transfers;
 606        CURLMcode curlm_result;
 607
 608        do {
 609                curlm_result = curl_multi_perform(curlm, &num_transfers);
 610        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 611        if (num_transfers < active_requests) {
 612                process_curl_messages();
 613                fill_active_slots();
 614        }
 615}
 616#endif
 617
 618void run_active_slot(struct active_request_slot *slot)
 619{
 620#ifdef USE_CURL_MULTI
 621        fd_set readfds;
 622        fd_set writefds;
 623        fd_set excfds;
 624        int max_fd;
 625        struct timeval select_timeout;
 626        int finished = 0;
 627
 628        slot->finished = &finished;
 629        while (!finished) {
 630                step_active_slots();
 631
 632                if (slot->in_use) {
 633#if LIBCURL_VERSION_NUM >= 0x070f04
 634                        long curl_timeout;
 635                        curl_multi_timeout(curlm, &curl_timeout);
 636                        if (curl_timeout == 0) {
 637                                continue;
 638                        } else if (curl_timeout == -1) {
 639                                select_timeout.tv_sec  = 0;
 640                                select_timeout.tv_usec = 50000;
 641                        } else {
 642                                select_timeout.tv_sec  =  curl_timeout / 1000;
 643                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 644                        }
 645#else
 646                        select_timeout.tv_sec  = 0;
 647                        select_timeout.tv_usec = 50000;
 648#endif
 649
 650                        max_fd = -1;
 651                        FD_ZERO(&readfds);
 652                        FD_ZERO(&writefds);
 653                        FD_ZERO(&excfds);
 654                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 655
 656                        /*
 657                         * It can happen that curl_multi_timeout returns a pathologically
 658                         * long timeout when curl_multi_fdset returns no file descriptors
 659                         * to read.  See commit message for more details.
 660                         */
 661                        if (max_fd < 0 &&
 662                            (select_timeout.tv_sec > 0 ||
 663                             select_timeout.tv_usec > 50000)) {
 664                                select_timeout.tv_sec  = 0;
 665                                select_timeout.tv_usec = 50000;
 666                        }
 667
 668                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 669                }
 670        }
 671#else
 672        while (slot->in_use) {
 673                slot->curl_result = curl_easy_perform(slot->curl);
 674                finish_active_slot(slot);
 675        }
 676#endif
 677}
 678
 679static void closedown_active_slot(struct active_request_slot *slot)
 680{
 681        active_requests--;
 682        slot->in_use = 0;
 683}
 684
 685static void release_active_slot(struct active_request_slot *slot)
 686{
 687        closedown_active_slot(slot);
 688        if (slot->curl && curl_session_count > min_curl_sessions) {
 689#ifdef USE_CURL_MULTI
 690                curl_multi_remove_handle(curlm, slot->curl);
 691#endif
 692                curl_easy_cleanup(slot->curl);
 693                slot->curl = NULL;
 694                curl_session_count--;
 695        }
 696#ifdef USE_CURL_MULTI
 697        fill_active_slots();
 698#endif
 699}
 700
 701void finish_active_slot(struct active_request_slot *slot)
 702{
 703        closedown_active_slot(slot);
 704        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 705
 706        if (slot->finished != NULL)
 707                (*slot->finished) = 1;
 708
 709        /* Store slot results so they can be read after the slot is reused */
 710        if (slot->results != NULL) {
 711                slot->results->curl_result = slot->curl_result;
 712                slot->results->http_code = slot->http_code;
 713        }
 714
 715        /* Run callback if appropriate */
 716        if (slot->callback_func != NULL)
 717                slot->callback_func(slot->callback_data);
 718}
 719
 720void finish_all_active_slots(void)
 721{
 722        struct active_request_slot *slot = active_queue_head;
 723
 724        while (slot != NULL)
 725                if (slot->in_use) {
 726                        run_active_slot(slot);
 727                        slot = active_queue_head;
 728                } else {
 729                        slot = slot->next;
 730                }
 731}
 732
 733/* Helpers for modifying and creating URLs */
 734static inline int needs_quote(int ch)
 735{
 736        if (((ch >= 'A') && (ch <= 'Z'))
 737                        || ((ch >= 'a') && (ch <= 'z'))
 738                        || ((ch >= '0') && (ch <= '9'))
 739                        || (ch == '/')
 740                        || (ch == '-')
 741                        || (ch == '.'))
 742                return 0;
 743        return 1;
 744}
 745
 746static char *quote_ref_url(const char *base, const char *ref)
 747{
 748        struct strbuf buf = STRBUF_INIT;
 749        const char *cp;
 750        int ch;
 751
 752        end_url_with_slash(&buf, base);
 753
 754        for (cp = ref; (ch = *cp) != 0; cp++)
 755                if (needs_quote(ch))
 756                        strbuf_addf(&buf, "%%%02x", ch);
 757                else
 758                        strbuf_addch(&buf, *cp);
 759
 760        return strbuf_detach(&buf, NULL);
 761}
 762
 763void append_remote_object_url(struct strbuf *buf, const char *url,
 764                              const char *hex,
 765                              int only_two_digit_prefix)
 766{
 767        end_url_with_slash(buf, url);
 768
 769        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 770        if (!only_two_digit_prefix)
 771                strbuf_addf(buf, "%s", hex+2);
 772}
 773
 774char *get_remote_object_url(const char *url, const char *hex,
 775                            int only_two_digit_prefix)
 776{
 777        struct strbuf buf = STRBUF_INIT;
 778        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 779        return strbuf_detach(&buf, NULL);
 780}
 781
 782int handle_curl_result(struct slot_results *results)
 783{
 784        /*
 785         * If we see a failing http code with CURLE_OK, we have turned off
 786         * FAILONERROR (to keep the server's custom error response), and should
 787         * translate the code into failure here.
 788         */
 789        if (results->curl_result == CURLE_OK &&
 790            results->http_code >= 400) {
 791                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
 792                /*
 793                 * Normally curl will already have put the "reason phrase"
 794                 * from the server into curl_errorstr; unfortunately without
 795                 * FAILONERROR it is lost, so we can give only the numeric
 796                 * status code.
 797                 */
 798                snprintf(curl_errorstr, sizeof(curl_errorstr),
 799                         "The requested URL returned error: %ld",
 800                         results->http_code);
 801        }
 802
 803        if (results->curl_result == CURLE_OK) {
 804                credential_approve(&http_auth);
 805                return HTTP_OK;
 806        } else if (missing_target(results))
 807                return HTTP_MISSING_TARGET;
 808        else if (results->http_code == 401) {
 809                if (http_auth.username && http_auth.password) {
 810                        credential_reject(&http_auth);
 811                        return HTTP_NOAUTH;
 812                } else {
 813                        credential_fill(&http_auth);
 814                        return HTTP_REAUTH;
 815                }
 816        } else {
 817#if LIBCURL_VERSION_NUM >= 0x070c00
 818                if (!curl_errorstr[0])
 819                        strlcpy(curl_errorstr,
 820                                curl_easy_strerror(results->curl_result),
 821                                sizeof(curl_errorstr));
 822#endif
 823                return HTTP_ERROR;
 824        }
 825}
 826
 827/* http_request() targets */
 828#define HTTP_REQUEST_STRBUF     0
 829#define HTTP_REQUEST_FILE       1
 830
 831static int http_request(const char *url, struct strbuf *type,
 832                        void *result, int target, int options)
 833{
 834        struct active_request_slot *slot;
 835        struct slot_results results;
 836        struct curl_slist *headers = NULL;
 837        struct strbuf buf = STRBUF_INIT;
 838        int ret;
 839
 840        slot = get_active_slot();
 841        slot->results = &results;
 842        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 843
 844        if (result == NULL) {
 845                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 846        } else {
 847                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 848                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 849
 850                if (target == HTTP_REQUEST_FILE) {
 851                        long posn = ftell(result);
 852                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 853                                         fwrite);
 854                        if (posn > 0) {
 855                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 856                                headers = curl_slist_append(headers, buf.buf);
 857                                strbuf_reset(&buf);
 858                        }
 859                } else
 860                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 861                                         fwrite_buffer);
 862        }
 863
 864        strbuf_addstr(&buf, "Pragma:");
 865        if (options & HTTP_NO_CACHE)
 866                strbuf_addstr(&buf, " no-cache");
 867        if (options & HTTP_KEEP_ERROR)
 868                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
 869
 870        headers = curl_slist_append(headers, buf.buf);
 871
 872        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 873        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 874        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 875
 876        if (start_active_slot(slot)) {
 877                run_active_slot(slot);
 878                ret = handle_curl_result(&results);
 879        } else {
 880                snprintf(curl_errorstr, sizeof(curl_errorstr),
 881                         "failed to start HTTP request");
 882                ret = HTTP_START_FAILED;
 883        }
 884
 885        if (type) {
 886                char *t;
 887                strbuf_reset(type);
 888                curl_easy_getinfo(slot->curl, CURLINFO_CONTENT_TYPE, &t);
 889                if (t)
 890                        strbuf_addstr(type, t);
 891        }
 892
 893        curl_slist_free_all(headers);
 894        strbuf_release(&buf);
 895
 896        return ret;
 897}
 898
 899static int http_request_reauth(const char *url,
 900                               struct strbuf *type,
 901                               void *result, int target,
 902                               int options)
 903{
 904        int ret = http_request(url, type, result, target, options);
 905        if (ret != HTTP_REAUTH)
 906                return ret;
 907
 908        /*
 909         * If we are using KEEP_ERROR, the previous request may have
 910         * put cruft into our output stream; we should clear it out before
 911         * making our next request. We only know how to do this for
 912         * the strbuf case, but that is enough to satisfy current callers.
 913         */
 914        if (options & HTTP_KEEP_ERROR) {
 915                switch (target) {
 916                case HTTP_REQUEST_STRBUF:
 917                        strbuf_reset(result);
 918                        break;
 919                default:
 920                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
 921                }
 922        }
 923        return http_request(url, type, result, target, options);
 924}
 925
 926int http_get_strbuf(const char *url,
 927                    struct strbuf *type,
 928                    struct strbuf *result, int options)
 929{
 930        return http_request_reauth(url, type, result,
 931                                   HTTP_REQUEST_STRBUF, options);
 932}
 933
 934/*
 935 * Downloads a URL and stores the result in the given file.
 936 *
 937 * If a previous interrupted download is detected (i.e. a previous temporary
 938 * file is still around) the download is resumed.
 939 */
 940static int http_get_file(const char *url, const char *filename, int options)
 941{
 942        int ret;
 943        struct strbuf tmpfile = STRBUF_INIT;
 944        FILE *result;
 945
 946        strbuf_addf(&tmpfile, "%s.temp", filename);
 947        result = fopen(tmpfile.buf, "a");
 948        if (! result) {
 949                error("Unable to open local file %s", tmpfile.buf);
 950                ret = HTTP_ERROR;
 951                goto cleanup;
 952        }
 953
 954        ret = http_request_reauth(url, NULL, result, HTTP_REQUEST_FILE, options);
 955        fclose(result);
 956
 957        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 958                ret = HTTP_ERROR;
 959cleanup:
 960        strbuf_release(&tmpfile);
 961        return ret;
 962}
 963
 964int http_fetch_ref(const char *base, struct ref *ref)
 965{
 966        char *url;
 967        struct strbuf buffer = STRBUF_INIT;
 968        int ret = -1;
 969
 970        url = quote_ref_url(base, ref->name);
 971        if (http_get_strbuf(url, NULL, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 972                strbuf_rtrim(&buffer);
 973                if (buffer.len == 40)
 974                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 975                else if (!prefixcmp(buffer.buf, "ref: ")) {
 976                        ref->symref = xstrdup(buffer.buf + 5);
 977                        ret = 0;
 978                }
 979        }
 980
 981        strbuf_release(&buffer);
 982        free(url);
 983        return ret;
 984}
 985
 986/* Helpers for fetching packs */
 987static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 988{
 989        char *url, *tmp;
 990        struct strbuf buf = STRBUF_INIT;
 991
 992        if (http_is_verbose)
 993                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 994
 995        end_url_with_slash(&buf, base_url);
 996        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 997        url = strbuf_detach(&buf, NULL);
 998
 999        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1000        tmp = strbuf_detach(&buf, NULL);
1001
1002        if (http_get_file(url, tmp, 0) != HTTP_OK) {
1003                error("Unable to get pack index %s", url);
1004                free(tmp);
1005                tmp = NULL;
1006        }
1007
1008        free(url);
1009        return tmp;
1010}
1011
1012static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1013        unsigned char *sha1, const char *base_url)
1014{
1015        struct packed_git *new_pack;
1016        char *tmp_idx = NULL;
1017        int ret;
1018
1019        if (has_pack_index(sha1)) {
1020                new_pack = parse_pack_index(sha1, NULL);
1021                if (!new_pack)
1022                        return -1; /* parse_pack_index() already issued error message */
1023                goto add_pack;
1024        }
1025
1026        tmp_idx = fetch_pack_index(sha1, base_url);
1027        if (!tmp_idx)
1028                return -1;
1029
1030        new_pack = parse_pack_index(sha1, tmp_idx);
1031        if (!new_pack) {
1032                unlink(tmp_idx);
1033                free(tmp_idx);
1034
1035                return -1; /* parse_pack_index() already issued error message */
1036        }
1037
1038        ret = verify_pack_index(new_pack);
1039        if (!ret) {
1040                close_pack_index(new_pack);
1041                ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1042        }
1043        free(tmp_idx);
1044        if (ret)
1045                return -1;
1046
1047add_pack:
1048        new_pack->next = *packs_head;
1049        *packs_head = new_pack;
1050        return 0;
1051}
1052
1053int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1054{
1055        int ret = 0, i = 0;
1056        char *url, *data;
1057        struct strbuf buf = STRBUF_INIT;
1058        unsigned char sha1[20];
1059
1060        end_url_with_slash(&buf, base_url);
1061        strbuf_addstr(&buf, "objects/info/packs");
1062        url = strbuf_detach(&buf, NULL);
1063
1064        ret = http_get_strbuf(url, NULL, &buf, HTTP_NO_CACHE);
1065        if (ret != HTTP_OK)
1066                goto cleanup;
1067
1068        data = buf.buf;
1069        while (i < buf.len) {
1070                switch (data[i]) {
1071                case 'P':
1072                        i++;
1073                        if (i + 52 <= buf.len &&
1074                            !prefixcmp(data + i, " pack-") &&
1075                            !prefixcmp(data + i + 46, ".pack\n")) {
1076                                get_sha1_hex(data + i + 6, sha1);
1077                                fetch_and_setup_pack_index(packs_head, sha1,
1078                                                      base_url);
1079                                i += 51;
1080                                break;
1081                        }
1082                default:
1083                        while (i < buf.len && data[i] != '\n')
1084                                i++;
1085                }
1086                i++;
1087        }
1088
1089cleanup:
1090        free(url);
1091        return ret;
1092}
1093
1094void release_http_pack_request(struct http_pack_request *preq)
1095{
1096        if (preq->packfile != NULL) {
1097                fclose(preq->packfile);
1098                preq->packfile = NULL;
1099        }
1100        if (preq->range_header != NULL) {
1101                curl_slist_free_all(preq->range_header);
1102                preq->range_header = NULL;
1103        }
1104        preq->slot = NULL;
1105        free(preq->url);
1106}
1107
1108int finish_http_pack_request(struct http_pack_request *preq)
1109{
1110        struct packed_git **lst;
1111        struct packed_git *p = preq->target;
1112        char *tmp_idx;
1113        struct child_process ip;
1114        const char *ip_argv[8];
1115
1116        close_pack_index(p);
1117
1118        fclose(preq->packfile);
1119        preq->packfile = NULL;
1120
1121        lst = preq->lst;
1122        while (*lst != p)
1123                lst = &((*lst)->next);
1124        *lst = (*lst)->next;
1125
1126        tmp_idx = xstrdup(preq->tmpfile);
1127        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1128               ".idx.temp");
1129
1130        ip_argv[0] = "index-pack";
1131        ip_argv[1] = "-o";
1132        ip_argv[2] = tmp_idx;
1133        ip_argv[3] = preq->tmpfile;
1134        ip_argv[4] = NULL;
1135
1136        memset(&ip, 0, sizeof(ip));
1137        ip.argv = ip_argv;
1138        ip.git_cmd = 1;
1139        ip.no_stdin = 1;
1140        ip.no_stdout = 1;
1141
1142        if (run_command(&ip)) {
1143                unlink(preq->tmpfile);
1144                unlink(tmp_idx);
1145                free(tmp_idx);
1146                return -1;
1147        }
1148
1149        unlink(sha1_pack_index_name(p->sha1));
1150
1151        if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1152         || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1153                free(tmp_idx);
1154                return -1;
1155        }
1156
1157        install_packed_git(p);
1158        free(tmp_idx);
1159        return 0;
1160}
1161
1162struct http_pack_request *new_http_pack_request(
1163        struct packed_git *target, const char *base_url)
1164{
1165        long prev_posn = 0;
1166        char range[RANGE_HEADER_SIZE];
1167        struct strbuf buf = STRBUF_INIT;
1168        struct http_pack_request *preq;
1169
1170        preq = xcalloc(1, sizeof(*preq));
1171        preq->target = target;
1172
1173        end_url_with_slash(&buf, base_url);
1174        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1175                sha1_to_hex(target->sha1));
1176        preq->url = strbuf_detach(&buf, NULL);
1177
1178        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1179                sha1_pack_name(target->sha1));
1180        preq->packfile = fopen(preq->tmpfile, "a");
1181        if (!preq->packfile) {
1182                error("Unable to open local file %s for pack",
1183                      preq->tmpfile);
1184                goto abort;
1185        }
1186
1187        preq->slot = get_active_slot();
1188        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1189        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1190        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1191        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1192                no_pragma_header);
1193
1194        /*
1195         * If there is data present from a previous transfer attempt,
1196         * resume where it left off
1197         */
1198        prev_posn = ftell(preq->packfile);
1199        if (prev_posn>0) {
1200                if (http_is_verbose)
1201                        fprintf(stderr,
1202                                "Resuming fetch of pack %s at byte %ld\n",
1203                                sha1_to_hex(target->sha1), prev_posn);
1204                sprintf(range, "Range: bytes=%ld-", prev_posn);
1205                preq->range_header = curl_slist_append(NULL, range);
1206                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1207                        preq->range_header);
1208        }
1209
1210        return preq;
1211
1212abort:
1213        free(preq->url);
1214        free(preq);
1215        return NULL;
1216}
1217
1218/* Helpers for fetching objects (loose) */
1219static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1220                               void *data)
1221{
1222        unsigned char expn[4096];
1223        size_t size = eltsize * nmemb;
1224        int posn = 0;
1225        struct http_object_request *freq =
1226                (struct http_object_request *)data;
1227        do {
1228                ssize_t retval = xwrite(freq->localfile,
1229                                        (char *) ptr + posn, size - posn);
1230                if (retval < 0)
1231                        return posn;
1232                posn += retval;
1233        } while (posn < size);
1234
1235        freq->stream.avail_in = size;
1236        freq->stream.next_in = (void *)ptr;
1237        do {
1238                freq->stream.next_out = expn;
1239                freq->stream.avail_out = sizeof(expn);
1240                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1241                git_SHA1_Update(&freq->c, expn,
1242                                sizeof(expn) - freq->stream.avail_out);
1243        } while (freq->stream.avail_in && freq->zret == Z_OK);
1244        return size;
1245}
1246
1247struct http_object_request *new_http_object_request(const char *base_url,
1248        unsigned char *sha1)
1249{
1250        char *hex = sha1_to_hex(sha1);
1251        char *filename;
1252        char prevfile[PATH_MAX];
1253        int prevlocal;
1254        char prev_buf[PREV_BUF_SIZE];
1255        ssize_t prev_read = 0;
1256        long prev_posn = 0;
1257        char range[RANGE_HEADER_SIZE];
1258        struct curl_slist *range_header = NULL;
1259        struct http_object_request *freq;
1260
1261        freq = xcalloc(1, sizeof(*freq));
1262        hashcpy(freq->sha1, sha1);
1263        freq->localfile = -1;
1264
1265        filename = sha1_file_name(sha1);
1266        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1267                 "%s.temp", filename);
1268
1269        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1270        unlink_or_warn(prevfile);
1271        rename(freq->tmpfile, prevfile);
1272        unlink_or_warn(freq->tmpfile);
1273
1274        if (freq->localfile != -1)
1275                error("fd leakage in start: %d", freq->localfile);
1276        freq->localfile = open(freq->tmpfile,
1277                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1278        /*
1279         * This could have failed due to the "lazy directory creation";
1280         * try to mkdir the last path component.
1281         */
1282        if (freq->localfile < 0 && errno == ENOENT) {
1283                char *dir = strrchr(freq->tmpfile, '/');
1284                if (dir) {
1285                        *dir = 0;
1286                        mkdir(freq->tmpfile, 0777);
1287                        *dir = '/';
1288                }
1289                freq->localfile = open(freq->tmpfile,
1290                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1291        }
1292
1293        if (freq->localfile < 0) {
1294                error("Couldn't create temporary file %s: %s",
1295                      freq->tmpfile, strerror(errno));
1296                goto abort;
1297        }
1298
1299        git_inflate_init(&freq->stream);
1300
1301        git_SHA1_Init(&freq->c);
1302
1303        freq->url = get_remote_object_url(base_url, hex, 0);
1304
1305        /*
1306         * If a previous temp file is present, process what was already
1307         * fetched.
1308         */
1309        prevlocal = open(prevfile, O_RDONLY);
1310        if (prevlocal != -1) {
1311                do {
1312                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1313                        if (prev_read>0) {
1314                                if (fwrite_sha1_file(prev_buf,
1315                                                     1,
1316                                                     prev_read,
1317                                                     freq) == prev_read) {
1318                                        prev_posn += prev_read;
1319                                } else {
1320                                        prev_read = -1;
1321                                }
1322                        }
1323                } while (prev_read > 0);
1324                close(prevlocal);
1325        }
1326        unlink_or_warn(prevfile);
1327
1328        /*
1329         * Reset inflate/SHA1 if there was an error reading the previous temp
1330         * file; also rewind to the beginning of the local file.
1331         */
1332        if (prev_read == -1) {
1333                memset(&freq->stream, 0, sizeof(freq->stream));
1334                git_inflate_init(&freq->stream);
1335                git_SHA1_Init(&freq->c);
1336                if (prev_posn>0) {
1337                        prev_posn = 0;
1338                        lseek(freq->localfile, 0, SEEK_SET);
1339                        if (ftruncate(freq->localfile, 0) < 0) {
1340                                error("Couldn't truncate temporary file %s: %s",
1341                                          freq->tmpfile, strerror(errno));
1342                                goto abort;
1343                        }
1344                }
1345        }
1346
1347        freq->slot = get_active_slot();
1348
1349        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1350        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1351        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1352        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1353        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1354
1355        /*
1356         * If we have successfully processed data from a previous fetch
1357         * attempt, only fetch the data we don't already have.
1358         */
1359        if (prev_posn>0) {
1360                if (http_is_verbose)
1361                        fprintf(stderr,
1362                                "Resuming fetch of object %s at byte %ld\n",
1363                                hex, prev_posn);
1364                sprintf(range, "Range: bytes=%ld-", prev_posn);
1365                range_header = curl_slist_append(range_header, range);
1366                curl_easy_setopt(freq->slot->curl,
1367                                 CURLOPT_HTTPHEADER, range_header);
1368        }
1369
1370        return freq;
1371
1372abort:
1373        free(freq->url);
1374        free(freq);
1375        return NULL;
1376}
1377
1378void process_http_object_request(struct http_object_request *freq)
1379{
1380        if (freq->slot == NULL)
1381                return;
1382        freq->curl_result = freq->slot->curl_result;
1383        freq->http_code = freq->slot->http_code;
1384        freq->slot = NULL;
1385}
1386
1387int finish_http_object_request(struct http_object_request *freq)
1388{
1389        struct stat st;
1390
1391        close(freq->localfile);
1392        freq->localfile = -1;
1393
1394        process_http_object_request(freq);
1395
1396        if (freq->http_code == 416) {
1397                warning("requested range invalid; we may already have all the data.");
1398        } else if (freq->curl_result != CURLE_OK) {
1399                if (stat(freq->tmpfile, &st) == 0)
1400                        if (st.st_size == 0)
1401                                unlink_or_warn(freq->tmpfile);
1402                return -1;
1403        }
1404
1405        git_inflate_end(&freq->stream);
1406        git_SHA1_Final(freq->real_sha1, &freq->c);
1407        if (freq->zret != Z_STREAM_END) {
1408                unlink_or_warn(freq->tmpfile);
1409                return -1;
1410        }
1411        if (hashcmp(freq->sha1, freq->real_sha1)) {
1412                unlink_or_warn(freq->tmpfile);
1413                return -1;
1414        }
1415        freq->rename =
1416                move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1417
1418        return freq->rename;
1419}
1420
1421void abort_http_object_request(struct http_object_request *freq)
1422{
1423        unlink_or_warn(freq->tmpfile);
1424
1425        release_http_object_request(freq);
1426}
1427
1428void release_http_object_request(struct http_object_request *freq)
1429{
1430        if (freq->localfile != -1) {
1431                close(freq->localfile);
1432                freq->localfile = -1;
1433        }
1434        if (freq->url != NULL) {
1435                free(freq->url);
1436                freq->url = NULL;
1437        }
1438        if (freq->slot != NULL) {
1439                freq->slot->callback_func = NULL;
1440                freq->slot->callback_data = NULL;
1441                release_active_slot(freq->slot);
1442                freq->slot = NULL;
1443        }
1444}