Andrew's git / gitweb.git / http.c
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http.con commit http*: add helper methods for fetching packs (2264dfa)
   1#include "http.h"
   2#include "pack.h"
   3
   4int data_received;
   5int active_requests;
   6int http_is_verbose;
   7
   8#ifdef USE_CURL_MULTI
   9static int max_requests = -1;
  10static CURLM *curlm;
  11#endif
  12#ifndef NO_CURL_EASY_DUPHANDLE
  13static CURL *curl_default;
  14#endif
  15char curl_errorstr[CURL_ERROR_SIZE];
  16
  17static int curl_ssl_verify = -1;
  18static const char *ssl_cert;
  19#if LIBCURL_VERSION_NUM >= 0x070902
  20static const char *ssl_key;
  21#endif
  22#if LIBCURL_VERSION_NUM >= 0x070908
  23static const char *ssl_capath;
  24#endif
  25static const char *ssl_cainfo;
  26static long curl_low_speed_limit = -1;
  27static long curl_low_speed_time = -1;
  28static int curl_ftp_no_epsv;
  29static const char *curl_http_proxy;
  30static char *user_name, *user_pass;
  31
  32static struct curl_slist *pragma_header;
  33
  34struct curl_slist *no_pragma_header;
  35
  36static struct active_request_slot *active_queue_head;
  37
  38size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  39{
  40        size_t size = eltsize * nmemb;
  41        struct buffer *buffer = buffer_;
  42
  43        if (size > buffer->buf.len - buffer->posn)
  44                size = buffer->buf.len - buffer->posn;
  45        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  46        buffer->posn += size;
  47
  48        return size;
  49}
  50
  51#ifndef NO_CURL_IOCTL
  52curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  53{
  54        struct buffer *buffer = clientp;
  55
  56        switch (cmd) {
  57        case CURLIOCMD_NOP:
  58                return CURLIOE_OK;
  59
  60        case CURLIOCMD_RESTARTREAD:
  61                buffer->posn = 0;
  62                return CURLIOE_OK;
  63
  64        default:
  65                return CURLIOE_UNKNOWNCMD;
  66        }
  67}
  68#endif
  69
  70size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  71{
  72        size_t size = eltsize * nmemb;
  73        struct strbuf *buffer = buffer_;
  74
  75        strbuf_add(buffer, ptr, size);
  76        data_received++;
  77        return size;
  78}
  79
  80size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
  81{
  82        data_received++;
  83        return eltsize * nmemb;
  84}
  85
  86static void finish_active_slot(struct active_request_slot *slot);
  87
  88#ifdef USE_CURL_MULTI
  89static void process_curl_messages(void)
  90{
  91        int num_messages;
  92        struct active_request_slot *slot;
  93        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  94
  95        while (curl_message != NULL) {
  96                if (curl_message->msg == CURLMSG_DONE) {
  97                        int curl_result = curl_message->data.result;
  98                        slot = active_queue_head;
  99                        while (slot != NULL &&
 100                               slot->curl != curl_message->easy_handle)
 101                                slot = slot->next;
 102                        if (slot != NULL) {
 103                                curl_multi_remove_handle(curlm, slot->curl);
 104                                slot->curl_result = curl_result;
 105                                finish_active_slot(slot);
 106                        } else {
 107                                fprintf(stderr, "Received DONE message for unknown request!\n");
 108                        }
 109                } else {
 110                        fprintf(stderr, "Unknown CURL message received: %d\n",
 111                                (int)curl_message->msg);
 112                }
 113                curl_message = curl_multi_info_read(curlm, &num_messages);
 114        }
 115}
 116#endif
 117
 118static int http_options(const char *var, const char *value, void *cb)
 119{
 120        if (!strcmp("http.sslverify", var)) {
 121                curl_ssl_verify = git_config_bool(var, value);
 122                return 0;
 123        }
 124        if (!strcmp("http.sslcert", var))
 125                return git_config_string(&ssl_cert, var, value);
 126#if LIBCURL_VERSION_NUM >= 0x070902
 127        if (!strcmp("http.sslkey", var))
 128                return git_config_string(&ssl_key, var, value);
 129#endif
 130#if LIBCURL_VERSION_NUM >= 0x070908
 131        if (!strcmp("http.sslcapath", var))
 132                return git_config_string(&ssl_capath, var, value);
 133#endif
 134        if (!strcmp("http.sslcainfo", var))
 135                return git_config_string(&ssl_cainfo, var, value);
 136#ifdef USE_CURL_MULTI
 137        if (!strcmp("http.maxrequests", var)) {
 138                max_requests = git_config_int(var, value);
 139                return 0;
 140        }
 141#endif
 142        if (!strcmp("http.lowspeedlimit", var)) {
 143                curl_low_speed_limit = (long)git_config_int(var, value);
 144                return 0;
 145        }
 146        if (!strcmp("http.lowspeedtime", var)) {
 147                curl_low_speed_time = (long)git_config_int(var, value);
 148                return 0;
 149        }
 150
 151        if (!strcmp("http.noepsv", var)) {
 152                curl_ftp_no_epsv = git_config_bool(var, value);
 153                return 0;
 154        }
 155        if (!strcmp("http.proxy", var))
 156                return git_config_string(&curl_http_proxy, var, value);
 157
 158        /* Fall back on the default ones */
 159        return git_default_config(var, value, cb);
 160}
 161
 162static void init_curl_http_auth(CURL *result)
 163{
 164        if (user_name) {
 165                struct strbuf up = STRBUF_INIT;
 166                if (!user_pass)
 167                        user_pass = xstrdup(getpass("Password: "));
 168                strbuf_addf(&up, "%s:%s", user_name, user_pass);
 169                curl_easy_setopt(result, CURLOPT_USERPWD,
 170                                 strbuf_detach(&up, NULL));
 171        }
 172}
 173
 174static CURL *get_curl_handle(void)
 175{
 176        CURL *result = curl_easy_init();
 177
 178        if (!curl_ssl_verify) {
 179                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 180                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 181        } else {
 182                /* Verify authenticity of the peer's certificate */
 183                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 184                /* The name in the cert must match whom we tried to connect */
 185                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 186        }
 187
 188#if LIBCURL_VERSION_NUM >= 0x070907
 189        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 190#endif
 191
 192        init_curl_http_auth(result);
 193
 194        if (ssl_cert != NULL)
 195                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 196#if LIBCURL_VERSION_NUM >= 0x070902
 197        if (ssl_key != NULL)
 198                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 199#endif
 200#if LIBCURL_VERSION_NUM >= 0x070908
 201        if (ssl_capath != NULL)
 202                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 203#endif
 204        if (ssl_cainfo != NULL)
 205                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 206        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 207
 208        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 209                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 210                                 curl_low_speed_limit);
 211                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 212                                 curl_low_speed_time);
 213        }
 214
 215        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 216
 217        if (getenv("GIT_CURL_VERBOSE"))
 218                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 219
 220        curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 221
 222        if (curl_ftp_no_epsv)
 223                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 224
 225        if (curl_http_proxy)
 226                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 227
 228        return result;
 229}
 230
 231static void http_auth_init(const char *url)
 232{
 233        char *at, *colon, *cp, *slash;
 234        int len;
 235
 236        cp = strstr(url, "://");
 237        if (!cp)
 238                return;
 239
 240        /*
 241         * Ok, the URL looks like "proto://something".  Which one?
 242         * "proto://<user>:<pass>@<host>/...",
 243         * "proto://<user>@<host>/...", or just
 244         * "proto://<host>/..."?
 245         */
 246        cp += 3;
 247        at = strchr(cp, '@');
 248        colon = strchr(cp, ':');
 249        slash = strchrnul(cp, '/');
 250        if (!at || slash <= at)
 251                return; /* No credentials */
 252        if (!colon || at <= colon) {
 253                /* Only username */
 254                len = at - cp;
 255                user_name = xmalloc(len + 1);
 256                memcpy(user_name, cp, len);
 257                user_name[len] = '\0';
 258                user_pass = NULL;
 259        } else {
 260                len = colon - cp;
 261                user_name = xmalloc(len + 1);
 262                memcpy(user_name, cp, len);
 263                user_name[len] = '\0';
 264                len = at - (colon + 1);
 265                user_pass = xmalloc(len + 1);
 266                memcpy(user_pass, colon + 1, len);
 267                user_pass[len] = '\0';
 268        }
 269}
 270
 271static void set_from_env(const char **var, const char *envname)
 272{
 273        const char *val = getenv(envname);
 274        if (val)
 275                *var = val;
 276}
 277
 278void http_init(struct remote *remote)
 279{
 280        char *low_speed_limit;
 281        char *low_speed_time;
 282
 283        http_is_verbose = 0;
 284
 285        git_config(http_options, NULL);
 286
 287        curl_global_init(CURL_GLOBAL_ALL);
 288
 289        if (remote && remote->http_proxy)
 290                curl_http_proxy = xstrdup(remote->http_proxy);
 291
 292        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 293        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 294
 295#ifdef USE_CURL_MULTI
 296        {
 297                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 298                if (http_max_requests != NULL)
 299                        max_requests = atoi(http_max_requests);
 300        }
 301
 302        curlm = curl_multi_init();
 303        if (curlm == NULL) {
 304                fprintf(stderr, "Error creating curl multi handle.\n");
 305                exit(1);
 306        }
 307#endif
 308
 309        if (getenv("GIT_SSL_NO_VERIFY"))
 310                curl_ssl_verify = 0;
 311
 312        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 313#if LIBCURL_VERSION_NUM >= 0x070902
 314        set_from_env(&ssl_key, "GIT_SSL_KEY");
 315#endif
 316#if LIBCURL_VERSION_NUM >= 0x070908
 317        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 318#endif
 319        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 320
 321        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 322        if (low_speed_limit != NULL)
 323                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 324        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 325        if (low_speed_time != NULL)
 326                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 327
 328        if (curl_ssl_verify == -1)
 329                curl_ssl_verify = 1;
 330
 331#ifdef USE_CURL_MULTI
 332        if (max_requests < 1)
 333                max_requests = DEFAULT_MAX_REQUESTS;
 334#endif
 335
 336        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 337                curl_ftp_no_epsv = 1;
 338
 339        if (remote && remote->url && remote->url[0])
 340                http_auth_init(remote->url[0]);
 341
 342#ifndef NO_CURL_EASY_DUPHANDLE
 343        curl_default = get_curl_handle();
 344#endif
 345}
 346
 347void http_cleanup(void)
 348{
 349        struct active_request_slot *slot = active_queue_head;
 350
 351        while (slot != NULL) {
 352                struct active_request_slot *next = slot->next;
 353                if (slot->curl != NULL) {
 354#ifdef USE_CURL_MULTI
 355                        curl_multi_remove_handle(curlm, slot->curl);
 356#endif
 357                        curl_easy_cleanup(slot->curl);
 358                }
 359                free(slot);
 360                slot = next;
 361        }
 362        active_queue_head = NULL;
 363
 364#ifndef NO_CURL_EASY_DUPHANDLE
 365        curl_easy_cleanup(curl_default);
 366#endif
 367
 368#ifdef USE_CURL_MULTI
 369        curl_multi_cleanup(curlm);
 370#endif
 371        curl_global_cleanup();
 372
 373        curl_slist_free_all(pragma_header);
 374        pragma_header = NULL;
 375
 376        curl_slist_free_all(no_pragma_header);
 377        no_pragma_header = NULL;
 378
 379        if (curl_http_proxy) {
 380                free((void *)curl_http_proxy);
 381                curl_http_proxy = NULL;
 382        }
 383}
 384
 385struct active_request_slot *get_active_slot(void)
 386{
 387        struct active_request_slot *slot = active_queue_head;
 388        struct active_request_slot *newslot;
 389
 390#ifdef USE_CURL_MULTI
 391        int num_transfers;
 392
 393        /* Wait for a slot to open up if the queue is full */
 394        while (active_requests >= max_requests) {
 395                curl_multi_perform(curlm, &num_transfers);
 396                if (num_transfers < active_requests)
 397                        process_curl_messages();
 398        }
 399#endif
 400
 401        while (slot != NULL && slot->in_use)
 402                slot = slot->next;
 403
 404        if (slot == NULL) {
 405                newslot = xmalloc(sizeof(*newslot));
 406                newslot->curl = NULL;
 407                newslot->in_use = 0;
 408                newslot->next = NULL;
 409
 410                slot = active_queue_head;
 411                if (slot == NULL) {
 412                        active_queue_head = newslot;
 413                } else {
 414                        while (slot->next != NULL)
 415                                slot = slot->next;
 416                        slot->next = newslot;
 417                }
 418                slot = newslot;
 419        }
 420
 421        if (slot->curl == NULL) {
 422#ifdef NO_CURL_EASY_DUPHANDLE
 423                slot->curl = get_curl_handle();
 424#else
 425                slot->curl = curl_easy_duphandle(curl_default);
 426#endif
 427        }
 428
 429        active_requests++;
 430        slot->in_use = 1;
 431        slot->local = NULL;
 432        slot->results = NULL;
 433        slot->finished = NULL;
 434        slot->callback_data = NULL;
 435        slot->callback_func = NULL;
 436        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 437        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 438        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 439        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 440        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 441        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 442        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 443
 444        return slot;
 445}
 446
 447int start_active_slot(struct active_request_slot *slot)
 448{
 449#ifdef USE_CURL_MULTI
 450        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 451        int num_transfers;
 452
 453        if (curlm_result != CURLM_OK &&
 454            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 455                active_requests--;
 456                slot->in_use = 0;
 457                return 0;
 458        }
 459
 460        /*
 461         * We know there must be something to do, since we just added
 462         * something.
 463         */
 464        curl_multi_perform(curlm, &num_transfers);
 465#endif
 466        return 1;
 467}
 468
 469#ifdef USE_CURL_MULTI
 470struct fill_chain {
 471        void *data;
 472        int (*fill)(void *);
 473        struct fill_chain *next;
 474};
 475
 476static struct fill_chain *fill_cfg;
 477
 478void add_fill_function(void *data, int (*fill)(void *))
 479{
 480        struct fill_chain *new = xmalloc(sizeof(*new));
 481        struct fill_chain **linkp = &fill_cfg;
 482        new->data = data;
 483        new->fill = fill;
 484        new->next = NULL;
 485        while (*linkp)
 486                linkp = &(*linkp)->next;
 487        *linkp = new;
 488}
 489
 490void fill_active_slots(void)
 491{
 492        struct active_request_slot *slot = active_queue_head;
 493
 494        while (active_requests < max_requests) {
 495                struct fill_chain *fill;
 496                for (fill = fill_cfg; fill; fill = fill->next)
 497                        if (fill->fill(fill->data))
 498                                break;
 499
 500                if (!fill)
 501                        break;
 502        }
 503
 504        while (slot != NULL) {
 505                if (!slot->in_use && slot->curl != NULL) {
 506                        curl_easy_cleanup(slot->curl);
 507                        slot->curl = NULL;
 508                }
 509                slot = slot->next;
 510        }
 511}
 512
 513void step_active_slots(void)
 514{
 515        int num_transfers;
 516        CURLMcode curlm_result;
 517
 518        do {
 519                curlm_result = curl_multi_perform(curlm, &num_transfers);
 520        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 521        if (num_transfers < active_requests) {
 522                process_curl_messages();
 523                fill_active_slots();
 524        }
 525}
 526#endif
 527
 528void run_active_slot(struct active_request_slot *slot)
 529{
 530#ifdef USE_CURL_MULTI
 531        long last_pos = 0;
 532        long current_pos;
 533        fd_set readfds;
 534        fd_set writefds;
 535        fd_set excfds;
 536        int max_fd;
 537        struct timeval select_timeout;
 538        int finished = 0;
 539
 540        slot->finished = &finished;
 541        while (!finished) {
 542                data_received = 0;
 543                step_active_slots();
 544
 545                if (!data_received && slot->local != NULL) {
 546                        current_pos = ftell(slot->local);
 547                        if (current_pos > last_pos)
 548                                data_received++;
 549                        last_pos = current_pos;
 550                }
 551
 552                if (slot->in_use && !data_received) {
 553                        max_fd = 0;
 554                        FD_ZERO(&readfds);
 555                        FD_ZERO(&writefds);
 556                        FD_ZERO(&excfds);
 557                        select_timeout.tv_sec = 0;
 558                        select_timeout.tv_usec = 50000;
 559                        select(max_fd, &readfds, &writefds,
 560                               &excfds, &select_timeout);
 561                }
 562        }
 563#else
 564        while (slot->in_use) {
 565                slot->curl_result = curl_easy_perform(slot->curl);
 566                finish_active_slot(slot);
 567        }
 568#endif
 569}
 570
 571static void closedown_active_slot(struct active_request_slot *slot)
 572{
 573        active_requests--;
 574        slot->in_use = 0;
 575}
 576
 577void release_active_slot(struct active_request_slot *slot)
 578{
 579        closedown_active_slot(slot);
 580        if (slot->curl) {
 581#ifdef USE_CURL_MULTI
 582                curl_multi_remove_handle(curlm, slot->curl);
 583#endif
 584                curl_easy_cleanup(slot->curl);
 585                slot->curl = NULL;
 586        }
 587#ifdef USE_CURL_MULTI
 588        fill_active_slots();
 589#endif
 590}
 591
 592static void finish_active_slot(struct active_request_slot *slot)
 593{
 594        closedown_active_slot(slot);
 595        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 596
 597        if (slot->finished != NULL)
 598                (*slot->finished) = 1;
 599
 600        /* Store slot results so they can be read after the slot is reused */
 601        if (slot->results != NULL) {
 602                slot->results->curl_result = slot->curl_result;
 603                slot->results->http_code = slot->http_code;
 604        }
 605
 606        /* Run callback if appropriate */
 607        if (slot->callback_func != NULL)
 608                slot->callback_func(slot->callback_data);
 609}
 610
 611void finish_all_active_slots(void)
 612{
 613        struct active_request_slot *slot = active_queue_head;
 614
 615        while (slot != NULL)
 616                if (slot->in_use) {
 617                        run_active_slot(slot);
 618                        slot = active_queue_head;
 619                } else {
 620                        slot = slot->next;
 621                }
 622}
 623
 624/* Helpers for modifying and creating URLs */
 625static inline int needs_quote(int ch)
 626{
 627        if (((ch >= 'A') && (ch <= 'Z'))
 628                        || ((ch >= 'a') && (ch <= 'z'))
 629                        || ((ch >= '0') && (ch <= '9'))
 630                        || (ch == '/')
 631                        || (ch == '-')
 632                        || (ch == '.'))
 633                return 0;
 634        return 1;
 635}
 636
 637static inline int hex(int v)
 638{
 639        if (v < 10)
 640                return '0' + v;
 641        else
 642                return 'A' + v - 10;
 643}
 644
 645static void end_url_with_slash(struct strbuf *buf, const char *url)
 646{
 647        strbuf_addstr(buf, url);
 648        if (buf->len && buf->buf[buf->len - 1] != '/')
 649                strbuf_addstr(buf, "/");
 650}
 651
 652static char *quote_ref_url(const char *base, const char *ref)
 653{
 654        struct strbuf buf = STRBUF_INIT;
 655        const char *cp;
 656        int ch;
 657
 658        end_url_with_slash(&buf, base);
 659
 660        for (cp = ref; (ch = *cp) != 0; cp++)
 661                if (needs_quote(ch))
 662                        strbuf_addf(&buf, "%%%02x", ch);
 663                else
 664                        strbuf_addch(&buf, *cp);
 665
 666        return strbuf_detach(&buf, NULL);
 667}
 668
 669/* http_request() targets */
 670#define HTTP_REQUEST_STRBUF     0
 671#define HTTP_REQUEST_FILE       1
 672
 673static int http_request(const char *url, void *result, int target, int options)
 674{
 675        struct active_request_slot *slot;
 676        struct slot_results results;
 677        struct curl_slist *headers = NULL;
 678        struct strbuf buf = STRBUF_INIT;
 679        int ret;
 680
 681        slot = get_active_slot();
 682        slot->results = &results;
 683        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 684
 685        if (result == NULL) {
 686                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 687        } else {
 688                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 689                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 690
 691                if (target == HTTP_REQUEST_FILE) {
 692                        long posn = ftell(result);
 693                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 694                                         fwrite);
 695                        if (posn > 0) {
 696                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 697                                headers = curl_slist_append(headers, buf.buf);
 698                                strbuf_reset(&buf);
 699                        }
 700                        slot->local = result;
 701                } else
 702                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 703                                         fwrite_buffer);
 704        }
 705
 706        strbuf_addstr(&buf, "Pragma:");
 707        if (options & HTTP_NO_CACHE)
 708                strbuf_addstr(&buf, " no-cache");
 709
 710        headers = curl_slist_append(headers, buf.buf);
 711
 712        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 713        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 714
 715        if (start_active_slot(slot)) {
 716                run_active_slot(slot);
 717                if (results.curl_result == CURLE_OK)
 718                        ret = HTTP_OK;
 719                else if (missing_target(&results))
 720                        ret = HTTP_MISSING_TARGET;
 721                else
 722                        ret = HTTP_ERROR;
 723        } else {
 724                error("Unable to start HTTP request for %s", url);
 725                ret = HTTP_START_FAILED;
 726        }
 727
 728        slot->local = NULL;
 729        curl_slist_free_all(headers);
 730        strbuf_release(&buf);
 731
 732        return ret;
 733}
 734
 735int http_get_strbuf(const char *url, struct strbuf *result, int options)
 736{
 737        return http_request(url, result, HTTP_REQUEST_STRBUF, options);
 738}
 739
 740int http_get_file(const char *url, const char *filename, int options)
 741{
 742        int ret;
 743        struct strbuf tmpfile = STRBUF_INIT;
 744        FILE *result;
 745
 746        strbuf_addf(&tmpfile, "%s.temp", filename);
 747        result = fopen(tmpfile.buf, "a");
 748        if (! result) {
 749                error("Unable to open local file %s", tmpfile.buf);
 750                ret = HTTP_ERROR;
 751                goto cleanup;
 752        }
 753
 754        ret = http_request(url, result, HTTP_REQUEST_FILE, options);
 755        fclose(result);
 756
 757        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 758                ret = HTTP_ERROR;
 759cleanup:
 760        strbuf_release(&tmpfile);
 761        return ret;
 762}
 763
 764int http_error(const char *url, int ret)
 765{
 766        /* http_request has already handled HTTP_START_FAILED. */
 767        if (ret != HTTP_START_FAILED)
 768                error("%s while accessing %s\n", curl_errorstr, url);
 769
 770        return ret;
 771}
 772
 773int http_fetch_ref(const char *base, struct ref *ref)
 774{
 775        char *url;
 776        struct strbuf buffer = STRBUF_INIT;
 777        int ret = -1;
 778
 779        url = quote_ref_url(base, ref->name);
 780        if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 781                strbuf_rtrim(&buffer);
 782                if (buffer.len == 40)
 783                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 784                else if (!prefixcmp(buffer.buf, "ref: ")) {
 785                        ref->symref = xstrdup(buffer.buf + 5);
 786                        ret = 0;
 787                }
 788        }
 789
 790        strbuf_release(&buffer);
 791        free(url);
 792        return ret;
 793}
 794
 795/* Helpers for fetching packs */
 796static int fetch_pack_index(unsigned char *sha1, const char *base_url)
 797{
 798        int ret = 0;
 799        char *hex = xstrdup(sha1_to_hex(sha1));
 800        char *filename;
 801        char *url;
 802        struct strbuf buf = STRBUF_INIT;
 803
 804        /* Don't use the index if the pack isn't there */
 805        end_url_with_slash(&buf, base_url);
 806        strbuf_addf(&buf, "objects/pack/pack-%s.pack", hex);
 807        url = strbuf_detach(&buf, 0);
 808
 809        if (http_get_strbuf(url, NULL, 0)) {
 810                ret = error("Unable to verify pack %s is available",
 811                            hex);
 812                goto cleanup;
 813        }
 814
 815        if (has_pack_index(sha1)) {
 816                ret = 0;
 817                goto cleanup;
 818        }
 819
 820        if (http_is_verbose)
 821                fprintf(stderr, "Getting index for pack %s\n", hex);
 822
 823        end_url_with_slash(&buf, base_url);
 824        strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
 825        url = strbuf_detach(&buf, NULL);
 826
 827        filename = sha1_pack_index_name(sha1);
 828        if (http_get_file(url, filename, 0) != HTTP_OK)
 829                ret = error("Unable to get pack index %s\n", url);
 830
 831cleanup:
 832        free(hex);
 833        free(url);
 834        return ret;
 835}
 836
 837static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 838        unsigned char *sha1, const char *base_url)
 839{
 840        struct packed_git *new_pack;
 841
 842        if (fetch_pack_index(sha1, base_url))
 843                return -1;
 844
 845        new_pack = parse_pack_index(sha1);
 846        if (!new_pack)
 847                return -1; /* parse_pack_index() already issued error message */
 848        new_pack->next = *packs_head;
 849        *packs_head = new_pack;
 850        return 0;
 851}
 852
 853int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 854{
 855        int ret = 0, i = 0;
 856        char *url, *data;
 857        struct strbuf buf = STRBUF_INIT;
 858        unsigned char sha1[20];
 859
 860        end_url_with_slash(&buf, base_url);
 861        strbuf_addstr(&buf, "objects/info/packs");
 862        url = strbuf_detach(&buf, NULL);
 863
 864        ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 865        if (ret != HTTP_OK)
 866                goto cleanup;
 867
 868        data = buf.buf;
 869        while (i < buf.len) {
 870                switch (data[i]) {
 871                case 'P':
 872                        i++;
 873                        if (i + 52 <= buf.len &&
 874                            !prefixcmp(data + i, " pack-") &&
 875                            !prefixcmp(data + i + 46, ".pack\n")) {
 876                                get_sha1_hex(data + i + 6, sha1);
 877                                fetch_and_setup_pack_index(packs_head, sha1,
 878                                                      base_url);
 879                                i += 51;
 880                                break;
 881                        }
 882                default:
 883                        while (i < buf.len && data[i] != '\n')
 884                                i++;
 885                }
 886                i++;
 887        }
 888
 889cleanup:
 890        free(url);
 891        return ret;
 892}
 893
 894void release_http_pack_request(struct http_pack_request *preq)
 895{
 896        if (preq->packfile != NULL) {
 897                fclose(preq->packfile);
 898                preq->packfile = NULL;
 899                preq->slot->local = NULL;
 900        }
 901        if (preq->range_header != NULL) {
 902                curl_slist_free_all(preq->range_header);
 903                preq->range_header = NULL;
 904        }
 905        preq->slot = NULL;
 906        free(preq->url);
 907}
 908
 909int finish_http_pack_request(struct http_pack_request *preq)
 910{
 911        int ret;
 912        struct packed_git **lst;
 913
 914        preq->target->pack_size = ftell(preq->packfile);
 915
 916        if (preq->packfile != NULL) {
 917                fclose(preq->packfile);
 918                preq->packfile = NULL;
 919                preq->slot->local = NULL;
 920        }
 921
 922        ret = move_temp_to_file(preq->tmpfile, preq->filename);
 923        if (ret)
 924                return ret;
 925
 926        lst = preq->lst;
 927        while (*lst != preq->target)
 928                lst = &((*lst)->next);
 929        *lst = (*lst)->next;
 930
 931        if (verify_pack(preq->target))
 932                return -1;
 933        install_packed_git(preq->target);
 934
 935        return 0;
 936}
 937
 938struct http_pack_request *new_http_pack_request(
 939        struct packed_git *target, const char *base_url)
 940{
 941        char *url;
 942        char *filename;
 943        long prev_posn = 0;
 944        char range[RANGE_HEADER_SIZE];
 945        struct strbuf buf = STRBUF_INIT;
 946        struct http_pack_request *preq;
 947
 948        preq = xmalloc(sizeof(*preq));
 949        preq->target = target;
 950        preq->range_header = NULL;
 951
 952        end_url_with_slash(&buf, base_url);
 953        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
 954                sha1_to_hex(target->sha1));
 955        url = strbuf_detach(&buf, NULL);
 956        preq->url = xstrdup(url);
 957
 958        filename = sha1_pack_name(target->sha1);
 959        snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
 960        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
 961        preq->packfile = fopen(preq->tmpfile, "a");
 962        if (!preq->packfile) {
 963                error("Unable to open local file %s for pack",
 964                      preq->tmpfile);
 965                goto abort;
 966        }
 967
 968        preq->slot = get_active_slot();
 969        preq->slot->local = preq->packfile;
 970        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
 971        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 972        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, url);
 973        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
 974                no_pragma_header);
 975
 976        /*
 977         * If there is data present from a previous transfer attempt,
 978         * resume where it left off
 979         */
 980        prev_posn = ftell(preq->packfile);
 981        if (prev_posn>0) {
 982                if (http_is_verbose)
 983                        fprintf(stderr,
 984                                "Resuming fetch of pack %s at byte %ld\n",
 985                                sha1_to_hex(target->sha1), prev_posn);
 986                sprintf(range, "Range: bytes=%ld-", prev_posn);
 987                preq->range_header = curl_slist_append(NULL, range);
 988                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
 989                        preq->range_header);
 990        }
 991
 992        return preq;
 993
 994abort:
 995        free(filename);
 996        return NULL;
 997}