Andrew's git / gitweb.git / http.c
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http.con commit string-list: rename the include guard to STRING_LIST_H (0afcb5f)
   1#include "http.h"
   2#include "pack.h"
   3#include "sideband.h"
   4
   5int data_received;
   6int active_requests;
   7int http_is_verbose;
   8size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
   9
  10#ifdef USE_CURL_MULTI
  11static int max_requests = -1;
  12static CURLM *curlm;
  13#endif
  14#ifndef NO_CURL_EASY_DUPHANDLE
  15static CURL *curl_default;
  16#endif
  17
  18#define PREV_BUF_SIZE 4096
  19#define RANGE_HEADER_SIZE 30
  20
  21char curl_errorstr[CURL_ERROR_SIZE];
  22
  23static int curl_ssl_verify = -1;
  24static const char *ssl_cert;
  25#if LIBCURL_VERSION_NUM >= 0x070903
  26static const char *ssl_key;
  27#endif
  28#if LIBCURL_VERSION_NUM >= 0x070908
  29static const char *ssl_capath;
  30#endif
  31static const char *ssl_cainfo;
  32static long curl_low_speed_limit = -1;
  33static long curl_low_speed_time = -1;
  34static int curl_ftp_no_epsv;
  35static const char *curl_http_proxy;
  36static char *user_name, *user_pass;
  37
  38#if LIBCURL_VERSION_NUM >= 0x071700
  39/* Use CURLOPT_KEYPASSWD as is */
  40#elif LIBCURL_VERSION_NUM >= 0x070903
  41#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  42#else
  43#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  44#endif
  45
  46static char *ssl_cert_password;
  47static int ssl_cert_password_required;
  48
  49static struct curl_slist *pragma_header;
  50static struct curl_slist *no_pragma_header;
  51
  52static struct active_request_slot *active_queue_head;
  53
  54size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  55{
  56        size_t size = eltsize * nmemb;
  57        struct buffer *buffer = buffer_;
  58
  59        if (size > buffer->buf.len - buffer->posn)
  60                size = buffer->buf.len - buffer->posn;
  61        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  62        buffer->posn += size;
  63
  64        return size;
  65}
  66
  67#ifndef NO_CURL_IOCTL
  68curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  69{
  70        struct buffer *buffer = clientp;
  71
  72        switch (cmd) {
  73        case CURLIOCMD_NOP:
  74                return CURLIOE_OK;
  75
  76        case CURLIOCMD_RESTARTREAD:
  77                buffer->posn = 0;
  78                return CURLIOE_OK;
  79
  80        default:
  81                return CURLIOE_UNKNOWNCMD;
  82        }
  83}
  84#endif
  85
  86size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  87{
  88        size_t size = eltsize * nmemb;
  89        struct strbuf *buffer = buffer_;
  90
  91        strbuf_add(buffer, ptr, size);
  92        data_received++;
  93        return size;
  94}
  95
  96size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
  97{
  98        data_received++;
  99        return eltsize * nmemb;
 100}
 101
 102#ifdef USE_CURL_MULTI
 103static void process_curl_messages(void)
 104{
 105        int num_messages;
 106        struct active_request_slot *slot;
 107        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 108
 109        while (curl_message != NULL) {
 110                if (curl_message->msg == CURLMSG_DONE) {
 111                        int curl_result = curl_message->data.result;
 112                        slot = active_queue_head;
 113                        while (slot != NULL &&
 114                               slot->curl != curl_message->easy_handle)
 115                                slot = slot->next;
 116                        if (slot != NULL) {
 117                                curl_multi_remove_handle(curlm, slot->curl);
 118                                slot->curl_result = curl_result;
 119                                finish_active_slot(slot);
 120                        } else {
 121                                fprintf(stderr, "Received DONE message for unknown request!\n");
 122                        }
 123                } else {
 124                        fprintf(stderr, "Unknown CURL message received: %d\n",
 125                                (int)curl_message->msg);
 126                }
 127                curl_message = curl_multi_info_read(curlm, &num_messages);
 128        }
 129}
 130#endif
 131
 132static int http_options(const char *var, const char *value, void *cb)
 133{
 134        if (!strcmp("http.sslverify", var)) {
 135                curl_ssl_verify = git_config_bool(var, value);
 136                return 0;
 137        }
 138        if (!strcmp("http.sslcert", var))
 139                return git_config_string(&ssl_cert, var, value);
 140#if LIBCURL_VERSION_NUM >= 0x070903
 141        if (!strcmp("http.sslkey", var))
 142                return git_config_string(&ssl_key, var, value);
 143#endif
 144#if LIBCURL_VERSION_NUM >= 0x070908
 145        if (!strcmp("http.sslcapath", var))
 146                return git_config_string(&ssl_capath, var, value);
 147#endif
 148        if (!strcmp("http.sslcainfo", var))
 149                return git_config_string(&ssl_cainfo, var, value);
 150        if (!strcmp("http.sslcertpasswordprotected", var)) {
 151                if (git_config_bool(var, value))
 152                        ssl_cert_password_required = 1;
 153                return 0;
 154        }
 155#ifdef USE_CURL_MULTI
 156        if (!strcmp("http.maxrequests", var)) {
 157                max_requests = git_config_int(var, value);
 158                return 0;
 159        }
 160#endif
 161        if (!strcmp("http.lowspeedlimit", var)) {
 162                curl_low_speed_limit = (long)git_config_int(var, value);
 163                return 0;
 164        }
 165        if (!strcmp("http.lowspeedtime", var)) {
 166                curl_low_speed_time = (long)git_config_int(var, value);
 167                return 0;
 168        }
 169
 170        if (!strcmp("http.noepsv", var)) {
 171                curl_ftp_no_epsv = git_config_bool(var, value);
 172                return 0;
 173        }
 174        if (!strcmp("http.proxy", var))
 175                return git_config_string(&curl_http_proxy, var, value);
 176
 177        if (!strcmp("http.postbuffer", var)) {
 178                http_post_buffer = git_config_int(var, value);
 179                if (http_post_buffer < LARGE_PACKET_MAX)
 180                        http_post_buffer = LARGE_PACKET_MAX;
 181                return 0;
 182        }
 183
 184        /* Fall back on the default ones */
 185        return git_default_config(var, value, cb);
 186}
 187
 188static void init_curl_http_auth(CURL *result)
 189{
 190        if (user_name) {
 191                struct strbuf up = STRBUF_INIT;
 192                if (!user_pass)
 193                        user_pass = xstrdup(getpass("Password: "));
 194                strbuf_addf(&up, "%s:%s", user_name, user_pass);
 195                curl_easy_setopt(result, CURLOPT_USERPWD,
 196                                 strbuf_detach(&up, NULL));
 197        }
 198}
 199
 200static int has_cert_password(void)
 201{
 202        if (ssl_cert_password != NULL)
 203                return 1;
 204        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 205                return 0;
 206        /* Only prompt the user once. */
 207        ssl_cert_password_required = -1;
 208        ssl_cert_password = getpass("Certificate Password: ");
 209        if (ssl_cert_password != NULL) {
 210                ssl_cert_password = xstrdup(ssl_cert_password);
 211                return 1;
 212        } else
 213                return 0;
 214}
 215
 216static CURL *get_curl_handle(void)
 217{
 218        CURL *result = curl_easy_init();
 219
 220        if (!curl_ssl_verify) {
 221                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 222                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 223        } else {
 224                /* Verify authenticity of the peer's certificate */
 225                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 226                /* The name in the cert must match whom we tried to connect */
 227                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 228        }
 229
 230#if LIBCURL_VERSION_NUM >= 0x070907
 231        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 232#endif
 233
 234        init_curl_http_auth(result);
 235
 236        if (ssl_cert != NULL)
 237                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 238        if (has_cert_password())
 239                curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
 240#if LIBCURL_VERSION_NUM >= 0x070903
 241        if (ssl_key != NULL)
 242                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 243#endif
 244#if LIBCURL_VERSION_NUM >= 0x070908
 245        if (ssl_capath != NULL)
 246                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 247#endif
 248        if (ssl_cainfo != NULL)
 249                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 250        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 251
 252        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 253                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 254                                 curl_low_speed_limit);
 255                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 256                                 curl_low_speed_time);
 257        }
 258
 259        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 260
 261        if (getenv("GIT_CURL_VERBOSE"))
 262                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 263
 264        curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 265
 266        if (curl_ftp_no_epsv)
 267                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 268
 269        if (curl_http_proxy)
 270                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 271
 272        return result;
 273}
 274
 275static void http_auth_init(const char *url)
 276{
 277        char *at, *colon, *cp, *slash;
 278        int len;
 279
 280        cp = strstr(url, "://");
 281        if (!cp)
 282                return;
 283
 284        /*
 285         * Ok, the URL looks like "proto://something".  Which one?
 286         * "proto://<user>:<pass>@<host>/...",
 287         * "proto://<user>@<host>/...", or just
 288         * "proto://<host>/..."?
 289         */
 290        cp += 3;
 291        at = strchr(cp, '@');
 292        colon = strchr(cp, ':');
 293        slash = strchrnul(cp, '/');
 294        if (!at || slash <= at)
 295                return; /* No credentials */
 296        if (!colon || at <= colon) {
 297                /* Only username */
 298                len = at - cp;
 299                user_name = xmalloc(len + 1);
 300                memcpy(user_name, cp, len);
 301                user_name[len] = '\0';
 302                user_pass = NULL;
 303        } else {
 304                len = colon - cp;
 305                user_name = xmalloc(len + 1);
 306                memcpy(user_name, cp, len);
 307                user_name[len] = '\0';
 308                len = at - (colon + 1);
 309                user_pass = xmalloc(len + 1);
 310                memcpy(user_pass, colon + 1, len);
 311                user_pass[len] = '\0';
 312        }
 313}
 314
 315static void set_from_env(const char **var, const char *envname)
 316{
 317        const char *val = getenv(envname);
 318        if (val)
 319                *var = val;
 320}
 321
 322void http_init(struct remote *remote)
 323{
 324        char *low_speed_limit;
 325        char *low_speed_time;
 326
 327        http_is_verbose = 0;
 328
 329        git_config(http_options, NULL);
 330
 331        curl_global_init(CURL_GLOBAL_ALL);
 332
 333        if (remote && remote->http_proxy)
 334                curl_http_proxy = xstrdup(remote->http_proxy);
 335
 336        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 337        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 338
 339#ifdef USE_CURL_MULTI
 340        {
 341                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 342                if (http_max_requests != NULL)
 343                        max_requests = atoi(http_max_requests);
 344        }
 345
 346        curlm = curl_multi_init();
 347        if (curlm == NULL) {
 348                fprintf(stderr, "Error creating curl multi handle.\n");
 349                exit(1);
 350        }
 351#endif
 352
 353        if (getenv("GIT_SSL_NO_VERIFY"))
 354                curl_ssl_verify = 0;
 355
 356        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 357#if LIBCURL_VERSION_NUM >= 0x070903
 358        set_from_env(&ssl_key, "GIT_SSL_KEY");
 359#endif
 360#if LIBCURL_VERSION_NUM >= 0x070908
 361        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 362#endif
 363        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 364
 365        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 366        if (low_speed_limit != NULL)
 367                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 368        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 369        if (low_speed_time != NULL)
 370                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 371
 372        if (curl_ssl_verify == -1)
 373                curl_ssl_verify = 1;
 374
 375#ifdef USE_CURL_MULTI
 376        if (max_requests < 1)
 377                max_requests = DEFAULT_MAX_REQUESTS;
 378#endif
 379
 380        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 381                curl_ftp_no_epsv = 1;
 382
 383        if (remote && remote->url && remote->url[0]) {
 384                http_auth_init(remote->url[0]);
 385                if (!ssl_cert_password_required &&
 386                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 387                    !prefixcmp(remote->url[0], "https://"))
 388                        ssl_cert_password_required = 1;
 389        }
 390
 391#ifndef NO_CURL_EASY_DUPHANDLE
 392        curl_default = get_curl_handle();
 393#endif
 394}
 395
 396void http_cleanup(void)
 397{
 398        struct active_request_slot *slot = active_queue_head;
 399
 400        while (slot != NULL) {
 401                struct active_request_slot *next = slot->next;
 402                if (slot->curl != NULL) {
 403#ifdef USE_CURL_MULTI
 404                        curl_multi_remove_handle(curlm, slot->curl);
 405#endif
 406                        curl_easy_cleanup(slot->curl);
 407                }
 408                free(slot);
 409                slot = next;
 410        }
 411        active_queue_head = NULL;
 412
 413#ifndef NO_CURL_EASY_DUPHANDLE
 414        curl_easy_cleanup(curl_default);
 415#endif
 416
 417#ifdef USE_CURL_MULTI
 418        curl_multi_cleanup(curlm);
 419#endif
 420        curl_global_cleanup();
 421
 422        curl_slist_free_all(pragma_header);
 423        pragma_header = NULL;
 424
 425        curl_slist_free_all(no_pragma_header);
 426        no_pragma_header = NULL;
 427
 428        if (curl_http_proxy) {
 429                free((void *)curl_http_proxy);
 430                curl_http_proxy = NULL;
 431        }
 432
 433        if (ssl_cert_password != NULL) {
 434                memset(ssl_cert_password, 0, strlen(ssl_cert_password));
 435                free(ssl_cert_password);
 436                ssl_cert_password = NULL;
 437        }
 438        ssl_cert_password_required = 0;
 439}
 440
 441struct active_request_slot *get_active_slot(void)
 442{
 443        struct active_request_slot *slot = active_queue_head;
 444        struct active_request_slot *newslot;
 445
 446#ifdef USE_CURL_MULTI
 447        int num_transfers;
 448
 449        /* Wait for a slot to open up if the queue is full */
 450        while (active_requests >= max_requests) {
 451                curl_multi_perform(curlm, &num_transfers);
 452                if (num_transfers < active_requests)
 453                        process_curl_messages();
 454        }
 455#endif
 456
 457        while (slot != NULL && slot->in_use)
 458                slot = slot->next;
 459
 460        if (slot == NULL) {
 461                newslot = xmalloc(sizeof(*newslot));
 462                newslot->curl = NULL;
 463                newslot->in_use = 0;
 464                newslot->next = NULL;
 465
 466                slot = active_queue_head;
 467                if (slot == NULL) {
 468                        active_queue_head = newslot;
 469                } else {
 470                        while (slot->next != NULL)
 471                                slot = slot->next;
 472                        slot->next = newslot;
 473                }
 474                slot = newslot;
 475        }
 476
 477        if (slot->curl == NULL) {
 478#ifdef NO_CURL_EASY_DUPHANDLE
 479                slot->curl = get_curl_handle();
 480#else
 481                slot->curl = curl_easy_duphandle(curl_default);
 482#endif
 483        }
 484
 485        active_requests++;
 486        slot->in_use = 1;
 487        slot->local = NULL;
 488        slot->results = NULL;
 489        slot->finished = NULL;
 490        slot->callback_data = NULL;
 491        slot->callback_func = NULL;
 492        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 493        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 494        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 495        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 496        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 497        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 498        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 499
 500        return slot;
 501}
 502
 503int start_active_slot(struct active_request_slot *slot)
 504{
 505#ifdef USE_CURL_MULTI
 506        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 507        int num_transfers;
 508
 509        if (curlm_result != CURLM_OK &&
 510            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 511                active_requests--;
 512                slot->in_use = 0;
 513                return 0;
 514        }
 515
 516        /*
 517         * We know there must be something to do, since we just added
 518         * something.
 519         */
 520        curl_multi_perform(curlm, &num_transfers);
 521#endif
 522        return 1;
 523}
 524
 525#ifdef USE_CURL_MULTI
 526struct fill_chain {
 527        void *data;
 528        int (*fill)(void *);
 529        struct fill_chain *next;
 530};
 531
 532static struct fill_chain *fill_cfg;
 533
 534void add_fill_function(void *data, int (*fill)(void *))
 535{
 536        struct fill_chain *new = xmalloc(sizeof(*new));
 537        struct fill_chain **linkp = &fill_cfg;
 538        new->data = data;
 539        new->fill = fill;
 540        new->next = NULL;
 541        while (*linkp)
 542                linkp = &(*linkp)->next;
 543        *linkp = new;
 544}
 545
 546void fill_active_slots(void)
 547{
 548        struct active_request_slot *slot = active_queue_head;
 549
 550        while (active_requests < max_requests) {
 551                struct fill_chain *fill;
 552                for (fill = fill_cfg; fill; fill = fill->next)
 553                        if (fill->fill(fill->data))
 554                                break;
 555
 556                if (!fill)
 557                        break;
 558        }
 559
 560        while (slot != NULL) {
 561                if (!slot->in_use && slot->curl != NULL) {
 562                        curl_easy_cleanup(slot->curl);
 563                        slot->curl = NULL;
 564                }
 565                slot = slot->next;
 566        }
 567}
 568
 569void step_active_slots(void)
 570{
 571        int num_transfers;
 572        CURLMcode curlm_result;
 573
 574        do {
 575                curlm_result = curl_multi_perform(curlm, &num_transfers);
 576        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 577        if (num_transfers < active_requests) {
 578                process_curl_messages();
 579                fill_active_slots();
 580        }
 581}
 582#endif
 583
 584void run_active_slot(struct active_request_slot *slot)
 585{
 586#ifdef USE_CURL_MULTI
 587        long last_pos = 0;
 588        long current_pos;
 589        fd_set readfds;
 590        fd_set writefds;
 591        fd_set excfds;
 592        int max_fd;
 593        struct timeval select_timeout;
 594        int finished = 0;
 595
 596        slot->finished = &finished;
 597        while (!finished) {
 598                data_received = 0;
 599                step_active_slots();
 600
 601                if (!data_received && slot->local != NULL) {
 602                        current_pos = ftell(slot->local);
 603                        if (current_pos > last_pos)
 604                                data_received++;
 605                        last_pos = current_pos;
 606                }
 607
 608                if (slot->in_use && !data_received) {
 609                        max_fd = 0;
 610                        FD_ZERO(&readfds);
 611                        FD_ZERO(&writefds);
 612                        FD_ZERO(&excfds);
 613                        select_timeout.tv_sec = 0;
 614                        select_timeout.tv_usec = 50000;
 615                        select(max_fd, &readfds, &writefds,
 616                               &excfds, &select_timeout);
 617                }
 618        }
 619#else
 620        while (slot->in_use) {
 621                slot->curl_result = curl_easy_perform(slot->curl);
 622                finish_active_slot(slot);
 623        }
 624#endif
 625}
 626
 627static void closedown_active_slot(struct active_request_slot *slot)
 628{
 629        active_requests--;
 630        slot->in_use = 0;
 631}
 632
 633void release_active_slot(struct active_request_slot *slot)
 634{
 635        closedown_active_slot(slot);
 636        if (slot->curl) {
 637#ifdef USE_CURL_MULTI
 638                curl_multi_remove_handle(curlm, slot->curl);
 639#endif
 640                curl_easy_cleanup(slot->curl);
 641                slot->curl = NULL;
 642        }
 643#ifdef USE_CURL_MULTI
 644        fill_active_slots();
 645#endif
 646}
 647
 648void finish_active_slot(struct active_request_slot *slot)
 649{
 650        closedown_active_slot(slot);
 651        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 652
 653        if (slot->finished != NULL)
 654                (*slot->finished) = 1;
 655
 656        /* Store slot results so they can be read after the slot is reused */
 657        if (slot->results != NULL) {
 658                slot->results->curl_result = slot->curl_result;
 659                slot->results->http_code = slot->http_code;
 660        }
 661
 662        /* Run callback if appropriate */
 663        if (slot->callback_func != NULL)
 664                slot->callback_func(slot->callback_data);
 665}
 666
 667void finish_all_active_slots(void)
 668{
 669        struct active_request_slot *slot = active_queue_head;
 670
 671        while (slot != NULL)
 672                if (slot->in_use) {
 673                        run_active_slot(slot);
 674                        slot = active_queue_head;
 675                } else {
 676                        slot = slot->next;
 677                }
 678}
 679
 680/* Helpers for modifying and creating URLs */
 681static inline int needs_quote(int ch)
 682{
 683        if (((ch >= 'A') && (ch <= 'Z'))
 684                        || ((ch >= 'a') && (ch <= 'z'))
 685                        || ((ch >= '0') && (ch <= '9'))
 686                        || (ch == '/')
 687                        || (ch == '-')
 688                        || (ch == '.'))
 689                return 0;
 690        return 1;
 691}
 692
 693static inline int hex(int v)
 694{
 695        if (v < 10)
 696                return '0' + v;
 697        else
 698                return 'A' + v - 10;
 699}
 700
 701static void end_url_with_slash(struct strbuf *buf, const char *url)
 702{
 703        strbuf_addstr(buf, url);
 704        if (buf->len && buf->buf[buf->len - 1] != '/')
 705                strbuf_addstr(buf, "/");
 706}
 707
 708static char *quote_ref_url(const char *base, const char *ref)
 709{
 710        struct strbuf buf = STRBUF_INIT;
 711        const char *cp;
 712        int ch;
 713
 714        end_url_with_slash(&buf, base);
 715
 716        for (cp = ref; (ch = *cp) != 0; cp++)
 717                if (needs_quote(ch))
 718                        strbuf_addf(&buf, "%%%02x", ch);
 719                else
 720                        strbuf_addch(&buf, *cp);
 721
 722        return strbuf_detach(&buf, NULL);
 723}
 724
 725void append_remote_object_url(struct strbuf *buf, const char *url,
 726                              const char *hex,
 727                              int only_two_digit_prefix)
 728{
 729        end_url_with_slash(buf, url);
 730
 731        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 732        if (!only_two_digit_prefix)
 733                strbuf_addf(buf, "%s", hex+2);
 734}
 735
 736char *get_remote_object_url(const char *url, const char *hex,
 737                            int only_two_digit_prefix)
 738{
 739        struct strbuf buf = STRBUF_INIT;
 740        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 741        return strbuf_detach(&buf, NULL);
 742}
 743
 744/* http_request() targets */
 745#define HTTP_REQUEST_STRBUF     0
 746#define HTTP_REQUEST_FILE       1
 747
 748static int http_request(const char *url, void *result, int target, int options)
 749{
 750        struct active_request_slot *slot;
 751        struct slot_results results;
 752        struct curl_slist *headers = NULL;
 753        struct strbuf buf = STRBUF_INIT;
 754        int ret;
 755
 756        slot = get_active_slot();
 757        slot->results = &results;
 758        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 759
 760        if (result == NULL) {
 761                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 762        } else {
 763                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 764                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 765
 766                if (target == HTTP_REQUEST_FILE) {
 767                        long posn = ftell(result);
 768                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 769                                         fwrite);
 770                        if (posn > 0) {
 771                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 772                                headers = curl_slist_append(headers, buf.buf);
 773                                strbuf_reset(&buf);
 774                        }
 775                        slot->local = result;
 776                } else
 777                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 778                                         fwrite_buffer);
 779        }
 780
 781        strbuf_addstr(&buf, "Pragma:");
 782        if (options & HTTP_NO_CACHE)
 783                strbuf_addstr(&buf, " no-cache");
 784
 785        headers = curl_slist_append(headers, buf.buf);
 786
 787        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 788        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 789
 790        if (start_active_slot(slot)) {
 791                run_active_slot(slot);
 792                if (results.curl_result == CURLE_OK)
 793                        ret = HTTP_OK;
 794                else if (missing_target(&results))
 795                        ret = HTTP_MISSING_TARGET;
 796                else
 797                        ret = HTTP_ERROR;
 798        } else {
 799                error("Unable to start HTTP request for %s", url);
 800                ret = HTTP_START_FAILED;
 801        }
 802
 803        slot->local = NULL;
 804        curl_slist_free_all(headers);
 805        strbuf_release(&buf);
 806
 807        return ret;
 808}
 809
 810int http_get_strbuf(const char *url, struct strbuf *result, int options)
 811{
 812        return http_request(url, result, HTTP_REQUEST_STRBUF, options);
 813}
 814
 815int http_get_file(const char *url, const char *filename, int options)
 816{
 817        int ret;
 818        struct strbuf tmpfile = STRBUF_INIT;
 819        FILE *result;
 820
 821        strbuf_addf(&tmpfile, "%s.temp", filename);
 822        result = fopen(tmpfile.buf, "a");
 823        if (! result) {
 824                error("Unable to open local file %s", tmpfile.buf);
 825                ret = HTTP_ERROR;
 826                goto cleanup;
 827        }
 828
 829        ret = http_request(url, result, HTTP_REQUEST_FILE, options);
 830        fclose(result);
 831
 832        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 833                ret = HTTP_ERROR;
 834cleanup:
 835        strbuf_release(&tmpfile);
 836        return ret;
 837}
 838
 839int http_error(const char *url, int ret)
 840{
 841        /* http_request has already handled HTTP_START_FAILED. */
 842        if (ret != HTTP_START_FAILED)
 843                error("%s while accessing %s\n", curl_errorstr, url);
 844
 845        return ret;
 846}
 847
 848int http_fetch_ref(const char *base, struct ref *ref)
 849{
 850        char *url;
 851        struct strbuf buffer = STRBUF_INIT;
 852        int ret = -1;
 853
 854        url = quote_ref_url(base, ref->name);
 855        if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 856                strbuf_rtrim(&buffer);
 857                if (buffer.len == 40)
 858                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 859                else if (!prefixcmp(buffer.buf, "ref: ")) {
 860                        ref->symref = xstrdup(buffer.buf + 5);
 861                        ret = 0;
 862                }
 863        }
 864
 865        strbuf_release(&buffer);
 866        free(url);
 867        return ret;
 868}
 869
 870/* Helpers for fetching packs */
 871static int fetch_pack_index(unsigned char *sha1, const char *base_url)
 872{
 873        int ret = 0;
 874        char *hex = xstrdup(sha1_to_hex(sha1));
 875        char *filename;
 876        char *url = NULL;
 877        struct strbuf buf = STRBUF_INIT;
 878
 879        if (has_pack_index(sha1)) {
 880                ret = 0;
 881                goto cleanup;
 882        }
 883
 884        if (http_is_verbose)
 885                fprintf(stderr, "Getting index for pack %s\n", hex);
 886
 887        end_url_with_slash(&buf, base_url);
 888        strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
 889        url = strbuf_detach(&buf, NULL);
 890
 891        filename = sha1_pack_index_name(sha1);
 892        if (http_get_file(url, filename, 0) != HTTP_OK)
 893                ret = error("Unable to get pack index %s\n", url);
 894
 895cleanup:
 896        free(hex);
 897        free(url);
 898        return ret;
 899}
 900
 901static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 902        unsigned char *sha1, const char *base_url)
 903{
 904        struct packed_git *new_pack;
 905
 906        if (fetch_pack_index(sha1, base_url))
 907                return -1;
 908
 909        new_pack = parse_pack_index(sha1);
 910        if (!new_pack)
 911                return -1; /* parse_pack_index() already issued error message */
 912        new_pack->next = *packs_head;
 913        *packs_head = new_pack;
 914        return 0;
 915}
 916
 917int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 918{
 919        int ret = 0, i = 0;
 920        char *url, *data;
 921        struct strbuf buf = STRBUF_INIT;
 922        unsigned char sha1[20];
 923
 924        end_url_with_slash(&buf, base_url);
 925        strbuf_addstr(&buf, "objects/info/packs");
 926        url = strbuf_detach(&buf, NULL);
 927
 928        ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 929        if (ret != HTTP_OK)
 930                goto cleanup;
 931
 932        data = buf.buf;
 933        while (i < buf.len) {
 934                switch (data[i]) {
 935                case 'P':
 936                        i++;
 937                        if (i + 52 <= buf.len &&
 938                            !prefixcmp(data + i, " pack-") &&
 939                            !prefixcmp(data + i + 46, ".pack\n")) {
 940                                get_sha1_hex(data + i + 6, sha1);
 941                                fetch_and_setup_pack_index(packs_head, sha1,
 942                                                      base_url);
 943                                i += 51;
 944                                break;
 945                        }
 946                default:
 947                        while (i < buf.len && data[i] != '\n')
 948                                i++;
 949                }
 950                i++;
 951        }
 952
 953cleanup:
 954        free(url);
 955        return ret;
 956}
 957
 958void release_http_pack_request(struct http_pack_request *preq)
 959{
 960        if (preq->packfile != NULL) {
 961                fclose(preq->packfile);
 962                preq->packfile = NULL;
 963                preq->slot->local = NULL;
 964        }
 965        if (preq->range_header != NULL) {
 966                curl_slist_free_all(preq->range_header);
 967                preq->range_header = NULL;
 968        }
 969        preq->slot = NULL;
 970        free(preq->url);
 971}
 972
 973int finish_http_pack_request(struct http_pack_request *preq)
 974{
 975        int ret;
 976        struct packed_git **lst;
 977
 978        preq->target->pack_size = ftell(preq->packfile);
 979
 980        if (preq->packfile != NULL) {
 981                fclose(preq->packfile);
 982                preq->packfile = NULL;
 983                preq->slot->local = NULL;
 984        }
 985
 986        ret = move_temp_to_file(preq->tmpfile, preq->filename);
 987        if (ret)
 988                return ret;
 989
 990        lst = preq->lst;
 991        while (*lst != preq->target)
 992                lst = &((*lst)->next);
 993        *lst = (*lst)->next;
 994
 995        if (verify_pack(preq->target))
 996                return -1;
 997        install_packed_git(preq->target);
 998
 999        return 0;
1000}
1001
1002struct http_pack_request *new_http_pack_request(
1003        struct packed_git *target, const char *base_url)
1004{
1005        char *filename;
1006        long prev_posn = 0;
1007        char range[RANGE_HEADER_SIZE];
1008        struct strbuf buf = STRBUF_INIT;
1009        struct http_pack_request *preq;
1010
1011        preq = xmalloc(sizeof(*preq));
1012        preq->target = target;
1013        preq->range_header = NULL;
1014
1015        end_url_with_slash(&buf, base_url);
1016        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1017                sha1_to_hex(target->sha1));
1018        preq->url = strbuf_detach(&buf, NULL);
1019
1020        filename = sha1_pack_name(target->sha1);
1021        snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
1022        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
1023        preq->packfile = fopen(preq->tmpfile, "a");
1024        if (!preq->packfile) {
1025                error("Unable to open local file %s for pack",
1026                      preq->tmpfile);
1027                goto abort;
1028        }
1029
1030        preq->slot = get_active_slot();
1031        preq->slot->local = preq->packfile;
1032        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1033        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1034        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1035        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1036                no_pragma_header);
1037
1038        /*
1039         * If there is data present from a previous transfer attempt,
1040         * resume where it left off
1041         */
1042        prev_posn = ftell(preq->packfile);
1043        if (prev_posn>0) {
1044                if (http_is_verbose)
1045                        fprintf(stderr,
1046                                "Resuming fetch of pack %s at byte %ld\n",
1047                                sha1_to_hex(target->sha1), prev_posn);
1048                sprintf(range, "Range: bytes=%ld-", prev_posn);
1049                preq->range_header = curl_slist_append(NULL, range);
1050                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1051                        preq->range_header);
1052        }
1053
1054        return preq;
1055
1056abort:
1057        free(filename);
1058        free(preq->url);
1059        free(preq);
1060        return NULL;
1061}
1062
1063/* Helpers for fetching objects (loose) */
1064static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1065                               void *data)
1066{
1067        unsigned char expn[4096];
1068        size_t size = eltsize * nmemb;
1069        int posn = 0;
1070        struct http_object_request *freq =
1071                (struct http_object_request *)data;
1072        do {
1073                ssize_t retval = xwrite(freq->localfile,
1074                                        (char *) ptr + posn, size - posn);
1075                if (retval < 0)
1076                        return posn;
1077                posn += retval;
1078        } while (posn < size);
1079
1080        freq->stream.avail_in = size;
1081        freq->stream.next_in = ptr;
1082        do {
1083                freq->stream.next_out = expn;
1084                freq->stream.avail_out = sizeof(expn);
1085                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1086                git_SHA1_Update(&freq->c, expn,
1087                                sizeof(expn) - freq->stream.avail_out);
1088        } while (freq->stream.avail_in && freq->zret == Z_OK);
1089        data_received++;
1090        return size;
1091}
1092
1093struct http_object_request *new_http_object_request(const char *base_url,
1094        unsigned char *sha1)
1095{
1096        char *hex = sha1_to_hex(sha1);
1097        char *filename;
1098        char prevfile[PATH_MAX];
1099        int prevlocal;
1100        unsigned char prev_buf[PREV_BUF_SIZE];
1101        ssize_t prev_read = 0;
1102        long prev_posn = 0;
1103        char range[RANGE_HEADER_SIZE];
1104        struct curl_slist *range_header = NULL;
1105        struct http_object_request *freq;
1106
1107        freq = xmalloc(sizeof(*freq));
1108        hashcpy(freq->sha1, sha1);
1109        freq->localfile = -1;
1110
1111        filename = sha1_file_name(sha1);
1112        snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
1113        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1114                 "%s.temp", filename);
1115
1116        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1117        unlink_or_warn(prevfile);
1118        rename(freq->tmpfile, prevfile);
1119        unlink_or_warn(freq->tmpfile);
1120
1121        if (freq->localfile != -1)
1122                error("fd leakage in start: %d", freq->localfile);
1123        freq->localfile = open(freq->tmpfile,
1124                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1125        /*
1126         * This could have failed due to the "lazy directory creation";
1127         * try to mkdir the last path component.
1128         */
1129        if (freq->localfile < 0 && errno == ENOENT) {
1130                char *dir = strrchr(freq->tmpfile, '/');
1131                if (dir) {
1132                        *dir = 0;
1133                        mkdir(freq->tmpfile, 0777);
1134                        *dir = '/';
1135                }
1136                freq->localfile = open(freq->tmpfile,
1137                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1138        }
1139
1140        if (freq->localfile < 0) {
1141                error("Couldn't create temporary file %s for %s: %s",
1142                      freq->tmpfile, freq->filename, strerror(errno));
1143                goto abort;
1144        }
1145
1146        memset(&freq->stream, 0, sizeof(freq->stream));
1147
1148        git_inflate_init(&freq->stream);
1149
1150        git_SHA1_Init(&freq->c);
1151
1152        freq->url = get_remote_object_url(base_url, hex, 0);
1153
1154        /*
1155         * If a previous temp file is present, process what was already
1156         * fetched.
1157         */
1158        prevlocal = open(prevfile, O_RDONLY);
1159        if (prevlocal != -1) {
1160                do {
1161                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1162                        if (prev_read>0) {
1163                                if (fwrite_sha1_file(prev_buf,
1164                                                     1,
1165                                                     prev_read,
1166                                                     freq) == prev_read) {
1167                                        prev_posn += prev_read;
1168                                } else {
1169                                        prev_read = -1;
1170                                }
1171                        }
1172                } while (prev_read > 0);
1173                close(prevlocal);
1174        }
1175        unlink_or_warn(prevfile);
1176
1177        /*
1178         * Reset inflate/SHA1 if there was an error reading the previous temp
1179         * file; also rewind to the beginning of the local file.
1180         */
1181        if (prev_read == -1) {
1182                memset(&freq->stream, 0, sizeof(freq->stream));
1183                git_inflate_init(&freq->stream);
1184                git_SHA1_Init(&freq->c);
1185                if (prev_posn>0) {
1186                        prev_posn = 0;
1187                        lseek(freq->localfile, 0, SEEK_SET);
1188                        if (ftruncate(freq->localfile, 0) < 0) {
1189                                error("Couldn't truncate temporary file %s for %s: %s",
1190                                          freq->tmpfile, freq->filename, strerror(errno));
1191                                goto abort;
1192                        }
1193                }
1194        }
1195
1196        freq->slot = get_active_slot();
1197
1198        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1199        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1200        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1201        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1202        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1203
1204        /*
1205         * If we have successfully processed data from a previous fetch
1206         * attempt, only fetch the data we don't already have.
1207         */
1208        if (prev_posn>0) {
1209                if (http_is_verbose)
1210                        fprintf(stderr,
1211                                "Resuming fetch of object %s at byte %ld\n",
1212                                hex, prev_posn);
1213                sprintf(range, "Range: bytes=%ld-", prev_posn);
1214                range_header = curl_slist_append(range_header, range);
1215                curl_easy_setopt(freq->slot->curl,
1216                                 CURLOPT_HTTPHEADER, range_header);
1217        }
1218
1219        return freq;
1220
1221abort:
1222        free(filename);
1223        free(freq->url);
1224        free(freq);
1225        return NULL;
1226}
1227
1228void process_http_object_request(struct http_object_request *freq)
1229{
1230        if (freq->slot == NULL)
1231                return;
1232        freq->curl_result = freq->slot->curl_result;
1233        freq->http_code = freq->slot->http_code;
1234        freq->slot = NULL;
1235}
1236
1237int finish_http_object_request(struct http_object_request *freq)
1238{
1239        struct stat st;
1240
1241        close(freq->localfile);
1242        freq->localfile = -1;
1243
1244        process_http_object_request(freq);
1245
1246        if (freq->http_code == 416) {
1247                warning("requested range invalid; we may already have all the data.");
1248        } else if (freq->curl_result != CURLE_OK) {
1249                if (stat(freq->tmpfile, &st) == 0)
1250                        if (st.st_size == 0)
1251                                unlink_or_warn(freq->tmpfile);
1252                return -1;
1253        }
1254
1255        git_inflate_end(&freq->stream);
1256        git_SHA1_Final(freq->real_sha1, &freq->c);
1257        if (freq->zret != Z_STREAM_END) {
1258                unlink_or_warn(freq->tmpfile);
1259                return -1;
1260        }
1261        if (hashcmp(freq->sha1, freq->real_sha1)) {
1262                unlink_or_warn(freq->tmpfile);
1263                return -1;
1264        }
1265        freq->rename =
1266                move_temp_to_file(freq->tmpfile, freq->filename);
1267
1268        return freq->rename;
1269}
1270
1271void abort_http_object_request(struct http_object_request *freq)
1272{
1273        unlink_or_warn(freq->tmpfile);
1274
1275        release_http_object_request(freq);
1276}
1277
1278void release_http_object_request(struct http_object_request *freq)
1279{
1280        if (freq->localfile != -1) {
1281                close(freq->localfile);
1282                freq->localfile = -1;
1283        }
1284        if (freq->url != NULL) {
1285                free(freq->url);
1286                freq->url = NULL;
1287        }
1288        if (freq->slot != NULL) {
1289                freq->slot->callback_func = NULL;
1290                freq->slot->callback_data = NULL;
1291                release_active_slot(freq->slot);
1292                freq->slot = NULL;
1293        }
1294}