Andrew's git / gitweb.git / http.c
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http.con commit http: clear POSTFIELDS when initializing a slot (1e41827)
   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_POSTFIELDS, NULL);
 498        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 499        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 500
 501        return slot;
 502}
 503
 504int start_active_slot(struct active_request_slot *slot)
 505{
 506#ifdef USE_CURL_MULTI
 507        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 508        int num_transfers;
 509
 510        if (curlm_result != CURLM_OK &&
 511            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 512                active_requests--;
 513                slot->in_use = 0;
 514                return 0;
 515        }
 516
 517        /*
 518         * We know there must be something to do, since we just added
 519         * something.
 520         */
 521        curl_multi_perform(curlm, &num_transfers);
 522#endif
 523        return 1;
 524}
 525
 526#ifdef USE_CURL_MULTI
 527struct fill_chain {
 528        void *data;
 529        int (*fill)(void *);
 530        struct fill_chain *next;
 531};
 532
 533static struct fill_chain *fill_cfg;
 534
 535void add_fill_function(void *data, int (*fill)(void *))
 536{
 537        struct fill_chain *new = xmalloc(sizeof(*new));
 538        struct fill_chain **linkp = &fill_cfg;
 539        new->data = data;
 540        new->fill = fill;
 541        new->next = NULL;
 542        while (*linkp)
 543                linkp = &(*linkp)->next;
 544        *linkp = new;
 545}
 546
 547void fill_active_slots(void)
 548{
 549        struct active_request_slot *slot = active_queue_head;
 550
 551        while (active_requests < max_requests) {
 552                struct fill_chain *fill;
 553                for (fill = fill_cfg; fill; fill = fill->next)
 554                        if (fill->fill(fill->data))
 555                                break;
 556
 557                if (!fill)
 558                        break;
 559        }
 560
 561        while (slot != NULL) {
 562                if (!slot->in_use && slot->curl != NULL) {
 563                        curl_easy_cleanup(slot->curl);
 564                        slot->curl = NULL;
 565                }
 566                slot = slot->next;
 567        }
 568}
 569
 570void step_active_slots(void)
 571{
 572        int num_transfers;
 573        CURLMcode curlm_result;
 574
 575        do {
 576                curlm_result = curl_multi_perform(curlm, &num_transfers);
 577        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 578        if (num_transfers < active_requests) {
 579                process_curl_messages();
 580                fill_active_slots();
 581        }
 582}
 583#endif
 584
 585void run_active_slot(struct active_request_slot *slot)
 586{
 587#ifdef USE_CURL_MULTI
 588        long last_pos = 0;
 589        long current_pos;
 590        fd_set readfds;
 591        fd_set writefds;
 592        fd_set excfds;
 593        int max_fd;
 594        struct timeval select_timeout;
 595        int finished = 0;
 596
 597        slot->finished = &finished;
 598        while (!finished) {
 599                data_received = 0;
 600                step_active_slots();
 601
 602                if (!data_received && slot->local != NULL) {
 603                        current_pos = ftell(slot->local);
 604                        if (current_pos > last_pos)
 605                                data_received++;
 606                        last_pos = current_pos;
 607                }
 608
 609                if (slot->in_use && !data_received) {
 610                        max_fd = 0;
 611                        FD_ZERO(&readfds);
 612                        FD_ZERO(&writefds);
 613                        FD_ZERO(&excfds);
 614                        select_timeout.tv_sec = 0;
 615                        select_timeout.tv_usec = 50000;
 616                        select(max_fd, &readfds, &writefds,
 617                               &excfds, &select_timeout);
 618                }
 619        }
 620#else
 621        while (slot->in_use) {
 622                slot->curl_result = curl_easy_perform(slot->curl);
 623                finish_active_slot(slot);
 624        }
 625#endif
 626}
 627
 628static void closedown_active_slot(struct active_request_slot *slot)
 629{
 630        active_requests--;
 631        slot->in_use = 0;
 632}
 633
 634void release_active_slot(struct active_request_slot *slot)
 635{
 636        closedown_active_slot(slot);
 637        if (slot->curl) {
 638#ifdef USE_CURL_MULTI
 639                curl_multi_remove_handle(curlm, slot->curl);
 640#endif
 641                curl_easy_cleanup(slot->curl);
 642                slot->curl = NULL;
 643        }
 644#ifdef USE_CURL_MULTI
 645        fill_active_slots();
 646#endif
 647}
 648
 649void finish_active_slot(struct active_request_slot *slot)
 650{
 651        closedown_active_slot(slot);
 652        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 653
 654        if (slot->finished != NULL)
 655                (*slot->finished) = 1;
 656
 657        /* Store slot results so they can be read after the slot is reused */
 658        if (slot->results != NULL) {
 659                slot->results->curl_result = slot->curl_result;
 660                slot->results->http_code = slot->http_code;
 661        }
 662
 663        /* Run callback if appropriate */
 664        if (slot->callback_func != NULL)
 665                slot->callback_func(slot->callback_data);
 666}
 667
 668void finish_all_active_slots(void)
 669{
 670        struct active_request_slot *slot = active_queue_head;
 671
 672        while (slot != NULL)
 673                if (slot->in_use) {
 674                        run_active_slot(slot);
 675                        slot = active_queue_head;
 676                } else {
 677                        slot = slot->next;
 678                }
 679}
 680
 681/* Helpers for modifying and creating URLs */
 682static inline int needs_quote(int ch)
 683{
 684        if (((ch >= 'A') && (ch <= 'Z'))
 685                        || ((ch >= 'a') && (ch <= 'z'))
 686                        || ((ch >= '0') && (ch <= '9'))
 687                        || (ch == '/')
 688                        || (ch == '-')
 689                        || (ch == '.'))
 690                return 0;
 691        return 1;
 692}
 693
 694static inline int hex(int v)
 695{
 696        if (v < 10)
 697                return '0' + v;
 698        else
 699                return 'A' + v - 10;
 700}
 701
 702static void end_url_with_slash(struct strbuf *buf, const char *url)
 703{
 704        strbuf_addstr(buf, url);
 705        if (buf->len && buf->buf[buf->len - 1] != '/')
 706                strbuf_addstr(buf, "/");
 707}
 708
 709static char *quote_ref_url(const char *base, const char *ref)
 710{
 711        struct strbuf buf = STRBUF_INIT;
 712        const char *cp;
 713        int ch;
 714
 715        end_url_with_slash(&buf, base);
 716
 717        for (cp = ref; (ch = *cp) != 0; cp++)
 718                if (needs_quote(ch))
 719                        strbuf_addf(&buf, "%%%02x", ch);
 720                else
 721                        strbuf_addch(&buf, *cp);
 722
 723        return strbuf_detach(&buf, NULL);
 724}
 725
 726void append_remote_object_url(struct strbuf *buf, const char *url,
 727                              const char *hex,
 728                              int only_two_digit_prefix)
 729{
 730        end_url_with_slash(buf, url);
 731
 732        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 733        if (!only_two_digit_prefix)
 734                strbuf_addf(buf, "%s", hex+2);
 735}
 736
 737char *get_remote_object_url(const char *url, const char *hex,
 738                            int only_two_digit_prefix)
 739{
 740        struct strbuf buf = STRBUF_INIT;
 741        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 742        return strbuf_detach(&buf, NULL);
 743}
 744
 745/* http_request() targets */
 746#define HTTP_REQUEST_STRBUF     0
 747#define HTTP_REQUEST_FILE       1
 748
 749static int http_request(const char *url, void *result, int target, int options)
 750{
 751        struct active_request_slot *slot;
 752        struct slot_results results;
 753        struct curl_slist *headers = NULL;
 754        struct strbuf buf = STRBUF_INIT;
 755        int ret;
 756
 757        slot = get_active_slot();
 758        slot->results = &results;
 759        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 760
 761        if (result == NULL) {
 762                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 763        } else {
 764                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 765                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 766
 767                if (target == HTTP_REQUEST_FILE) {
 768                        long posn = ftell(result);
 769                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 770                                         fwrite);
 771                        if (posn > 0) {
 772                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 773                                headers = curl_slist_append(headers, buf.buf);
 774                                strbuf_reset(&buf);
 775                        }
 776                        slot->local = result;
 777                } else
 778                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 779                                         fwrite_buffer);
 780        }
 781
 782        strbuf_addstr(&buf, "Pragma:");
 783        if (options & HTTP_NO_CACHE)
 784                strbuf_addstr(&buf, " no-cache");
 785
 786        headers = curl_slist_append(headers, buf.buf);
 787
 788        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 789        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 790
 791        if (start_active_slot(slot)) {
 792                run_active_slot(slot);
 793                if (results.curl_result == CURLE_OK)
 794                        ret = HTTP_OK;
 795                else if (missing_target(&results))
 796                        ret = HTTP_MISSING_TARGET;
 797                else
 798                        ret = HTTP_ERROR;
 799        } else {
 800                error("Unable to start HTTP request for %s", url);
 801                ret = HTTP_START_FAILED;
 802        }
 803
 804        slot->local = NULL;
 805        curl_slist_free_all(headers);
 806        strbuf_release(&buf);
 807
 808        return ret;
 809}
 810
 811int http_get_strbuf(const char *url, struct strbuf *result, int options)
 812{
 813        return http_request(url, result, HTTP_REQUEST_STRBUF, options);
 814}
 815
 816int http_get_file(const char *url, const char *filename, int options)
 817{
 818        int ret;
 819        struct strbuf tmpfile = STRBUF_INIT;
 820        FILE *result;
 821
 822        strbuf_addf(&tmpfile, "%s.temp", filename);
 823        result = fopen(tmpfile.buf, "a");
 824        if (! result) {
 825                error("Unable to open local file %s", tmpfile.buf);
 826                ret = HTTP_ERROR;
 827                goto cleanup;
 828        }
 829
 830        ret = http_request(url, result, HTTP_REQUEST_FILE, options);
 831        fclose(result);
 832
 833        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 834                ret = HTTP_ERROR;
 835cleanup:
 836        strbuf_release(&tmpfile);
 837        return ret;
 838}
 839
 840int http_error(const char *url, int ret)
 841{
 842        /* http_request has already handled HTTP_START_FAILED. */
 843        if (ret != HTTP_START_FAILED)
 844                error("%s while accessing %s\n", curl_errorstr, url);
 845
 846        return ret;
 847}
 848
 849int http_fetch_ref(const char *base, struct ref *ref)
 850{
 851        char *url;
 852        struct strbuf buffer = STRBUF_INIT;
 853        int ret = -1;
 854
 855        url = quote_ref_url(base, ref->name);
 856        if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 857                strbuf_rtrim(&buffer);
 858                if (buffer.len == 40)
 859                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 860                else if (!prefixcmp(buffer.buf, "ref: ")) {
 861                        ref->symref = xstrdup(buffer.buf + 5);
 862                        ret = 0;
 863                }
 864        }
 865
 866        strbuf_release(&buffer);
 867        free(url);
 868        return ret;
 869}
 870
 871/* Helpers for fetching packs */
 872static int fetch_pack_index(unsigned char *sha1, const char *base_url)
 873{
 874        int ret = 0;
 875        char *hex = xstrdup(sha1_to_hex(sha1));
 876        char *filename;
 877        char *url = NULL;
 878        struct strbuf buf = STRBUF_INIT;
 879
 880        if (has_pack_index(sha1)) {
 881                ret = 0;
 882                goto cleanup;
 883        }
 884
 885        if (http_is_verbose)
 886                fprintf(stderr, "Getting index for pack %s\n", hex);
 887
 888        end_url_with_slash(&buf, base_url);
 889        strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
 890        url = strbuf_detach(&buf, NULL);
 891
 892        filename = sha1_pack_index_name(sha1);
 893        if (http_get_file(url, filename, 0) != HTTP_OK)
 894                ret = error("Unable to get pack index %s\n", url);
 895
 896cleanup:
 897        free(hex);
 898        free(url);
 899        return ret;
 900}
 901
 902static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 903        unsigned char *sha1, const char *base_url)
 904{
 905        struct packed_git *new_pack;
 906
 907        if (fetch_pack_index(sha1, base_url))
 908                return -1;
 909
 910        new_pack = parse_pack_index(sha1);
 911        if (!new_pack)
 912                return -1; /* parse_pack_index() already issued error message */
 913        new_pack->next = *packs_head;
 914        *packs_head = new_pack;
 915        return 0;
 916}
 917
 918int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 919{
 920        int ret = 0, i = 0;
 921        char *url, *data;
 922        struct strbuf buf = STRBUF_INIT;
 923        unsigned char sha1[20];
 924
 925        end_url_with_slash(&buf, base_url);
 926        strbuf_addstr(&buf, "objects/info/packs");
 927        url = strbuf_detach(&buf, NULL);
 928
 929        ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 930        if (ret != HTTP_OK)
 931                goto cleanup;
 932
 933        data = buf.buf;
 934        while (i < buf.len) {
 935                switch (data[i]) {
 936                case 'P':
 937                        i++;
 938                        if (i + 52 <= buf.len &&
 939                            !prefixcmp(data + i, " pack-") &&
 940                            !prefixcmp(data + i + 46, ".pack\n")) {
 941                                get_sha1_hex(data + i + 6, sha1);
 942                                fetch_and_setup_pack_index(packs_head, sha1,
 943                                                      base_url);
 944                                i += 51;
 945                                break;
 946                        }
 947                default:
 948                        while (i < buf.len && data[i] != '\n')
 949                                i++;
 950                }
 951                i++;
 952        }
 953
 954cleanup:
 955        free(url);
 956        return ret;
 957}
 958
 959void release_http_pack_request(struct http_pack_request *preq)
 960{
 961        if (preq->packfile != NULL) {
 962                fclose(preq->packfile);
 963                preq->packfile = NULL;
 964                preq->slot->local = NULL;
 965        }
 966        if (preq->range_header != NULL) {
 967                curl_slist_free_all(preq->range_header);
 968                preq->range_header = NULL;
 969        }
 970        preq->slot = NULL;
 971        free(preq->url);
 972}
 973
 974int finish_http_pack_request(struct http_pack_request *preq)
 975{
 976        int ret;
 977        struct packed_git **lst;
 978
 979        preq->target->pack_size = ftell(preq->packfile);
 980
 981        if (preq->packfile != NULL) {
 982                fclose(preq->packfile);
 983                preq->packfile = NULL;
 984                preq->slot->local = NULL;
 985        }
 986
 987        ret = move_temp_to_file(preq->tmpfile, preq->filename);
 988        if (ret)
 989                return ret;
 990
 991        lst = preq->lst;
 992        while (*lst != preq->target)
 993                lst = &((*lst)->next);
 994        *lst = (*lst)->next;
 995
 996        if (verify_pack(preq->target))
 997                return -1;
 998        install_packed_git(preq->target);
 999
1000        return 0;
1001}
1002
1003struct http_pack_request *new_http_pack_request(
1004        struct packed_git *target, const char *base_url)
1005{
1006        char *filename;
1007        long prev_posn = 0;
1008        char range[RANGE_HEADER_SIZE];
1009        struct strbuf buf = STRBUF_INIT;
1010        struct http_pack_request *preq;
1011
1012        preq = xmalloc(sizeof(*preq));
1013        preq->target = target;
1014        preq->range_header = NULL;
1015
1016        end_url_with_slash(&buf, base_url);
1017        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1018                sha1_to_hex(target->sha1));
1019        preq->url = strbuf_detach(&buf, NULL);
1020
1021        filename = sha1_pack_name(target->sha1);
1022        snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
1023        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
1024        preq->packfile = fopen(preq->tmpfile, "a");
1025        if (!preq->packfile) {
1026                error("Unable to open local file %s for pack",
1027                      preq->tmpfile);
1028                goto abort;
1029        }
1030
1031        preq->slot = get_active_slot();
1032        preq->slot->local = preq->packfile;
1033        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1034        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1035        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1036        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1037                no_pragma_header);
1038
1039        /*
1040         * If there is data present from a previous transfer attempt,
1041         * resume where it left off
1042         */
1043        prev_posn = ftell(preq->packfile);
1044        if (prev_posn>0) {
1045                if (http_is_verbose)
1046                        fprintf(stderr,
1047                                "Resuming fetch of pack %s at byte %ld\n",
1048                                sha1_to_hex(target->sha1), prev_posn);
1049                sprintf(range, "Range: bytes=%ld-", prev_posn);
1050                preq->range_header = curl_slist_append(NULL, range);
1051                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1052                        preq->range_header);
1053        }
1054
1055        return preq;
1056
1057abort:
1058        free(filename);
1059        free(preq->url);
1060        free(preq);
1061        return NULL;
1062}
1063
1064/* Helpers for fetching objects (loose) */
1065static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1066                               void *data)
1067{
1068        unsigned char expn[4096];
1069        size_t size = eltsize * nmemb;
1070        int posn = 0;
1071        struct http_object_request *freq =
1072                (struct http_object_request *)data;
1073        do {
1074                ssize_t retval = xwrite(freq->localfile,
1075                                        (char *) ptr + posn, size - posn);
1076                if (retval < 0)
1077                        return posn;
1078                posn += retval;
1079        } while (posn < size);
1080
1081        freq->stream.avail_in = size;
1082        freq->stream.next_in = ptr;
1083        do {
1084                freq->stream.next_out = expn;
1085                freq->stream.avail_out = sizeof(expn);
1086                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1087                git_SHA1_Update(&freq->c, expn,
1088                                sizeof(expn) - freq->stream.avail_out);
1089        } while (freq->stream.avail_in && freq->zret == Z_OK);
1090        data_received++;
1091        return size;
1092}
1093
1094struct http_object_request *new_http_object_request(const char *base_url,
1095        unsigned char *sha1)
1096{
1097        char *hex = sha1_to_hex(sha1);
1098        char *filename;
1099        char prevfile[PATH_MAX];
1100        int prevlocal;
1101        unsigned char prev_buf[PREV_BUF_SIZE];
1102        ssize_t prev_read = 0;
1103        long prev_posn = 0;
1104        char range[RANGE_HEADER_SIZE];
1105        struct curl_slist *range_header = NULL;
1106        struct http_object_request *freq;
1107
1108        freq = xmalloc(sizeof(*freq));
1109        hashcpy(freq->sha1, sha1);
1110        freq->localfile = -1;
1111
1112        filename = sha1_file_name(sha1);
1113        snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
1114        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1115                 "%s.temp", filename);
1116
1117        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1118        unlink_or_warn(prevfile);
1119        rename(freq->tmpfile, prevfile);
1120        unlink_or_warn(freq->tmpfile);
1121
1122        if (freq->localfile != -1)
1123                error("fd leakage in start: %d", freq->localfile);
1124        freq->localfile = open(freq->tmpfile,
1125                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1126        /*
1127         * This could have failed due to the "lazy directory creation";
1128         * try to mkdir the last path component.
1129         */
1130        if (freq->localfile < 0 && errno == ENOENT) {
1131                char *dir = strrchr(freq->tmpfile, '/');
1132                if (dir) {
1133                        *dir = 0;
1134                        mkdir(freq->tmpfile, 0777);
1135                        *dir = '/';
1136                }
1137                freq->localfile = open(freq->tmpfile,
1138                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1139        }
1140
1141        if (freq->localfile < 0) {
1142                error("Couldn't create temporary file %s for %s: %s",
1143                      freq->tmpfile, freq->filename, strerror(errno));
1144                goto abort;
1145        }
1146
1147        memset(&freq->stream, 0, sizeof(freq->stream));
1148
1149        git_inflate_init(&freq->stream);
1150
1151        git_SHA1_Init(&freq->c);
1152
1153        freq->url = get_remote_object_url(base_url, hex, 0);
1154
1155        /*
1156         * If a previous temp file is present, process what was already
1157         * fetched.
1158         */
1159        prevlocal = open(prevfile, O_RDONLY);
1160        if (prevlocal != -1) {
1161                do {
1162                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1163                        if (prev_read>0) {
1164                                if (fwrite_sha1_file(prev_buf,
1165                                                     1,
1166                                                     prev_read,
1167                                                     freq) == prev_read) {
1168                                        prev_posn += prev_read;
1169                                } else {
1170                                        prev_read = -1;
1171                                }
1172                        }
1173                } while (prev_read > 0);
1174                close(prevlocal);
1175        }
1176        unlink_or_warn(prevfile);
1177
1178        /*
1179         * Reset inflate/SHA1 if there was an error reading the previous temp
1180         * file; also rewind to the beginning of the local file.
1181         */
1182        if (prev_read == -1) {
1183                memset(&freq->stream, 0, sizeof(freq->stream));
1184                git_inflate_init(&freq->stream);
1185                git_SHA1_Init(&freq->c);
1186                if (prev_posn>0) {
1187                        prev_posn = 0;
1188                        lseek(freq->localfile, 0, SEEK_SET);
1189                        if (ftruncate(freq->localfile, 0) < 0) {
1190                                error("Couldn't truncate temporary file %s for %s: %s",
1191                                          freq->tmpfile, freq->filename, strerror(errno));
1192                                goto abort;
1193                        }
1194                }
1195        }
1196
1197        freq->slot = get_active_slot();
1198
1199        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1200        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1201        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1202        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1203        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1204
1205        /*
1206         * If we have successfully processed data from a previous fetch
1207         * attempt, only fetch the data we don't already have.
1208         */
1209        if (prev_posn>0) {
1210                if (http_is_verbose)
1211                        fprintf(stderr,
1212                                "Resuming fetch of object %s at byte %ld\n",
1213                                hex, prev_posn);
1214                sprintf(range, "Range: bytes=%ld-", prev_posn);
1215                range_header = curl_slist_append(range_header, range);
1216                curl_easy_setopt(freq->slot->curl,
1217                                 CURLOPT_HTTPHEADER, range_header);
1218        }
1219
1220        return freq;
1221
1222abort:
1223        free(filename);
1224        free(freq->url);
1225        free(freq);
1226        return NULL;
1227}
1228
1229void process_http_object_request(struct http_object_request *freq)
1230{
1231        if (freq->slot == NULL)
1232                return;
1233        freq->curl_result = freq->slot->curl_result;
1234        freq->http_code = freq->slot->http_code;
1235        freq->slot = NULL;
1236}
1237
1238int finish_http_object_request(struct http_object_request *freq)
1239{
1240        struct stat st;
1241
1242        close(freq->localfile);
1243        freq->localfile = -1;
1244
1245        process_http_object_request(freq);
1246
1247        if (freq->http_code == 416) {
1248                fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
1249        } else if (freq->curl_result != CURLE_OK) {
1250                if (stat(freq->tmpfile, &st) == 0)
1251                        if (st.st_size == 0)
1252                                unlink_or_warn(freq->tmpfile);
1253                return -1;
1254        }
1255
1256        git_inflate_end(&freq->stream);
1257        git_SHA1_Final(freq->real_sha1, &freq->c);
1258        if (freq->zret != Z_STREAM_END) {
1259                unlink_or_warn(freq->tmpfile);
1260                return -1;
1261        }
1262        if (hashcmp(freq->sha1, freq->real_sha1)) {
1263                unlink_or_warn(freq->tmpfile);
1264                return -1;
1265        }
1266        freq->rename =
1267                move_temp_to_file(freq->tmpfile, freq->filename);
1268
1269        return freq->rename;
1270}
1271
1272void abort_http_object_request(struct http_object_request *freq)
1273{
1274        unlink_or_warn(freq->tmpfile);
1275
1276        release_http_object_request(freq);
1277}
1278
1279void release_http_object_request(struct http_object_request *freq)
1280{
1281        if (freq->localfile != -1) {
1282                close(freq->localfile);
1283                freq->localfile = -1;
1284        }
1285        if (freq->url != NULL) {
1286                free(freq->url);
1287                freq->url = NULL;
1288        }
1289        if (freq->slot != NULL) {
1290                freq->slot->callback_func = NULL;
1291                freq->slot->callback_data = NULL;
1292                release_active_slot(freq->slot);
1293                freq->slot = NULL;
1294        }
1295}