Andrew's git / gitweb.git / http.c
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http.con commit shift end_url_with_slash() from http.[ch] to url.[ch] (1966d9f)
   1#include "http.h"
   2#include "pack.h"
   3#include "sideband.h"
   4#include "run-command.h"
   5#include "url.h"
   6
   7int data_received;
   8int active_requests;
   9int http_is_verbose;
  10size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  11
  12#if LIBCURL_VERSION_NUM >= 0x070a06
  13#define LIBCURL_CAN_HANDLE_AUTH_ANY
  14#endif
  15
  16static int min_curl_sessions = 1;
  17static int curl_session_count;
  18#ifdef USE_CURL_MULTI
  19static int max_requests = -1;
  20static CURLM *curlm;
  21#endif
  22#ifndef NO_CURL_EASY_DUPHANDLE
  23static CURL *curl_default;
  24#endif
  25
  26#define PREV_BUF_SIZE 4096
  27#define RANGE_HEADER_SIZE 30
  28
  29char curl_errorstr[CURL_ERROR_SIZE];
  30
  31static int curl_ssl_verify = -1;
  32static const char *ssl_cert;
  33#if LIBCURL_VERSION_NUM >= 0x070903
  34static const char *ssl_key;
  35#endif
  36#if LIBCURL_VERSION_NUM >= 0x070908
  37static const char *ssl_capath;
  38#endif
  39static const char *ssl_cainfo;
  40static long curl_low_speed_limit = -1;
  41static long curl_low_speed_time = -1;
  42static int curl_ftp_no_epsv;
  43static const char *curl_http_proxy;
  44static char *user_name, *user_pass;
  45static const char *user_agent;
  46
  47#if LIBCURL_VERSION_NUM >= 0x071700
  48/* Use CURLOPT_KEYPASSWD as is */
  49#elif LIBCURL_VERSION_NUM >= 0x070903
  50#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  51#else
  52#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  53#endif
  54
  55static char *ssl_cert_password;
  56static int ssl_cert_password_required;
  57
  58static struct curl_slist *pragma_header;
  59static struct curl_slist *no_pragma_header;
  60
  61static struct active_request_slot *active_queue_head;
  62
  63size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  64{
  65        size_t size = eltsize * nmemb;
  66        struct buffer *buffer = buffer_;
  67
  68        if (size > buffer->buf.len - buffer->posn)
  69                size = buffer->buf.len - buffer->posn;
  70        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  71        buffer->posn += size;
  72
  73        return size;
  74}
  75
  76#ifndef NO_CURL_IOCTL
  77curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  78{
  79        struct buffer *buffer = clientp;
  80
  81        switch (cmd) {
  82        case CURLIOCMD_NOP:
  83                return CURLIOE_OK;
  84
  85        case CURLIOCMD_RESTARTREAD:
  86                buffer->posn = 0;
  87                return CURLIOE_OK;
  88
  89        default:
  90                return CURLIOE_UNKNOWNCMD;
  91        }
  92}
  93#endif
  94
  95size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  96{
  97        size_t size = eltsize * nmemb;
  98        struct strbuf *buffer = buffer_;
  99
 100        strbuf_add(buffer, ptr, size);
 101        data_received++;
 102        return size;
 103}
 104
 105size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 106{
 107        data_received++;
 108        return eltsize * nmemb;
 109}
 110
 111#ifdef USE_CURL_MULTI
 112static void process_curl_messages(void)
 113{
 114        int num_messages;
 115        struct active_request_slot *slot;
 116        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 117
 118        while (curl_message != NULL) {
 119                if (curl_message->msg == CURLMSG_DONE) {
 120                        int curl_result = curl_message->data.result;
 121                        slot = active_queue_head;
 122                        while (slot != NULL &&
 123                               slot->curl != curl_message->easy_handle)
 124                                slot = slot->next;
 125                        if (slot != NULL) {
 126                                curl_multi_remove_handle(curlm, slot->curl);
 127                                slot->curl_result = curl_result;
 128                                finish_active_slot(slot);
 129                        } else {
 130                                fprintf(stderr, "Received DONE message for unknown request!\n");
 131                        }
 132                } else {
 133                        fprintf(stderr, "Unknown CURL message received: %d\n",
 134                                (int)curl_message->msg);
 135                }
 136                curl_message = curl_multi_info_read(curlm, &num_messages);
 137        }
 138}
 139#endif
 140
 141static int http_options(const char *var, const char *value, void *cb)
 142{
 143        if (!strcmp("http.sslverify", var)) {
 144                curl_ssl_verify = git_config_bool(var, value);
 145                return 0;
 146        }
 147        if (!strcmp("http.sslcert", var))
 148                return git_config_string(&ssl_cert, var, value);
 149#if LIBCURL_VERSION_NUM >= 0x070903
 150        if (!strcmp("http.sslkey", var))
 151                return git_config_string(&ssl_key, var, value);
 152#endif
 153#if LIBCURL_VERSION_NUM >= 0x070908
 154        if (!strcmp("http.sslcapath", var))
 155                return git_config_string(&ssl_capath, var, value);
 156#endif
 157        if (!strcmp("http.sslcainfo", var))
 158                return git_config_string(&ssl_cainfo, var, value);
 159        if (!strcmp("http.sslcertpasswordprotected", var)) {
 160                if (git_config_bool(var, value))
 161                        ssl_cert_password_required = 1;
 162                return 0;
 163        }
 164        if (!strcmp("http.minsessions", var)) {
 165                min_curl_sessions = git_config_int(var, value);
 166#ifndef USE_CURL_MULTI
 167                if (min_curl_sessions > 1)
 168                        min_curl_sessions = 1;
 169#endif
 170                return 0;
 171        }
 172#ifdef USE_CURL_MULTI
 173        if (!strcmp("http.maxrequests", var)) {
 174                max_requests = git_config_int(var, value);
 175                return 0;
 176        }
 177#endif
 178        if (!strcmp("http.lowspeedlimit", var)) {
 179                curl_low_speed_limit = (long)git_config_int(var, value);
 180                return 0;
 181        }
 182        if (!strcmp("http.lowspeedtime", var)) {
 183                curl_low_speed_time = (long)git_config_int(var, value);
 184                return 0;
 185        }
 186
 187        if (!strcmp("http.noepsv", var)) {
 188                curl_ftp_no_epsv = git_config_bool(var, value);
 189                return 0;
 190        }
 191        if (!strcmp("http.proxy", var))
 192                return git_config_string(&curl_http_proxy, var, value);
 193
 194        if (!strcmp("http.postbuffer", var)) {
 195                http_post_buffer = git_config_int(var, value);
 196                if (http_post_buffer < LARGE_PACKET_MAX)
 197                        http_post_buffer = LARGE_PACKET_MAX;
 198                return 0;
 199        }
 200
 201        if (!strcmp("http.useragent", var))
 202                return git_config_string(&user_agent, var, value);
 203
 204        /* Fall back on the default ones */
 205        return git_default_config(var, value, cb);
 206}
 207
 208static void init_curl_http_auth(CURL *result)
 209{
 210        if (user_name) {
 211                struct strbuf up = STRBUF_INIT;
 212                if (!user_pass)
 213                        user_pass = xstrdup(git_getpass("Password: "));
 214                strbuf_addf(&up, "%s:%s", user_name, user_pass);
 215                curl_easy_setopt(result, CURLOPT_USERPWD,
 216                                 strbuf_detach(&up, NULL));
 217        }
 218}
 219
 220static int has_cert_password(void)
 221{
 222        if (ssl_cert_password != NULL)
 223                return 1;
 224        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 225                return 0;
 226        /* Only prompt the user once. */
 227        ssl_cert_password_required = -1;
 228        ssl_cert_password = git_getpass("Certificate Password: ");
 229        if (ssl_cert_password != NULL) {
 230                ssl_cert_password = xstrdup(ssl_cert_password);
 231                return 1;
 232        } else
 233                return 0;
 234}
 235
 236static CURL *get_curl_handle(void)
 237{
 238        CURL *result = curl_easy_init();
 239
 240        if (!curl_ssl_verify) {
 241                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 242                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 243        } else {
 244                /* Verify authenticity of the peer's certificate */
 245                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 246                /* The name in the cert must match whom we tried to connect */
 247                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 248        }
 249
 250#if LIBCURL_VERSION_NUM >= 0x070907
 251        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 252#endif
 253#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 254        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 255#endif
 256
 257        init_curl_http_auth(result);
 258
 259        if (ssl_cert != NULL)
 260                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 261        if (has_cert_password())
 262                curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
 263#if LIBCURL_VERSION_NUM >= 0x070903
 264        if (ssl_key != NULL)
 265                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 266#endif
 267#if LIBCURL_VERSION_NUM >= 0x070908
 268        if (ssl_capath != NULL)
 269                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 270#endif
 271        if (ssl_cainfo != NULL)
 272                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 273        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 274
 275        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 276                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 277                                 curl_low_speed_limit);
 278                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 279                                 curl_low_speed_time);
 280        }
 281
 282        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 283
 284        if (getenv("GIT_CURL_VERBOSE"))
 285                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 286
 287        curl_easy_setopt(result, CURLOPT_USERAGENT,
 288                user_agent ? user_agent : GIT_HTTP_USER_AGENT);
 289
 290        if (curl_ftp_no_epsv)
 291                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 292
 293        if (curl_http_proxy)
 294                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 295
 296        return result;
 297}
 298
 299static void http_auth_init(const char *url)
 300{
 301        char *at, *colon, *cp, *slash;
 302        int len;
 303
 304        cp = strstr(url, "://");
 305        if (!cp)
 306                return;
 307
 308        /*
 309         * Ok, the URL looks like "proto://something".  Which one?
 310         * "proto://<user>:<pass>@<host>/...",
 311         * "proto://<user>@<host>/...", or just
 312         * "proto://<host>/..."?
 313         */
 314        cp += 3;
 315        at = strchr(cp, '@');
 316        colon = strchr(cp, ':');
 317        slash = strchrnul(cp, '/');
 318        if (!at || slash <= at)
 319                return; /* No credentials */
 320        if (!colon || at <= colon) {
 321                /* Only username */
 322                len = at - cp;
 323                user_name = xmalloc(len + 1);
 324                memcpy(user_name, cp, len);
 325                user_name[len] = '\0';
 326                user_pass = NULL;
 327        } else {
 328                len = colon - cp;
 329                user_name = xmalloc(len + 1);
 330                memcpy(user_name, cp, len);
 331                user_name[len] = '\0';
 332                len = at - (colon + 1);
 333                user_pass = xmalloc(len + 1);
 334                memcpy(user_pass, colon + 1, len);
 335                user_pass[len] = '\0';
 336        }
 337}
 338
 339static void set_from_env(const char **var, const char *envname)
 340{
 341        const char *val = getenv(envname);
 342        if (val)
 343                *var = val;
 344}
 345
 346void http_init(struct remote *remote)
 347{
 348        char *low_speed_limit;
 349        char *low_speed_time;
 350
 351        http_is_verbose = 0;
 352
 353        git_config(http_options, NULL);
 354
 355        curl_global_init(CURL_GLOBAL_ALL);
 356
 357        if (remote && remote->http_proxy)
 358                curl_http_proxy = xstrdup(remote->http_proxy);
 359
 360        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 361        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 362
 363#ifdef USE_CURL_MULTI
 364        {
 365                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 366                if (http_max_requests != NULL)
 367                        max_requests = atoi(http_max_requests);
 368        }
 369
 370        curlm = curl_multi_init();
 371        if (curlm == NULL) {
 372                fprintf(stderr, "Error creating curl multi handle.\n");
 373                exit(1);
 374        }
 375#endif
 376
 377        if (getenv("GIT_SSL_NO_VERIFY"))
 378                curl_ssl_verify = 0;
 379
 380        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 381#if LIBCURL_VERSION_NUM >= 0x070903
 382        set_from_env(&ssl_key, "GIT_SSL_KEY");
 383#endif
 384#if LIBCURL_VERSION_NUM >= 0x070908
 385        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 386#endif
 387        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 388
 389        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 390
 391        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 392        if (low_speed_limit != NULL)
 393                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 394        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 395        if (low_speed_time != NULL)
 396                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 397
 398        if (curl_ssl_verify == -1)
 399                curl_ssl_verify = 1;
 400
 401        curl_session_count = 0;
 402#ifdef USE_CURL_MULTI
 403        if (max_requests < 1)
 404                max_requests = DEFAULT_MAX_REQUESTS;
 405#endif
 406
 407        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 408                curl_ftp_no_epsv = 1;
 409
 410        if (remote && remote->url && remote->url[0]) {
 411                http_auth_init(remote->url[0]);
 412                if (!ssl_cert_password_required &&
 413                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 414                    !prefixcmp(remote->url[0], "https://"))
 415                        ssl_cert_password_required = 1;
 416        }
 417
 418#ifndef NO_CURL_EASY_DUPHANDLE
 419        curl_default = get_curl_handle();
 420#endif
 421}
 422
 423void http_cleanup(void)
 424{
 425        struct active_request_slot *slot = active_queue_head;
 426
 427        while (slot != NULL) {
 428                struct active_request_slot *next = slot->next;
 429                if (slot->curl != NULL) {
 430#ifdef USE_CURL_MULTI
 431                        curl_multi_remove_handle(curlm, slot->curl);
 432#endif
 433                        curl_easy_cleanup(slot->curl);
 434                }
 435                free(slot);
 436                slot = next;
 437        }
 438        active_queue_head = NULL;
 439
 440#ifndef NO_CURL_EASY_DUPHANDLE
 441        curl_easy_cleanup(curl_default);
 442#endif
 443
 444#ifdef USE_CURL_MULTI
 445        curl_multi_cleanup(curlm);
 446#endif
 447        curl_global_cleanup();
 448
 449        curl_slist_free_all(pragma_header);
 450        pragma_header = NULL;
 451
 452        curl_slist_free_all(no_pragma_header);
 453        no_pragma_header = NULL;
 454
 455        if (curl_http_proxy) {
 456                free((void *)curl_http_proxy);
 457                curl_http_proxy = NULL;
 458        }
 459
 460        if (ssl_cert_password != NULL) {
 461                memset(ssl_cert_password, 0, strlen(ssl_cert_password));
 462                free(ssl_cert_password);
 463                ssl_cert_password = NULL;
 464        }
 465        ssl_cert_password_required = 0;
 466}
 467
 468struct active_request_slot *get_active_slot(void)
 469{
 470        struct active_request_slot *slot = active_queue_head;
 471        struct active_request_slot *newslot;
 472
 473#ifdef USE_CURL_MULTI
 474        int num_transfers;
 475
 476        /* Wait for a slot to open up if the queue is full */
 477        while (active_requests >= max_requests) {
 478                curl_multi_perform(curlm, &num_transfers);
 479                if (num_transfers < active_requests)
 480                        process_curl_messages();
 481        }
 482#endif
 483
 484        while (slot != NULL && slot->in_use)
 485                slot = slot->next;
 486
 487        if (slot == NULL) {
 488                newslot = xmalloc(sizeof(*newslot));
 489                newslot->curl = NULL;
 490                newslot->in_use = 0;
 491                newslot->next = NULL;
 492
 493                slot = active_queue_head;
 494                if (slot == NULL) {
 495                        active_queue_head = newslot;
 496                } else {
 497                        while (slot->next != NULL)
 498                                slot = slot->next;
 499                        slot->next = newslot;
 500                }
 501                slot = newslot;
 502        }
 503
 504        if (slot->curl == NULL) {
 505#ifdef NO_CURL_EASY_DUPHANDLE
 506                slot->curl = get_curl_handle();
 507#else
 508                slot->curl = curl_easy_duphandle(curl_default);
 509#endif
 510                curl_session_count++;
 511        }
 512
 513        active_requests++;
 514        slot->in_use = 1;
 515        slot->local = NULL;
 516        slot->results = NULL;
 517        slot->finished = NULL;
 518        slot->callback_data = NULL;
 519        slot->callback_func = NULL;
 520        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 521        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 522        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 523        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 524        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 525        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 526        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 527
 528        return slot;
 529}
 530
 531int start_active_slot(struct active_request_slot *slot)
 532{
 533#ifdef USE_CURL_MULTI
 534        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 535        int num_transfers;
 536
 537        if (curlm_result != CURLM_OK &&
 538            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 539                active_requests--;
 540                slot->in_use = 0;
 541                return 0;
 542        }
 543
 544        /*
 545         * We know there must be something to do, since we just added
 546         * something.
 547         */
 548        curl_multi_perform(curlm, &num_transfers);
 549#endif
 550        return 1;
 551}
 552
 553#ifdef USE_CURL_MULTI
 554struct fill_chain {
 555        void *data;
 556        int (*fill)(void *);
 557        struct fill_chain *next;
 558};
 559
 560static struct fill_chain *fill_cfg;
 561
 562void add_fill_function(void *data, int (*fill)(void *))
 563{
 564        struct fill_chain *new = xmalloc(sizeof(*new));
 565        struct fill_chain **linkp = &fill_cfg;
 566        new->data = data;
 567        new->fill = fill;
 568        new->next = NULL;
 569        while (*linkp)
 570                linkp = &(*linkp)->next;
 571        *linkp = new;
 572}
 573
 574void fill_active_slots(void)
 575{
 576        struct active_request_slot *slot = active_queue_head;
 577
 578        while (active_requests < max_requests) {
 579                struct fill_chain *fill;
 580                for (fill = fill_cfg; fill; fill = fill->next)
 581                        if (fill->fill(fill->data))
 582                                break;
 583
 584                if (!fill)
 585                        break;
 586        }
 587
 588        while (slot != NULL) {
 589                if (!slot->in_use && slot->curl != NULL
 590                        && curl_session_count > min_curl_sessions) {
 591                        curl_easy_cleanup(slot->curl);
 592                        slot->curl = NULL;
 593                        curl_session_count--;
 594                }
 595                slot = slot->next;
 596        }
 597}
 598
 599void step_active_slots(void)
 600{
 601        int num_transfers;
 602        CURLMcode curlm_result;
 603
 604        do {
 605                curlm_result = curl_multi_perform(curlm, &num_transfers);
 606        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 607        if (num_transfers < active_requests) {
 608                process_curl_messages();
 609                fill_active_slots();
 610        }
 611}
 612#endif
 613
 614void run_active_slot(struct active_request_slot *slot)
 615{
 616#ifdef USE_CURL_MULTI
 617        long last_pos = 0;
 618        long current_pos;
 619        fd_set readfds;
 620        fd_set writefds;
 621        fd_set excfds;
 622        int max_fd;
 623        struct timeval select_timeout;
 624        int finished = 0;
 625
 626        slot->finished = &finished;
 627        while (!finished) {
 628                data_received = 0;
 629                step_active_slots();
 630
 631                if (!data_received && slot->local != NULL) {
 632                        current_pos = ftell(slot->local);
 633                        if (current_pos > last_pos)
 634                                data_received++;
 635                        last_pos = current_pos;
 636                }
 637
 638                if (slot->in_use && !data_received) {
 639                        max_fd = 0;
 640                        FD_ZERO(&readfds);
 641                        FD_ZERO(&writefds);
 642                        FD_ZERO(&excfds);
 643                        select_timeout.tv_sec = 0;
 644                        select_timeout.tv_usec = 50000;
 645                        select(max_fd, &readfds, &writefds,
 646                               &excfds, &select_timeout);
 647                }
 648        }
 649#else
 650        while (slot->in_use) {
 651                slot->curl_result = curl_easy_perform(slot->curl);
 652                finish_active_slot(slot);
 653        }
 654#endif
 655}
 656
 657static void closedown_active_slot(struct active_request_slot *slot)
 658{
 659        active_requests--;
 660        slot->in_use = 0;
 661}
 662
 663static void release_active_slot(struct active_request_slot *slot)
 664{
 665        closedown_active_slot(slot);
 666        if (slot->curl && curl_session_count > min_curl_sessions) {
 667#ifdef USE_CURL_MULTI
 668                curl_multi_remove_handle(curlm, slot->curl);
 669#endif
 670                curl_easy_cleanup(slot->curl);
 671                slot->curl = NULL;
 672                curl_session_count--;
 673        }
 674#ifdef USE_CURL_MULTI
 675        fill_active_slots();
 676#endif
 677}
 678
 679void finish_active_slot(struct active_request_slot *slot)
 680{
 681        closedown_active_slot(slot);
 682        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 683
 684        if (slot->finished != NULL)
 685                (*slot->finished) = 1;
 686
 687        /* Store slot results so they can be read after the slot is reused */
 688        if (slot->results != NULL) {
 689                slot->results->curl_result = slot->curl_result;
 690                slot->results->http_code = slot->http_code;
 691        }
 692
 693        /* Run callback if appropriate */
 694        if (slot->callback_func != NULL)
 695                slot->callback_func(slot->callback_data);
 696}
 697
 698void finish_all_active_slots(void)
 699{
 700        struct active_request_slot *slot = active_queue_head;
 701
 702        while (slot != NULL)
 703                if (slot->in_use) {
 704                        run_active_slot(slot);
 705                        slot = active_queue_head;
 706                } else {
 707                        slot = slot->next;
 708                }
 709}
 710
 711/* Helpers for modifying and creating URLs */
 712static inline int needs_quote(int ch)
 713{
 714        if (((ch >= 'A') && (ch <= 'Z'))
 715                        || ((ch >= 'a') && (ch <= 'z'))
 716                        || ((ch >= '0') && (ch <= '9'))
 717                        || (ch == '/')
 718                        || (ch == '-')
 719                        || (ch == '.'))
 720                return 0;
 721        return 1;
 722}
 723
 724static inline int hex(int v)
 725{
 726        if (v < 10)
 727                return '0' + v;
 728        else
 729                return 'A' + v - 10;
 730}
 731
 732static char *quote_ref_url(const char *base, const char *ref)
 733{
 734        struct strbuf buf = STRBUF_INIT;
 735        const char *cp;
 736        int ch;
 737
 738        end_url_with_slash(&buf, base);
 739
 740        for (cp = ref; (ch = *cp) != 0; cp++)
 741                if (needs_quote(ch))
 742                        strbuf_addf(&buf, "%%%02x", ch);
 743                else
 744                        strbuf_addch(&buf, *cp);
 745
 746        return strbuf_detach(&buf, NULL);
 747}
 748
 749void append_remote_object_url(struct strbuf *buf, const char *url,
 750                              const char *hex,
 751                              int only_two_digit_prefix)
 752{
 753        end_url_with_slash(buf, url);
 754
 755        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 756        if (!only_two_digit_prefix)
 757                strbuf_addf(buf, "%s", hex+2);
 758}
 759
 760char *get_remote_object_url(const char *url, const char *hex,
 761                            int only_two_digit_prefix)
 762{
 763        struct strbuf buf = STRBUF_INIT;
 764        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 765        return strbuf_detach(&buf, NULL);
 766}
 767
 768/* http_request() targets */
 769#define HTTP_REQUEST_STRBUF     0
 770#define HTTP_REQUEST_FILE       1
 771
 772static int http_request(const char *url, void *result, int target, int options)
 773{
 774        struct active_request_slot *slot;
 775        struct slot_results results;
 776        struct curl_slist *headers = NULL;
 777        struct strbuf buf = STRBUF_INIT;
 778        int ret;
 779
 780        slot = get_active_slot();
 781        slot->results = &results;
 782        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 783
 784        if (result == NULL) {
 785                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 786        } else {
 787                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 788                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 789
 790                if (target == HTTP_REQUEST_FILE) {
 791                        long posn = ftell(result);
 792                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 793                                         fwrite);
 794                        if (posn > 0) {
 795                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 796                                headers = curl_slist_append(headers, buf.buf);
 797                                strbuf_reset(&buf);
 798                        }
 799                        slot->local = result;
 800                } else
 801                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 802                                         fwrite_buffer);
 803        }
 804
 805        strbuf_addstr(&buf, "Pragma:");
 806        if (options & HTTP_NO_CACHE)
 807                strbuf_addstr(&buf, " no-cache");
 808
 809        headers = curl_slist_append(headers, buf.buf);
 810
 811        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 812        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 813
 814        if (start_active_slot(slot)) {
 815                run_active_slot(slot);
 816                if (results.curl_result == CURLE_OK)
 817                        ret = HTTP_OK;
 818                else if (missing_target(&results))
 819                        ret = HTTP_MISSING_TARGET;
 820                else if (results.http_code == 401) {
 821                        if (user_name) {
 822                                ret = HTTP_NOAUTH;
 823                        } else {
 824                                /*
 825                                 * git_getpass is needed here because its very likely stdin/stdout are
 826                                 * pipes to our parent process.  So we instead need to use /dev/tty,
 827                                 * but that is non-portable.  Using git_getpass() can at least be stubbed
 828                                 * on other platforms with a different implementation if/when necessary.
 829                                 */
 830                                user_name = xstrdup(git_getpass("Username: "));
 831                                init_curl_http_auth(slot->curl);
 832                                ret = HTTP_REAUTH;
 833                        }
 834                } else
 835                        ret = HTTP_ERROR;
 836        } else {
 837                error("Unable to start HTTP request for %s", url);
 838                ret = HTTP_START_FAILED;
 839        }
 840
 841        slot->local = NULL;
 842        curl_slist_free_all(headers);
 843        strbuf_release(&buf);
 844
 845        return ret;
 846}
 847
 848int http_get_strbuf(const char *url, struct strbuf *result, int options)
 849{
 850        int http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
 851        if (http_ret == HTTP_REAUTH) {
 852                http_ret = http_request(url, result, HTTP_REQUEST_STRBUF, options);
 853        }
 854        return http_ret;
 855}
 856
 857/*
 858 * Downloads an url and stores the result in the given file.
 859 *
 860 * If a previous interrupted download is detected (i.e. a previous temporary
 861 * file is still around) the download is resumed.
 862 */
 863static int http_get_file(const char *url, const char *filename, int options)
 864{
 865        int ret;
 866        struct strbuf tmpfile = STRBUF_INIT;
 867        FILE *result;
 868
 869        strbuf_addf(&tmpfile, "%s.temp", filename);
 870        result = fopen(tmpfile.buf, "a");
 871        if (! result) {
 872                error("Unable to open local file %s", tmpfile.buf);
 873                ret = HTTP_ERROR;
 874                goto cleanup;
 875        }
 876
 877        ret = http_request(url, result, HTTP_REQUEST_FILE, options);
 878        fclose(result);
 879
 880        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 881                ret = HTTP_ERROR;
 882cleanup:
 883        strbuf_release(&tmpfile);
 884        return ret;
 885}
 886
 887int http_error(const char *url, int ret)
 888{
 889        /* http_request has already handled HTTP_START_FAILED. */
 890        if (ret != HTTP_START_FAILED)
 891                error("%s while accessing %s\n", curl_errorstr, url);
 892
 893        return ret;
 894}
 895
 896int http_fetch_ref(const char *base, struct ref *ref)
 897{
 898        char *url;
 899        struct strbuf buffer = STRBUF_INIT;
 900        int ret = -1;
 901
 902        url = quote_ref_url(base, ref->name);
 903        if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 904                strbuf_rtrim(&buffer);
 905                if (buffer.len == 40)
 906                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 907                else if (!prefixcmp(buffer.buf, "ref: ")) {
 908                        ref->symref = xstrdup(buffer.buf + 5);
 909                        ret = 0;
 910                }
 911        }
 912
 913        strbuf_release(&buffer);
 914        free(url);
 915        return ret;
 916}
 917
 918/* Helpers for fetching packs */
 919static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 920{
 921        char *url, *tmp;
 922        struct strbuf buf = STRBUF_INIT;
 923
 924        if (http_is_verbose)
 925                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 926
 927        end_url_with_slash(&buf, base_url);
 928        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 929        url = strbuf_detach(&buf, NULL);
 930
 931        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 932        tmp = strbuf_detach(&buf, NULL);
 933
 934        if (http_get_file(url, tmp, 0) != HTTP_OK) {
 935                error("Unable to get pack index %s\n", url);
 936                free(tmp);
 937                tmp = NULL;
 938        }
 939
 940        free(url);
 941        return tmp;
 942}
 943
 944static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 945        unsigned char *sha1, const char *base_url)
 946{
 947        struct packed_git *new_pack;
 948        char *tmp_idx = NULL;
 949        int ret;
 950
 951        if (has_pack_index(sha1)) {
 952                new_pack = parse_pack_index(sha1, NULL);
 953                if (!new_pack)
 954                        return -1; /* parse_pack_index() already issued error message */
 955                goto add_pack;
 956        }
 957
 958        tmp_idx = fetch_pack_index(sha1, base_url);
 959        if (!tmp_idx)
 960                return -1;
 961
 962        new_pack = parse_pack_index(sha1, tmp_idx);
 963        if (!new_pack) {
 964                unlink(tmp_idx);
 965                free(tmp_idx);
 966
 967                return -1; /* parse_pack_index() already issued error message */
 968        }
 969
 970        ret = verify_pack_index(new_pack);
 971        if (!ret) {
 972                close_pack_index(new_pack);
 973                ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
 974        }
 975        free(tmp_idx);
 976        if (ret)
 977                return -1;
 978
 979add_pack:
 980        new_pack->next = *packs_head;
 981        *packs_head = new_pack;
 982        return 0;
 983}
 984
 985int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 986{
 987        int ret = 0, i = 0;
 988        char *url, *data;
 989        struct strbuf buf = STRBUF_INIT;
 990        unsigned char sha1[20];
 991
 992        end_url_with_slash(&buf, base_url);
 993        strbuf_addstr(&buf, "objects/info/packs");
 994        url = strbuf_detach(&buf, NULL);
 995
 996        ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 997        if (ret != HTTP_OK)
 998                goto cleanup;
 999
1000        data = buf.buf;
1001        while (i < buf.len) {
1002                switch (data[i]) {
1003                case 'P':
1004                        i++;
1005                        if (i + 52 <= buf.len &&
1006                            !prefixcmp(data + i, " pack-") &&
1007                            !prefixcmp(data + i + 46, ".pack\n")) {
1008                                get_sha1_hex(data + i + 6, sha1);
1009                                fetch_and_setup_pack_index(packs_head, sha1,
1010                                                      base_url);
1011                                i += 51;
1012                                break;
1013                        }
1014                default:
1015                        while (i < buf.len && data[i] != '\n')
1016                                i++;
1017                }
1018                i++;
1019        }
1020
1021cleanup:
1022        free(url);
1023        return ret;
1024}
1025
1026void release_http_pack_request(struct http_pack_request *preq)
1027{
1028        if (preq->packfile != NULL) {
1029                fclose(preq->packfile);
1030                preq->packfile = NULL;
1031                preq->slot->local = NULL;
1032        }
1033        if (preq->range_header != NULL) {
1034                curl_slist_free_all(preq->range_header);
1035                preq->range_header = NULL;
1036        }
1037        preq->slot = NULL;
1038        free(preq->url);
1039}
1040
1041int finish_http_pack_request(struct http_pack_request *preq)
1042{
1043        struct packed_git **lst;
1044        struct packed_git *p = preq->target;
1045        char *tmp_idx;
1046        struct child_process ip;
1047        const char *ip_argv[8];
1048
1049        close_pack_index(p);
1050
1051        fclose(preq->packfile);
1052        preq->packfile = NULL;
1053        preq->slot->local = NULL;
1054
1055        lst = preq->lst;
1056        while (*lst != p)
1057                lst = &((*lst)->next);
1058        *lst = (*lst)->next;
1059
1060        tmp_idx = xstrdup(preq->tmpfile);
1061        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1062               ".idx.temp");
1063
1064        ip_argv[0] = "index-pack";
1065        ip_argv[1] = "-o";
1066        ip_argv[2] = tmp_idx;
1067        ip_argv[3] = preq->tmpfile;
1068        ip_argv[4] = NULL;
1069
1070        memset(&ip, 0, sizeof(ip));
1071        ip.argv = ip_argv;
1072        ip.git_cmd = 1;
1073        ip.no_stdin = 1;
1074        ip.no_stdout = 1;
1075
1076        if (run_command(&ip)) {
1077                unlink(preq->tmpfile);
1078                unlink(tmp_idx);
1079                free(tmp_idx);
1080                return -1;
1081        }
1082
1083        unlink(sha1_pack_index_name(p->sha1));
1084
1085        if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1086         || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1087                free(tmp_idx);
1088                return -1;
1089        }
1090
1091        install_packed_git(p);
1092        free(tmp_idx);
1093        return 0;
1094}
1095
1096struct http_pack_request *new_http_pack_request(
1097        struct packed_git *target, const char *base_url)
1098{
1099        long prev_posn = 0;
1100        char range[RANGE_HEADER_SIZE];
1101        struct strbuf buf = STRBUF_INIT;
1102        struct http_pack_request *preq;
1103
1104        preq = xmalloc(sizeof(*preq));
1105        preq->target = target;
1106        preq->range_header = NULL;
1107
1108        end_url_with_slash(&buf, base_url);
1109        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1110                sha1_to_hex(target->sha1));
1111        preq->url = strbuf_detach(&buf, NULL);
1112
1113        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1114                sha1_pack_name(target->sha1));
1115        preq->packfile = fopen(preq->tmpfile, "a");
1116        if (!preq->packfile) {
1117                error("Unable to open local file %s for pack",
1118                      preq->tmpfile);
1119                goto abort;
1120        }
1121
1122        preq->slot = get_active_slot();
1123        preq->slot->local = preq->packfile;
1124        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1125        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1126        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1127        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1128                no_pragma_header);
1129
1130        /*
1131         * If there is data present from a previous transfer attempt,
1132         * resume where it left off
1133         */
1134        prev_posn = ftell(preq->packfile);
1135        if (prev_posn>0) {
1136                if (http_is_verbose)
1137                        fprintf(stderr,
1138                                "Resuming fetch of pack %s at byte %ld\n",
1139                                sha1_to_hex(target->sha1), prev_posn);
1140                sprintf(range, "Range: bytes=%ld-", prev_posn);
1141                preq->range_header = curl_slist_append(NULL, range);
1142                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1143                        preq->range_header);
1144        }
1145
1146        return preq;
1147
1148abort:
1149        free(preq->url);
1150        free(preq);
1151        return NULL;
1152}
1153
1154/* Helpers for fetching objects (loose) */
1155static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1156                               void *data)
1157{
1158        unsigned char expn[4096];
1159        size_t size = eltsize * nmemb;
1160        int posn = 0;
1161        struct http_object_request *freq =
1162                (struct http_object_request *)data;
1163        do {
1164                ssize_t retval = xwrite(freq->localfile,
1165                                        (char *) ptr + posn, size - posn);
1166                if (retval < 0)
1167                        return posn;
1168                posn += retval;
1169        } while (posn < size);
1170
1171        freq->stream.avail_in = size;
1172        freq->stream.next_in = ptr;
1173        do {
1174                freq->stream.next_out = expn;
1175                freq->stream.avail_out = sizeof(expn);
1176                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1177                git_SHA1_Update(&freq->c, expn,
1178                                sizeof(expn) - freq->stream.avail_out);
1179        } while (freq->stream.avail_in && freq->zret == Z_OK);
1180        data_received++;
1181        return size;
1182}
1183
1184struct http_object_request *new_http_object_request(const char *base_url,
1185        unsigned char *sha1)
1186{
1187        char *hex = sha1_to_hex(sha1);
1188        char *filename;
1189        char prevfile[PATH_MAX];
1190        int prevlocal;
1191        unsigned char prev_buf[PREV_BUF_SIZE];
1192        ssize_t prev_read = 0;
1193        long prev_posn = 0;
1194        char range[RANGE_HEADER_SIZE];
1195        struct curl_slist *range_header = NULL;
1196        struct http_object_request *freq;
1197
1198        freq = xmalloc(sizeof(*freq));
1199        hashcpy(freq->sha1, sha1);
1200        freq->localfile = -1;
1201
1202        filename = sha1_file_name(sha1);
1203        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1204                 "%s.temp", filename);
1205
1206        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1207        unlink_or_warn(prevfile);
1208        rename(freq->tmpfile, prevfile);
1209        unlink_or_warn(freq->tmpfile);
1210
1211        if (freq->localfile != -1)
1212                error("fd leakage in start: %d", freq->localfile);
1213        freq->localfile = open(freq->tmpfile,
1214                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1215        /*
1216         * This could have failed due to the "lazy directory creation";
1217         * try to mkdir the last path component.
1218         */
1219        if (freq->localfile < 0 && errno == ENOENT) {
1220                char *dir = strrchr(freq->tmpfile, '/');
1221                if (dir) {
1222                        *dir = 0;
1223                        mkdir(freq->tmpfile, 0777);
1224                        *dir = '/';
1225                }
1226                freq->localfile = open(freq->tmpfile,
1227                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1228        }
1229
1230        if (freq->localfile < 0) {
1231                error("Couldn't create temporary file %s: %s",
1232                      freq->tmpfile, strerror(errno));
1233                goto abort;
1234        }
1235
1236        memset(&freq->stream, 0, sizeof(freq->stream));
1237
1238        git_inflate_init(&freq->stream);
1239
1240        git_SHA1_Init(&freq->c);
1241
1242        freq->url = get_remote_object_url(base_url, hex, 0);
1243
1244        /*
1245         * If a previous temp file is present, process what was already
1246         * fetched.
1247         */
1248        prevlocal = open(prevfile, O_RDONLY);
1249        if (prevlocal != -1) {
1250                do {
1251                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1252                        if (prev_read>0) {
1253                                if (fwrite_sha1_file(prev_buf,
1254                                                     1,
1255                                                     prev_read,
1256                                                     freq) == prev_read) {
1257                                        prev_posn += prev_read;
1258                                } else {
1259                                        prev_read = -1;
1260                                }
1261                        }
1262                } while (prev_read > 0);
1263                close(prevlocal);
1264        }
1265        unlink_or_warn(prevfile);
1266
1267        /*
1268         * Reset inflate/SHA1 if there was an error reading the previous temp
1269         * file; also rewind to the beginning of the local file.
1270         */
1271        if (prev_read == -1) {
1272                memset(&freq->stream, 0, sizeof(freq->stream));
1273                git_inflate_init(&freq->stream);
1274                git_SHA1_Init(&freq->c);
1275                if (prev_posn>0) {
1276                        prev_posn = 0;
1277                        lseek(freq->localfile, 0, SEEK_SET);
1278                        if (ftruncate(freq->localfile, 0) < 0) {
1279                                error("Couldn't truncate temporary file %s: %s",
1280                                          freq->tmpfile, strerror(errno));
1281                                goto abort;
1282                        }
1283                }
1284        }
1285
1286        freq->slot = get_active_slot();
1287
1288        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1289        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1290        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1291        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1292        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1293
1294        /*
1295         * If we have successfully processed data from a previous fetch
1296         * attempt, only fetch the data we don't already have.
1297         */
1298        if (prev_posn>0) {
1299                if (http_is_verbose)
1300                        fprintf(stderr,
1301                                "Resuming fetch of object %s at byte %ld\n",
1302                                hex, prev_posn);
1303                sprintf(range, "Range: bytes=%ld-", prev_posn);
1304                range_header = curl_slist_append(range_header, range);
1305                curl_easy_setopt(freq->slot->curl,
1306                                 CURLOPT_HTTPHEADER, range_header);
1307        }
1308
1309        return freq;
1310
1311abort:
1312        free(filename);
1313        free(freq->url);
1314        free(freq);
1315        return NULL;
1316}
1317
1318void process_http_object_request(struct http_object_request *freq)
1319{
1320        if (freq->slot == NULL)
1321                return;
1322        freq->curl_result = freq->slot->curl_result;
1323        freq->http_code = freq->slot->http_code;
1324        freq->slot = NULL;
1325}
1326
1327int finish_http_object_request(struct http_object_request *freq)
1328{
1329        struct stat st;
1330
1331        close(freq->localfile);
1332        freq->localfile = -1;
1333
1334        process_http_object_request(freq);
1335
1336        if (freq->http_code == 416) {
1337                warning("requested range invalid; we may already have all the data.");
1338        } else if (freq->curl_result != CURLE_OK) {
1339                if (stat(freq->tmpfile, &st) == 0)
1340                        if (st.st_size == 0)
1341                                unlink_or_warn(freq->tmpfile);
1342                return -1;
1343        }
1344
1345        git_inflate_end(&freq->stream);
1346        git_SHA1_Final(freq->real_sha1, &freq->c);
1347        if (freq->zret != Z_STREAM_END) {
1348                unlink_or_warn(freq->tmpfile);
1349                return -1;
1350        }
1351        if (hashcmp(freq->sha1, freq->real_sha1)) {
1352                unlink_or_warn(freq->tmpfile);
1353                return -1;
1354        }
1355        freq->rename =
1356                move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1357
1358        return freq->rename;
1359}
1360
1361void abort_http_object_request(struct http_object_request *freq)
1362{
1363        unlink_or_warn(freq->tmpfile);
1364
1365        release_http_object_request(freq);
1366}
1367
1368void release_http_object_request(struct http_object_request *freq)
1369{
1370        if (freq->localfile != -1) {
1371                close(freq->localfile);
1372                freq->localfile = -1;
1373        }
1374        if (freq->url != NULL) {
1375                free(freq->url);
1376                freq->url = NULL;
1377        }
1378        if (freq->slot != NULL) {
1379                freq->slot->callback_func = NULL;
1380                freq->slot->callback_data = NULL;
1381                release_active_slot(freq->slot);
1382                freq->slot = NULL;
1383        }
1384}