Andrew's git / gitweb.git / http.c
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http.con commit remote-curl: do not call run_slot repeatedly (abf8df8)
   1#include "http.h"
   2#include "pack.h"
   3#include "sideband.h"
   4#include "run-command.h"
   5#include "url.h"
   6#include "credential.h"
   7
   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 const char *curl_cookie_file;
  45static struct credential http_auth = CREDENTIAL_INIT;
  46static int http_proactive_auth;
  47static const char *user_agent;
  48
  49#if LIBCURL_VERSION_NUM >= 0x071700
  50/* Use CURLOPT_KEYPASSWD as is */
  51#elif LIBCURL_VERSION_NUM >= 0x070903
  52#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  53#else
  54#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  55#endif
  56
  57static struct credential cert_auth = CREDENTIAL_INIT;
  58static int ssl_cert_password_required;
  59
  60static struct curl_slist *pragma_header;
  61static struct curl_slist *no_pragma_header;
  62
  63static struct active_request_slot *active_queue_head;
  64
  65size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  66{
  67        size_t size = eltsize * nmemb;
  68        struct buffer *buffer = buffer_;
  69
  70        if (size > buffer->buf.len - buffer->posn)
  71                size = buffer->buf.len - buffer->posn;
  72        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  73        buffer->posn += size;
  74
  75        return size;
  76}
  77
  78#ifndef NO_CURL_IOCTL
  79curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  80{
  81        struct buffer *buffer = clientp;
  82
  83        switch (cmd) {
  84        case CURLIOCMD_NOP:
  85                return CURLIOE_OK;
  86
  87        case CURLIOCMD_RESTARTREAD:
  88                buffer->posn = 0;
  89                return CURLIOE_OK;
  90
  91        default:
  92                return CURLIOE_UNKNOWNCMD;
  93        }
  94}
  95#endif
  96
  97size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  98{
  99        size_t size = eltsize * nmemb;
 100        struct strbuf *buffer = buffer_;
 101
 102        strbuf_add(buffer, ptr, size);
 103        return size;
 104}
 105
 106size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 107{
 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.cookiefile", var))
 195                return git_config_string(&curl_cookie_file, var, value);
 196
 197        if (!strcmp("http.postbuffer", var)) {
 198                http_post_buffer = git_config_int(var, value);
 199                if (http_post_buffer < LARGE_PACKET_MAX)
 200                        http_post_buffer = LARGE_PACKET_MAX;
 201                return 0;
 202        }
 203
 204        if (!strcmp("http.useragent", var))
 205                return git_config_string(&user_agent, var, value);
 206
 207        /* Fall back on the default ones */
 208        return git_default_config(var, value, cb);
 209}
 210
 211static void init_curl_http_auth(CURL *result)
 212{
 213        if (!http_auth.username)
 214                return;
 215
 216        credential_fill(&http_auth);
 217
 218#if LIBCURL_VERSION_NUM >= 0x071301
 219        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 220        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 221#else
 222        {
 223                static struct strbuf up = STRBUF_INIT;
 224                strbuf_reset(&up);
 225                strbuf_addf(&up, "%s:%s",
 226                            http_auth.username, http_auth.password);
 227                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 228        }
 229#endif
 230}
 231
 232static int has_cert_password(void)
 233{
 234        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 235                return 0;
 236        if (!cert_auth.password) {
 237                cert_auth.protocol = xstrdup("cert");
 238                cert_auth.path = xstrdup(ssl_cert);
 239                credential_fill(&cert_auth);
 240        }
 241        return 1;
 242}
 243
 244static CURL *get_curl_handle(void)
 245{
 246        CURL *result = curl_easy_init();
 247
 248        if (!curl_ssl_verify) {
 249                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 250                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 251        } else {
 252                /* Verify authenticity of the peer's certificate */
 253                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 254                /* The name in the cert must match whom we tried to connect */
 255                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 256        }
 257
 258#if LIBCURL_VERSION_NUM >= 0x070907
 259        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 260#endif
 261#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 262        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 263#endif
 264
 265        if (http_proactive_auth)
 266                init_curl_http_auth(result);
 267
 268        if (ssl_cert != NULL)
 269                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 270        if (has_cert_password())
 271                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 272#if LIBCURL_VERSION_NUM >= 0x070903
 273        if (ssl_key != NULL)
 274                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 275#endif
 276#if LIBCURL_VERSION_NUM >= 0x070908
 277        if (ssl_capath != NULL)
 278                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 279#endif
 280        if (ssl_cainfo != NULL)
 281                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 282        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 283
 284        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 285                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 286                                 curl_low_speed_limit);
 287                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 288                                 curl_low_speed_time);
 289        }
 290
 291        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 292#if LIBCURL_VERSION_NUM >= 0x071301
 293        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 294#elif LIBCURL_VERSION_NUM >= 0x071101
 295        curl_easy_setopt(result, CURLOPT_POST301, 1);
 296#endif
 297
 298        if (getenv("GIT_CURL_VERBOSE"))
 299                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 300
 301        curl_easy_setopt(result, CURLOPT_USERAGENT,
 302                user_agent ? user_agent : GIT_HTTP_USER_AGENT);
 303
 304        if (curl_ftp_no_epsv)
 305                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 306
 307        if (curl_http_proxy) {
 308                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 309                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 310        }
 311
 312        return result;
 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, const char *url, int proactive_auth)
 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        http_proactive_auth = proactive_auth;
 334
 335        if (remote && remote->http_proxy)
 336                curl_http_proxy = xstrdup(remote->http_proxy);
 337
 338        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 339        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 340
 341#ifdef USE_CURL_MULTI
 342        {
 343                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 344                if (http_max_requests != NULL)
 345                        max_requests = atoi(http_max_requests);
 346        }
 347
 348        curlm = curl_multi_init();
 349        if (curlm == NULL) {
 350                fprintf(stderr, "Error creating curl multi handle.\n");
 351                exit(1);
 352        }
 353#endif
 354
 355        if (getenv("GIT_SSL_NO_VERIFY"))
 356                curl_ssl_verify = 0;
 357
 358        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 359#if LIBCURL_VERSION_NUM >= 0x070903
 360        set_from_env(&ssl_key, "GIT_SSL_KEY");
 361#endif
 362#if LIBCURL_VERSION_NUM >= 0x070908
 363        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 364#endif
 365        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 366
 367        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 368
 369        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 370        if (low_speed_limit != NULL)
 371                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 372        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 373        if (low_speed_time != NULL)
 374                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 375
 376        if (curl_ssl_verify == -1)
 377                curl_ssl_verify = 1;
 378
 379        curl_session_count = 0;
 380#ifdef USE_CURL_MULTI
 381        if (max_requests < 1)
 382                max_requests = DEFAULT_MAX_REQUESTS;
 383#endif
 384
 385        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 386                curl_ftp_no_epsv = 1;
 387
 388        if (url) {
 389                credential_from_url(&http_auth, url);
 390                if (!ssl_cert_password_required &&
 391                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 392                    !prefixcmp(url, "https://"))
 393                        ssl_cert_password_required = 1;
 394        }
 395
 396#ifndef NO_CURL_EASY_DUPHANDLE
 397        curl_default = get_curl_handle();
 398#endif
 399}
 400
 401void http_cleanup(void)
 402{
 403        struct active_request_slot *slot = active_queue_head;
 404
 405        while (slot != NULL) {
 406                struct active_request_slot *next = slot->next;
 407                if (slot->curl != NULL) {
 408#ifdef USE_CURL_MULTI
 409                        curl_multi_remove_handle(curlm, slot->curl);
 410#endif
 411                        curl_easy_cleanup(slot->curl);
 412                }
 413                free(slot);
 414                slot = next;
 415        }
 416        active_queue_head = NULL;
 417
 418#ifndef NO_CURL_EASY_DUPHANDLE
 419        curl_easy_cleanup(curl_default);
 420#endif
 421
 422#ifdef USE_CURL_MULTI
 423        curl_multi_cleanup(curlm);
 424#endif
 425        curl_global_cleanup();
 426
 427        curl_slist_free_all(pragma_header);
 428        pragma_header = NULL;
 429
 430        curl_slist_free_all(no_pragma_header);
 431        no_pragma_header = NULL;
 432
 433        if (curl_http_proxy) {
 434                free((void *)curl_http_proxy);
 435                curl_http_proxy = NULL;
 436        }
 437
 438        if (cert_auth.password != NULL) {
 439                memset(cert_auth.password, 0, strlen(cert_auth.password));
 440                free(cert_auth.password);
 441                cert_auth.password = NULL;
 442        }
 443        ssl_cert_password_required = 0;
 444}
 445
 446struct active_request_slot *get_active_slot(void)
 447{
 448        struct active_request_slot *slot = active_queue_head;
 449        struct active_request_slot *newslot;
 450
 451#ifdef USE_CURL_MULTI
 452        int num_transfers;
 453
 454        /* Wait for a slot to open up if the queue is full */
 455        while (active_requests >= max_requests) {
 456                curl_multi_perform(curlm, &num_transfers);
 457                if (num_transfers < active_requests)
 458                        process_curl_messages();
 459        }
 460#endif
 461
 462        while (slot != NULL && slot->in_use)
 463                slot = slot->next;
 464
 465        if (slot == NULL) {
 466                newslot = xmalloc(sizeof(*newslot));
 467                newslot->curl = NULL;
 468                newslot->in_use = 0;
 469                newslot->next = NULL;
 470
 471                slot = active_queue_head;
 472                if (slot == NULL) {
 473                        active_queue_head = newslot;
 474                } else {
 475                        while (slot->next != NULL)
 476                                slot = slot->next;
 477                        slot->next = newslot;
 478                }
 479                slot = newslot;
 480        }
 481
 482        if (slot->curl == NULL) {
 483#ifdef NO_CURL_EASY_DUPHANDLE
 484                slot->curl = get_curl_handle();
 485#else
 486                slot->curl = curl_easy_duphandle(curl_default);
 487#endif
 488                curl_session_count++;
 489        }
 490
 491        active_requests++;
 492        slot->in_use = 1;
 493        slot->results = NULL;
 494        slot->finished = NULL;
 495        slot->callback_data = NULL;
 496        slot->callback_func = NULL;
 497        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 498        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 499        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 500        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 501        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 502        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 503        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 504        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 505        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 506        if (http_auth.password)
 507                init_curl_http_auth(slot->curl);
 508
 509        return slot;
 510}
 511
 512int start_active_slot(struct active_request_slot *slot)
 513{
 514#ifdef USE_CURL_MULTI
 515        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 516        int num_transfers;
 517
 518        if (curlm_result != CURLM_OK &&
 519            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 520                active_requests--;
 521                slot->in_use = 0;
 522                return 0;
 523        }
 524
 525        /*
 526         * We know there must be something to do, since we just added
 527         * something.
 528         */
 529        curl_multi_perform(curlm, &num_transfers);
 530#endif
 531        return 1;
 532}
 533
 534#ifdef USE_CURL_MULTI
 535struct fill_chain {
 536        void *data;
 537        int (*fill)(void *);
 538        struct fill_chain *next;
 539};
 540
 541static struct fill_chain *fill_cfg;
 542
 543void add_fill_function(void *data, int (*fill)(void *))
 544{
 545        struct fill_chain *new = xmalloc(sizeof(*new));
 546        struct fill_chain **linkp = &fill_cfg;
 547        new->data = data;
 548        new->fill = fill;
 549        new->next = NULL;
 550        while (*linkp)
 551                linkp = &(*linkp)->next;
 552        *linkp = new;
 553}
 554
 555void fill_active_slots(void)
 556{
 557        struct active_request_slot *slot = active_queue_head;
 558
 559        while (active_requests < max_requests) {
 560                struct fill_chain *fill;
 561                for (fill = fill_cfg; fill; fill = fill->next)
 562                        if (fill->fill(fill->data))
 563                                break;
 564
 565                if (!fill)
 566                        break;
 567        }
 568
 569        while (slot != NULL) {
 570                if (!slot->in_use && slot->curl != NULL
 571                        && curl_session_count > min_curl_sessions) {
 572                        curl_easy_cleanup(slot->curl);
 573                        slot->curl = NULL;
 574                        curl_session_count--;
 575                }
 576                slot = slot->next;
 577        }
 578}
 579
 580void step_active_slots(void)
 581{
 582        int num_transfers;
 583        CURLMcode curlm_result;
 584
 585        do {
 586                curlm_result = curl_multi_perform(curlm, &num_transfers);
 587        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 588        if (num_transfers < active_requests) {
 589                process_curl_messages();
 590                fill_active_slots();
 591        }
 592}
 593#endif
 594
 595void run_active_slot(struct active_request_slot *slot)
 596{
 597#ifdef USE_CURL_MULTI
 598        fd_set readfds;
 599        fd_set writefds;
 600        fd_set excfds;
 601        int max_fd;
 602        struct timeval select_timeout;
 603        int finished = 0;
 604
 605        slot->finished = &finished;
 606        while (!finished) {
 607                step_active_slots();
 608
 609                if (slot->in_use) {
 610#if LIBCURL_VERSION_NUM >= 0x070f04
 611                        long curl_timeout;
 612                        curl_multi_timeout(curlm, &curl_timeout);
 613                        if (curl_timeout == 0) {
 614                                continue;
 615                        } else if (curl_timeout == -1) {
 616                                select_timeout.tv_sec  = 0;
 617                                select_timeout.tv_usec = 50000;
 618                        } else {
 619                                select_timeout.tv_sec  =  curl_timeout / 1000;
 620                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 621                        }
 622#else
 623                        select_timeout.tv_sec  = 0;
 624                        select_timeout.tv_usec = 50000;
 625#endif
 626
 627                        max_fd = -1;
 628                        FD_ZERO(&readfds);
 629                        FD_ZERO(&writefds);
 630                        FD_ZERO(&excfds);
 631                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 632
 633                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 634                }
 635        }
 636#else
 637        while (slot->in_use) {
 638                slot->curl_result = curl_easy_perform(slot->curl);
 639                finish_active_slot(slot);
 640        }
 641#endif
 642}
 643
 644static void closedown_active_slot(struct active_request_slot *slot)
 645{
 646        active_requests--;
 647        slot->in_use = 0;
 648}
 649
 650static void release_active_slot(struct active_request_slot *slot)
 651{
 652        closedown_active_slot(slot);
 653        if (slot->curl && curl_session_count > min_curl_sessions) {
 654#ifdef USE_CURL_MULTI
 655                curl_multi_remove_handle(curlm, slot->curl);
 656#endif
 657                curl_easy_cleanup(slot->curl);
 658                slot->curl = NULL;
 659                curl_session_count--;
 660        }
 661#ifdef USE_CURL_MULTI
 662        fill_active_slots();
 663#endif
 664}
 665
 666void finish_active_slot(struct active_request_slot *slot)
 667{
 668        closedown_active_slot(slot);
 669        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 670
 671        if (slot->finished != NULL)
 672                (*slot->finished) = 1;
 673
 674        /* Store slot results so they can be read after the slot is reused */
 675        if (slot->results != NULL) {
 676                slot->results->curl_result = slot->curl_result;
 677                slot->results->http_code = slot->http_code;
 678        }
 679
 680        /* Run callback if appropriate */
 681        if (slot->callback_func != NULL)
 682                slot->callback_func(slot->callback_data);
 683}
 684
 685void finish_all_active_slots(void)
 686{
 687        struct active_request_slot *slot = active_queue_head;
 688
 689        while (slot != NULL)
 690                if (slot->in_use) {
 691                        run_active_slot(slot);
 692                        slot = active_queue_head;
 693                } else {
 694                        slot = slot->next;
 695                }
 696}
 697
 698/* Helpers for modifying and creating URLs */
 699static inline int needs_quote(int ch)
 700{
 701        if (((ch >= 'A') && (ch <= 'Z'))
 702                        || ((ch >= 'a') && (ch <= 'z'))
 703                        || ((ch >= '0') && (ch <= '9'))
 704                        || (ch == '/')
 705                        || (ch == '-')
 706                        || (ch == '.'))
 707                return 0;
 708        return 1;
 709}
 710
 711static char *quote_ref_url(const char *base, const char *ref)
 712{
 713        struct strbuf buf = STRBUF_INIT;
 714        const char *cp;
 715        int ch;
 716
 717        end_url_with_slash(&buf, base);
 718
 719        for (cp = ref; (ch = *cp) != 0; cp++)
 720                if (needs_quote(ch))
 721                        strbuf_addf(&buf, "%%%02x", ch);
 722                else
 723                        strbuf_addch(&buf, *cp);
 724
 725        return strbuf_detach(&buf, NULL);
 726}
 727
 728void append_remote_object_url(struct strbuf *buf, const char *url,
 729                              const char *hex,
 730                              int only_two_digit_prefix)
 731{
 732        end_url_with_slash(buf, url);
 733
 734        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 735        if (!only_two_digit_prefix)
 736                strbuf_addf(buf, "%s", hex+2);
 737}
 738
 739char *get_remote_object_url(const char *url, const char *hex,
 740                            int only_two_digit_prefix)
 741{
 742        struct strbuf buf = STRBUF_INIT;
 743        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 744        return strbuf_detach(&buf, NULL);
 745}
 746
 747int handle_curl_result(struct active_request_slot *slot,
 748                       struct slot_results *results)
 749{
 750        if (results->curl_result == CURLE_OK) {
 751                credential_approve(&http_auth);
 752                return HTTP_OK;
 753        } else if (missing_target(results))
 754                return HTTP_MISSING_TARGET;
 755        else if (results->http_code == 401) {
 756                if (http_auth.username && http_auth.password) {
 757                        credential_reject(&http_auth);
 758                        return HTTP_NOAUTH;
 759                } else {
 760                        credential_fill(&http_auth);
 761                        init_curl_http_auth(slot->curl);
 762                        return HTTP_REAUTH;
 763                }
 764        } else {
 765                if (!curl_errorstr[0])
 766                        strlcpy(curl_errorstr,
 767                                curl_easy_strerror(results->curl_result),
 768                                sizeof(curl_errorstr));
 769                return HTTP_ERROR;
 770        }
 771}
 772
 773/* http_request() targets */
 774#define HTTP_REQUEST_STRBUF     0
 775#define HTTP_REQUEST_FILE       1
 776
 777static int http_request(const char *url, void *result, int target, int options)
 778{
 779        struct active_request_slot *slot;
 780        struct slot_results results;
 781        struct curl_slist *headers = NULL;
 782        struct strbuf buf = STRBUF_INIT;
 783        int ret;
 784
 785        slot = get_active_slot();
 786        slot->results = &results;
 787        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 788
 789        if (result == NULL) {
 790                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 791        } else {
 792                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 793                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 794
 795                if (target == HTTP_REQUEST_FILE) {
 796                        long posn = ftell(result);
 797                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 798                                         fwrite);
 799                        if (posn > 0) {
 800                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 801                                headers = curl_slist_append(headers, buf.buf);
 802                                strbuf_reset(&buf);
 803                        }
 804                } else
 805                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 806                                         fwrite_buffer);
 807        }
 808
 809        strbuf_addstr(&buf, "Pragma:");
 810        if (options & HTTP_NO_CACHE)
 811                strbuf_addstr(&buf, " no-cache");
 812
 813        headers = curl_slist_append(headers, buf.buf);
 814
 815        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 816        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 817
 818        if (start_active_slot(slot)) {
 819                run_active_slot(slot);
 820                ret = handle_curl_result(slot, &results);
 821        } else {
 822                error("Unable to start HTTP request for %s", url);
 823                ret = HTTP_START_FAILED;
 824        }
 825
 826        curl_slist_free_all(headers);
 827        strbuf_release(&buf);
 828
 829        return ret;
 830}
 831
 832static int http_request_reauth(const char *url, void *result, int target,
 833                               int options)
 834{
 835        int ret = http_request(url, result, target, options);
 836        if (ret != HTTP_REAUTH)
 837                return ret;
 838        return http_request(url, result, target, options);
 839}
 840
 841int http_get_strbuf(const char *url, struct strbuf *result, int options)
 842{
 843        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
 844}
 845
 846/*
 847 * Downloads a URL and stores the result in the given file.
 848 *
 849 * If a previous interrupted download is detected (i.e. a previous temporary
 850 * file is still around) the download is resumed.
 851 */
 852static int http_get_file(const char *url, const char *filename, int options)
 853{
 854        int ret;
 855        struct strbuf tmpfile = STRBUF_INIT;
 856        FILE *result;
 857
 858        strbuf_addf(&tmpfile, "%s.temp", filename);
 859        result = fopen(tmpfile.buf, "a");
 860        if (! result) {
 861                error("Unable to open local file %s", tmpfile.buf);
 862                ret = HTTP_ERROR;
 863                goto cleanup;
 864        }
 865
 866        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
 867        fclose(result);
 868
 869        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 870                ret = HTTP_ERROR;
 871cleanup:
 872        strbuf_release(&tmpfile);
 873        return ret;
 874}
 875
 876int http_error(const char *url, int ret)
 877{
 878        /* http_request has already handled HTTP_START_FAILED. */
 879        if (ret != HTTP_START_FAILED)
 880                error("%s while accessing %s", curl_errorstr, url);
 881
 882        return ret;
 883}
 884
 885int http_fetch_ref(const char *base, struct ref *ref)
 886{
 887        char *url;
 888        struct strbuf buffer = STRBUF_INIT;
 889        int ret = -1;
 890
 891        url = quote_ref_url(base, ref->name);
 892        if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 893                strbuf_rtrim(&buffer);
 894                if (buffer.len == 40)
 895                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 896                else if (!prefixcmp(buffer.buf, "ref: ")) {
 897                        ref->symref = xstrdup(buffer.buf + 5);
 898                        ret = 0;
 899                }
 900        }
 901
 902        strbuf_release(&buffer);
 903        free(url);
 904        return ret;
 905}
 906
 907/* Helpers for fetching packs */
 908static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 909{
 910        char *url, *tmp;
 911        struct strbuf buf = STRBUF_INIT;
 912
 913        if (http_is_verbose)
 914                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 915
 916        end_url_with_slash(&buf, base_url);
 917        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 918        url = strbuf_detach(&buf, NULL);
 919
 920        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 921        tmp = strbuf_detach(&buf, NULL);
 922
 923        if (http_get_file(url, tmp, 0) != HTTP_OK) {
 924                error("Unable to get pack index %s\n", url);
 925                free(tmp);
 926                tmp = NULL;
 927        }
 928
 929        free(url);
 930        return tmp;
 931}
 932
 933static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 934        unsigned char *sha1, const char *base_url)
 935{
 936        struct packed_git *new_pack;
 937        char *tmp_idx = NULL;
 938        int ret;
 939
 940        if (has_pack_index(sha1)) {
 941                new_pack = parse_pack_index(sha1, NULL);
 942                if (!new_pack)
 943                        return -1; /* parse_pack_index() already issued error message */
 944                goto add_pack;
 945        }
 946
 947        tmp_idx = fetch_pack_index(sha1, base_url);
 948        if (!tmp_idx)
 949                return -1;
 950
 951        new_pack = parse_pack_index(sha1, tmp_idx);
 952        if (!new_pack) {
 953                unlink(tmp_idx);
 954                free(tmp_idx);
 955
 956                return -1; /* parse_pack_index() already issued error message */
 957        }
 958
 959        ret = verify_pack_index(new_pack);
 960        if (!ret) {
 961                close_pack_index(new_pack);
 962                ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
 963        }
 964        free(tmp_idx);
 965        if (ret)
 966                return -1;
 967
 968add_pack:
 969        new_pack->next = *packs_head;
 970        *packs_head = new_pack;
 971        return 0;
 972}
 973
 974int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 975{
 976        int ret = 0, i = 0;
 977        char *url, *data;
 978        struct strbuf buf = STRBUF_INIT;
 979        unsigned char sha1[20];
 980
 981        end_url_with_slash(&buf, base_url);
 982        strbuf_addstr(&buf, "objects/info/packs");
 983        url = strbuf_detach(&buf, NULL);
 984
 985        ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 986        if (ret != HTTP_OK)
 987                goto cleanup;
 988
 989        data = buf.buf;
 990        while (i < buf.len) {
 991                switch (data[i]) {
 992                case 'P':
 993                        i++;
 994                        if (i + 52 <= buf.len &&
 995                            !prefixcmp(data + i, " pack-") &&
 996                            !prefixcmp(data + i + 46, ".pack\n")) {
 997                                get_sha1_hex(data + i + 6, sha1);
 998                                fetch_and_setup_pack_index(packs_head, sha1,
 999                                                      base_url);
1000                                i += 51;
1001                                break;
1002                        }
1003                default:
1004                        while (i < buf.len && data[i] != '\n')
1005                                i++;
1006                }
1007                i++;
1008        }
1009
1010cleanup:
1011        free(url);
1012        return ret;
1013}
1014
1015void release_http_pack_request(struct http_pack_request *preq)
1016{
1017        if (preq->packfile != NULL) {
1018                fclose(preq->packfile);
1019                preq->packfile = NULL;
1020        }
1021        if (preq->range_header != NULL) {
1022                curl_slist_free_all(preq->range_header);
1023                preq->range_header = NULL;
1024        }
1025        preq->slot = NULL;
1026        free(preq->url);
1027}
1028
1029int finish_http_pack_request(struct http_pack_request *preq)
1030{
1031        struct packed_git **lst;
1032        struct packed_git *p = preq->target;
1033        char *tmp_idx;
1034        struct child_process ip;
1035        const char *ip_argv[8];
1036
1037        close_pack_index(p);
1038
1039        fclose(preq->packfile);
1040        preq->packfile = NULL;
1041
1042        lst = preq->lst;
1043        while (*lst != p)
1044                lst = &((*lst)->next);
1045        *lst = (*lst)->next;
1046
1047        tmp_idx = xstrdup(preq->tmpfile);
1048        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1049               ".idx.temp");
1050
1051        ip_argv[0] = "index-pack";
1052        ip_argv[1] = "-o";
1053        ip_argv[2] = tmp_idx;
1054        ip_argv[3] = preq->tmpfile;
1055        ip_argv[4] = NULL;
1056
1057        memset(&ip, 0, sizeof(ip));
1058        ip.argv = ip_argv;
1059        ip.git_cmd = 1;
1060        ip.no_stdin = 1;
1061        ip.no_stdout = 1;
1062
1063        if (run_command(&ip)) {
1064                unlink(preq->tmpfile);
1065                unlink(tmp_idx);
1066                free(tmp_idx);
1067                return -1;
1068        }
1069
1070        unlink(sha1_pack_index_name(p->sha1));
1071
1072        if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1073         || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1074                free(tmp_idx);
1075                return -1;
1076        }
1077
1078        install_packed_git(p);
1079        free(tmp_idx);
1080        return 0;
1081}
1082
1083struct http_pack_request *new_http_pack_request(
1084        struct packed_git *target, const char *base_url)
1085{
1086        long prev_posn = 0;
1087        char range[RANGE_HEADER_SIZE];
1088        struct strbuf buf = STRBUF_INIT;
1089        struct http_pack_request *preq;
1090
1091        preq = xcalloc(1, sizeof(*preq));
1092        preq->target = target;
1093
1094        end_url_with_slash(&buf, base_url);
1095        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1096                sha1_to_hex(target->sha1));
1097        preq->url = strbuf_detach(&buf, NULL);
1098
1099        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1100                sha1_pack_name(target->sha1));
1101        preq->packfile = fopen(preq->tmpfile, "a");
1102        if (!preq->packfile) {
1103                error("Unable to open local file %s for pack",
1104                      preq->tmpfile);
1105                goto abort;
1106        }
1107
1108        preq->slot = get_active_slot();
1109        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1110        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1111        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1112        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1113                no_pragma_header);
1114
1115        /*
1116         * If there is data present from a previous transfer attempt,
1117         * resume where it left off
1118         */
1119        prev_posn = ftell(preq->packfile);
1120        if (prev_posn>0) {
1121                if (http_is_verbose)
1122                        fprintf(stderr,
1123                                "Resuming fetch of pack %s at byte %ld\n",
1124                                sha1_to_hex(target->sha1), prev_posn);
1125                sprintf(range, "Range: bytes=%ld-", prev_posn);
1126                preq->range_header = curl_slist_append(NULL, range);
1127                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1128                        preq->range_header);
1129        }
1130
1131        return preq;
1132
1133abort:
1134        free(preq->url);
1135        free(preq);
1136        return NULL;
1137}
1138
1139/* Helpers for fetching objects (loose) */
1140static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1141                               void *data)
1142{
1143        unsigned char expn[4096];
1144        size_t size = eltsize * nmemb;
1145        int posn = 0;
1146        struct http_object_request *freq =
1147                (struct http_object_request *)data;
1148        do {
1149                ssize_t retval = xwrite(freq->localfile,
1150                                        (char *) ptr + posn, size - posn);
1151                if (retval < 0)
1152                        return posn;
1153                posn += retval;
1154        } while (posn < size);
1155
1156        freq->stream.avail_in = size;
1157        freq->stream.next_in = (void *)ptr;
1158        do {
1159                freq->stream.next_out = expn;
1160                freq->stream.avail_out = sizeof(expn);
1161                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1162                git_SHA1_Update(&freq->c, expn,
1163                                sizeof(expn) - freq->stream.avail_out);
1164        } while (freq->stream.avail_in && freq->zret == Z_OK);
1165        return size;
1166}
1167
1168struct http_object_request *new_http_object_request(const char *base_url,
1169        unsigned char *sha1)
1170{
1171        char *hex = sha1_to_hex(sha1);
1172        char *filename;
1173        char prevfile[PATH_MAX];
1174        int prevlocal;
1175        char prev_buf[PREV_BUF_SIZE];
1176        ssize_t prev_read = 0;
1177        long prev_posn = 0;
1178        char range[RANGE_HEADER_SIZE];
1179        struct curl_slist *range_header = NULL;
1180        struct http_object_request *freq;
1181
1182        freq = xcalloc(1, sizeof(*freq));
1183        hashcpy(freq->sha1, sha1);
1184        freq->localfile = -1;
1185
1186        filename = sha1_file_name(sha1);
1187        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1188                 "%s.temp", filename);
1189
1190        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1191        unlink_or_warn(prevfile);
1192        rename(freq->tmpfile, prevfile);
1193        unlink_or_warn(freq->tmpfile);
1194
1195        if (freq->localfile != -1)
1196                error("fd leakage in start: %d", freq->localfile);
1197        freq->localfile = open(freq->tmpfile,
1198                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1199        /*
1200         * This could have failed due to the "lazy directory creation";
1201         * try to mkdir the last path component.
1202         */
1203        if (freq->localfile < 0 && errno == ENOENT) {
1204                char *dir = strrchr(freq->tmpfile, '/');
1205                if (dir) {
1206                        *dir = 0;
1207                        mkdir(freq->tmpfile, 0777);
1208                        *dir = '/';
1209                }
1210                freq->localfile = open(freq->tmpfile,
1211                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1212        }
1213
1214        if (freq->localfile < 0) {
1215                error("Couldn't create temporary file %s: %s",
1216                      freq->tmpfile, strerror(errno));
1217                goto abort;
1218        }
1219
1220        git_inflate_init(&freq->stream);
1221
1222        git_SHA1_Init(&freq->c);
1223
1224        freq->url = get_remote_object_url(base_url, hex, 0);
1225
1226        /*
1227         * If a previous temp file is present, process what was already
1228         * fetched.
1229         */
1230        prevlocal = open(prevfile, O_RDONLY);
1231        if (prevlocal != -1) {
1232                do {
1233                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1234                        if (prev_read>0) {
1235                                if (fwrite_sha1_file(prev_buf,
1236                                                     1,
1237                                                     prev_read,
1238                                                     freq) == prev_read) {
1239                                        prev_posn += prev_read;
1240                                } else {
1241                                        prev_read = -1;
1242                                }
1243                        }
1244                } while (prev_read > 0);
1245                close(prevlocal);
1246        }
1247        unlink_or_warn(prevfile);
1248
1249        /*
1250         * Reset inflate/SHA1 if there was an error reading the previous temp
1251         * file; also rewind to the beginning of the local file.
1252         */
1253        if (prev_read == -1) {
1254                memset(&freq->stream, 0, sizeof(freq->stream));
1255                git_inflate_init(&freq->stream);
1256                git_SHA1_Init(&freq->c);
1257                if (prev_posn>0) {
1258                        prev_posn = 0;
1259                        lseek(freq->localfile, 0, SEEK_SET);
1260                        if (ftruncate(freq->localfile, 0) < 0) {
1261                                error("Couldn't truncate temporary file %s: %s",
1262                                          freq->tmpfile, strerror(errno));
1263                                goto abort;
1264                        }
1265                }
1266        }
1267
1268        freq->slot = get_active_slot();
1269
1270        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1271        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1272        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1273        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1274        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1275
1276        /*
1277         * If we have successfully processed data from a previous fetch
1278         * attempt, only fetch the data we don't already have.
1279         */
1280        if (prev_posn>0) {
1281                if (http_is_verbose)
1282                        fprintf(stderr,
1283                                "Resuming fetch of object %s at byte %ld\n",
1284                                hex, prev_posn);
1285                sprintf(range, "Range: bytes=%ld-", prev_posn);
1286                range_header = curl_slist_append(range_header, range);
1287                curl_easy_setopt(freq->slot->curl,
1288                                 CURLOPT_HTTPHEADER, range_header);
1289        }
1290
1291        return freq;
1292
1293abort:
1294        free(freq->url);
1295        free(freq);
1296        return NULL;
1297}
1298
1299void process_http_object_request(struct http_object_request *freq)
1300{
1301        if (freq->slot == NULL)
1302                return;
1303        freq->curl_result = freq->slot->curl_result;
1304        freq->http_code = freq->slot->http_code;
1305        freq->slot = NULL;
1306}
1307
1308int finish_http_object_request(struct http_object_request *freq)
1309{
1310        struct stat st;
1311
1312        close(freq->localfile);
1313        freq->localfile = -1;
1314
1315        process_http_object_request(freq);
1316
1317        if (freq->http_code == 416) {
1318                warning("requested range invalid; we may already have all the data.");
1319        } else if (freq->curl_result != CURLE_OK) {
1320                if (stat(freq->tmpfile, &st) == 0)
1321                        if (st.st_size == 0)
1322                                unlink_or_warn(freq->tmpfile);
1323                return -1;
1324        }
1325
1326        git_inflate_end(&freq->stream);
1327        git_SHA1_Final(freq->real_sha1, &freq->c);
1328        if (freq->zret != Z_STREAM_END) {
1329                unlink_or_warn(freq->tmpfile);
1330                return -1;
1331        }
1332        if (hashcmp(freq->sha1, freq->real_sha1)) {
1333                unlink_or_warn(freq->tmpfile);
1334                return -1;
1335        }
1336        freq->rename =
1337                move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1338
1339        return freq->rename;
1340}
1341
1342void abort_http_object_request(struct http_object_request *freq)
1343{
1344        unlink_or_warn(freq->tmpfile);
1345
1346        release_http_object_request(freq);
1347}
1348
1349void release_http_object_request(struct http_object_request *freq)
1350{
1351        if (freq->localfile != -1) {
1352                close(freq->localfile);
1353                freq->localfile = -1;
1354        }
1355        if (freq->url != NULL) {
1356                free(freq->url);
1357                freq->url = NULL;
1358        }
1359        if (freq->slot != NULL) {
1360                freq->slot->callback_func = NULL;
1361                freq->slot->callback_data = NULL;
1362                release_active_slot(freq->slot);
1363                freq->slot = NULL;
1364        }
1365}