Andrew's git / gitweb.git / http.c
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http.con commit Merge branch 'mg/rebase-i-onto-reflog-in-full' into maint-1.7.11 (73eb89e)
   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
 747/* http_request() targets */
 748#define HTTP_REQUEST_STRBUF     0
 749#define HTTP_REQUEST_FILE       1
 750
 751static int http_request(const char *url, void *result, int target, int options)
 752{
 753        struct active_request_slot *slot;
 754        struct slot_results results;
 755        struct curl_slist *headers = NULL;
 756        struct strbuf buf = STRBUF_INIT;
 757        int ret;
 758
 759        slot = get_active_slot();
 760        slot->results = &results;
 761        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 762
 763        if (result == NULL) {
 764                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 765        } else {
 766                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 767                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 768
 769                if (target == HTTP_REQUEST_FILE) {
 770                        long posn = ftell(result);
 771                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 772                                         fwrite);
 773                        if (posn > 0) {
 774                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 775                                headers = curl_slist_append(headers, buf.buf);
 776                                strbuf_reset(&buf);
 777                        }
 778                } else
 779                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 780                                         fwrite_buffer);
 781        }
 782
 783        strbuf_addstr(&buf, "Pragma:");
 784        if (options & HTTP_NO_CACHE)
 785                strbuf_addstr(&buf, " no-cache");
 786
 787        headers = curl_slist_append(headers, buf.buf);
 788
 789        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 790        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 791
 792        if (start_active_slot(slot)) {
 793                run_active_slot(slot);
 794                if (results.curl_result == CURLE_OK)
 795                        ret = HTTP_OK;
 796                else if (missing_target(&results))
 797                        ret = HTTP_MISSING_TARGET;
 798                else if (results.http_code == 401) {
 799                        if (http_auth.username && http_auth.password) {
 800                                credential_reject(&http_auth);
 801                                ret = HTTP_NOAUTH;
 802                        } else {
 803                                credential_fill(&http_auth);
 804                                init_curl_http_auth(slot->curl);
 805                                ret = HTTP_REAUTH;
 806                        }
 807                } else {
 808                        if (!curl_errorstr[0])
 809                                strlcpy(curl_errorstr,
 810                                        curl_easy_strerror(results.curl_result),
 811                                        sizeof(curl_errorstr));
 812                        ret = HTTP_ERROR;
 813                }
 814        } else {
 815                error("Unable to start HTTP request for %s", url);
 816                ret = HTTP_START_FAILED;
 817        }
 818
 819        curl_slist_free_all(headers);
 820        strbuf_release(&buf);
 821
 822        if (ret == HTTP_OK)
 823                credential_approve(&http_auth);
 824
 825        return ret;
 826}
 827
 828static int http_request_reauth(const char *url, void *result, int target,
 829                               int options)
 830{
 831        int ret = http_request(url, result, target, options);
 832        if (ret != HTTP_REAUTH)
 833                return ret;
 834        return http_request(url, result, target, options);
 835}
 836
 837int http_get_strbuf(const char *url, struct strbuf *result, int options)
 838{
 839        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
 840}
 841
 842/*
 843 * Downloads a URL and stores the result in the given file.
 844 *
 845 * If a previous interrupted download is detected (i.e. a previous temporary
 846 * file is still around) the download is resumed.
 847 */
 848static int http_get_file(const char *url, const char *filename, int options)
 849{
 850        int ret;
 851        struct strbuf tmpfile = STRBUF_INIT;
 852        FILE *result;
 853
 854        strbuf_addf(&tmpfile, "%s.temp", filename);
 855        result = fopen(tmpfile.buf, "a");
 856        if (! result) {
 857                error("Unable to open local file %s", tmpfile.buf);
 858                ret = HTTP_ERROR;
 859                goto cleanup;
 860        }
 861
 862        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
 863        fclose(result);
 864
 865        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 866                ret = HTTP_ERROR;
 867cleanup:
 868        strbuf_release(&tmpfile);
 869        return ret;
 870}
 871
 872int http_error(const char *url, int ret)
 873{
 874        /* http_request has already handled HTTP_START_FAILED. */
 875        if (ret != HTTP_START_FAILED)
 876                error("%s while accessing %s", curl_errorstr, url);
 877
 878        return ret;
 879}
 880
 881int http_fetch_ref(const char *base, struct ref *ref)
 882{
 883        char *url;
 884        struct strbuf buffer = STRBUF_INIT;
 885        int ret = -1;
 886
 887        url = quote_ref_url(base, ref->name);
 888        if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 889                strbuf_rtrim(&buffer);
 890                if (buffer.len == 40)
 891                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 892                else if (!prefixcmp(buffer.buf, "ref: ")) {
 893                        ref->symref = xstrdup(buffer.buf + 5);
 894                        ret = 0;
 895                }
 896        }
 897
 898        strbuf_release(&buffer);
 899        free(url);
 900        return ret;
 901}
 902
 903/* Helpers for fetching packs */
 904static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 905{
 906        char *url, *tmp;
 907        struct strbuf buf = STRBUF_INIT;
 908
 909        if (http_is_verbose)
 910                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 911
 912        end_url_with_slash(&buf, base_url);
 913        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 914        url = strbuf_detach(&buf, NULL);
 915
 916        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 917        tmp = strbuf_detach(&buf, NULL);
 918
 919        if (http_get_file(url, tmp, 0) != HTTP_OK) {
 920                error("Unable to get pack index %s", url);
 921                free(tmp);
 922                tmp = NULL;
 923        }
 924
 925        free(url);
 926        return tmp;
 927}
 928
 929static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 930        unsigned char *sha1, const char *base_url)
 931{
 932        struct packed_git *new_pack;
 933        char *tmp_idx = NULL;
 934        int ret;
 935
 936        if (has_pack_index(sha1)) {
 937                new_pack = parse_pack_index(sha1, NULL);
 938                if (!new_pack)
 939                        return -1; /* parse_pack_index() already issued error message */
 940                goto add_pack;
 941        }
 942
 943        tmp_idx = fetch_pack_index(sha1, base_url);
 944        if (!tmp_idx)
 945                return -1;
 946
 947        new_pack = parse_pack_index(sha1, tmp_idx);
 948        if (!new_pack) {
 949                unlink(tmp_idx);
 950                free(tmp_idx);
 951
 952                return -1; /* parse_pack_index() already issued error message */
 953        }
 954
 955        ret = verify_pack_index(new_pack);
 956        if (!ret) {
 957                close_pack_index(new_pack);
 958                ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
 959        }
 960        free(tmp_idx);
 961        if (ret)
 962                return -1;
 963
 964add_pack:
 965        new_pack->next = *packs_head;
 966        *packs_head = new_pack;
 967        return 0;
 968}
 969
 970int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 971{
 972        int ret = 0, i = 0;
 973        char *url, *data;
 974        struct strbuf buf = STRBUF_INIT;
 975        unsigned char sha1[20];
 976
 977        end_url_with_slash(&buf, base_url);
 978        strbuf_addstr(&buf, "objects/info/packs");
 979        url = strbuf_detach(&buf, NULL);
 980
 981        ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 982        if (ret != HTTP_OK)
 983                goto cleanup;
 984
 985        data = buf.buf;
 986        while (i < buf.len) {
 987                switch (data[i]) {
 988                case 'P':
 989                        i++;
 990                        if (i + 52 <= buf.len &&
 991                            !prefixcmp(data + i, " pack-") &&
 992                            !prefixcmp(data + i + 46, ".pack\n")) {
 993                                get_sha1_hex(data + i + 6, sha1);
 994                                fetch_and_setup_pack_index(packs_head, sha1,
 995                                                      base_url);
 996                                i += 51;
 997                                break;
 998                        }
 999                default:
1000                        while (i < buf.len && data[i] != '\n')
1001                                i++;
1002                }
1003                i++;
1004        }
1005
1006cleanup:
1007        free(url);
1008        return ret;
1009}
1010
1011void release_http_pack_request(struct http_pack_request *preq)
1012{
1013        if (preq->packfile != NULL) {
1014                fclose(preq->packfile);
1015                preq->packfile = NULL;
1016        }
1017        if (preq->range_header != NULL) {
1018                curl_slist_free_all(preq->range_header);
1019                preq->range_header = NULL;
1020        }
1021        preq->slot = NULL;
1022        free(preq->url);
1023}
1024
1025int finish_http_pack_request(struct http_pack_request *preq)
1026{
1027        struct packed_git **lst;
1028        struct packed_git *p = preq->target;
1029        char *tmp_idx;
1030        struct child_process ip;
1031        const char *ip_argv[8];
1032
1033        close_pack_index(p);
1034
1035        fclose(preq->packfile);
1036        preq->packfile = NULL;
1037
1038        lst = preq->lst;
1039        while (*lst != p)
1040                lst = &((*lst)->next);
1041        *lst = (*lst)->next;
1042
1043        tmp_idx = xstrdup(preq->tmpfile);
1044        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1045               ".idx.temp");
1046
1047        ip_argv[0] = "index-pack";
1048        ip_argv[1] = "-o";
1049        ip_argv[2] = tmp_idx;
1050        ip_argv[3] = preq->tmpfile;
1051        ip_argv[4] = NULL;
1052
1053        memset(&ip, 0, sizeof(ip));
1054        ip.argv = ip_argv;
1055        ip.git_cmd = 1;
1056        ip.no_stdin = 1;
1057        ip.no_stdout = 1;
1058
1059        if (run_command(&ip)) {
1060                unlink(preq->tmpfile);
1061                unlink(tmp_idx);
1062                free(tmp_idx);
1063                return -1;
1064        }
1065
1066        unlink(sha1_pack_index_name(p->sha1));
1067
1068        if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1069         || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1070                free(tmp_idx);
1071                return -1;
1072        }
1073
1074        install_packed_git(p);
1075        free(tmp_idx);
1076        return 0;
1077}
1078
1079struct http_pack_request *new_http_pack_request(
1080        struct packed_git *target, const char *base_url)
1081{
1082        long prev_posn = 0;
1083        char range[RANGE_HEADER_SIZE];
1084        struct strbuf buf = STRBUF_INIT;
1085        struct http_pack_request *preq;
1086
1087        preq = xcalloc(1, sizeof(*preq));
1088        preq->target = target;
1089
1090        end_url_with_slash(&buf, base_url);
1091        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1092                sha1_to_hex(target->sha1));
1093        preq->url = strbuf_detach(&buf, NULL);
1094
1095        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1096                sha1_pack_name(target->sha1));
1097        preq->packfile = fopen(preq->tmpfile, "a");
1098        if (!preq->packfile) {
1099                error("Unable to open local file %s for pack",
1100                      preq->tmpfile);
1101                goto abort;
1102        }
1103
1104        preq->slot = get_active_slot();
1105        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1106        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1107        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1108        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1109                no_pragma_header);
1110
1111        /*
1112         * If there is data present from a previous transfer attempt,
1113         * resume where it left off
1114         */
1115        prev_posn = ftell(preq->packfile);
1116        if (prev_posn>0) {
1117                if (http_is_verbose)
1118                        fprintf(stderr,
1119                                "Resuming fetch of pack %s at byte %ld\n",
1120                                sha1_to_hex(target->sha1), prev_posn);
1121                sprintf(range, "Range: bytes=%ld-", prev_posn);
1122                preq->range_header = curl_slist_append(NULL, range);
1123                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1124                        preq->range_header);
1125        }
1126
1127        return preq;
1128
1129abort:
1130        free(preq->url);
1131        free(preq);
1132        return NULL;
1133}
1134
1135/* Helpers for fetching objects (loose) */
1136static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1137                               void *data)
1138{
1139        unsigned char expn[4096];
1140        size_t size = eltsize * nmemb;
1141        int posn = 0;
1142        struct http_object_request *freq =
1143                (struct http_object_request *)data;
1144        do {
1145                ssize_t retval = xwrite(freq->localfile,
1146                                        (char *) ptr + posn, size - posn);
1147                if (retval < 0)
1148                        return posn;
1149                posn += retval;
1150        } while (posn < size);
1151
1152        freq->stream.avail_in = size;
1153        freq->stream.next_in = (void *)ptr;
1154        do {
1155                freq->stream.next_out = expn;
1156                freq->stream.avail_out = sizeof(expn);
1157                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1158                git_SHA1_Update(&freq->c, expn,
1159                                sizeof(expn) - freq->stream.avail_out);
1160        } while (freq->stream.avail_in && freq->zret == Z_OK);
1161        return size;
1162}
1163
1164struct http_object_request *new_http_object_request(const char *base_url,
1165        unsigned char *sha1)
1166{
1167        char *hex = sha1_to_hex(sha1);
1168        char *filename;
1169        char prevfile[PATH_MAX];
1170        int prevlocal;
1171        char prev_buf[PREV_BUF_SIZE];
1172        ssize_t prev_read = 0;
1173        long prev_posn = 0;
1174        char range[RANGE_HEADER_SIZE];
1175        struct curl_slist *range_header = NULL;
1176        struct http_object_request *freq;
1177
1178        freq = xcalloc(1, sizeof(*freq));
1179        hashcpy(freq->sha1, sha1);
1180        freq->localfile = -1;
1181
1182        filename = sha1_file_name(sha1);
1183        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1184                 "%s.temp", filename);
1185
1186        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1187        unlink_or_warn(prevfile);
1188        rename(freq->tmpfile, prevfile);
1189        unlink_or_warn(freq->tmpfile);
1190
1191        if (freq->localfile != -1)
1192                error("fd leakage in start: %d", freq->localfile);
1193        freq->localfile = open(freq->tmpfile,
1194                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1195        /*
1196         * This could have failed due to the "lazy directory creation";
1197         * try to mkdir the last path component.
1198         */
1199        if (freq->localfile < 0 && errno == ENOENT) {
1200                char *dir = strrchr(freq->tmpfile, '/');
1201                if (dir) {
1202                        *dir = 0;
1203                        mkdir(freq->tmpfile, 0777);
1204                        *dir = '/';
1205                }
1206                freq->localfile = open(freq->tmpfile,
1207                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1208        }
1209
1210        if (freq->localfile < 0) {
1211                error("Couldn't create temporary file %s: %s",
1212                      freq->tmpfile, strerror(errno));
1213                goto abort;
1214        }
1215
1216        git_inflate_init(&freq->stream);
1217
1218        git_SHA1_Init(&freq->c);
1219
1220        freq->url = get_remote_object_url(base_url, hex, 0);
1221
1222        /*
1223         * If a previous temp file is present, process what was already
1224         * fetched.
1225         */
1226        prevlocal = open(prevfile, O_RDONLY);
1227        if (prevlocal != -1) {
1228                do {
1229                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1230                        if (prev_read>0) {
1231                                if (fwrite_sha1_file(prev_buf,
1232                                                     1,
1233                                                     prev_read,
1234                                                     freq) == prev_read) {
1235                                        prev_posn += prev_read;
1236                                } else {
1237                                        prev_read = -1;
1238                                }
1239                        }
1240                } while (prev_read > 0);
1241                close(prevlocal);
1242        }
1243        unlink_or_warn(prevfile);
1244
1245        /*
1246         * Reset inflate/SHA1 if there was an error reading the previous temp
1247         * file; also rewind to the beginning of the local file.
1248         */
1249        if (prev_read == -1) {
1250                memset(&freq->stream, 0, sizeof(freq->stream));
1251                git_inflate_init(&freq->stream);
1252                git_SHA1_Init(&freq->c);
1253                if (prev_posn>0) {
1254                        prev_posn = 0;
1255                        lseek(freq->localfile, 0, SEEK_SET);
1256                        if (ftruncate(freq->localfile, 0) < 0) {
1257                                error("Couldn't truncate temporary file %s: %s",
1258                                          freq->tmpfile, strerror(errno));
1259                                goto abort;
1260                        }
1261                }
1262        }
1263
1264        freq->slot = get_active_slot();
1265
1266        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1267        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1268        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1269        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1270        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1271
1272        /*
1273         * If we have successfully processed data from a previous fetch
1274         * attempt, only fetch the data we don't already have.
1275         */
1276        if (prev_posn>0) {
1277                if (http_is_verbose)
1278                        fprintf(stderr,
1279                                "Resuming fetch of object %s at byte %ld\n",
1280                                hex, prev_posn);
1281                sprintf(range, "Range: bytes=%ld-", prev_posn);
1282                range_header = curl_slist_append(range_header, range);
1283                curl_easy_setopt(freq->slot->curl,
1284                                 CURLOPT_HTTPHEADER, range_header);
1285        }
1286
1287        return freq;
1288
1289abort:
1290        free(freq->url);
1291        free(freq);
1292        return NULL;
1293}
1294
1295void process_http_object_request(struct http_object_request *freq)
1296{
1297        if (freq->slot == NULL)
1298                return;
1299        freq->curl_result = freq->slot->curl_result;
1300        freq->http_code = freq->slot->http_code;
1301        freq->slot = NULL;
1302}
1303
1304int finish_http_object_request(struct http_object_request *freq)
1305{
1306        struct stat st;
1307
1308        close(freq->localfile);
1309        freq->localfile = -1;
1310
1311        process_http_object_request(freq);
1312
1313        if (freq->http_code == 416) {
1314                warning("requested range invalid; we may already have all the data.");
1315        } else if (freq->curl_result != CURLE_OK) {
1316                if (stat(freq->tmpfile, &st) == 0)
1317                        if (st.st_size == 0)
1318                                unlink_or_warn(freq->tmpfile);
1319                return -1;
1320        }
1321
1322        git_inflate_end(&freq->stream);
1323        git_SHA1_Final(freq->real_sha1, &freq->c);
1324        if (freq->zret != Z_STREAM_END) {
1325                unlink_or_warn(freq->tmpfile);
1326                return -1;
1327        }
1328        if (hashcmp(freq->sha1, freq->real_sha1)) {
1329                unlink_or_warn(freq->tmpfile);
1330                return -1;
1331        }
1332        freq->rename =
1333                move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1334
1335        return freq->rename;
1336}
1337
1338void abort_http_object_request(struct http_object_request *freq)
1339{
1340        unlink_or_warn(freq->tmpfile);
1341
1342        release_http_object_request(freq);
1343}
1344
1345void release_http_object_request(struct http_object_request *freq)
1346{
1347        if (freq->localfile != -1) {
1348                close(freq->localfile);
1349                freq->localfile = -1;
1350        }
1351        if (freq->url != NULL) {
1352                free(freq->url);
1353                freq->url = NULL;
1354        }
1355        if (freq->slot != NULL) {
1356                freq->slot->callback_func = NULL;
1357                freq->slot->callback_data = NULL;
1358                release_active_slot(freq->slot);
1359                freq->slot = NULL;
1360        }
1361}