Andrew's git / gitweb.git / http.c
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http.con commit pull: don't mark values for option "rebase" for translation (7306b39)
   1#include "git-compat-util.h"
   2#include "http.h"
   3#include "pack.h"
   4#include "sideband.h"
   5#include "run-command.h"
   6#include "url.h"
   7#include "urlmatch.h"
   8#include "credential.h"
   9#include "version.h"
  10#include "pkt-line.h"
  11#include "gettext.h"
  12
  13int active_requests;
  14int http_is_verbose;
  15size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  16
  17#if LIBCURL_VERSION_NUM >= 0x070a06
  18#define LIBCURL_CAN_HANDLE_AUTH_ANY
  19#endif
  20
  21static int min_curl_sessions = 1;
  22static int curl_session_count;
  23#ifdef USE_CURL_MULTI
  24static int max_requests = -1;
  25static CURLM *curlm;
  26#endif
  27#ifndef NO_CURL_EASY_DUPHANDLE
  28static CURL *curl_default;
  29#endif
  30
  31#define PREV_BUF_SIZE 4096
  32#define RANGE_HEADER_SIZE 30
  33
  34char curl_errorstr[CURL_ERROR_SIZE];
  35
  36static int curl_ssl_verify = -1;
  37static int curl_ssl_try;
  38static const char *ssl_cert;
  39static const char *ssl_cipherlist;
  40static const char *ssl_version;
  41static struct {
  42        const char *name;
  43        long ssl_version;
  44} sslversions[] = {
  45        { "sslv2", CURL_SSLVERSION_SSLv2 },
  46        { "sslv3", CURL_SSLVERSION_SSLv3 },
  47        { "tlsv1", CURL_SSLVERSION_TLSv1 },
  48#if LIBCURL_VERSION_NUM >= 0x072200
  49        { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  50        { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  51        { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  52#endif
  53};
  54#if LIBCURL_VERSION_NUM >= 0x070903
  55static const char *ssl_key;
  56#endif
  57#if LIBCURL_VERSION_NUM >= 0x070908
  58static const char *ssl_capath;
  59#endif
  60static const char *ssl_cainfo;
  61static long curl_low_speed_limit = -1;
  62static long curl_low_speed_time = -1;
  63static int curl_ftp_no_epsv;
  64static const char *curl_http_proxy;
  65static const char *curl_cookie_file;
  66static int curl_save_cookies;
  67struct credential http_auth = CREDENTIAL_INIT;
  68static int http_proactive_auth;
  69static const char *user_agent;
  70
  71#if LIBCURL_VERSION_NUM >= 0x071700
  72/* Use CURLOPT_KEYPASSWD as is */
  73#elif LIBCURL_VERSION_NUM >= 0x070903
  74#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  75#else
  76#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  77#endif
  78
  79static struct credential cert_auth = CREDENTIAL_INIT;
  80static int ssl_cert_password_required;
  81#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  82static unsigned long http_auth_methods = CURLAUTH_ANY;
  83#endif
  84
  85static struct curl_slist *pragma_header;
  86static struct curl_slist *no_pragma_header;
  87
  88static struct active_request_slot *active_queue_head;
  89
  90static char *cached_accept_language;
  91
  92size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  93{
  94        size_t size = eltsize * nmemb;
  95        struct buffer *buffer = buffer_;
  96
  97        if (size > buffer->buf.len - buffer->posn)
  98                size = buffer->buf.len - buffer->posn;
  99        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 100        buffer->posn += size;
 101
 102        return size;
 103}
 104
 105#ifndef NO_CURL_IOCTL
 106curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 107{
 108        struct buffer *buffer = clientp;
 109
 110        switch (cmd) {
 111        case CURLIOCMD_NOP:
 112                return CURLIOE_OK;
 113
 114        case CURLIOCMD_RESTARTREAD:
 115                buffer->posn = 0;
 116                return CURLIOE_OK;
 117
 118        default:
 119                return CURLIOE_UNKNOWNCMD;
 120        }
 121}
 122#endif
 123
 124size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 125{
 126        size_t size = eltsize * nmemb;
 127        struct strbuf *buffer = buffer_;
 128
 129        strbuf_add(buffer, ptr, size);
 130        return size;
 131}
 132
 133size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 134{
 135        return eltsize * nmemb;
 136}
 137
 138static void closedown_active_slot(struct active_request_slot *slot)
 139{
 140        active_requests--;
 141        slot->in_use = 0;
 142}
 143
 144static void finish_active_slot(struct active_request_slot *slot)
 145{
 146        closedown_active_slot(slot);
 147        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 148
 149        if (slot->finished != NULL)
 150                (*slot->finished) = 1;
 151
 152        /* Store slot results so they can be read after the slot is reused */
 153        if (slot->results != NULL) {
 154                slot->results->curl_result = slot->curl_result;
 155                slot->results->http_code = slot->http_code;
 156#if LIBCURL_VERSION_NUM >= 0x070a08
 157                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 158                                  &slot->results->auth_avail);
 159#else
 160                slot->results->auth_avail = 0;
 161#endif
 162        }
 163
 164        /* Run callback if appropriate */
 165        if (slot->callback_func != NULL)
 166                slot->callback_func(slot->callback_data);
 167}
 168
 169#ifdef USE_CURL_MULTI
 170static void process_curl_messages(void)
 171{
 172        int num_messages;
 173        struct active_request_slot *slot;
 174        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 175
 176        while (curl_message != NULL) {
 177                if (curl_message->msg == CURLMSG_DONE) {
 178                        int curl_result = curl_message->data.result;
 179                        slot = active_queue_head;
 180                        while (slot != NULL &&
 181                               slot->curl != curl_message->easy_handle)
 182                                slot = slot->next;
 183                        if (slot != NULL) {
 184                                curl_multi_remove_handle(curlm, slot->curl);
 185                                slot->curl_result = curl_result;
 186                                finish_active_slot(slot);
 187                        } else {
 188                                fprintf(stderr, "Received DONE message for unknown request!\n");
 189                        }
 190                } else {
 191                        fprintf(stderr, "Unknown CURL message received: %d\n",
 192                                (int)curl_message->msg);
 193                }
 194                curl_message = curl_multi_info_read(curlm, &num_messages);
 195        }
 196}
 197#endif
 198
 199static int http_options(const char *var, const char *value, void *cb)
 200{
 201        if (!strcmp("http.sslverify", var)) {
 202                curl_ssl_verify = git_config_bool(var, value);
 203                return 0;
 204        }
 205        if (!strcmp("http.sslcipherlist", var))
 206                return git_config_string(&ssl_cipherlist, var, value);
 207        if (!strcmp("http.sslversion", var))
 208                return git_config_string(&ssl_version, var, value);
 209        if (!strcmp("http.sslcert", var))
 210                return git_config_string(&ssl_cert, var, value);
 211#if LIBCURL_VERSION_NUM >= 0x070903
 212        if (!strcmp("http.sslkey", var))
 213                return git_config_string(&ssl_key, var, value);
 214#endif
 215#if LIBCURL_VERSION_NUM >= 0x070908
 216        if (!strcmp("http.sslcapath", var))
 217                return git_config_string(&ssl_capath, var, value);
 218#endif
 219        if (!strcmp("http.sslcainfo", var))
 220                return git_config_string(&ssl_cainfo, var, value);
 221        if (!strcmp("http.sslcertpasswordprotected", var)) {
 222                ssl_cert_password_required = git_config_bool(var, value);
 223                return 0;
 224        }
 225        if (!strcmp("http.ssltry", var)) {
 226                curl_ssl_try = git_config_bool(var, value);
 227                return 0;
 228        }
 229        if (!strcmp("http.minsessions", var)) {
 230                min_curl_sessions = git_config_int(var, value);
 231#ifndef USE_CURL_MULTI
 232                if (min_curl_sessions > 1)
 233                        min_curl_sessions = 1;
 234#endif
 235                return 0;
 236        }
 237#ifdef USE_CURL_MULTI
 238        if (!strcmp("http.maxrequests", var)) {
 239                max_requests = git_config_int(var, value);
 240                return 0;
 241        }
 242#endif
 243        if (!strcmp("http.lowspeedlimit", var)) {
 244                curl_low_speed_limit = (long)git_config_int(var, value);
 245                return 0;
 246        }
 247        if (!strcmp("http.lowspeedtime", var)) {
 248                curl_low_speed_time = (long)git_config_int(var, value);
 249                return 0;
 250        }
 251
 252        if (!strcmp("http.noepsv", var)) {
 253                curl_ftp_no_epsv = git_config_bool(var, value);
 254                return 0;
 255        }
 256        if (!strcmp("http.proxy", var))
 257                return git_config_string(&curl_http_proxy, var, value);
 258
 259        if (!strcmp("http.cookiefile", var))
 260                return git_config_string(&curl_cookie_file, var, value);
 261        if (!strcmp("http.savecookies", var)) {
 262                curl_save_cookies = git_config_bool(var, value);
 263                return 0;
 264        }
 265
 266        if (!strcmp("http.postbuffer", var)) {
 267                http_post_buffer = git_config_int(var, value);
 268                if (http_post_buffer < LARGE_PACKET_MAX)
 269                        http_post_buffer = LARGE_PACKET_MAX;
 270                return 0;
 271        }
 272
 273        if (!strcmp("http.useragent", var))
 274                return git_config_string(&user_agent, var, value);
 275
 276        /* Fall back on the default ones */
 277        return git_default_config(var, value, cb);
 278}
 279
 280static void init_curl_http_auth(CURL *result)
 281{
 282        if (!http_auth.username)
 283                return;
 284
 285        credential_fill(&http_auth);
 286
 287#if LIBCURL_VERSION_NUM >= 0x071301
 288        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 289        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 290#else
 291        {
 292                static struct strbuf up = STRBUF_INIT;
 293                /*
 294                 * Note that we assume we only ever have a single set of
 295                 * credentials in a given program run, so we do not have
 296                 * to worry about updating this buffer, only setting its
 297                 * initial value.
 298                 */
 299                if (!up.len)
 300                        strbuf_addf(&up, "%s:%s",
 301                                http_auth.username, http_auth.password);
 302                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 303        }
 304#endif
 305}
 306
 307static int has_cert_password(void)
 308{
 309        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 310                return 0;
 311        if (!cert_auth.password) {
 312                cert_auth.protocol = xstrdup("cert");
 313                cert_auth.username = xstrdup("");
 314                cert_auth.path = xstrdup(ssl_cert);
 315                credential_fill(&cert_auth);
 316        }
 317        return 1;
 318}
 319
 320#if LIBCURL_VERSION_NUM >= 0x071900
 321static void set_curl_keepalive(CURL *c)
 322{
 323        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 324}
 325
 326#elif LIBCURL_VERSION_NUM >= 0x071000
 327static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 328{
 329        int ka = 1;
 330        int rc;
 331        socklen_t len = (socklen_t)sizeof(ka);
 332
 333        if (type != CURLSOCKTYPE_IPCXN)
 334                return 0;
 335
 336        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 337        if (rc < 0)
 338                warning("unable to set SO_KEEPALIVE on socket %s",
 339                        strerror(errno));
 340
 341        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 342}
 343
 344static void set_curl_keepalive(CURL *c)
 345{
 346        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 347}
 348
 349#else
 350static void set_curl_keepalive(CURL *c)
 351{
 352        /* not supported on older curl versions */
 353}
 354#endif
 355
 356static CURL *get_curl_handle(void)
 357{
 358        CURL *result = curl_easy_init();
 359
 360        if (!result)
 361                die("curl_easy_init failed");
 362
 363        if (!curl_ssl_verify) {
 364                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 365                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 366        } else {
 367                /* Verify authenticity of the peer's certificate */
 368                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 369                /* The name in the cert must match whom we tried to connect */
 370                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 371        }
 372
 373#if LIBCURL_VERSION_NUM >= 0x070907
 374        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 375#endif
 376#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 377        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 378#endif
 379
 380        if (http_proactive_auth)
 381                init_curl_http_auth(result);
 382
 383        if (getenv("GIT_SSL_VERSION"))
 384                ssl_version = getenv("GIT_SSL_VERSION");
 385        if (ssl_version && *ssl_version) {
 386                int i;
 387                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 388                        if (!strcmp(ssl_version, sslversions[i].name)) {
 389                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 390                                                 sslversions[i].ssl_version);
 391                                break;
 392                        }
 393                }
 394                if (i == ARRAY_SIZE(sslversions))
 395                        warning("unsupported ssl version %s: using default",
 396                                ssl_version);
 397        }
 398
 399        if (getenv("GIT_SSL_CIPHER_LIST"))
 400                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 401        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 402                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 403                                ssl_cipherlist);
 404
 405        if (ssl_cert != NULL)
 406                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 407        if (has_cert_password())
 408                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 409#if LIBCURL_VERSION_NUM >= 0x070903
 410        if (ssl_key != NULL)
 411                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 412#endif
 413#if LIBCURL_VERSION_NUM >= 0x070908
 414        if (ssl_capath != NULL)
 415                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 416#endif
 417        if (ssl_cainfo != NULL)
 418                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 419
 420        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 421                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 422                                 curl_low_speed_limit);
 423                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 424                                 curl_low_speed_time);
 425        }
 426
 427        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 428#if LIBCURL_VERSION_NUM >= 0x071301
 429        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 430#elif LIBCURL_VERSION_NUM >= 0x071101
 431        curl_easy_setopt(result, CURLOPT_POST301, 1);
 432#endif
 433
 434        if (getenv("GIT_CURL_VERBOSE"))
 435                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 436
 437        curl_easy_setopt(result, CURLOPT_USERAGENT,
 438                user_agent ? user_agent : git_user_agent());
 439
 440        if (curl_ftp_no_epsv)
 441                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 442
 443#ifdef CURLOPT_USE_SSL
 444        if (curl_ssl_try)
 445                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 446#endif
 447
 448        if (curl_http_proxy) {
 449                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 450        }
 451#if LIBCURL_VERSION_NUM >= 0x070a07
 452        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 453#endif
 454
 455        set_curl_keepalive(result);
 456
 457        return result;
 458}
 459
 460static void set_from_env(const char **var, const char *envname)
 461{
 462        const char *val = getenv(envname);
 463        if (val)
 464                *var = val;
 465}
 466
 467void http_init(struct remote *remote, const char *url, int proactive_auth)
 468{
 469        char *low_speed_limit;
 470        char *low_speed_time;
 471        char *normalized_url;
 472        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 473
 474        config.section = "http";
 475        config.key = NULL;
 476        config.collect_fn = http_options;
 477        config.cascade_fn = git_default_config;
 478        config.cb = NULL;
 479
 480        http_is_verbose = 0;
 481        normalized_url = url_normalize(url, &config.url);
 482
 483        git_config(urlmatch_config_entry, &config);
 484        free(normalized_url);
 485
 486        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 487                die("curl_global_init failed");
 488
 489        http_proactive_auth = proactive_auth;
 490
 491        if (remote && remote->http_proxy)
 492                curl_http_proxy = xstrdup(remote->http_proxy);
 493
 494        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 495        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 496
 497#ifdef USE_CURL_MULTI
 498        {
 499                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 500                if (http_max_requests != NULL)
 501                        max_requests = atoi(http_max_requests);
 502        }
 503
 504        curlm = curl_multi_init();
 505        if (!curlm)
 506                die("curl_multi_init failed");
 507#endif
 508
 509        if (getenv("GIT_SSL_NO_VERIFY"))
 510                curl_ssl_verify = 0;
 511
 512        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 513#if LIBCURL_VERSION_NUM >= 0x070903
 514        set_from_env(&ssl_key, "GIT_SSL_KEY");
 515#endif
 516#if LIBCURL_VERSION_NUM >= 0x070908
 517        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 518#endif
 519        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 520
 521        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 522
 523        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 524        if (low_speed_limit != NULL)
 525                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 526        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 527        if (low_speed_time != NULL)
 528                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 529
 530        if (curl_ssl_verify == -1)
 531                curl_ssl_verify = 1;
 532
 533        curl_session_count = 0;
 534#ifdef USE_CURL_MULTI
 535        if (max_requests < 1)
 536                max_requests = DEFAULT_MAX_REQUESTS;
 537#endif
 538
 539        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 540                curl_ftp_no_epsv = 1;
 541
 542        if (url) {
 543                credential_from_url(&http_auth, url);
 544                if (!ssl_cert_password_required &&
 545                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 546                    starts_with(url, "https://"))
 547                        ssl_cert_password_required = 1;
 548        }
 549
 550#ifndef NO_CURL_EASY_DUPHANDLE
 551        curl_default = get_curl_handle();
 552#endif
 553}
 554
 555void http_cleanup(void)
 556{
 557        struct active_request_slot *slot = active_queue_head;
 558
 559        while (slot != NULL) {
 560                struct active_request_slot *next = slot->next;
 561                if (slot->curl != NULL) {
 562#ifdef USE_CURL_MULTI
 563                        curl_multi_remove_handle(curlm, slot->curl);
 564#endif
 565                        curl_easy_cleanup(slot->curl);
 566                }
 567                free(slot);
 568                slot = next;
 569        }
 570        active_queue_head = NULL;
 571
 572#ifndef NO_CURL_EASY_DUPHANDLE
 573        curl_easy_cleanup(curl_default);
 574#endif
 575
 576#ifdef USE_CURL_MULTI
 577        curl_multi_cleanup(curlm);
 578#endif
 579        curl_global_cleanup();
 580
 581        curl_slist_free_all(pragma_header);
 582        pragma_header = NULL;
 583
 584        curl_slist_free_all(no_pragma_header);
 585        no_pragma_header = NULL;
 586
 587        if (curl_http_proxy) {
 588                free((void *)curl_http_proxy);
 589                curl_http_proxy = NULL;
 590        }
 591
 592        if (cert_auth.password != NULL) {
 593                memset(cert_auth.password, 0, strlen(cert_auth.password));
 594                free(cert_auth.password);
 595                cert_auth.password = NULL;
 596        }
 597        ssl_cert_password_required = 0;
 598
 599        free(cached_accept_language);
 600        cached_accept_language = NULL;
 601}
 602
 603struct active_request_slot *get_active_slot(void)
 604{
 605        struct active_request_slot *slot = active_queue_head;
 606        struct active_request_slot *newslot;
 607
 608#ifdef USE_CURL_MULTI
 609        int num_transfers;
 610
 611        /* Wait for a slot to open up if the queue is full */
 612        while (active_requests >= max_requests) {
 613                curl_multi_perform(curlm, &num_transfers);
 614                if (num_transfers < active_requests)
 615                        process_curl_messages();
 616        }
 617#endif
 618
 619        while (slot != NULL && slot->in_use)
 620                slot = slot->next;
 621
 622        if (slot == NULL) {
 623                newslot = xmalloc(sizeof(*newslot));
 624                newslot->curl = NULL;
 625                newslot->in_use = 0;
 626                newslot->next = NULL;
 627
 628                slot = active_queue_head;
 629                if (slot == NULL) {
 630                        active_queue_head = newslot;
 631                } else {
 632                        while (slot->next != NULL)
 633                                slot = slot->next;
 634                        slot->next = newslot;
 635                }
 636                slot = newslot;
 637        }
 638
 639        if (slot->curl == NULL) {
 640#ifdef NO_CURL_EASY_DUPHANDLE
 641                slot->curl = get_curl_handle();
 642#else
 643                slot->curl = curl_easy_duphandle(curl_default);
 644#endif
 645                curl_session_count++;
 646        }
 647
 648        active_requests++;
 649        slot->in_use = 1;
 650        slot->results = NULL;
 651        slot->finished = NULL;
 652        slot->callback_data = NULL;
 653        slot->callback_func = NULL;
 654        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 655        if (curl_save_cookies)
 656                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 657        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 658        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 659        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 660        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 661        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 662        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 663        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 664        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 665        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 666#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 667        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 668#endif
 669        if (http_auth.password)
 670                init_curl_http_auth(slot->curl);
 671
 672        return slot;
 673}
 674
 675int start_active_slot(struct active_request_slot *slot)
 676{
 677#ifdef USE_CURL_MULTI
 678        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 679        int num_transfers;
 680
 681        if (curlm_result != CURLM_OK &&
 682            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 683                active_requests--;
 684                slot->in_use = 0;
 685                return 0;
 686        }
 687
 688        /*
 689         * We know there must be something to do, since we just added
 690         * something.
 691         */
 692        curl_multi_perform(curlm, &num_transfers);
 693#endif
 694        return 1;
 695}
 696
 697#ifdef USE_CURL_MULTI
 698struct fill_chain {
 699        void *data;
 700        int (*fill)(void *);
 701        struct fill_chain *next;
 702};
 703
 704static struct fill_chain *fill_cfg;
 705
 706void add_fill_function(void *data, int (*fill)(void *))
 707{
 708        struct fill_chain *new = xmalloc(sizeof(*new));
 709        struct fill_chain **linkp = &fill_cfg;
 710        new->data = data;
 711        new->fill = fill;
 712        new->next = NULL;
 713        while (*linkp)
 714                linkp = &(*linkp)->next;
 715        *linkp = new;
 716}
 717
 718void fill_active_slots(void)
 719{
 720        struct active_request_slot *slot = active_queue_head;
 721
 722        while (active_requests < max_requests) {
 723                struct fill_chain *fill;
 724                for (fill = fill_cfg; fill; fill = fill->next)
 725                        if (fill->fill(fill->data))
 726                                break;
 727
 728                if (!fill)
 729                        break;
 730        }
 731
 732        while (slot != NULL) {
 733                if (!slot->in_use && slot->curl != NULL
 734                        && curl_session_count > min_curl_sessions) {
 735                        curl_easy_cleanup(slot->curl);
 736                        slot->curl = NULL;
 737                        curl_session_count--;
 738                }
 739                slot = slot->next;
 740        }
 741}
 742
 743void step_active_slots(void)
 744{
 745        int num_transfers;
 746        CURLMcode curlm_result;
 747
 748        do {
 749                curlm_result = curl_multi_perform(curlm, &num_transfers);
 750        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 751        if (num_transfers < active_requests) {
 752                process_curl_messages();
 753                fill_active_slots();
 754        }
 755}
 756#endif
 757
 758void run_active_slot(struct active_request_slot *slot)
 759{
 760#ifdef USE_CURL_MULTI
 761        fd_set readfds;
 762        fd_set writefds;
 763        fd_set excfds;
 764        int max_fd;
 765        struct timeval select_timeout;
 766        int finished = 0;
 767
 768        slot->finished = &finished;
 769        while (!finished) {
 770                step_active_slots();
 771
 772                if (slot->in_use) {
 773#if LIBCURL_VERSION_NUM >= 0x070f04
 774                        long curl_timeout;
 775                        curl_multi_timeout(curlm, &curl_timeout);
 776                        if (curl_timeout == 0) {
 777                                continue;
 778                        } else if (curl_timeout == -1) {
 779                                select_timeout.tv_sec  = 0;
 780                                select_timeout.tv_usec = 50000;
 781                        } else {
 782                                select_timeout.tv_sec  =  curl_timeout / 1000;
 783                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 784                        }
 785#else
 786                        select_timeout.tv_sec  = 0;
 787                        select_timeout.tv_usec = 50000;
 788#endif
 789
 790                        max_fd = -1;
 791                        FD_ZERO(&readfds);
 792                        FD_ZERO(&writefds);
 793                        FD_ZERO(&excfds);
 794                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 795
 796                        /*
 797                         * It can happen that curl_multi_timeout returns a pathologically
 798                         * long timeout when curl_multi_fdset returns no file descriptors
 799                         * to read.  See commit message for more details.
 800                         */
 801                        if (max_fd < 0 &&
 802                            (select_timeout.tv_sec > 0 ||
 803                             select_timeout.tv_usec > 50000)) {
 804                                select_timeout.tv_sec  = 0;
 805                                select_timeout.tv_usec = 50000;
 806                        }
 807
 808                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 809                }
 810        }
 811#else
 812        while (slot->in_use) {
 813                slot->curl_result = curl_easy_perform(slot->curl);
 814                finish_active_slot(slot);
 815        }
 816#endif
 817}
 818
 819static void release_active_slot(struct active_request_slot *slot)
 820{
 821        closedown_active_slot(slot);
 822        if (slot->curl && curl_session_count > min_curl_sessions) {
 823#ifdef USE_CURL_MULTI
 824                curl_multi_remove_handle(curlm, slot->curl);
 825#endif
 826                curl_easy_cleanup(slot->curl);
 827                slot->curl = NULL;
 828                curl_session_count--;
 829        }
 830#ifdef USE_CURL_MULTI
 831        fill_active_slots();
 832#endif
 833}
 834
 835void finish_all_active_slots(void)
 836{
 837        struct active_request_slot *slot = active_queue_head;
 838
 839        while (slot != NULL)
 840                if (slot->in_use) {
 841                        run_active_slot(slot);
 842                        slot = active_queue_head;
 843                } else {
 844                        slot = slot->next;
 845                }
 846}
 847
 848/* Helpers for modifying and creating URLs */
 849static inline int needs_quote(int ch)
 850{
 851        if (((ch >= 'A') && (ch <= 'Z'))
 852                        || ((ch >= 'a') && (ch <= 'z'))
 853                        || ((ch >= '0') && (ch <= '9'))
 854                        || (ch == '/')
 855                        || (ch == '-')
 856                        || (ch == '.'))
 857                return 0;
 858        return 1;
 859}
 860
 861static char *quote_ref_url(const char *base, const char *ref)
 862{
 863        struct strbuf buf = STRBUF_INIT;
 864        const char *cp;
 865        int ch;
 866
 867        end_url_with_slash(&buf, base);
 868
 869        for (cp = ref; (ch = *cp) != 0; cp++)
 870                if (needs_quote(ch))
 871                        strbuf_addf(&buf, "%%%02x", ch);
 872                else
 873                        strbuf_addch(&buf, *cp);
 874
 875        return strbuf_detach(&buf, NULL);
 876}
 877
 878void append_remote_object_url(struct strbuf *buf, const char *url,
 879                              const char *hex,
 880                              int only_two_digit_prefix)
 881{
 882        end_url_with_slash(buf, url);
 883
 884        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 885        if (!only_two_digit_prefix)
 886                strbuf_addf(buf, "%s", hex+2);
 887}
 888
 889char *get_remote_object_url(const char *url, const char *hex,
 890                            int only_two_digit_prefix)
 891{
 892        struct strbuf buf = STRBUF_INIT;
 893        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 894        return strbuf_detach(&buf, NULL);
 895}
 896
 897static int handle_curl_result(struct slot_results *results)
 898{
 899        /*
 900         * If we see a failing http code with CURLE_OK, we have turned off
 901         * FAILONERROR (to keep the server's custom error response), and should
 902         * translate the code into failure here.
 903         */
 904        if (results->curl_result == CURLE_OK &&
 905            results->http_code >= 400) {
 906                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
 907                /*
 908                 * Normally curl will already have put the "reason phrase"
 909                 * from the server into curl_errorstr; unfortunately without
 910                 * FAILONERROR it is lost, so we can give only the numeric
 911                 * status code.
 912                 */
 913                snprintf(curl_errorstr, sizeof(curl_errorstr),
 914                         "The requested URL returned error: %ld",
 915                         results->http_code);
 916        }
 917
 918        if (results->curl_result == CURLE_OK) {
 919                credential_approve(&http_auth);
 920                return HTTP_OK;
 921        } else if (missing_target(results))
 922                return HTTP_MISSING_TARGET;
 923        else if (results->http_code == 401) {
 924                if (http_auth.username && http_auth.password) {
 925                        credential_reject(&http_auth);
 926                        return HTTP_NOAUTH;
 927                } else {
 928#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 929                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
 930#endif
 931                        return HTTP_REAUTH;
 932                }
 933        } else {
 934#if LIBCURL_VERSION_NUM >= 0x070c00
 935                if (!curl_errorstr[0])
 936                        strlcpy(curl_errorstr,
 937                                curl_easy_strerror(results->curl_result),
 938                                sizeof(curl_errorstr));
 939#endif
 940                return HTTP_ERROR;
 941        }
 942}
 943
 944int run_one_slot(struct active_request_slot *slot,
 945                 struct slot_results *results)
 946{
 947        slot->results = results;
 948        if (!start_active_slot(slot)) {
 949                snprintf(curl_errorstr, sizeof(curl_errorstr),
 950                         "failed to start HTTP request");
 951                return HTTP_START_FAILED;
 952        }
 953
 954        run_active_slot(slot);
 955        return handle_curl_result(results);
 956}
 957
 958static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
 959{
 960        char *ptr;
 961        CURLcode ret;
 962
 963        strbuf_reset(buf);
 964        ret = curl_easy_getinfo(curl, info, &ptr);
 965        if (!ret && ptr)
 966                strbuf_addstr(buf, ptr);
 967        return ret;
 968}
 969
 970/*
 971 * Check for and extract a content-type parameter. "raw"
 972 * should be positioned at the start of the potential
 973 * parameter, with any whitespace already removed.
 974 *
 975 * "name" is the name of the parameter. The value is appended
 976 * to "out".
 977 */
 978static int extract_param(const char *raw, const char *name,
 979                         struct strbuf *out)
 980{
 981        size_t len = strlen(name);
 982
 983        if (strncasecmp(raw, name, len))
 984                return -1;
 985        raw += len;
 986
 987        if (*raw != '=')
 988                return -1;
 989        raw++;
 990
 991        while (*raw && !isspace(*raw) && *raw != ';')
 992                strbuf_addch(out, *raw++);
 993        return 0;
 994}
 995
 996/*
 997 * Extract a normalized version of the content type, with any
 998 * spaces suppressed, all letters lowercased, and no trailing ";"
 999 * or parameters.
1000 *
1001 * Note that we will silently remove even invalid whitespace. For
1002 * example, "text / plain" is specifically forbidden by RFC 2616,
1003 * but "text/plain" is the only reasonable output, and this keeps
1004 * our code simple.
1005 *
1006 * If the "charset" argument is not NULL, store the value of any
1007 * charset parameter there.
1008 *
1009 * Example:
1010 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1011 *   "text / plain" -> "text/plain"
1012 */
1013static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1014                                 struct strbuf *charset)
1015{
1016        const char *p;
1017
1018        strbuf_reset(type);
1019        strbuf_grow(type, raw->len);
1020        for (p = raw->buf; *p; p++) {
1021                if (isspace(*p))
1022                        continue;
1023                if (*p == ';') {
1024                        p++;
1025                        break;
1026                }
1027                strbuf_addch(type, tolower(*p));
1028        }
1029
1030        if (!charset)
1031                return;
1032
1033        strbuf_reset(charset);
1034        while (*p) {
1035                while (isspace(*p) || *p == ';')
1036                        p++;
1037                if (!extract_param(p, "charset", charset))
1038                        return;
1039                while (*p && !isspace(*p))
1040                        p++;
1041        }
1042
1043        if (!charset->len && starts_with(type->buf, "text/"))
1044                strbuf_addstr(charset, "ISO-8859-1");
1045}
1046
1047static void write_accept_language(struct strbuf *buf)
1048{
1049        /*
1050         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1051         * that, q-value will be smaller than 0.001, the minimum q-value the
1052         * HTTP specification allows. See
1053         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1054         */
1055        const int MAX_DECIMAL_PLACES = 3;
1056        const int MAX_LANGUAGE_TAGS = 1000;
1057        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1058        char **language_tags = NULL;
1059        int num_langs = 0;
1060        const char *s = get_preferred_languages();
1061        int i;
1062        struct strbuf tag = STRBUF_INIT;
1063
1064        /* Don't add Accept-Language header if no language is preferred. */
1065        if (!s)
1066                return;
1067
1068        /*
1069         * Split the colon-separated string of preferred languages into
1070         * language_tags array.
1071         */
1072        do {
1073                /* collect language tag */
1074                for (; *s && (isalnum(*s) || *s == '_'); s++)
1075                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1076
1077                /* skip .codeset, @modifier and any other unnecessary parts */
1078                while (*s && *s != ':')
1079                        s++;
1080
1081                if (tag.len) {
1082                        num_langs++;
1083                        REALLOC_ARRAY(language_tags, num_langs);
1084                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1085                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1086                                break;
1087                }
1088        } while (*s++);
1089
1090        /* write Accept-Language header into buf */
1091        if (num_langs) {
1092                int last_buf_len = 0;
1093                int max_q;
1094                int decimal_places;
1095                char q_format[32];
1096
1097                /* add '*' */
1098                REALLOC_ARRAY(language_tags, num_langs + 1);
1099                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1100
1101                /* compute decimal_places */
1102                for (max_q = 1, decimal_places = 0;
1103                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1104                     decimal_places++, max_q *= 10)
1105                        ;
1106
1107                sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1108
1109                strbuf_addstr(buf, "Accept-Language: ");
1110
1111                for (i = 0; i < num_langs; i++) {
1112                        if (i > 0)
1113                                strbuf_addstr(buf, ", ");
1114
1115                        strbuf_addstr(buf, language_tags[i]);
1116
1117                        if (i > 0)
1118                                strbuf_addf(buf, q_format, max_q - i);
1119
1120                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1121                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1122                                break;
1123                        }
1124
1125                        last_buf_len = buf->len;
1126                }
1127        }
1128
1129        /* free language tags -- last one is a static '*' */
1130        for (i = 0; i < num_langs - 1; i++)
1131                free(language_tags[i]);
1132        free(language_tags);
1133}
1134
1135/*
1136 * Get an Accept-Language header which indicates user's preferred languages.
1137 *
1138 * Examples:
1139 *   LANGUAGE= -> ""
1140 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1141 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1142 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1143 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1144 *   LANGUAGE= LANG=C -> ""
1145 */
1146static const char *get_accept_language(void)
1147{
1148        if (!cached_accept_language) {
1149                struct strbuf buf = STRBUF_INIT;
1150                write_accept_language(&buf);
1151                if (buf.len > 0)
1152                        cached_accept_language = strbuf_detach(&buf, NULL);
1153        }
1154
1155        return cached_accept_language;
1156}
1157
1158/* http_request() targets */
1159#define HTTP_REQUEST_STRBUF     0
1160#define HTTP_REQUEST_FILE       1
1161
1162static int http_request(const char *url,
1163                        void *result, int target,
1164                        const struct http_get_options *options)
1165{
1166        struct active_request_slot *slot;
1167        struct slot_results results;
1168        struct curl_slist *headers = NULL;
1169        struct strbuf buf = STRBUF_INIT;
1170        const char *accept_language;
1171        int ret;
1172
1173        slot = get_active_slot();
1174        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1175
1176        if (result == NULL) {
1177                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1178        } else {
1179                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1180                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1181
1182                if (target == HTTP_REQUEST_FILE) {
1183                        long posn = ftell(result);
1184                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1185                                         fwrite);
1186                        if (posn > 0) {
1187                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1188                                headers = curl_slist_append(headers, buf.buf);
1189                                strbuf_reset(&buf);
1190                        }
1191                } else
1192                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1193                                         fwrite_buffer);
1194        }
1195
1196        accept_language = get_accept_language();
1197
1198        if (accept_language)
1199                headers = curl_slist_append(headers, accept_language);
1200
1201        strbuf_addstr(&buf, "Pragma:");
1202        if (options && options->no_cache)
1203                strbuf_addstr(&buf, " no-cache");
1204        if (options && options->keep_error)
1205                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1206
1207        headers = curl_slist_append(headers, buf.buf);
1208
1209        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1210        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1211        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1212
1213        ret = run_one_slot(slot, &results);
1214
1215        if (options && options->content_type) {
1216                struct strbuf raw = STRBUF_INIT;
1217                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1218                extract_content_type(&raw, options->content_type,
1219                                     options->charset);
1220                strbuf_release(&raw);
1221        }
1222
1223        if (options && options->effective_url)
1224                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1225                                options->effective_url);
1226
1227        curl_slist_free_all(headers);
1228        strbuf_release(&buf);
1229
1230        return ret;
1231}
1232
1233/*
1234 * Update the "base" url to a more appropriate value, as deduced by
1235 * redirects seen when requesting a URL starting with "url".
1236 *
1237 * The "asked" parameter is a URL that we asked curl to access, and must begin
1238 * with "base".
1239 *
1240 * The "got" parameter is the URL that curl reported to us as where we ended
1241 * up.
1242 *
1243 * Returns 1 if we updated the base url, 0 otherwise.
1244 *
1245 * Our basic strategy is to compare "base" and "asked" to find the bits
1246 * specific to our request. We then strip those bits off of "got" to yield the
1247 * new base. So for example, if our base is "http://example.com/foo.git",
1248 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1249 * with "https://other.example.com/foo.git/info/refs". We would want the
1250 * new URL to become "https://other.example.com/foo.git".
1251 *
1252 * Note that this assumes a sane redirect scheme. It's entirely possible
1253 * in the example above to end up at a URL that does not even end in
1254 * "info/refs".  In such a case we simply punt, as there is not much we can
1255 * do (and such a scheme is unlikely to represent a real git repository,
1256 * which means we are likely about to abort anyway).
1257 */
1258static int update_url_from_redirect(struct strbuf *base,
1259                                    const char *asked,
1260                                    const struct strbuf *got)
1261{
1262        const char *tail;
1263        size_t tail_len;
1264
1265        if (!strcmp(asked, got->buf))
1266                return 0;
1267
1268        if (!skip_prefix(asked, base->buf, &tail))
1269                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1270                    asked, base->buf);
1271
1272        tail_len = strlen(tail);
1273
1274        if (got->len < tail_len ||
1275            strcmp(tail, got->buf + got->len - tail_len))
1276                return 0; /* insane redirect scheme */
1277
1278        strbuf_reset(base);
1279        strbuf_add(base, got->buf, got->len - tail_len);
1280        return 1;
1281}
1282
1283static int http_request_reauth(const char *url,
1284                               void *result, int target,
1285                               struct http_get_options *options)
1286{
1287        int ret = http_request(url, result, target, options);
1288
1289        if (options && options->effective_url && options->base_url) {
1290                if (update_url_from_redirect(options->base_url,
1291                                             url, options->effective_url)) {
1292                        credential_from_url(&http_auth, options->base_url->buf);
1293                        url = options->effective_url->buf;
1294                }
1295        }
1296
1297        if (ret != HTTP_REAUTH)
1298                return ret;
1299
1300        /*
1301         * If we are using KEEP_ERROR, the previous request may have
1302         * put cruft into our output stream; we should clear it out before
1303         * making our next request. We only know how to do this for
1304         * the strbuf case, but that is enough to satisfy current callers.
1305         */
1306        if (options && options->keep_error) {
1307                switch (target) {
1308                case HTTP_REQUEST_STRBUF:
1309                        strbuf_reset(result);
1310                        break;
1311                default:
1312                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1313                }
1314        }
1315
1316        credential_fill(&http_auth);
1317
1318        return http_request(url, result, target, options);
1319}
1320
1321int http_get_strbuf(const char *url,
1322                    struct strbuf *result,
1323                    struct http_get_options *options)
1324{
1325        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1326}
1327
1328/*
1329 * Downloads a URL and stores the result in the given file.
1330 *
1331 * If a previous interrupted download is detected (i.e. a previous temporary
1332 * file is still around) the download is resumed.
1333 */
1334static int http_get_file(const char *url, const char *filename,
1335                         struct http_get_options *options)
1336{
1337        int ret;
1338        struct strbuf tmpfile = STRBUF_INIT;
1339        FILE *result;
1340
1341        strbuf_addf(&tmpfile, "%s.temp", filename);
1342        result = fopen(tmpfile.buf, "a");
1343        if (!result) {
1344                error("Unable to open local file %s", tmpfile.buf);
1345                ret = HTTP_ERROR;
1346                goto cleanup;
1347        }
1348
1349        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1350        fclose(result);
1351
1352        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1353                ret = HTTP_ERROR;
1354cleanup:
1355        strbuf_release(&tmpfile);
1356        return ret;
1357}
1358
1359int http_fetch_ref(const char *base, struct ref *ref)
1360{
1361        struct http_get_options options = {0};
1362        char *url;
1363        struct strbuf buffer = STRBUF_INIT;
1364        int ret = -1;
1365
1366        options.no_cache = 1;
1367
1368        url = quote_ref_url(base, ref->name);
1369        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1370                strbuf_rtrim(&buffer);
1371                if (buffer.len == 40)
1372                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1373                else if (starts_with(buffer.buf, "ref: ")) {
1374                        ref->symref = xstrdup(buffer.buf + 5);
1375                        ret = 0;
1376                }
1377        }
1378
1379        strbuf_release(&buffer);
1380        free(url);
1381        return ret;
1382}
1383
1384/* Helpers for fetching packs */
1385static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1386{
1387        char *url, *tmp;
1388        struct strbuf buf = STRBUF_INIT;
1389
1390        if (http_is_verbose)
1391                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1392
1393        end_url_with_slash(&buf, base_url);
1394        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1395        url = strbuf_detach(&buf, NULL);
1396
1397        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1398        tmp = strbuf_detach(&buf, NULL);
1399
1400        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1401                error("Unable to get pack index %s", url);
1402                free(tmp);
1403                tmp = NULL;
1404        }
1405
1406        free(url);
1407        return tmp;
1408}
1409
1410static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1411        unsigned char *sha1, const char *base_url)
1412{
1413        struct packed_git *new_pack;
1414        char *tmp_idx = NULL;
1415        int ret;
1416
1417        if (has_pack_index(sha1)) {
1418                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1419                if (!new_pack)
1420                        return -1; /* parse_pack_index() already issued error message */
1421                goto add_pack;
1422        }
1423
1424        tmp_idx = fetch_pack_index(sha1, base_url);
1425        if (!tmp_idx)
1426                return -1;
1427
1428        new_pack = parse_pack_index(sha1, tmp_idx);
1429        if (!new_pack) {
1430                unlink(tmp_idx);
1431                free(tmp_idx);
1432
1433                return -1; /* parse_pack_index() already issued error message */
1434        }
1435
1436        ret = verify_pack_index(new_pack);
1437        if (!ret) {
1438                close_pack_index(new_pack);
1439                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1440        }
1441        free(tmp_idx);
1442        if (ret)
1443                return -1;
1444
1445add_pack:
1446        new_pack->next = *packs_head;
1447        *packs_head = new_pack;
1448        return 0;
1449}
1450
1451int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1452{
1453        struct http_get_options options = {0};
1454        int ret = 0, i = 0;
1455        char *url, *data;
1456        struct strbuf buf = STRBUF_INIT;
1457        unsigned char sha1[20];
1458
1459        end_url_with_slash(&buf, base_url);
1460        strbuf_addstr(&buf, "objects/info/packs");
1461        url = strbuf_detach(&buf, NULL);
1462
1463        options.no_cache = 1;
1464        ret = http_get_strbuf(url, &buf, &options);
1465        if (ret != HTTP_OK)
1466                goto cleanup;
1467
1468        data = buf.buf;
1469        while (i < buf.len) {
1470                switch (data[i]) {
1471                case 'P':
1472                        i++;
1473                        if (i + 52 <= buf.len &&
1474                            starts_with(data + i, " pack-") &&
1475                            starts_with(data + i + 46, ".pack\n")) {
1476                                get_sha1_hex(data + i + 6, sha1);
1477                                fetch_and_setup_pack_index(packs_head, sha1,
1478                                                      base_url);
1479                                i += 51;
1480                                break;
1481                        }
1482                default:
1483                        while (i < buf.len && data[i] != '\n')
1484                                i++;
1485                }
1486                i++;
1487        }
1488
1489cleanup:
1490        free(url);
1491        return ret;
1492}
1493
1494void release_http_pack_request(struct http_pack_request *preq)
1495{
1496        if (preq->packfile != NULL) {
1497                fclose(preq->packfile);
1498                preq->packfile = NULL;
1499        }
1500        if (preq->range_header != NULL) {
1501                curl_slist_free_all(preq->range_header);
1502                preq->range_header = NULL;
1503        }
1504        preq->slot = NULL;
1505        free(preq->url);
1506        free(preq);
1507}
1508
1509int finish_http_pack_request(struct http_pack_request *preq)
1510{
1511        struct packed_git **lst;
1512        struct packed_git *p = preq->target;
1513        char *tmp_idx;
1514        struct child_process ip = CHILD_PROCESS_INIT;
1515        const char *ip_argv[8];
1516
1517        close_pack_index(p);
1518
1519        fclose(preq->packfile);
1520        preq->packfile = NULL;
1521
1522        lst = preq->lst;
1523        while (*lst != p)
1524                lst = &((*lst)->next);
1525        *lst = (*lst)->next;
1526
1527        tmp_idx = xstrdup(preq->tmpfile);
1528        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1529               ".idx.temp");
1530
1531        ip_argv[0] = "index-pack";
1532        ip_argv[1] = "-o";
1533        ip_argv[2] = tmp_idx;
1534        ip_argv[3] = preq->tmpfile;
1535        ip_argv[4] = NULL;
1536
1537        ip.argv = ip_argv;
1538        ip.git_cmd = 1;
1539        ip.no_stdin = 1;
1540        ip.no_stdout = 1;
1541
1542        if (run_command(&ip)) {
1543                unlink(preq->tmpfile);
1544                unlink(tmp_idx);
1545                free(tmp_idx);
1546                return -1;
1547        }
1548
1549        unlink(sha1_pack_index_name(p->sha1));
1550
1551        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1552         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1553                free(tmp_idx);
1554                return -1;
1555        }
1556
1557        install_packed_git(p);
1558        free(tmp_idx);
1559        return 0;
1560}
1561
1562struct http_pack_request *new_http_pack_request(
1563        struct packed_git *target, const char *base_url)
1564{
1565        long prev_posn = 0;
1566        char range[RANGE_HEADER_SIZE];
1567        struct strbuf buf = STRBUF_INIT;
1568        struct http_pack_request *preq;
1569
1570        preq = xcalloc(1, sizeof(*preq));
1571        preq->target = target;
1572
1573        end_url_with_slash(&buf, base_url);
1574        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1575                sha1_to_hex(target->sha1));
1576        preq->url = strbuf_detach(&buf, NULL);
1577
1578        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1579                sha1_pack_name(target->sha1));
1580        preq->packfile = fopen(preq->tmpfile, "a");
1581        if (!preq->packfile) {
1582                error("Unable to open local file %s for pack",
1583                      preq->tmpfile);
1584                goto abort;
1585        }
1586
1587        preq->slot = get_active_slot();
1588        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1589        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1590        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1591        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1592                no_pragma_header);
1593
1594        /*
1595         * If there is data present from a previous transfer attempt,
1596         * resume where it left off
1597         */
1598        prev_posn = ftell(preq->packfile);
1599        if (prev_posn>0) {
1600                if (http_is_verbose)
1601                        fprintf(stderr,
1602                                "Resuming fetch of pack %s at byte %ld\n",
1603                                sha1_to_hex(target->sha1), prev_posn);
1604                sprintf(range, "Range: bytes=%ld-", prev_posn);
1605                preq->range_header = curl_slist_append(NULL, range);
1606                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1607                        preq->range_header);
1608        }
1609
1610        return preq;
1611
1612abort:
1613        free(preq->url);
1614        free(preq);
1615        return NULL;
1616}
1617
1618/* Helpers for fetching objects (loose) */
1619static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1620                               void *data)
1621{
1622        unsigned char expn[4096];
1623        size_t size = eltsize * nmemb;
1624        int posn = 0;
1625        struct http_object_request *freq =
1626                (struct http_object_request *)data;
1627        do {
1628                ssize_t retval = xwrite(freq->localfile,
1629                                        (char *) ptr + posn, size - posn);
1630                if (retval < 0)
1631                        return posn;
1632                posn += retval;
1633        } while (posn < size);
1634
1635        freq->stream.avail_in = size;
1636        freq->stream.next_in = (void *)ptr;
1637        do {
1638                freq->stream.next_out = expn;
1639                freq->stream.avail_out = sizeof(expn);
1640                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1641                git_SHA1_Update(&freq->c, expn,
1642                                sizeof(expn) - freq->stream.avail_out);
1643        } while (freq->stream.avail_in && freq->zret == Z_OK);
1644        return size;
1645}
1646
1647struct http_object_request *new_http_object_request(const char *base_url,
1648        unsigned char *sha1)
1649{
1650        char *hex = sha1_to_hex(sha1);
1651        const char *filename;
1652        char prevfile[PATH_MAX];
1653        int prevlocal;
1654        char prev_buf[PREV_BUF_SIZE];
1655        ssize_t prev_read = 0;
1656        long prev_posn = 0;
1657        char range[RANGE_HEADER_SIZE];
1658        struct curl_slist *range_header = NULL;
1659        struct http_object_request *freq;
1660
1661        freq = xcalloc(1, sizeof(*freq));
1662        hashcpy(freq->sha1, sha1);
1663        freq->localfile = -1;
1664
1665        filename = sha1_file_name(sha1);
1666        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1667                 "%s.temp", filename);
1668
1669        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1670        unlink_or_warn(prevfile);
1671        rename(freq->tmpfile, prevfile);
1672        unlink_or_warn(freq->tmpfile);
1673
1674        if (freq->localfile != -1)
1675                error("fd leakage in start: %d", freq->localfile);
1676        freq->localfile = open(freq->tmpfile,
1677                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1678        /*
1679         * This could have failed due to the "lazy directory creation";
1680         * try to mkdir the last path component.
1681         */
1682        if (freq->localfile < 0 && errno == ENOENT) {
1683                char *dir = strrchr(freq->tmpfile, '/');
1684                if (dir) {
1685                        *dir = 0;
1686                        mkdir(freq->tmpfile, 0777);
1687                        *dir = '/';
1688                }
1689                freq->localfile = open(freq->tmpfile,
1690                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1691        }
1692
1693        if (freq->localfile < 0) {
1694                error("Couldn't create temporary file %s: %s",
1695                      freq->tmpfile, strerror(errno));
1696                goto abort;
1697        }
1698
1699        git_inflate_init(&freq->stream);
1700
1701        git_SHA1_Init(&freq->c);
1702
1703        freq->url = get_remote_object_url(base_url, hex, 0);
1704
1705        /*
1706         * If a previous temp file is present, process what was already
1707         * fetched.
1708         */
1709        prevlocal = open(prevfile, O_RDONLY);
1710        if (prevlocal != -1) {
1711                do {
1712                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1713                        if (prev_read>0) {
1714                                if (fwrite_sha1_file(prev_buf,
1715                                                     1,
1716                                                     prev_read,
1717                                                     freq) == prev_read) {
1718                                        prev_posn += prev_read;
1719                                } else {
1720                                        prev_read = -1;
1721                                }
1722                        }
1723                } while (prev_read > 0);
1724                close(prevlocal);
1725        }
1726        unlink_or_warn(prevfile);
1727
1728        /*
1729         * Reset inflate/SHA1 if there was an error reading the previous temp
1730         * file; also rewind to the beginning of the local file.
1731         */
1732        if (prev_read == -1) {
1733                memset(&freq->stream, 0, sizeof(freq->stream));
1734                git_inflate_init(&freq->stream);
1735                git_SHA1_Init(&freq->c);
1736                if (prev_posn>0) {
1737                        prev_posn = 0;
1738                        lseek(freq->localfile, 0, SEEK_SET);
1739                        if (ftruncate(freq->localfile, 0) < 0) {
1740                                error("Couldn't truncate temporary file %s: %s",
1741                                          freq->tmpfile, strerror(errno));
1742                                goto abort;
1743                        }
1744                }
1745        }
1746
1747        freq->slot = get_active_slot();
1748
1749        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1750        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1751        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1752        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1753        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1754
1755        /*
1756         * If we have successfully processed data from a previous fetch
1757         * attempt, only fetch the data we don't already have.
1758         */
1759        if (prev_posn>0) {
1760                if (http_is_verbose)
1761                        fprintf(stderr,
1762                                "Resuming fetch of object %s at byte %ld\n",
1763                                hex, prev_posn);
1764                sprintf(range, "Range: bytes=%ld-", prev_posn);
1765                range_header = curl_slist_append(range_header, range);
1766                curl_easy_setopt(freq->slot->curl,
1767                                 CURLOPT_HTTPHEADER, range_header);
1768        }
1769
1770        return freq;
1771
1772abort:
1773        free(freq->url);
1774        free(freq);
1775        return NULL;
1776}
1777
1778void process_http_object_request(struct http_object_request *freq)
1779{
1780        if (freq->slot == NULL)
1781                return;
1782        freq->curl_result = freq->slot->curl_result;
1783        freq->http_code = freq->slot->http_code;
1784        freq->slot = NULL;
1785}
1786
1787int finish_http_object_request(struct http_object_request *freq)
1788{
1789        struct stat st;
1790
1791        close(freq->localfile);
1792        freq->localfile = -1;
1793
1794        process_http_object_request(freq);
1795
1796        if (freq->http_code == 416) {
1797                warning("requested range invalid; we may already have all the data.");
1798        } else if (freq->curl_result != CURLE_OK) {
1799                if (stat(freq->tmpfile, &st) == 0)
1800                        if (st.st_size == 0)
1801                                unlink_or_warn(freq->tmpfile);
1802                return -1;
1803        }
1804
1805        git_inflate_end(&freq->stream);
1806        git_SHA1_Final(freq->real_sha1, &freq->c);
1807        if (freq->zret != Z_STREAM_END) {
1808                unlink_or_warn(freq->tmpfile);
1809                return -1;
1810        }
1811        if (hashcmp(freq->sha1, freq->real_sha1)) {
1812                unlink_or_warn(freq->tmpfile);
1813                return -1;
1814        }
1815        freq->rename =
1816                finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1817
1818        return freq->rename;
1819}
1820
1821void abort_http_object_request(struct http_object_request *freq)
1822{
1823        unlink_or_warn(freq->tmpfile);
1824
1825        release_http_object_request(freq);
1826}
1827
1828void release_http_object_request(struct http_object_request *freq)
1829{
1830        if (freq->localfile != -1) {
1831                close(freq->localfile);
1832                freq->localfile = -1;
1833        }
1834        if (freq->url != NULL) {
1835                free(freq->url);
1836                freq->url = NULL;
1837        }
1838        if (freq->slot != NULL) {
1839                freq->slot->callback_func = NULL;
1840                freq->slot->callback_data = NULL;
1841                release_active_slot(freq->slot);
1842                freq->slot = NULL;
1843        }
1844}