Andrew's git / gitweb.git / http.c
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http.con commit wt-status.c: set commitable bit if there is a meaningful merge. (8dc874b)
   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#include "transport.h"
  13
  14int active_requests;
  15int http_is_verbose;
  16size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  17
  18#if LIBCURL_VERSION_NUM >= 0x070a06
  19#define LIBCURL_CAN_HANDLE_AUTH_ANY
  20#endif
  21
  22static int min_curl_sessions = 1;
  23static int curl_session_count;
  24#ifdef USE_CURL_MULTI
  25static int max_requests = -1;
  26static CURLM *curlm;
  27#endif
  28#ifndef NO_CURL_EASY_DUPHANDLE
  29static CURL *curl_default;
  30#endif
  31
  32#define PREV_BUF_SIZE 4096
  33#define RANGE_HEADER_SIZE 30
  34
  35char curl_errorstr[CURL_ERROR_SIZE];
  36
  37static int curl_ssl_verify = -1;
  38static int curl_ssl_try;
  39static const char *ssl_cert;
  40#if LIBCURL_VERSION_NUM >= 0x070903
  41static const char *ssl_key;
  42#endif
  43#if LIBCURL_VERSION_NUM >= 0x070908
  44static const char *ssl_capath;
  45#endif
  46static const char *ssl_cainfo;
  47static long curl_low_speed_limit = -1;
  48static long curl_low_speed_time = -1;
  49static int curl_ftp_no_epsv;
  50static const char *curl_http_proxy;
  51static const char *curl_cookie_file;
  52static int curl_save_cookies;
  53struct credential http_auth = CREDENTIAL_INIT;
  54static int http_proactive_auth;
  55static const char *user_agent;
  56
  57#if LIBCURL_VERSION_NUM >= 0x071700
  58/* Use CURLOPT_KEYPASSWD as is */
  59#elif LIBCURL_VERSION_NUM >= 0x070903
  60#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  61#else
  62#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  63#endif
  64
  65static struct credential cert_auth = CREDENTIAL_INIT;
  66static int ssl_cert_password_required;
  67#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  68static unsigned long http_auth_methods = CURLAUTH_ANY;
  69#endif
  70
  71static struct curl_slist *pragma_header;
  72static struct curl_slist *no_pragma_header;
  73
  74static struct active_request_slot *active_queue_head;
  75
  76static char *cached_accept_language;
  77
  78size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  79{
  80        size_t size = eltsize * nmemb;
  81        struct buffer *buffer = buffer_;
  82
  83        if (size > buffer->buf.len - buffer->posn)
  84                size = buffer->buf.len - buffer->posn;
  85        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  86        buffer->posn += size;
  87
  88        return size;
  89}
  90
  91#ifndef NO_CURL_IOCTL
  92curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  93{
  94        struct buffer *buffer = clientp;
  95
  96        switch (cmd) {
  97        case CURLIOCMD_NOP:
  98                return CURLIOE_OK;
  99
 100        case CURLIOCMD_RESTARTREAD:
 101                buffer->posn = 0;
 102                return CURLIOE_OK;
 103
 104        default:
 105                return CURLIOE_UNKNOWNCMD;
 106        }
 107}
 108#endif
 109
 110size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 111{
 112        size_t size = eltsize * nmemb;
 113        struct strbuf *buffer = buffer_;
 114
 115        strbuf_add(buffer, ptr, size);
 116        return size;
 117}
 118
 119size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 120{
 121        return eltsize * nmemb;
 122}
 123
 124static void closedown_active_slot(struct active_request_slot *slot)
 125{
 126        active_requests--;
 127        slot->in_use = 0;
 128}
 129
 130static void finish_active_slot(struct active_request_slot *slot)
 131{
 132        closedown_active_slot(slot);
 133        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 134
 135        if (slot->finished != NULL)
 136                (*slot->finished) = 1;
 137
 138        /* Store slot results so they can be read after the slot is reused */
 139        if (slot->results != NULL) {
 140                slot->results->curl_result = slot->curl_result;
 141                slot->results->http_code = slot->http_code;
 142#if LIBCURL_VERSION_NUM >= 0x070a08
 143                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 144                                  &slot->results->auth_avail);
 145#else
 146                slot->results->auth_avail = 0;
 147#endif
 148        }
 149
 150        /* Run callback if appropriate */
 151        if (slot->callback_func != NULL)
 152                slot->callback_func(slot->callback_data);
 153}
 154
 155#ifdef USE_CURL_MULTI
 156static void process_curl_messages(void)
 157{
 158        int num_messages;
 159        struct active_request_slot *slot;
 160        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 161
 162        while (curl_message != NULL) {
 163                if (curl_message->msg == CURLMSG_DONE) {
 164                        int curl_result = curl_message->data.result;
 165                        slot = active_queue_head;
 166                        while (slot != NULL &&
 167                               slot->curl != curl_message->easy_handle)
 168                                slot = slot->next;
 169                        if (slot != NULL) {
 170                                curl_multi_remove_handle(curlm, slot->curl);
 171                                slot->curl_result = curl_result;
 172                                finish_active_slot(slot);
 173                        } else {
 174                                fprintf(stderr, "Received DONE message for unknown request!\n");
 175                        }
 176                } else {
 177                        fprintf(stderr, "Unknown CURL message received: %d\n",
 178                                (int)curl_message->msg);
 179                }
 180                curl_message = curl_multi_info_read(curlm, &num_messages);
 181        }
 182}
 183#endif
 184
 185static int http_options(const char *var, const char *value, void *cb)
 186{
 187        if (!strcmp("http.sslverify", var)) {
 188                curl_ssl_verify = git_config_bool(var, value);
 189                return 0;
 190        }
 191        if (!strcmp("http.sslcert", var))
 192                return git_config_string(&ssl_cert, var, value);
 193#if LIBCURL_VERSION_NUM >= 0x070903
 194        if (!strcmp("http.sslkey", var))
 195                return git_config_string(&ssl_key, var, value);
 196#endif
 197#if LIBCURL_VERSION_NUM >= 0x070908
 198        if (!strcmp("http.sslcapath", var))
 199                return git_config_string(&ssl_capath, var, value);
 200#endif
 201        if (!strcmp("http.sslcainfo", var))
 202                return git_config_string(&ssl_cainfo, var, value);
 203        if (!strcmp("http.sslcertpasswordprotected", var)) {
 204                ssl_cert_password_required = git_config_bool(var, value);
 205                return 0;
 206        }
 207        if (!strcmp("http.ssltry", var)) {
 208                curl_ssl_try = git_config_bool(var, value);
 209                return 0;
 210        }
 211        if (!strcmp("http.minsessions", var)) {
 212                min_curl_sessions = git_config_int(var, value);
 213#ifndef USE_CURL_MULTI
 214                if (min_curl_sessions > 1)
 215                        min_curl_sessions = 1;
 216#endif
 217                return 0;
 218        }
 219#ifdef USE_CURL_MULTI
 220        if (!strcmp("http.maxrequests", var)) {
 221                max_requests = git_config_int(var, value);
 222                return 0;
 223        }
 224#endif
 225        if (!strcmp("http.lowspeedlimit", var)) {
 226                curl_low_speed_limit = (long)git_config_int(var, value);
 227                return 0;
 228        }
 229        if (!strcmp("http.lowspeedtime", var)) {
 230                curl_low_speed_time = (long)git_config_int(var, value);
 231                return 0;
 232        }
 233
 234        if (!strcmp("http.noepsv", var)) {
 235                curl_ftp_no_epsv = git_config_bool(var, value);
 236                return 0;
 237        }
 238        if (!strcmp("http.proxy", var))
 239                return git_config_string(&curl_http_proxy, var, value);
 240
 241        if (!strcmp("http.cookiefile", var))
 242                return git_config_string(&curl_cookie_file, var, value);
 243        if (!strcmp("http.savecookies", var)) {
 244                curl_save_cookies = git_config_bool(var, value);
 245                return 0;
 246        }
 247
 248        if (!strcmp("http.postbuffer", var)) {
 249                http_post_buffer = git_config_int(var, value);
 250                if (http_post_buffer < LARGE_PACKET_MAX)
 251                        http_post_buffer = LARGE_PACKET_MAX;
 252                return 0;
 253        }
 254
 255        if (!strcmp("http.useragent", var))
 256                return git_config_string(&user_agent, var, value);
 257
 258        /* Fall back on the default ones */
 259        return git_default_config(var, value, cb);
 260}
 261
 262static void init_curl_http_auth(CURL *result)
 263{
 264        if (!http_auth.username)
 265                return;
 266
 267        credential_fill(&http_auth);
 268
 269#if LIBCURL_VERSION_NUM >= 0x071301
 270        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 271        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 272#else
 273        {
 274                static struct strbuf up = STRBUF_INIT;
 275                /*
 276                 * Note that we assume we only ever have a single set of
 277                 * credentials in a given program run, so we do not have
 278                 * to worry about updating this buffer, only setting its
 279                 * initial value.
 280                 */
 281                if (!up.len)
 282                        strbuf_addf(&up, "%s:%s",
 283                                http_auth.username, http_auth.password);
 284                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 285        }
 286#endif
 287}
 288
 289static int has_cert_password(void)
 290{
 291        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 292                return 0;
 293        if (!cert_auth.password) {
 294                cert_auth.protocol = xstrdup("cert");
 295                cert_auth.username = xstrdup("");
 296                cert_auth.path = xstrdup(ssl_cert);
 297                credential_fill(&cert_auth);
 298        }
 299        return 1;
 300}
 301
 302#if LIBCURL_VERSION_NUM >= 0x071900
 303static void set_curl_keepalive(CURL *c)
 304{
 305        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 306}
 307
 308#elif LIBCURL_VERSION_NUM >= 0x071000
 309static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 310{
 311        int ka = 1;
 312        int rc;
 313        socklen_t len = (socklen_t)sizeof(ka);
 314
 315        if (type != CURLSOCKTYPE_IPCXN)
 316                return 0;
 317
 318        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 319        if (rc < 0)
 320                warning("unable to set SO_KEEPALIVE on socket %s",
 321                        strerror(errno));
 322
 323        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 324}
 325
 326static void set_curl_keepalive(CURL *c)
 327{
 328        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 329}
 330
 331#else
 332static void set_curl_keepalive(CURL *c)
 333{
 334        /* not supported on older curl versions */
 335}
 336#endif
 337
 338static CURL *get_curl_handle(void)
 339{
 340        CURL *result = curl_easy_init();
 341        long allowed_protocols = 0;
 342
 343        if (!result)
 344                die("curl_easy_init failed");
 345
 346        if (!curl_ssl_verify) {
 347                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 348                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 349        } else {
 350                /* Verify authenticity of the peer's certificate */
 351                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 352                /* The name in the cert must match whom we tried to connect */
 353                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 354        }
 355
 356#if LIBCURL_VERSION_NUM >= 0x070907
 357        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 358#endif
 359#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 360        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 361#endif
 362
 363        if (http_proactive_auth)
 364                init_curl_http_auth(result);
 365
 366        if (ssl_cert != NULL)
 367                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 368        if (has_cert_password())
 369                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 370#if LIBCURL_VERSION_NUM >= 0x070903
 371        if (ssl_key != NULL)
 372                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 373#endif
 374#if LIBCURL_VERSION_NUM >= 0x070908
 375        if (ssl_capath != NULL)
 376                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 377#endif
 378        if (ssl_cainfo != NULL)
 379                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 380
 381        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 382                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 383                                 curl_low_speed_limit);
 384                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 385                                 curl_low_speed_time);
 386        }
 387
 388        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 389        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 390#if LIBCURL_VERSION_NUM >= 0x071301
 391        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 392#elif LIBCURL_VERSION_NUM >= 0x071101
 393        curl_easy_setopt(result, CURLOPT_POST301, 1);
 394#endif
 395#if LIBCURL_VERSION_NUM >= 0x071304
 396        if (is_transport_allowed("http"))
 397                allowed_protocols |= CURLPROTO_HTTP;
 398        if (is_transport_allowed("https"))
 399                allowed_protocols |= CURLPROTO_HTTPS;
 400        if (is_transport_allowed("ftp"))
 401                allowed_protocols |= CURLPROTO_FTP;
 402        if (is_transport_allowed("ftps"))
 403                allowed_protocols |= CURLPROTO_FTPS;
 404        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 405#else
 406        if (transport_restrict_protocols())
 407                warning("protocol restrictions not applied to curl redirects because\n"
 408                        "your curl version is too old (>= 7.19.4)");
 409#endif
 410
 411        if (getenv("GIT_CURL_VERBOSE"))
 412                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 413
 414        curl_easy_setopt(result, CURLOPT_USERAGENT,
 415                user_agent ? user_agent : git_user_agent());
 416
 417        if (curl_ftp_no_epsv)
 418                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 419
 420#ifdef CURLOPT_USE_SSL
 421        if (curl_ssl_try)
 422                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 423#endif
 424
 425        if (curl_http_proxy) {
 426                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 427        }
 428#if LIBCURL_VERSION_NUM >= 0x070a07
 429        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 430#endif
 431
 432        set_curl_keepalive(result);
 433
 434        return result;
 435}
 436
 437static void set_from_env(const char **var, const char *envname)
 438{
 439        const char *val = getenv(envname);
 440        if (val)
 441                *var = val;
 442}
 443
 444void http_init(struct remote *remote, const char *url, int proactive_auth)
 445{
 446        char *low_speed_limit;
 447        char *low_speed_time;
 448        char *normalized_url;
 449        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 450
 451        config.section = "http";
 452        config.key = NULL;
 453        config.collect_fn = http_options;
 454        config.cascade_fn = git_default_config;
 455        config.cb = NULL;
 456
 457        http_is_verbose = 0;
 458        normalized_url = url_normalize(url, &config.url);
 459
 460        git_config(urlmatch_config_entry, &config);
 461        free(normalized_url);
 462
 463        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 464                die("curl_global_init failed");
 465
 466        http_proactive_auth = proactive_auth;
 467
 468        if (remote && remote->http_proxy)
 469                curl_http_proxy = xstrdup(remote->http_proxy);
 470
 471        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 472        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 473
 474#ifdef USE_CURL_MULTI
 475        {
 476                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 477                if (http_max_requests != NULL)
 478                        max_requests = atoi(http_max_requests);
 479        }
 480
 481        curlm = curl_multi_init();
 482        if (!curlm)
 483                die("curl_multi_init failed");
 484#endif
 485
 486        if (getenv("GIT_SSL_NO_VERIFY"))
 487                curl_ssl_verify = 0;
 488
 489        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 490#if LIBCURL_VERSION_NUM >= 0x070903
 491        set_from_env(&ssl_key, "GIT_SSL_KEY");
 492#endif
 493#if LIBCURL_VERSION_NUM >= 0x070908
 494        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 495#endif
 496        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 497
 498        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 499
 500        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 501        if (low_speed_limit != NULL)
 502                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 503        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 504        if (low_speed_time != NULL)
 505                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 506
 507        if (curl_ssl_verify == -1)
 508                curl_ssl_verify = 1;
 509
 510        curl_session_count = 0;
 511#ifdef USE_CURL_MULTI
 512        if (max_requests < 1)
 513                max_requests = DEFAULT_MAX_REQUESTS;
 514#endif
 515
 516        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 517                curl_ftp_no_epsv = 1;
 518
 519        if (url) {
 520                credential_from_url(&http_auth, url);
 521                if (!ssl_cert_password_required &&
 522                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 523                    starts_with(url, "https://"))
 524                        ssl_cert_password_required = 1;
 525        }
 526
 527#ifndef NO_CURL_EASY_DUPHANDLE
 528        curl_default = get_curl_handle();
 529#endif
 530}
 531
 532void http_cleanup(void)
 533{
 534        struct active_request_slot *slot = active_queue_head;
 535
 536        while (slot != NULL) {
 537                struct active_request_slot *next = slot->next;
 538                if (slot->curl != NULL) {
 539#ifdef USE_CURL_MULTI
 540                        curl_multi_remove_handle(curlm, slot->curl);
 541#endif
 542                        curl_easy_cleanup(slot->curl);
 543                }
 544                free(slot);
 545                slot = next;
 546        }
 547        active_queue_head = NULL;
 548
 549#ifndef NO_CURL_EASY_DUPHANDLE
 550        curl_easy_cleanup(curl_default);
 551#endif
 552
 553#ifdef USE_CURL_MULTI
 554        curl_multi_cleanup(curlm);
 555#endif
 556        curl_global_cleanup();
 557
 558        curl_slist_free_all(pragma_header);
 559        pragma_header = NULL;
 560
 561        curl_slist_free_all(no_pragma_header);
 562        no_pragma_header = NULL;
 563
 564        if (curl_http_proxy) {
 565                free((void *)curl_http_proxy);
 566                curl_http_proxy = NULL;
 567        }
 568
 569        if (cert_auth.password != NULL) {
 570                memset(cert_auth.password, 0, strlen(cert_auth.password));
 571                free(cert_auth.password);
 572                cert_auth.password = NULL;
 573        }
 574        ssl_cert_password_required = 0;
 575
 576        free(cached_accept_language);
 577        cached_accept_language = NULL;
 578}
 579
 580struct active_request_slot *get_active_slot(void)
 581{
 582        struct active_request_slot *slot = active_queue_head;
 583        struct active_request_slot *newslot;
 584
 585#ifdef USE_CURL_MULTI
 586        int num_transfers;
 587
 588        /* Wait for a slot to open up if the queue is full */
 589        while (active_requests >= max_requests) {
 590                curl_multi_perform(curlm, &num_transfers);
 591                if (num_transfers < active_requests)
 592                        process_curl_messages();
 593        }
 594#endif
 595
 596        while (slot != NULL && slot->in_use)
 597                slot = slot->next;
 598
 599        if (slot == NULL) {
 600                newslot = xmalloc(sizeof(*newslot));
 601                newslot->curl = NULL;
 602                newslot->in_use = 0;
 603                newslot->next = NULL;
 604
 605                slot = active_queue_head;
 606                if (slot == NULL) {
 607                        active_queue_head = newslot;
 608                } else {
 609                        while (slot->next != NULL)
 610                                slot = slot->next;
 611                        slot->next = newslot;
 612                }
 613                slot = newslot;
 614        }
 615
 616        if (slot->curl == NULL) {
 617#ifdef NO_CURL_EASY_DUPHANDLE
 618                slot->curl = get_curl_handle();
 619#else
 620                slot->curl = curl_easy_duphandle(curl_default);
 621#endif
 622                curl_session_count++;
 623        }
 624
 625        active_requests++;
 626        slot->in_use = 1;
 627        slot->results = NULL;
 628        slot->finished = NULL;
 629        slot->callback_data = NULL;
 630        slot->callback_func = NULL;
 631        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 632        if (curl_save_cookies)
 633                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 634        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 635        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 636        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 637        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 638        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 639        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 640        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 641        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 642        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 643#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 644        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 645#endif
 646        if (http_auth.password)
 647                init_curl_http_auth(slot->curl);
 648
 649        return slot;
 650}
 651
 652int start_active_slot(struct active_request_slot *slot)
 653{
 654#ifdef USE_CURL_MULTI
 655        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 656        int num_transfers;
 657
 658        if (curlm_result != CURLM_OK &&
 659            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 660                active_requests--;
 661                slot->in_use = 0;
 662                return 0;
 663        }
 664
 665        /*
 666         * We know there must be something to do, since we just added
 667         * something.
 668         */
 669        curl_multi_perform(curlm, &num_transfers);
 670#endif
 671        return 1;
 672}
 673
 674#ifdef USE_CURL_MULTI
 675struct fill_chain {
 676        void *data;
 677        int (*fill)(void *);
 678        struct fill_chain *next;
 679};
 680
 681static struct fill_chain *fill_cfg;
 682
 683void add_fill_function(void *data, int (*fill)(void *))
 684{
 685        struct fill_chain *new = xmalloc(sizeof(*new));
 686        struct fill_chain **linkp = &fill_cfg;
 687        new->data = data;
 688        new->fill = fill;
 689        new->next = NULL;
 690        while (*linkp)
 691                linkp = &(*linkp)->next;
 692        *linkp = new;
 693}
 694
 695void fill_active_slots(void)
 696{
 697        struct active_request_slot *slot = active_queue_head;
 698
 699        while (active_requests < max_requests) {
 700                struct fill_chain *fill;
 701                for (fill = fill_cfg; fill; fill = fill->next)
 702                        if (fill->fill(fill->data))
 703                                break;
 704
 705                if (!fill)
 706                        break;
 707        }
 708
 709        while (slot != NULL) {
 710                if (!slot->in_use && slot->curl != NULL
 711                        && curl_session_count > min_curl_sessions) {
 712                        curl_easy_cleanup(slot->curl);
 713                        slot->curl = NULL;
 714                        curl_session_count--;
 715                }
 716                slot = slot->next;
 717        }
 718}
 719
 720void step_active_slots(void)
 721{
 722        int num_transfers;
 723        CURLMcode curlm_result;
 724
 725        do {
 726                curlm_result = curl_multi_perform(curlm, &num_transfers);
 727        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 728        if (num_transfers < active_requests) {
 729                process_curl_messages();
 730                fill_active_slots();
 731        }
 732}
 733#endif
 734
 735void run_active_slot(struct active_request_slot *slot)
 736{
 737#ifdef USE_CURL_MULTI
 738        fd_set readfds;
 739        fd_set writefds;
 740        fd_set excfds;
 741        int max_fd;
 742        struct timeval select_timeout;
 743        int finished = 0;
 744
 745        slot->finished = &finished;
 746        while (!finished) {
 747                step_active_slots();
 748
 749                if (slot->in_use) {
 750#if LIBCURL_VERSION_NUM >= 0x070f04
 751                        long curl_timeout;
 752                        curl_multi_timeout(curlm, &curl_timeout);
 753                        if (curl_timeout == 0) {
 754                                continue;
 755                        } else if (curl_timeout == -1) {
 756                                select_timeout.tv_sec  = 0;
 757                                select_timeout.tv_usec = 50000;
 758                        } else {
 759                                select_timeout.tv_sec  =  curl_timeout / 1000;
 760                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 761                        }
 762#else
 763                        select_timeout.tv_sec  = 0;
 764                        select_timeout.tv_usec = 50000;
 765#endif
 766
 767                        max_fd = -1;
 768                        FD_ZERO(&readfds);
 769                        FD_ZERO(&writefds);
 770                        FD_ZERO(&excfds);
 771                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 772
 773                        /*
 774                         * It can happen that curl_multi_timeout returns a pathologically
 775                         * long timeout when curl_multi_fdset returns no file descriptors
 776                         * to read.  See commit message for more details.
 777                         */
 778                        if (max_fd < 0 &&
 779                            (select_timeout.tv_sec > 0 ||
 780                             select_timeout.tv_usec > 50000)) {
 781                                select_timeout.tv_sec  = 0;
 782                                select_timeout.tv_usec = 50000;
 783                        }
 784
 785                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 786                }
 787        }
 788#else
 789        while (slot->in_use) {
 790                slot->curl_result = curl_easy_perform(slot->curl);
 791                finish_active_slot(slot);
 792        }
 793#endif
 794}
 795
 796static void release_active_slot(struct active_request_slot *slot)
 797{
 798        closedown_active_slot(slot);
 799        if (slot->curl && curl_session_count > min_curl_sessions) {
 800#ifdef USE_CURL_MULTI
 801                curl_multi_remove_handle(curlm, slot->curl);
 802#endif
 803                curl_easy_cleanup(slot->curl);
 804                slot->curl = NULL;
 805                curl_session_count--;
 806        }
 807#ifdef USE_CURL_MULTI
 808        fill_active_slots();
 809#endif
 810}
 811
 812void finish_all_active_slots(void)
 813{
 814        struct active_request_slot *slot = active_queue_head;
 815
 816        while (slot != NULL)
 817                if (slot->in_use) {
 818                        run_active_slot(slot);
 819                        slot = active_queue_head;
 820                } else {
 821                        slot = slot->next;
 822                }
 823}
 824
 825/* Helpers for modifying and creating URLs */
 826static inline int needs_quote(int ch)
 827{
 828        if (((ch >= 'A') && (ch <= 'Z'))
 829                        || ((ch >= 'a') && (ch <= 'z'))
 830                        || ((ch >= '0') && (ch <= '9'))
 831                        || (ch == '/')
 832                        || (ch == '-')
 833                        || (ch == '.'))
 834                return 0;
 835        return 1;
 836}
 837
 838static char *quote_ref_url(const char *base, const char *ref)
 839{
 840        struct strbuf buf = STRBUF_INIT;
 841        const char *cp;
 842        int ch;
 843
 844        end_url_with_slash(&buf, base);
 845
 846        for (cp = ref; (ch = *cp) != 0; cp++)
 847                if (needs_quote(ch))
 848                        strbuf_addf(&buf, "%%%02x", ch);
 849                else
 850                        strbuf_addch(&buf, *cp);
 851
 852        return strbuf_detach(&buf, NULL);
 853}
 854
 855void append_remote_object_url(struct strbuf *buf, const char *url,
 856                              const char *hex,
 857                              int only_two_digit_prefix)
 858{
 859        end_url_with_slash(buf, url);
 860
 861        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 862        if (!only_two_digit_prefix)
 863                strbuf_addf(buf, "%s", hex+2);
 864}
 865
 866char *get_remote_object_url(const char *url, const char *hex,
 867                            int only_two_digit_prefix)
 868{
 869        struct strbuf buf = STRBUF_INIT;
 870        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 871        return strbuf_detach(&buf, NULL);
 872}
 873
 874static int handle_curl_result(struct slot_results *results)
 875{
 876        /*
 877         * If we see a failing http code with CURLE_OK, we have turned off
 878         * FAILONERROR (to keep the server's custom error response), and should
 879         * translate the code into failure here.
 880         */
 881        if (results->curl_result == CURLE_OK &&
 882            results->http_code >= 400) {
 883                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
 884                /*
 885                 * Normally curl will already have put the "reason phrase"
 886                 * from the server into curl_errorstr; unfortunately without
 887                 * FAILONERROR it is lost, so we can give only the numeric
 888                 * status code.
 889                 */
 890                snprintf(curl_errorstr, sizeof(curl_errorstr),
 891                         "The requested URL returned error: %ld",
 892                         results->http_code);
 893        }
 894
 895        if (results->curl_result == CURLE_OK) {
 896                credential_approve(&http_auth);
 897                return HTTP_OK;
 898        } else if (missing_target(results))
 899                return HTTP_MISSING_TARGET;
 900        else if (results->http_code == 401) {
 901                if (http_auth.username && http_auth.password) {
 902                        credential_reject(&http_auth);
 903                        return HTTP_NOAUTH;
 904                } else {
 905#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 906                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
 907#endif
 908                        return HTTP_REAUTH;
 909                }
 910        } else {
 911#if LIBCURL_VERSION_NUM >= 0x070c00
 912                if (!curl_errorstr[0])
 913                        strlcpy(curl_errorstr,
 914                                curl_easy_strerror(results->curl_result),
 915                                sizeof(curl_errorstr));
 916#endif
 917                return HTTP_ERROR;
 918        }
 919}
 920
 921int run_one_slot(struct active_request_slot *slot,
 922                 struct slot_results *results)
 923{
 924        slot->results = results;
 925        if (!start_active_slot(slot)) {
 926                snprintf(curl_errorstr, sizeof(curl_errorstr),
 927                         "failed to start HTTP request");
 928                return HTTP_START_FAILED;
 929        }
 930
 931        run_active_slot(slot);
 932        return handle_curl_result(results);
 933}
 934
 935static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
 936{
 937        char *ptr;
 938        CURLcode ret;
 939
 940        strbuf_reset(buf);
 941        ret = curl_easy_getinfo(curl, info, &ptr);
 942        if (!ret && ptr)
 943                strbuf_addstr(buf, ptr);
 944        return ret;
 945}
 946
 947/*
 948 * Check for and extract a content-type parameter. "raw"
 949 * should be positioned at the start of the potential
 950 * parameter, with any whitespace already removed.
 951 *
 952 * "name" is the name of the parameter. The value is appended
 953 * to "out".
 954 */
 955static int extract_param(const char *raw, const char *name,
 956                         struct strbuf *out)
 957{
 958        size_t len = strlen(name);
 959
 960        if (strncasecmp(raw, name, len))
 961                return -1;
 962        raw += len;
 963
 964        if (*raw != '=')
 965                return -1;
 966        raw++;
 967
 968        while (*raw && !isspace(*raw) && *raw != ';')
 969                strbuf_addch(out, *raw++);
 970        return 0;
 971}
 972
 973/*
 974 * Extract a normalized version of the content type, with any
 975 * spaces suppressed, all letters lowercased, and no trailing ";"
 976 * or parameters.
 977 *
 978 * Note that we will silently remove even invalid whitespace. For
 979 * example, "text / plain" is specifically forbidden by RFC 2616,
 980 * but "text/plain" is the only reasonable output, and this keeps
 981 * our code simple.
 982 *
 983 * If the "charset" argument is not NULL, store the value of any
 984 * charset parameter there.
 985 *
 986 * Example:
 987 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
 988 *   "text / plain" -> "text/plain"
 989 */
 990static void extract_content_type(struct strbuf *raw, struct strbuf *type,
 991                                 struct strbuf *charset)
 992{
 993        const char *p;
 994
 995        strbuf_reset(type);
 996        strbuf_grow(type, raw->len);
 997        for (p = raw->buf; *p; p++) {
 998                if (isspace(*p))
 999                        continue;
1000                if (*p == ';') {
1001                        p++;
1002                        break;
1003                }
1004                strbuf_addch(type, tolower(*p));
1005        }
1006
1007        if (!charset)
1008                return;
1009
1010        strbuf_reset(charset);
1011        while (*p) {
1012                while (isspace(*p) || *p == ';')
1013                        p++;
1014                if (!extract_param(p, "charset", charset))
1015                        return;
1016                while (*p && !isspace(*p))
1017                        p++;
1018        }
1019
1020        if (!charset->len && starts_with(type->buf, "text/"))
1021                strbuf_addstr(charset, "ISO-8859-1");
1022}
1023
1024static void write_accept_language(struct strbuf *buf)
1025{
1026        /*
1027         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1028         * that, q-value will be smaller than 0.001, the minimum q-value the
1029         * HTTP specification allows. See
1030         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1031         */
1032        const int MAX_DECIMAL_PLACES = 3;
1033        const int MAX_LANGUAGE_TAGS = 1000;
1034        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1035        char **language_tags = NULL;
1036        int num_langs = 0;
1037        const char *s = get_preferred_languages();
1038        int i;
1039        struct strbuf tag = STRBUF_INIT;
1040
1041        /* Don't add Accept-Language header if no language is preferred. */
1042        if (!s)
1043                return;
1044
1045        /*
1046         * Split the colon-separated string of preferred languages into
1047         * language_tags array.
1048         */
1049        do {
1050                /* collect language tag */
1051                for (; *s && (isalnum(*s) || *s == '_'); s++)
1052                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1053
1054                /* skip .codeset, @modifier and any other unnecessary parts */
1055                while (*s && *s != ':')
1056                        s++;
1057
1058                if (tag.len) {
1059                        num_langs++;
1060                        REALLOC_ARRAY(language_tags, num_langs);
1061                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1062                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1063                                break;
1064                }
1065        } while (*s++);
1066
1067        /* write Accept-Language header into buf */
1068        if (num_langs) {
1069                int last_buf_len = 0;
1070                int max_q;
1071                int decimal_places;
1072                char q_format[32];
1073
1074                /* add '*' */
1075                REALLOC_ARRAY(language_tags, num_langs + 1);
1076                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1077
1078                /* compute decimal_places */
1079                for (max_q = 1, decimal_places = 0;
1080                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1081                     decimal_places++, max_q *= 10)
1082                        ;
1083
1084                sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1085
1086                strbuf_addstr(buf, "Accept-Language: ");
1087
1088                for (i = 0; i < num_langs; i++) {
1089                        if (i > 0)
1090                                strbuf_addstr(buf, ", ");
1091
1092                        strbuf_addstr(buf, language_tags[i]);
1093
1094                        if (i > 0)
1095                                strbuf_addf(buf, q_format, max_q - i);
1096
1097                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1098                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1099                                break;
1100                        }
1101
1102                        last_buf_len = buf->len;
1103                }
1104        }
1105
1106        /* free language tags -- last one is a static '*' */
1107        for (i = 0; i < num_langs - 1; i++)
1108                free(language_tags[i]);
1109        free(language_tags);
1110}
1111
1112/*
1113 * Get an Accept-Language header which indicates user's preferred languages.
1114 *
1115 * Examples:
1116 *   LANGUAGE= -> ""
1117 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1118 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1119 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1120 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1121 *   LANGUAGE= LANG=C -> ""
1122 */
1123static const char *get_accept_language(void)
1124{
1125        if (!cached_accept_language) {
1126                struct strbuf buf = STRBUF_INIT;
1127                write_accept_language(&buf);
1128                if (buf.len > 0)
1129                        cached_accept_language = strbuf_detach(&buf, NULL);
1130        }
1131
1132        return cached_accept_language;
1133}
1134
1135/* http_request() targets */
1136#define HTTP_REQUEST_STRBUF     0
1137#define HTTP_REQUEST_FILE       1
1138
1139static int http_request(const char *url,
1140                        void *result, int target,
1141                        const struct http_get_options *options)
1142{
1143        struct active_request_slot *slot;
1144        struct slot_results results;
1145        struct curl_slist *headers = NULL;
1146        struct strbuf buf = STRBUF_INIT;
1147        const char *accept_language;
1148        int ret;
1149
1150        slot = get_active_slot();
1151        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1152
1153        if (result == NULL) {
1154                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1155        } else {
1156                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1157                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1158
1159                if (target == HTTP_REQUEST_FILE) {
1160                        long posn = ftell(result);
1161                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1162                                         fwrite);
1163                        if (posn > 0) {
1164                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1165                                headers = curl_slist_append(headers, buf.buf);
1166                                strbuf_reset(&buf);
1167                        }
1168                } else
1169                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1170                                         fwrite_buffer);
1171        }
1172
1173        accept_language = get_accept_language();
1174
1175        if (accept_language)
1176                headers = curl_slist_append(headers, accept_language);
1177
1178        strbuf_addstr(&buf, "Pragma:");
1179        if (options && options->no_cache)
1180                strbuf_addstr(&buf, " no-cache");
1181        if (options && options->keep_error)
1182                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1183
1184        headers = curl_slist_append(headers, buf.buf);
1185
1186        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1187        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1188        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1189
1190        ret = run_one_slot(slot, &results);
1191
1192        if (options && options->content_type) {
1193                struct strbuf raw = STRBUF_INIT;
1194                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1195                extract_content_type(&raw, options->content_type,
1196                                     options->charset);
1197                strbuf_release(&raw);
1198        }
1199
1200        if (options && options->effective_url)
1201                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1202                                options->effective_url);
1203
1204        curl_slist_free_all(headers);
1205        strbuf_release(&buf);
1206
1207        return ret;
1208}
1209
1210/*
1211 * Update the "base" url to a more appropriate value, as deduced by
1212 * redirects seen when requesting a URL starting with "url".
1213 *
1214 * The "asked" parameter is a URL that we asked curl to access, and must begin
1215 * with "base".
1216 *
1217 * The "got" parameter is the URL that curl reported to us as where we ended
1218 * up.
1219 *
1220 * Returns 1 if we updated the base url, 0 otherwise.
1221 *
1222 * Our basic strategy is to compare "base" and "asked" to find the bits
1223 * specific to our request. We then strip those bits off of "got" to yield the
1224 * new base. So for example, if our base is "http://example.com/foo.git",
1225 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1226 * with "https://other.example.com/foo.git/info/refs". We would want the
1227 * new URL to become "https://other.example.com/foo.git".
1228 *
1229 * Note that this assumes a sane redirect scheme. It's entirely possible
1230 * in the example above to end up at a URL that does not even end in
1231 * "info/refs".  In such a case we simply punt, as there is not much we can
1232 * do (and such a scheme is unlikely to represent a real git repository,
1233 * which means we are likely about to abort anyway).
1234 */
1235static int update_url_from_redirect(struct strbuf *base,
1236                                    const char *asked,
1237                                    const struct strbuf *got)
1238{
1239        const char *tail;
1240        size_t tail_len;
1241
1242        if (!strcmp(asked, got->buf))
1243                return 0;
1244
1245        if (!skip_prefix(asked, base->buf, &tail))
1246                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1247                    asked, base->buf);
1248
1249        tail_len = strlen(tail);
1250
1251        if (got->len < tail_len ||
1252            strcmp(tail, got->buf + got->len - tail_len))
1253                return 0; /* insane redirect scheme */
1254
1255        strbuf_reset(base);
1256        strbuf_add(base, got->buf, got->len - tail_len);
1257        return 1;
1258}
1259
1260static int http_request_reauth(const char *url,
1261                               void *result, int target,
1262                               struct http_get_options *options)
1263{
1264        int ret = http_request(url, result, target, options);
1265
1266        if (options && options->effective_url && options->base_url) {
1267                if (update_url_from_redirect(options->base_url,
1268                                             url, options->effective_url)) {
1269                        credential_from_url(&http_auth, options->base_url->buf);
1270                        url = options->effective_url->buf;
1271                }
1272        }
1273
1274        if (ret != HTTP_REAUTH)
1275                return ret;
1276
1277        /*
1278         * If we are using KEEP_ERROR, the previous request may have
1279         * put cruft into our output stream; we should clear it out before
1280         * making our next request. We only know how to do this for
1281         * the strbuf case, but that is enough to satisfy current callers.
1282         */
1283        if (options && options->keep_error) {
1284                switch (target) {
1285                case HTTP_REQUEST_STRBUF:
1286                        strbuf_reset(result);
1287                        break;
1288                default:
1289                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1290                }
1291        }
1292
1293        credential_fill(&http_auth);
1294
1295        return http_request(url, result, target, options);
1296}
1297
1298int http_get_strbuf(const char *url,
1299                    struct strbuf *result,
1300                    struct http_get_options *options)
1301{
1302        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1303}
1304
1305/*
1306 * Downloads a URL and stores the result in the given file.
1307 *
1308 * If a previous interrupted download is detected (i.e. a previous temporary
1309 * file is still around) the download is resumed.
1310 */
1311static int http_get_file(const char *url, const char *filename,
1312                         struct http_get_options *options)
1313{
1314        int ret;
1315        struct strbuf tmpfile = STRBUF_INIT;
1316        FILE *result;
1317
1318        strbuf_addf(&tmpfile, "%s.temp", filename);
1319        result = fopen(tmpfile.buf, "a");
1320        if (!result) {
1321                error("Unable to open local file %s", tmpfile.buf);
1322                ret = HTTP_ERROR;
1323                goto cleanup;
1324        }
1325
1326        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1327        fclose(result);
1328
1329        if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1330                ret = HTTP_ERROR;
1331cleanup:
1332        strbuf_release(&tmpfile);
1333        return ret;
1334}
1335
1336int http_fetch_ref(const char *base, struct ref *ref)
1337{
1338        struct http_get_options options = {0};
1339        char *url;
1340        struct strbuf buffer = STRBUF_INIT;
1341        int ret = -1;
1342
1343        options.no_cache = 1;
1344
1345        url = quote_ref_url(base, ref->name);
1346        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1347                strbuf_rtrim(&buffer);
1348                if (buffer.len == 40)
1349                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1350                else if (starts_with(buffer.buf, "ref: ")) {
1351                        ref->symref = xstrdup(buffer.buf + 5);
1352                        ret = 0;
1353                }
1354        }
1355
1356        strbuf_release(&buffer);
1357        free(url);
1358        return ret;
1359}
1360
1361/* Helpers for fetching packs */
1362static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1363{
1364        char *url, *tmp;
1365        struct strbuf buf = STRBUF_INIT;
1366
1367        if (http_is_verbose)
1368                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1369
1370        end_url_with_slash(&buf, base_url);
1371        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1372        url = strbuf_detach(&buf, NULL);
1373
1374        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1375        tmp = strbuf_detach(&buf, NULL);
1376
1377        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1378                error("Unable to get pack index %s", url);
1379                free(tmp);
1380                tmp = NULL;
1381        }
1382
1383        free(url);
1384        return tmp;
1385}
1386
1387static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1388        unsigned char *sha1, const char *base_url)
1389{
1390        struct packed_git *new_pack;
1391        char *tmp_idx = NULL;
1392        int ret;
1393
1394        if (has_pack_index(sha1)) {
1395                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1396                if (!new_pack)
1397                        return -1; /* parse_pack_index() already issued error message */
1398                goto add_pack;
1399        }
1400
1401        tmp_idx = fetch_pack_index(sha1, base_url);
1402        if (!tmp_idx)
1403                return -1;
1404
1405        new_pack = parse_pack_index(sha1, tmp_idx);
1406        if (!new_pack) {
1407                unlink(tmp_idx);
1408                free(tmp_idx);
1409
1410                return -1; /* parse_pack_index() already issued error message */
1411        }
1412
1413        ret = verify_pack_index(new_pack);
1414        if (!ret) {
1415                close_pack_index(new_pack);
1416                ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1417        }
1418        free(tmp_idx);
1419        if (ret)
1420                return -1;
1421
1422add_pack:
1423        new_pack->next = *packs_head;
1424        *packs_head = new_pack;
1425        return 0;
1426}
1427
1428int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1429{
1430        struct http_get_options options = {0};
1431        int ret = 0, i = 0;
1432        char *url, *data;
1433        struct strbuf buf = STRBUF_INIT;
1434        unsigned char sha1[20];
1435
1436        end_url_with_slash(&buf, base_url);
1437        strbuf_addstr(&buf, "objects/info/packs");
1438        url = strbuf_detach(&buf, NULL);
1439
1440        options.no_cache = 1;
1441        ret = http_get_strbuf(url, &buf, &options);
1442        if (ret != HTTP_OK)
1443                goto cleanup;
1444
1445        data = buf.buf;
1446        while (i < buf.len) {
1447                switch (data[i]) {
1448                case 'P':
1449                        i++;
1450                        if (i + 52 <= buf.len &&
1451                            starts_with(data + i, " pack-") &&
1452                            starts_with(data + i + 46, ".pack\n")) {
1453                                get_sha1_hex(data + i + 6, sha1);
1454                                fetch_and_setup_pack_index(packs_head, sha1,
1455                                                      base_url);
1456                                i += 51;
1457                                break;
1458                        }
1459                default:
1460                        while (i < buf.len && data[i] != '\n')
1461                                i++;
1462                }
1463                i++;
1464        }
1465
1466cleanup:
1467        free(url);
1468        return ret;
1469}
1470
1471void release_http_pack_request(struct http_pack_request *preq)
1472{
1473        if (preq->packfile != NULL) {
1474                fclose(preq->packfile);
1475                preq->packfile = NULL;
1476        }
1477        if (preq->range_header != NULL) {
1478                curl_slist_free_all(preq->range_header);
1479                preq->range_header = NULL;
1480        }
1481        preq->slot = NULL;
1482        free(preq->url);
1483        free(preq);
1484}
1485
1486int finish_http_pack_request(struct http_pack_request *preq)
1487{
1488        struct packed_git **lst;
1489        struct packed_git *p = preq->target;
1490        char *tmp_idx;
1491        struct child_process ip = CHILD_PROCESS_INIT;
1492        const char *ip_argv[8];
1493
1494        close_pack_index(p);
1495
1496        fclose(preq->packfile);
1497        preq->packfile = NULL;
1498
1499        lst = preq->lst;
1500        while (*lst != p)
1501                lst = &((*lst)->next);
1502        *lst = (*lst)->next;
1503
1504        tmp_idx = xstrdup(preq->tmpfile);
1505        strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1506               ".idx.temp");
1507
1508        ip_argv[0] = "index-pack";
1509        ip_argv[1] = "-o";
1510        ip_argv[2] = tmp_idx;
1511        ip_argv[3] = preq->tmpfile;
1512        ip_argv[4] = NULL;
1513
1514        ip.argv = ip_argv;
1515        ip.git_cmd = 1;
1516        ip.no_stdin = 1;
1517        ip.no_stdout = 1;
1518
1519        if (run_command(&ip)) {
1520                unlink(preq->tmpfile);
1521                unlink(tmp_idx);
1522                free(tmp_idx);
1523                return -1;
1524        }
1525
1526        unlink(sha1_pack_index_name(p->sha1));
1527
1528        if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1529         || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1530                free(tmp_idx);
1531                return -1;
1532        }
1533
1534        install_packed_git(p);
1535        free(tmp_idx);
1536        return 0;
1537}
1538
1539struct http_pack_request *new_http_pack_request(
1540        struct packed_git *target, const char *base_url)
1541{
1542        long prev_posn = 0;
1543        char range[RANGE_HEADER_SIZE];
1544        struct strbuf buf = STRBUF_INIT;
1545        struct http_pack_request *preq;
1546
1547        preq = xcalloc(1, sizeof(*preq));
1548        preq->target = target;
1549
1550        end_url_with_slash(&buf, base_url);
1551        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1552                sha1_to_hex(target->sha1));
1553        preq->url = strbuf_detach(&buf, NULL);
1554
1555        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1556                sha1_pack_name(target->sha1));
1557        preq->packfile = fopen(preq->tmpfile, "a");
1558        if (!preq->packfile) {
1559                error("Unable to open local file %s for pack",
1560                      preq->tmpfile);
1561                goto abort;
1562        }
1563
1564        preq->slot = get_active_slot();
1565        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1566        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1567        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1568        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1569                no_pragma_header);
1570
1571        /*
1572         * If there is data present from a previous transfer attempt,
1573         * resume where it left off
1574         */
1575        prev_posn = ftell(preq->packfile);
1576        if (prev_posn>0) {
1577                if (http_is_verbose)
1578                        fprintf(stderr,
1579                                "Resuming fetch of pack %s at byte %ld\n",
1580                                sha1_to_hex(target->sha1), prev_posn);
1581                sprintf(range, "Range: bytes=%ld-", prev_posn);
1582                preq->range_header = curl_slist_append(NULL, range);
1583                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1584                        preq->range_header);
1585        }
1586
1587        return preq;
1588
1589abort:
1590        free(preq->url);
1591        free(preq);
1592        return NULL;
1593}
1594
1595/* Helpers for fetching objects (loose) */
1596static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1597                               void *data)
1598{
1599        unsigned char expn[4096];
1600        size_t size = eltsize * nmemb;
1601        int posn = 0;
1602        struct http_object_request *freq =
1603                (struct http_object_request *)data;
1604        do {
1605                ssize_t retval = xwrite(freq->localfile,
1606                                        (char *) ptr + posn, size - posn);
1607                if (retval < 0)
1608                        return posn;
1609                posn += retval;
1610        } while (posn < size);
1611
1612        freq->stream.avail_in = size;
1613        freq->stream.next_in = (void *)ptr;
1614        do {
1615                freq->stream.next_out = expn;
1616                freq->stream.avail_out = sizeof(expn);
1617                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1618                git_SHA1_Update(&freq->c, expn,
1619                                sizeof(expn) - freq->stream.avail_out);
1620        } while (freq->stream.avail_in && freq->zret == Z_OK);
1621        return size;
1622}
1623
1624struct http_object_request *new_http_object_request(const char *base_url,
1625        unsigned char *sha1)
1626{
1627        char *hex = sha1_to_hex(sha1);
1628        const char *filename;
1629        char prevfile[PATH_MAX];
1630        int prevlocal;
1631        char prev_buf[PREV_BUF_SIZE];
1632        ssize_t prev_read = 0;
1633        long prev_posn = 0;
1634        char range[RANGE_HEADER_SIZE];
1635        struct curl_slist *range_header = NULL;
1636        struct http_object_request *freq;
1637
1638        freq = xcalloc(1, sizeof(*freq));
1639        hashcpy(freq->sha1, sha1);
1640        freq->localfile = -1;
1641
1642        filename = sha1_file_name(sha1);
1643        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1644                 "%s.temp", filename);
1645
1646        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1647        unlink_or_warn(prevfile);
1648        rename(freq->tmpfile, prevfile);
1649        unlink_or_warn(freq->tmpfile);
1650
1651        if (freq->localfile != -1)
1652                error("fd leakage in start: %d", freq->localfile);
1653        freq->localfile = open(freq->tmpfile,
1654                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1655        /*
1656         * This could have failed due to the "lazy directory creation";
1657         * try to mkdir the last path component.
1658         */
1659        if (freq->localfile < 0 && errno == ENOENT) {
1660                char *dir = strrchr(freq->tmpfile, '/');
1661                if (dir) {
1662                        *dir = 0;
1663                        mkdir(freq->tmpfile, 0777);
1664                        *dir = '/';
1665                }
1666                freq->localfile = open(freq->tmpfile,
1667                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1668        }
1669
1670        if (freq->localfile < 0) {
1671                error("Couldn't create temporary file %s: %s",
1672                      freq->tmpfile, strerror(errno));
1673                goto abort;
1674        }
1675
1676        git_inflate_init(&freq->stream);
1677
1678        git_SHA1_Init(&freq->c);
1679
1680        freq->url = get_remote_object_url(base_url, hex, 0);
1681
1682        /*
1683         * If a previous temp file is present, process what was already
1684         * fetched.
1685         */
1686        prevlocal = open(prevfile, O_RDONLY);
1687        if (prevlocal != -1) {
1688                do {
1689                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1690                        if (prev_read>0) {
1691                                if (fwrite_sha1_file(prev_buf,
1692                                                     1,
1693                                                     prev_read,
1694                                                     freq) == prev_read) {
1695                                        prev_posn += prev_read;
1696                                } else {
1697                                        prev_read = -1;
1698                                }
1699                        }
1700                } while (prev_read > 0);
1701                close(prevlocal);
1702        }
1703        unlink_or_warn(prevfile);
1704
1705        /*
1706         * Reset inflate/SHA1 if there was an error reading the previous temp
1707         * file; also rewind to the beginning of the local file.
1708         */
1709        if (prev_read == -1) {
1710                memset(&freq->stream, 0, sizeof(freq->stream));
1711                git_inflate_init(&freq->stream);
1712                git_SHA1_Init(&freq->c);
1713                if (prev_posn>0) {
1714                        prev_posn = 0;
1715                        lseek(freq->localfile, 0, SEEK_SET);
1716                        if (ftruncate(freq->localfile, 0) < 0) {
1717                                error("Couldn't truncate temporary file %s: %s",
1718                                          freq->tmpfile, strerror(errno));
1719                                goto abort;
1720                        }
1721                }
1722        }
1723
1724        freq->slot = get_active_slot();
1725
1726        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1727        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1728        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1729        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1730        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1731
1732        /*
1733         * If we have successfully processed data from a previous fetch
1734         * attempt, only fetch the data we don't already have.
1735         */
1736        if (prev_posn>0) {
1737                if (http_is_verbose)
1738                        fprintf(stderr,
1739                                "Resuming fetch of object %s at byte %ld\n",
1740                                hex, prev_posn);
1741                sprintf(range, "Range: bytes=%ld-", prev_posn);
1742                range_header = curl_slist_append(range_header, range);
1743                curl_easy_setopt(freq->slot->curl,
1744                                 CURLOPT_HTTPHEADER, range_header);
1745        }
1746
1747        return freq;
1748
1749abort:
1750        free(freq->url);
1751        free(freq);
1752        return NULL;
1753}
1754
1755void process_http_object_request(struct http_object_request *freq)
1756{
1757        if (freq->slot == NULL)
1758                return;
1759        freq->curl_result = freq->slot->curl_result;
1760        freq->http_code = freq->slot->http_code;
1761        freq->slot = NULL;
1762}
1763
1764int finish_http_object_request(struct http_object_request *freq)
1765{
1766        struct stat st;
1767
1768        close(freq->localfile);
1769        freq->localfile = -1;
1770
1771        process_http_object_request(freq);
1772
1773        if (freq->http_code == 416) {
1774                warning("requested range invalid; we may already have all the data.");
1775        } else if (freq->curl_result != CURLE_OK) {
1776                if (stat(freq->tmpfile, &st) == 0)
1777                        if (st.st_size == 0)
1778                                unlink_or_warn(freq->tmpfile);
1779                return -1;
1780        }
1781
1782        git_inflate_end(&freq->stream);
1783        git_SHA1_Final(freq->real_sha1, &freq->c);
1784        if (freq->zret != Z_STREAM_END) {
1785                unlink_or_warn(freq->tmpfile);
1786                return -1;
1787        }
1788        if (hashcmp(freq->sha1, freq->real_sha1)) {
1789                unlink_or_warn(freq->tmpfile);
1790                return -1;
1791        }
1792        freq->rename =
1793                move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1794
1795        return freq->rename;
1796}
1797
1798void abort_http_object_request(struct http_object_request *freq)
1799{
1800        unlink_or_warn(freq->tmpfile);
1801
1802        release_http_object_request(freq);
1803}
1804
1805void release_http_object_request(struct http_object_request *freq)
1806{
1807        if (freq->localfile != -1) {
1808                close(freq->localfile);
1809                freq->localfile = -1;
1810        }
1811        if (freq->url != NULL) {
1812                free(freq->url);
1813                freq->url = NULL;
1814        }
1815        if (freq->slot != NULL) {
1816                freq->slot->callback_func = NULL;
1817                freq->slot->callback_data = NULL;
1818                release_active_slot(freq->slot);
1819                freq->slot = NULL;
1820        }
1821}