f46bfc43f9e5e8073563be853744262a1bb4c5d6
   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
  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 *http_proxy_authmethod;
  66static struct {
  67        const char *name;
  68        long curlauth_param;
  69} proxy_authmethods[] = {
  70        { "basic", CURLAUTH_BASIC },
  71        { "digest", CURLAUTH_DIGEST },
  72        { "negotiate", CURLAUTH_GSSNEGOTIATE },
  73        { "ntlm", CURLAUTH_NTLM },
  74#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  75        { "anyauth", CURLAUTH_ANY },
  76#endif
  77        /*
  78         * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  79         * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  80         * here, too
  81         */
  82};
  83static const char *curl_cookie_file;
  84static int curl_save_cookies;
  85struct credential http_auth = CREDENTIAL_INIT;
  86static int http_proactive_auth;
  87static const char *user_agent;
  88
  89#if LIBCURL_VERSION_NUM >= 0x071700
  90/* Use CURLOPT_KEYPASSWD as is */
  91#elif LIBCURL_VERSION_NUM >= 0x070903
  92#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  93#else
  94#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  95#endif
  96
  97static struct credential cert_auth = CREDENTIAL_INIT;
  98static int ssl_cert_password_required;
  99#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 100static unsigned long http_auth_methods = CURLAUTH_ANY;
 101#endif
 102
 103static struct curl_slist *pragma_header;
 104static struct curl_slist *no_pragma_header;
 105
 106static struct active_request_slot *active_queue_head;
 107
 108static char *cached_accept_language;
 109
 110size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 111{
 112        size_t size = eltsize * nmemb;
 113        struct buffer *buffer = buffer_;
 114
 115        if (size > buffer->buf.len - buffer->posn)
 116                size = buffer->buf.len - buffer->posn;
 117        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 118        buffer->posn += size;
 119
 120        return size;
 121}
 122
 123#ifndef NO_CURL_IOCTL
 124curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 125{
 126        struct buffer *buffer = clientp;
 127
 128        switch (cmd) {
 129        case CURLIOCMD_NOP:
 130                return CURLIOE_OK;
 131
 132        case CURLIOCMD_RESTARTREAD:
 133                buffer->posn = 0;
 134                return CURLIOE_OK;
 135
 136        default:
 137                return CURLIOE_UNKNOWNCMD;
 138        }
 139}
 140#endif
 141
 142size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 143{
 144        size_t size = eltsize * nmemb;
 145        struct strbuf *buffer = buffer_;
 146
 147        strbuf_add(buffer, ptr, size);
 148        return size;
 149}
 150
 151size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 152{
 153        return eltsize * nmemb;
 154}
 155
 156static void closedown_active_slot(struct active_request_slot *slot)
 157{
 158        active_requests--;
 159        slot->in_use = 0;
 160}
 161
 162static void finish_active_slot(struct active_request_slot *slot)
 163{
 164        closedown_active_slot(slot);
 165        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 166
 167        if (slot->finished != NULL)
 168                (*slot->finished) = 1;
 169
 170        /* Store slot results so they can be read after the slot is reused */
 171        if (slot->results != NULL) {
 172                slot->results->curl_result = slot->curl_result;
 173                slot->results->http_code = slot->http_code;
 174#if LIBCURL_VERSION_NUM >= 0x070a08
 175                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 176                                  &slot->results->auth_avail);
 177#else
 178                slot->results->auth_avail = 0;
 179#endif
 180        }
 181
 182        /* Run callback if appropriate */
 183        if (slot->callback_func != NULL)
 184                slot->callback_func(slot->callback_data);
 185}
 186
 187#ifdef USE_CURL_MULTI
 188static void process_curl_messages(void)
 189{
 190        int num_messages;
 191        struct active_request_slot *slot;
 192        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 193
 194        while (curl_message != NULL) {
 195                if (curl_message->msg == CURLMSG_DONE) {
 196                        int curl_result = curl_message->data.result;
 197                        slot = active_queue_head;
 198                        while (slot != NULL &&
 199                               slot->curl != curl_message->easy_handle)
 200                                slot = slot->next;
 201                        if (slot != NULL) {
 202                                curl_multi_remove_handle(curlm, slot->curl);
 203                                slot->curl_result = curl_result;
 204                                finish_active_slot(slot);
 205                        } else {
 206                                fprintf(stderr, "Received DONE message for unknown request!\n");
 207                        }
 208                } else {
 209                        fprintf(stderr, "Unknown CURL message received: %d\n",
 210                                (int)curl_message->msg);
 211                }
 212                curl_message = curl_multi_info_read(curlm, &num_messages);
 213        }
 214}
 215#endif
 216
 217static int http_options(const char *var, const char *value, void *cb)
 218{
 219        if (!strcmp("http.sslverify", var)) {
 220                curl_ssl_verify = git_config_bool(var, value);
 221                return 0;
 222        }
 223        if (!strcmp("http.sslcipherlist", var))
 224                return git_config_string(&ssl_cipherlist, var, value);
 225        if (!strcmp("http.sslversion", var))
 226                return git_config_string(&ssl_version, var, value);
 227        if (!strcmp("http.sslcert", var))
 228                return git_config_string(&ssl_cert, var, value);
 229#if LIBCURL_VERSION_NUM >= 0x070903
 230        if (!strcmp("http.sslkey", var))
 231                return git_config_string(&ssl_key, var, value);
 232#endif
 233#if LIBCURL_VERSION_NUM >= 0x070908
 234        if (!strcmp("http.sslcapath", var))
 235                return git_config_pathname(&ssl_capath, var, value);
 236#endif
 237        if (!strcmp("http.sslcainfo", var))
 238                return git_config_pathname(&ssl_cainfo, var, value);
 239        if (!strcmp("http.sslcertpasswordprotected", var)) {
 240                ssl_cert_password_required = git_config_bool(var, value);
 241                return 0;
 242        }
 243        if (!strcmp("http.ssltry", var)) {
 244                curl_ssl_try = git_config_bool(var, value);
 245                return 0;
 246        }
 247        if (!strcmp("http.minsessions", var)) {
 248                min_curl_sessions = git_config_int(var, value);
 249#ifndef USE_CURL_MULTI
 250                if (min_curl_sessions > 1)
 251                        min_curl_sessions = 1;
 252#endif
 253                return 0;
 254        }
 255#ifdef USE_CURL_MULTI
 256        if (!strcmp("http.maxrequests", var)) {
 257                max_requests = git_config_int(var, value);
 258                return 0;
 259        }
 260#endif
 261        if (!strcmp("http.lowspeedlimit", var)) {
 262                curl_low_speed_limit = (long)git_config_int(var, value);
 263                return 0;
 264        }
 265        if (!strcmp("http.lowspeedtime", var)) {
 266                curl_low_speed_time = (long)git_config_int(var, value);
 267                return 0;
 268        }
 269
 270        if (!strcmp("http.noepsv", var)) {
 271                curl_ftp_no_epsv = git_config_bool(var, value);
 272                return 0;
 273        }
 274        if (!strcmp("http.proxy", var))
 275                return git_config_string(&curl_http_proxy, var, value);
 276
 277        if (!strcmp("http.proxyauthmethod", var))
 278                return git_config_string(&http_proxy_authmethod, var, value);
 279
 280        if (!strcmp("http.cookiefile", var))
 281                return git_config_string(&curl_cookie_file, var, value);
 282        if (!strcmp("http.savecookies", var)) {
 283                curl_save_cookies = git_config_bool(var, value);
 284                return 0;
 285        }
 286
 287        if (!strcmp("http.postbuffer", var)) {
 288                http_post_buffer = git_config_int(var, value);
 289                if (http_post_buffer < LARGE_PACKET_MAX)
 290                        http_post_buffer = LARGE_PACKET_MAX;
 291                return 0;
 292        }
 293
 294        if (!strcmp("http.useragent", var))
 295                return git_config_string(&user_agent, var, value);
 296
 297        /* Fall back on the default ones */
 298        return git_default_config(var, value, cb);
 299}
 300
 301static void init_curl_http_auth(CURL *result)
 302{
 303        if (!http_auth.username)
 304                return;
 305
 306        credential_fill(&http_auth);
 307
 308#if LIBCURL_VERSION_NUM >= 0x071301
 309        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 310        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 311#else
 312        {
 313                static struct strbuf up = STRBUF_INIT;
 314                /*
 315                 * Note that we assume we only ever have a single set of
 316                 * credentials in a given program run, so we do not have
 317                 * to worry about updating this buffer, only setting its
 318                 * initial value.
 319                 */
 320                if (!up.len)
 321                        strbuf_addf(&up, "%s:%s",
 322                                http_auth.username, http_auth.password);
 323                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 324        }
 325#endif
 326}
 327
 328/* *var must be free-able */
 329static void var_override(const char **var, char *value)
 330{
 331        if (value) {
 332                free((void *)*var);
 333                *var = xstrdup(value);
 334        }
 335}
 336
 337static void init_curl_proxy_auth(CURL *result)
 338{
 339        var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 340
 341#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 342        if (http_proxy_authmethod) {
 343                int i;
 344                for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 345                        if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 346                                curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 347                                                proxy_authmethods[i].curlauth_param);
 348                                break;
 349                        }
 350                }
 351                if (i == ARRAY_SIZE(proxy_authmethods)) {
 352                        warning("unsupported proxy authentication method %s: using anyauth",
 353                                        http_proxy_authmethod);
 354                        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 355                }
 356        }
 357        else
 358                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 359#endif
 360}
 361
 362static int has_cert_password(void)
 363{
 364        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 365                return 0;
 366        if (!cert_auth.password) {
 367                cert_auth.protocol = xstrdup("cert");
 368                cert_auth.username = xstrdup("");
 369                cert_auth.path = xstrdup(ssl_cert);
 370                credential_fill(&cert_auth);
 371        }
 372        return 1;
 373}
 374
 375#if LIBCURL_VERSION_NUM >= 0x071900
 376static void set_curl_keepalive(CURL *c)
 377{
 378        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 379}
 380
 381#elif LIBCURL_VERSION_NUM >= 0x071000
 382static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 383{
 384        int ka = 1;
 385        int rc;
 386        socklen_t len = (socklen_t)sizeof(ka);
 387
 388        if (type != CURLSOCKTYPE_IPCXN)
 389                return 0;
 390
 391        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 392        if (rc < 0)
 393                warning("unable to set SO_KEEPALIVE on socket %s",
 394                        strerror(errno));
 395
 396        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 397}
 398
 399static void set_curl_keepalive(CURL *c)
 400{
 401        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 402}
 403
 404#else
 405static void set_curl_keepalive(CURL *c)
 406{
 407        /* not supported on older curl versions */
 408}
 409#endif
 410
 411static CURL *get_curl_handle(void)
 412{
 413        CURL *result = curl_easy_init();
 414        long allowed_protocols = 0;
 415
 416        if (!result)
 417                die("curl_easy_init failed");
 418
 419        if (!curl_ssl_verify) {
 420                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 421                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 422        } else {
 423                /* Verify authenticity of the peer's certificate */
 424                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 425                /* The name in the cert must match whom we tried to connect */
 426                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 427        }
 428
 429#if LIBCURL_VERSION_NUM >= 0x070907
 430        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 431#endif
 432#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 433        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 434#endif
 435
 436        if (http_proactive_auth)
 437                init_curl_http_auth(result);
 438
 439        if (getenv("GIT_SSL_VERSION"))
 440                ssl_version = getenv("GIT_SSL_VERSION");
 441        if (ssl_version && *ssl_version) {
 442                int i;
 443                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 444                        if (!strcmp(ssl_version, sslversions[i].name)) {
 445                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 446                                                 sslversions[i].ssl_version);
 447                                break;
 448                        }
 449                }
 450                if (i == ARRAY_SIZE(sslversions))
 451                        warning("unsupported ssl version %s: using default",
 452                                ssl_version);
 453        }
 454
 455        if (getenv("GIT_SSL_CIPHER_LIST"))
 456                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 457        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 458                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 459                                ssl_cipherlist);
 460
 461        if (ssl_cert != NULL)
 462                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 463        if (has_cert_password())
 464                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 465#if LIBCURL_VERSION_NUM >= 0x070903
 466        if (ssl_key != NULL)
 467                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 468#endif
 469#if LIBCURL_VERSION_NUM >= 0x070908
 470        if (ssl_capath != NULL)
 471                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 472#endif
 473        if (ssl_cainfo != NULL)
 474                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 475
 476        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 477                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 478                                 curl_low_speed_limit);
 479                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 480                                 curl_low_speed_time);
 481        }
 482
 483        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 484        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 485#if LIBCURL_VERSION_NUM >= 0x071301
 486        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 487#elif LIBCURL_VERSION_NUM >= 0x071101
 488        curl_easy_setopt(result, CURLOPT_POST301, 1);
 489#endif
 490#if LIBCURL_VERSION_NUM >= 0x071304
 491        if (is_transport_allowed("http"))
 492                allowed_protocols |= CURLPROTO_HTTP;
 493        if (is_transport_allowed("https"))
 494                allowed_protocols |= CURLPROTO_HTTPS;
 495        if (is_transport_allowed("ftp"))
 496                allowed_protocols |= CURLPROTO_FTP;
 497        if (is_transport_allowed("ftps"))
 498                allowed_protocols |= CURLPROTO_FTPS;
 499        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 500#else
 501        if (transport_restrict_protocols())
 502                warning("protocol restrictions not applied to curl redirects because\n"
 503                        "your curl version is too old (>= 7.19.4)");
 504#endif
 505
 506        if (getenv("GIT_CURL_VERBOSE"))
 507                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 508
 509        curl_easy_setopt(result, CURLOPT_USERAGENT,
 510                user_agent ? user_agent : git_user_agent());
 511
 512        if (curl_ftp_no_epsv)
 513                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 514
 515#ifdef CURLOPT_USE_SSL
 516        if (curl_ssl_try)
 517                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 518#endif
 519
 520        if (curl_http_proxy) {
 521                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 522#if LIBCURL_VERSION_NUM >= 0x071800
 523                if (starts_with(curl_http_proxy, "socks5"))
 524                        curl_easy_setopt(result,
 525                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 526                else if (starts_with(curl_http_proxy, "socks4a"))
 527                        curl_easy_setopt(result,
 528                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 529                else if (starts_with(curl_http_proxy, "socks"))
 530                        curl_easy_setopt(result,
 531                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 532#endif
 533        }
 534        init_curl_proxy_auth(result);
 535
 536        set_curl_keepalive(result);
 537
 538        return result;
 539}
 540
 541static void set_from_env(const char **var, const char *envname)
 542{
 543        const char *val = getenv(envname);
 544        if (val)
 545                *var = val;
 546}
 547
 548void http_init(struct remote *remote, const char *url, int proactive_auth)
 549{
 550        char *low_speed_limit;
 551        char *low_speed_time;
 552        char *normalized_url;
 553        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 554
 555        config.section = "http";
 556        config.key = NULL;
 557        config.collect_fn = http_options;
 558        config.cascade_fn = git_default_config;
 559        config.cb = NULL;
 560
 561        http_is_verbose = 0;
 562        normalized_url = url_normalize(url, &config.url);
 563
 564        git_config(urlmatch_config_entry, &config);
 565        free(normalized_url);
 566
 567        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 568                die("curl_global_init failed");
 569
 570        http_proactive_auth = proactive_auth;
 571
 572        if (remote && remote->http_proxy)
 573                curl_http_proxy = xstrdup(remote->http_proxy);
 574
 575        if (remote)
 576                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 577
 578        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 579        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 580
 581#ifdef USE_CURL_MULTI
 582        {
 583                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 584                if (http_max_requests != NULL)
 585                        max_requests = atoi(http_max_requests);
 586        }
 587
 588        curlm = curl_multi_init();
 589        if (!curlm)
 590                die("curl_multi_init failed");
 591#endif
 592
 593        if (getenv("GIT_SSL_NO_VERIFY"))
 594                curl_ssl_verify = 0;
 595
 596        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 597#if LIBCURL_VERSION_NUM >= 0x070903
 598        set_from_env(&ssl_key, "GIT_SSL_KEY");
 599#endif
 600#if LIBCURL_VERSION_NUM >= 0x070908
 601        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 602#endif
 603        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 604
 605        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 606
 607        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 608        if (low_speed_limit != NULL)
 609                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 610        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 611        if (low_speed_time != NULL)
 612                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 613
 614        if (curl_ssl_verify == -1)
 615                curl_ssl_verify = 1;
 616
 617        curl_session_count = 0;
 618#ifdef USE_CURL_MULTI
 619        if (max_requests < 1)
 620                max_requests = DEFAULT_MAX_REQUESTS;
 621#endif
 622
 623        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 624                curl_ftp_no_epsv = 1;
 625
 626        if (url) {
 627                credential_from_url(&http_auth, url);
 628                if (!ssl_cert_password_required &&
 629                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 630                    starts_with(url, "https://"))
 631                        ssl_cert_password_required = 1;
 632        }
 633
 634#ifndef NO_CURL_EASY_DUPHANDLE
 635        curl_default = get_curl_handle();
 636#endif
 637}
 638
 639void http_cleanup(void)
 640{
 641        struct active_request_slot *slot = active_queue_head;
 642
 643        while (slot != NULL) {
 644                struct active_request_slot *next = slot->next;
 645                if (slot->curl != NULL) {
 646#ifdef USE_CURL_MULTI
 647                        curl_multi_remove_handle(curlm, slot->curl);
 648#endif
 649                        curl_easy_cleanup(slot->curl);
 650                }
 651                free(slot);
 652                slot = next;
 653        }
 654        active_queue_head = NULL;
 655
 656#ifndef NO_CURL_EASY_DUPHANDLE
 657        curl_easy_cleanup(curl_default);
 658#endif
 659
 660#ifdef USE_CURL_MULTI
 661        curl_multi_cleanup(curlm);
 662#endif
 663        curl_global_cleanup();
 664
 665        curl_slist_free_all(pragma_header);
 666        pragma_header = NULL;
 667
 668        curl_slist_free_all(no_pragma_header);
 669        no_pragma_header = NULL;
 670
 671        if (curl_http_proxy) {
 672                free((void *)curl_http_proxy);
 673                curl_http_proxy = NULL;
 674        }
 675
 676        free((void *)http_proxy_authmethod);
 677        http_proxy_authmethod = NULL;
 678
 679        if (cert_auth.password != NULL) {
 680                memset(cert_auth.password, 0, strlen(cert_auth.password));
 681                free(cert_auth.password);
 682                cert_auth.password = NULL;
 683        }
 684        ssl_cert_password_required = 0;
 685
 686        free(cached_accept_language);
 687        cached_accept_language = NULL;
 688}
 689
 690struct active_request_slot *get_active_slot(void)
 691{
 692        struct active_request_slot *slot = active_queue_head;
 693        struct active_request_slot *newslot;
 694
 695#ifdef USE_CURL_MULTI
 696        int num_transfers;
 697
 698        /* Wait for a slot to open up if the queue is full */
 699        while (active_requests >= max_requests) {
 700                curl_multi_perform(curlm, &num_transfers);
 701                if (num_transfers < active_requests)
 702                        process_curl_messages();
 703        }
 704#endif
 705
 706        while (slot != NULL && slot->in_use)
 707                slot = slot->next;
 708
 709        if (slot == NULL) {
 710                newslot = xmalloc(sizeof(*newslot));
 711                newslot->curl = NULL;
 712                newslot->in_use = 0;
 713                newslot->next = NULL;
 714
 715                slot = active_queue_head;
 716                if (slot == NULL) {
 717                        active_queue_head = newslot;
 718                } else {
 719                        while (slot->next != NULL)
 720                                slot = slot->next;
 721                        slot->next = newslot;
 722                }
 723                slot = newslot;
 724        }
 725
 726        if (slot->curl == NULL) {
 727#ifdef NO_CURL_EASY_DUPHANDLE
 728                slot->curl = get_curl_handle();
 729#else
 730                slot->curl = curl_easy_duphandle(curl_default);
 731#endif
 732                curl_session_count++;
 733        }
 734
 735        active_requests++;
 736        slot->in_use = 1;
 737        slot->results = NULL;
 738        slot->finished = NULL;
 739        slot->callback_data = NULL;
 740        slot->callback_func = NULL;
 741        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 742        if (curl_save_cookies)
 743                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 744        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 745        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 746        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 747        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 748        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 749        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 750        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 751        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 752        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 753        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
 754#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 755        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 756#endif
 757        if (http_auth.password)
 758                init_curl_http_auth(slot->curl);
 759
 760        return slot;
 761}
 762
 763int start_active_slot(struct active_request_slot *slot)
 764{
 765#ifdef USE_CURL_MULTI
 766        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 767        int num_transfers;
 768
 769        if (curlm_result != CURLM_OK &&
 770            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 771                active_requests--;
 772                slot->in_use = 0;
 773                return 0;
 774        }
 775
 776        /*
 777         * We know there must be something to do, since we just added
 778         * something.
 779         */
 780        curl_multi_perform(curlm, &num_transfers);
 781#endif
 782        return 1;
 783}
 784
 785#ifdef USE_CURL_MULTI
 786struct fill_chain {
 787        void *data;
 788        int (*fill)(void *);
 789        struct fill_chain *next;
 790};
 791
 792static struct fill_chain *fill_cfg;
 793
 794void add_fill_function(void *data, int (*fill)(void *))
 795{
 796        struct fill_chain *new = xmalloc(sizeof(*new));
 797        struct fill_chain **linkp = &fill_cfg;
 798        new->data = data;
 799        new->fill = fill;
 800        new->next = NULL;
 801        while (*linkp)
 802                linkp = &(*linkp)->next;
 803        *linkp = new;
 804}
 805
 806void fill_active_slots(void)
 807{
 808        struct active_request_slot *slot = active_queue_head;
 809
 810        while (active_requests < max_requests) {
 811                struct fill_chain *fill;
 812                for (fill = fill_cfg; fill; fill = fill->next)
 813                        if (fill->fill(fill->data))
 814                                break;
 815
 816                if (!fill)
 817                        break;
 818        }
 819
 820        while (slot != NULL) {
 821                if (!slot->in_use && slot->curl != NULL
 822                        && curl_session_count > min_curl_sessions) {
 823                        curl_easy_cleanup(slot->curl);
 824                        slot->curl = NULL;
 825                        curl_session_count--;
 826                }
 827                slot = slot->next;
 828        }
 829}
 830
 831void step_active_slots(void)
 832{
 833        int num_transfers;
 834        CURLMcode curlm_result;
 835
 836        do {
 837                curlm_result = curl_multi_perform(curlm, &num_transfers);
 838        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 839        if (num_transfers < active_requests) {
 840                process_curl_messages();
 841                fill_active_slots();
 842        }
 843}
 844#endif
 845
 846void run_active_slot(struct active_request_slot *slot)
 847{
 848#ifdef USE_CURL_MULTI
 849        fd_set readfds;
 850        fd_set writefds;
 851        fd_set excfds;
 852        int max_fd;
 853        struct timeval select_timeout;
 854        int finished = 0;
 855
 856        slot->finished = &finished;
 857        while (!finished) {
 858                step_active_slots();
 859
 860                if (slot->in_use) {
 861#if LIBCURL_VERSION_NUM >= 0x070f04
 862                        long curl_timeout;
 863                        curl_multi_timeout(curlm, &curl_timeout);
 864                        if (curl_timeout == 0) {
 865                                continue;
 866                        } else if (curl_timeout == -1) {
 867                                select_timeout.tv_sec  = 0;
 868                                select_timeout.tv_usec = 50000;
 869                        } else {
 870                                select_timeout.tv_sec  =  curl_timeout / 1000;
 871                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 872                        }
 873#else
 874                        select_timeout.tv_sec  = 0;
 875                        select_timeout.tv_usec = 50000;
 876#endif
 877
 878                        max_fd = -1;
 879                        FD_ZERO(&readfds);
 880                        FD_ZERO(&writefds);
 881                        FD_ZERO(&excfds);
 882                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 883
 884                        /*
 885                         * It can happen that curl_multi_timeout returns a pathologically
 886                         * long timeout when curl_multi_fdset returns no file descriptors
 887                         * to read.  See commit message for more details.
 888                         */
 889                        if (max_fd < 0 &&
 890                            (select_timeout.tv_sec > 0 ||
 891                             select_timeout.tv_usec > 50000)) {
 892                                select_timeout.tv_sec  = 0;
 893                                select_timeout.tv_usec = 50000;
 894                        }
 895
 896                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 897                }
 898        }
 899#else
 900        while (slot->in_use) {
 901                slot->curl_result = curl_easy_perform(slot->curl);
 902                finish_active_slot(slot);
 903        }
 904#endif
 905}
 906
 907static void release_active_slot(struct active_request_slot *slot)
 908{
 909        closedown_active_slot(slot);
 910        if (slot->curl && curl_session_count > min_curl_sessions) {
 911#ifdef USE_CURL_MULTI
 912                curl_multi_remove_handle(curlm, slot->curl);
 913#endif
 914                curl_easy_cleanup(slot->curl);
 915                slot->curl = NULL;
 916                curl_session_count--;
 917        }
 918#ifdef USE_CURL_MULTI
 919        fill_active_slots();
 920#endif
 921}
 922
 923void finish_all_active_slots(void)
 924{
 925        struct active_request_slot *slot = active_queue_head;
 926
 927        while (slot != NULL)
 928                if (slot->in_use) {
 929                        run_active_slot(slot);
 930                        slot = active_queue_head;
 931                } else {
 932                        slot = slot->next;
 933                }
 934}
 935
 936/* Helpers for modifying and creating URLs */
 937static inline int needs_quote(int ch)
 938{
 939        if (((ch >= 'A') && (ch <= 'Z'))
 940                        || ((ch >= 'a') && (ch <= 'z'))
 941                        || ((ch >= '0') && (ch <= '9'))
 942                        || (ch == '/')
 943                        || (ch == '-')
 944                        || (ch == '.'))
 945                return 0;
 946        return 1;
 947}
 948
 949static char *quote_ref_url(const char *base, const char *ref)
 950{
 951        struct strbuf buf = STRBUF_INIT;
 952        const char *cp;
 953        int ch;
 954
 955        end_url_with_slash(&buf, base);
 956
 957        for (cp = ref; (ch = *cp) != 0; cp++)
 958                if (needs_quote(ch))
 959                        strbuf_addf(&buf, "%%%02x", ch);
 960                else
 961                        strbuf_addch(&buf, *cp);
 962
 963        return strbuf_detach(&buf, NULL);
 964}
 965
 966void append_remote_object_url(struct strbuf *buf, const char *url,
 967                              const char *hex,
 968                              int only_two_digit_prefix)
 969{
 970        end_url_with_slash(buf, url);
 971
 972        strbuf_addf(buf, "objects/%.*s/", 2, hex);
 973        if (!only_two_digit_prefix)
 974                strbuf_addf(buf, "%s", hex+2);
 975}
 976
 977char *get_remote_object_url(const char *url, const char *hex,
 978                            int only_two_digit_prefix)
 979{
 980        struct strbuf buf = STRBUF_INIT;
 981        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 982        return strbuf_detach(&buf, NULL);
 983}
 984
 985static int handle_curl_result(struct slot_results *results)
 986{
 987        /*
 988         * If we see a failing http code with CURLE_OK, we have turned off
 989         * FAILONERROR (to keep the server's custom error response), and should
 990         * translate the code into failure here.
 991         */
 992        if (results->curl_result == CURLE_OK &&
 993            results->http_code >= 400) {
 994                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
 995                /*
 996                 * Normally curl will already have put the "reason phrase"
 997                 * from the server into curl_errorstr; unfortunately without
 998                 * FAILONERROR it is lost, so we can give only the numeric
 999                 * status code.
1000                 */
1001                snprintf(curl_errorstr, sizeof(curl_errorstr),
1002                         "The requested URL returned error: %ld",
1003                         results->http_code);
1004        }
1005
1006        if (results->curl_result == CURLE_OK) {
1007                credential_approve(&http_auth);
1008                return HTTP_OK;
1009        } else if (missing_target(results))
1010                return HTTP_MISSING_TARGET;
1011        else if (results->http_code == 401) {
1012                if (http_auth.username && http_auth.password) {
1013                        credential_reject(&http_auth);
1014                        return HTTP_NOAUTH;
1015                } else {
1016#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1017                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1018#endif
1019                        return HTTP_REAUTH;
1020                }
1021        } else {
1022#if LIBCURL_VERSION_NUM >= 0x070c00
1023                if (!curl_errorstr[0])
1024                        strlcpy(curl_errorstr,
1025                                curl_easy_strerror(results->curl_result),
1026                                sizeof(curl_errorstr));
1027#endif
1028                return HTTP_ERROR;
1029        }
1030}
1031
1032int run_one_slot(struct active_request_slot *slot,
1033                 struct slot_results *results)
1034{
1035        slot->results = results;
1036        if (!start_active_slot(slot)) {
1037                snprintf(curl_errorstr, sizeof(curl_errorstr),
1038                         "failed to start HTTP request");
1039                return HTTP_START_FAILED;
1040        }
1041
1042        run_active_slot(slot);
1043        return handle_curl_result(results);
1044}
1045
1046static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1047{
1048        char *ptr;
1049        CURLcode ret;
1050
1051        strbuf_reset(buf);
1052        ret = curl_easy_getinfo(curl, info, &ptr);
1053        if (!ret && ptr)
1054                strbuf_addstr(buf, ptr);
1055        return ret;
1056}
1057
1058/*
1059 * Check for and extract a content-type parameter. "raw"
1060 * should be positioned at the start of the potential
1061 * parameter, with any whitespace already removed.
1062 *
1063 * "name" is the name of the parameter. The value is appended
1064 * to "out".
1065 */
1066static int extract_param(const char *raw, const char *name,
1067                         struct strbuf *out)
1068{
1069        size_t len = strlen(name);
1070
1071        if (strncasecmp(raw, name, len))
1072                return -1;
1073        raw += len;
1074
1075        if (*raw != '=')
1076                return -1;
1077        raw++;
1078
1079        while (*raw && !isspace(*raw) && *raw != ';')
1080                strbuf_addch(out, *raw++);
1081        return 0;
1082}
1083
1084/*
1085 * Extract a normalized version of the content type, with any
1086 * spaces suppressed, all letters lowercased, and no trailing ";"
1087 * or parameters.
1088 *
1089 * Note that we will silently remove even invalid whitespace. For
1090 * example, "text / plain" is specifically forbidden by RFC 2616,
1091 * but "text/plain" is the only reasonable output, and this keeps
1092 * our code simple.
1093 *
1094 * If the "charset" argument is not NULL, store the value of any
1095 * charset parameter there.
1096 *
1097 * Example:
1098 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1099 *   "text / plain" -> "text/plain"
1100 */
1101static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1102                                 struct strbuf *charset)
1103{
1104        const char *p;
1105
1106        strbuf_reset(type);
1107        strbuf_grow(type, raw->len);
1108        for (p = raw->buf; *p; p++) {
1109                if (isspace(*p))
1110                        continue;
1111                if (*p == ';') {
1112                        p++;
1113                        break;
1114                }
1115                strbuf_addch(type, tolower(*p));
1116        }
1117
1118        if (!charset)
1119                return;
1120
1121        strbuf_reset(charset);
1122        while (*p) {
1123                while (isspace(*p) || *p == ';')
1124                        p++;
1125                if (!extract_param(p, "charset", charset))
1126                        return;
1127                while (*p && !isspace(*p))
1128                        p++;
1129        }
1130
1131        if (!charset->len && starts_with(type->buf, "text/"))
1132                strbuf_addstr(charset, "ISO-8859-1");
1133}
1134
1135static void write_accept_language(struct strbuf *buf)
1136{
1137        /*
1138         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1139         * that, q-value will be smaller than 0.001, the minimum q-value the
1140         * HTTP specification allows. See
1141         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1142         */
1143        const int MAX_DECIMAL_PLACES = 3;
1144        const int MAX_LANGUAGE_TAGS = 1000;
1145        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1146        char **language_tags = NULL;
1147        int num_langs = 0;
1148        const char *s = get_preferred_languages();
1149        int i;
1150        struct strbuf tag = STRBUF_INIT;
1151
1152        /* Don't add Accept-Language header if no language is preferred. */
1153        if (!s)
1154                return;
1155
1156        /*
1157         * Split the colon-separated string of preferred languages into
1158         * language_tags array.
1159         */
1160        do {
1161                /* collect language tag */
1162                for (; *s && (isalnum(*s) || *s == '_'); s++)
1163                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1164
1165                /* skip .codeset, @modifier and any other unnecessary parts */
1166                while (*s && *s != ':')
1167                        s++;
1168
1169                if (tag.len) {
1170                        num_langs++;
1171                        REALLOC_ARRAY(language_tags, num_langs);
1172                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1173                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1174                                break;
1175                }
1176        } while (*s++);
1177
1178        /* write Accept-Language header into buf */
1179        if (num_langs) {
1180                int last_buf_len = 0;
1181                int max_q;
1182                int decimal_places;
1183                char q_format[32];
1184
1185                /* add '*' */
1186                REALLOC_ARRAY(language_tags, num_langs + 1);
1187                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1188
1189                /* compute decimal_places */
1190                for (max_q = 1, decimal_places = 0;
1191                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1192                     decimal_places++, max_q *= 10)
1193                        ;
1194
1195                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1196
1197                strbuf_addstr(buf, "Accept-Language: ");
1198
1199                for (i = 0; i < num_langs; i++) {
1200                        if (i > 0)
1201                                strbuf_addstr(buf, ", ");
1202
1203                        strbuf_addstr(buf, language_tags[i]);
1204
1205                        if (i > 0)
1206                                strbuf_addf(buf, q_format, max_q - i);
1207
1208                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1209                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1210                                break;
1211                        }
1212
1213                        last_buf_len = buf->len;
1214                }
1215        }
1216
1217        /* free language tags -- last one is a static '*' */
1218        for (i = 0; i < num_langs - 1; i++)
1219                free(language_tags[i]);
1220        free(language_tags);
1221}
1222
1223/*
1224 * Get an Accept-Language header which indicates user's preferred languages.
1225 *
1226 * Examples:
1227 *   LANGUAGE= -> ""
1228 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1229 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1230 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1231 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1232 *   LANGUAGE= LANG=C -> ""
1233 */
1234static const char *get_accept_language(void)
1235{
1236        if (!cached_accept_language) {
1237                struct strbuf buf = STRBUF_INIT;
1238                write_accept_language(&buf);
1239                if (buf.len > 0)
1240                        cached_accept_language = strbuf_detach(&buf, NULL);
1241        }
1242
1243        return cached_accept_language;
1244}
1245
1246static void http_opt_request_remainder(CURL *curl, off_t pos)
1247{
1248        char buf[128];
1249        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1250        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1251}
1252
1253/* http_request() targets */
1254#define HTTP_REQUEST_STRBUF     0
1255#define HTTP_REQUEST_FILE       1
1256
1257static int http_request(const char *url,
1258                        void *result, int target,
1259                        const struct http_get_options *options)
1260{
1261        struct active_request_slot *slot;
1262        struct slot_results results;
1263        struct curl_slist *headers = NULL;
1264        struct strbuf buf = STRBUF_INIT;
1265        const char *accept_language;
1266        int ret;
1267
1268        slot = get_active_slot();
1269        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1270
1271        if (result == NULL) {
1272                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1273        } else {
1274                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1275                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1276
1277                if (target == HTTP_REQUEST_FILE) {
1278                        off_t posn = ftello(result);
1279                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1280                                         fwrite);
1281                        if (posn > 0)
1282                                http_opt_request_remainder(slot->curl, posn);
1283                } else
1284                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1285                                         fwrite_buffer);
1286        }
1287
1288        accept_language = get_accept_language();
1289
1290        if (accept_language)
1291                headers = curl_slist_append(headers, accept_language);
1292
1293        strbuf_addstr(&buf, "Pragma:");
1294        if (options && options->no_cache)
1295                strbuf_addstr(&buf, " no-cache");
1296        if (options && options->keep_error)
1297                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1298
1299        headers = curl_slist_append(headers, buf.buf);
1300
1301        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1302        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1303        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1304
1305        ret = run_one_slot(slot, &results);
1306
1307        if (options && options->content_type) {
1308                struct strbuf raw = STRBUF_INIT;
1309                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1310                extract_content_type(&raw, options->content_type,
1311                                     options->charset);
1312                strbuf_release(&raw);
1313        }
1314
1315        if (options && options->effective_url)
1316                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1317                                options->effective_url);
1318
1319        curl_slist_free_all(headers);
1320        strbuf_release(&buf);
1321
1322        return ret;
1323}
1324
1325/*
1326 * Update the "base" url to a more appropriate value, as deduced by
1327 * redirects seen when requesting a URL starting with "url".
1328 *
1329 * The "asked" parameter is a URL that we asked curl to access, and must begin
1330 * with "base".
1331 *
1332 * The "got" parameter is the URL that curl reported to us as where we ended
1333 * up.
1334 *
1335 * Returns 1 if we updated the base url, 0 otherwise.
1336 *
1337 * Our basic strategy is to compare "base" and "asked" to find the bits
1338 * specific to our request. We then strip those bits off of "got" to yield the
1339 * new base. So for example, if our base is "http://example.com/foo.git",
1340 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1341 * with "https://other.example.com/foo.git/info/refs". We would want the
1342 * new URL to become "https://other.example.com/foo.git".
1343 *
1344 * Note that this assumes a sane redirect scheme. It's entirely possible
1345 * in the example above to end up at a URL that does not even end in
1346 * "info/refs".  In such a case we simply punt, as there is not much we can
1347 * do (and such a scheme is unlikely to represent a real git repository,
1348 * which means we are likely about to abort anyway).
1349 */
1350static int update_url_from_redirect(struct strbuf *base,
1351                                    const char *asked,
1352                                    const struct strbuf *got)
1353{
1354        const char *tail;
1355        size_t tail_len;
1356
1357        if (!strcmp(asked, got->buf))
1358                return 0;
1359
1360        if (!skip_prefix(asked, base->buf, &tail))
1361                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1362                    asked, base->buf);
1363
1364        tail_len = strlen(tail);
1365
1366        if (got->len < tail_len ||
1367            strcmp(tail, got->buf + got->len - tail_len))
1368                return 0; /* insane redirect scheme */
1369
1370        strbuf_reset(base);
1371        strbuf_add(base, got->buf, got->len - tail_len);
1372        return 1;
1373}
1374
1375static int http_request_reauth(const char *url,
1376                               void *result, int target,
1377                               struct http_get_options *options)
1378{
1379        int ret = http_request(url, result, target, options);
1380
1381        if (options && options->effective_url && options->base_url) {
1382                if (update_url_from_redirect(options->base_url,
1383                                             url, options->effective_url)) {
1384                        credential_from_url(&http_auth, options->base_url->buf);
1385                        url = options->effective_url->buf;
1386                }
1387        }
1388
1389        if (ret != HTTP_REAUTH)
1390                return ret;
1391
1392        /*
1393         * If we are using KEEP_ERROR, the previous request may have
1394         * put cruft into our output stream; we should clear it out before
1395         * making our next request. We only know how to do this for
1396         * the strbuf case, but that is enough to satisfy current callers.
1397         */
1398        if (options && options->keep_error) {
1399                switch (target) {
1400                case HTTP_REQUEST_STRBUF:
1401                        strbuf_reset(result);
1402                        break;
1403                default:
1404                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1405                }
1406        }
1407
1408        credential_fill(&http_auth);
1409
1410        return http_request(url, result, target, options);
1411}
1412
1413int http_get_strbuf(const char *url,
1414                    struct strbuf *result,
1415                    struct http_get_options *options)
1416{
1417        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1418}
1419
1420/*
1421 * Downloads a URL and stores the result in the given file.
1422 *
1423 * If a previous interrupted download is detected (i.e. a previous temporary
1424 * file is still around) the download is resumed.
1425 */
1426static int http_get_file(const char *url, const char *filename,
1427                         struct http_get_options *options)
1428{
1429        int ret;
1430        struct strbuf tmpfile = STRBUF_INIT;
1431        FILE *result;
1432
1433        strbuf_addf(&tmpfile, "%s.temp", filename);
1434        result = fopen(tmpfile.buf, "a");
1435        if (!result) {
1436                error("Unable to open local file %s", tmpfile.buf);
1437                ret = HTTP_ERROR;
1438                goto cleanup;
1439        }
1440
1441        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1442        fclose(result);
1443
1444        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1445                ret = HTTP_ERROR;
1446cleanup:
1447        strbuf_release(&tmpfile);
1448        return ret;
1449}
1450
1451int http_fetch_ref(const char *base, struct ref *ref)
1452{
1453        struct http_get_options options = {0};
1454        char *url;
1455        struct strbuf buffer = STRBUF_INIT;
1456        int ret = -1;
1457
1458        options.no_cache = 1;
1459
1460        url = quote_ref_url(base, ref->name);
1461        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1462                strbuf_rtrim(&buffer);
1463                if (buffer.len == 40)
1464                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
1465                else if (starts_with(buffer.buf, "ref: ")) {
1466                        ref->symref = xstrdup(buffer.buf + 5);
1467                        ret = 0;
1468                }
1469        }
1470
1471        strbuf_release(&buffer);
1472        free(url);
1473        return ret;
1474}
1475
1476/* Helpers for fetching packs */
1477static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1478{
1479        char *url, *tmp;
1480        struct strbuf buf = STRBUF_INIT;
1481
1482        if (http_is_verbose)
1483                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1484
1485        end_url_with_slash(&buf, base_url);
1486        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1487        url = strbuf_detach(&buf, NULL);
1488
1489        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1490        tmp = strbuf_detach(&buf, NULL);
1491
1492        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1493                error("Unable to get pack index %s", url);
1494                free(tmp);
1495                tmp = NULL;
1496        }
1497
1498        free(url);
1499        return tmp;
1500}
1501
1502static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1503        unsigned char *sha1, const char *base_url)
1504{
1505        struct packed_git *new_pack;
1506        char *tmp_idx = NULL;
1507        int ret;
1508
1509        if (has_pack_index(sha1)) {
1510                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1511                if (!new_pack)
1512                        return -1; /* parse_pack_index() already issued error message */
1513                goto add_pack;
1514        }
1515
1516        tmp_idx = fetch_pack_index(sha1, base_url);
1517        if (!tmp_idx)
1518                return -1;
1519
1520        new_pack = parse_pack_index(sha1, tmp_idx);
1521        if (!new_pack) {
1522                unlink(tmp_idx);
1523                free(tmp_idx);
1524
1525                return -1; /* parse_pack_index() already issued error message */
1526        }
1527
1528        ret = verify_pack_index(new_pack);
1529        if (!ret) {
1530                close_pack_index(new_pack);
1531                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1532        }
1533        free(tmp_idx);
1534        if (ret)
1535                return -1;
1536
1537add_pack:
1538        new_pack->next = *packs_head;
1539        *packs_head = new_pack;
1540        return 0;
1541}
1542
1543int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1544{
1545        struct http_get_options options = {0};
1546        int ret = 0, i = 0;
1547        char *url, *data;
1548        struct strbuf buf = STRBUF_INIT;
1549        unsigned char sha1[20];
1550
1551        end_url_with_slash(&buf, base_url);
1552        strbuf_addstr(&buf, "objects/info/packs");
1553        url = strbuf_detach(&buf, NULL);
1554
1555        options.no_cache = 1;
1556        ret = http_get_strbuf(url, &buf, &options);
1557        if (ret != HTTP_OK)
1558                goto cleanup;
1559
1560        data = buf.buf;
1561        while (i < buf.len) {
1562                switch (data[i]) {
1563                case 'P':
1564                        i++;
1565                        if (i + 52 <= buf.len &&
1566                            starts_with(data + i, " pack-") &&
1567                            starts_with(data + i + 46, ".pack\n")) {
1568                                get_sha1_hex(data + i + 6, sha1);
1569                                fetch_and_setup_pack_index(packs_head, sha1,
1570                                                      base_url);
1571                                i += 51;
1572                                break;
1573                        }
1574                default:
1575                        while (i < buf.len && data[i] != '\n')
1576                                i++;
1577                }
1578                i++;
1579        }
1580
1581cleanup:
1582        free(url);
1583        return ret;
1584}
1585
1586void release_http_pack_request(struct http_pack_request *preq)
1587{
1588        if (preq->packfile != NULL) {
1589                fclose(preq->packfile);
1590                preq->packfile = NULL;
1591        }
1592        preq->slot = NULL;
1593        free(preq->url);
1594        free(preq);
1595}
1596
1597int finish_http_pack_request(struct http_pack_request *preq)
1598{
1599        struct packed_git **lst;
1600        struct packed_git *p = preq->target;
1601        char *tmp_idx;
1602        size_t len;
1603        struct child_process ip = CHILD_PROCESS_INIT;
1604        const char *ip_argv[8];
1605
1606        close_pack_index(p);
1607
1608        fclose(preq->packfile);
1609        preq->packfile = NULL;
1610
1611        lst = preq->lst;
1612        while (*lst != p)
1613                lst = &((*lst)->next);
1614        *lst = (*lst)->next;
1615
1616        if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1617                die("BUG: pack tmpfile does not end in .pack.temp?");
1618        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1619
1620        ip_argv[0] = "index-pack";
1621        ip_argv[1] = "-o";
1622        ip_argv[2] = tmp_idx;
1623        ip_argv[3] = preq->tmpfile;
1624        ip_argv[4] = NULL;
1625
1626        ip.argv = ip_argv;
1627        ip.git_cmd = 1;
1628        ip.no_stdin = 1;
1629        ip.no_stdout = 1;
1630
1631        if (run_command(&ip)) {
1632                unlink(preq->tmpfile);
1633                unlink(tmp_idx);
1634                free(tmp_idx);
1635                return -1;
1636        }
1637
1638        unlink(sha1_pack_index_name(p->sha1));
1639
1640        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1641         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1642                free(tmp_idx);
1643                return -1;
1644        }
1645
1646        install_packed_git(p);
1647        free(tmp_idx);
1648        return 0;
1649}
1650
1651struct http_pack_request *new_http_pack_request(
1652        struct packed_git *target, const char *base_url)
1653{
1654        off_t prev_posn = 0;
1655        struct strbuf buf = STRBUF_INIT;
1656        struct http_pack_request *preq;
1657
1658        preq = xcalloc(1, sizeof(*preq));
1659        preq->target = target;
1660
1661        end_url_with_slash(&buf, base_url);
1662        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1663                sha1_to_hex(target->sha1));
1664        preq->url = strbuf_detach(&buf, NULL);
1665
1666        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1667                sha1_pack_name(target->sha1));
1668        preq->packfile = fopen(preq->tmpfile, "a");
1669        if (!preq->packfile) {
1670                error("Unable to open local file %s for pack",
1671                      preq->tmpfile);
1672                goto abort;
1673        }
1674
1675        preq->slot = get_active_slot();
1676        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1677        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1678        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1679        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1680                no_pragma_header);
1681
1682        /*
1683         * If there is data present from a previous transfer attempt,
1684         * resume where it left off
1685         */
1686        prev_posn = ftello(preq->packfile);
1687        if (prev_posn>0) {
1688                if (http_is_verbose)
1689                        fprintf(stderr,
1690                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1691                                sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1692                http_opt_request_remainder(preq->slot->curl, prev_posn);
1693        }
1694
1695        return preq;
1696
1697abort:
1698        free(preq->url);
1699        free(preq);
1700        return NULL;
1701}
1702
1703/* Helpers for fetching objects (loose) */
1704static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1705                               void *data)
1706{
1707        unsigned char expn[4096];
1708        size_t size = eltsize * nmemb;
1709        int posn = 0;
1710        struct http_object_request *freq =
1711                (struct http_object_request *)data;
1712        do {
1713                ssize_t retval = xwrite(freq->localfile,
1714                                        (char *) ptr + posn, size - posn);
1715                if (retval < 0)
1716                        return posn;
1717                posn += retval;
1718        } while (posn < size);
1719
1720        freq->stream.avail_in = size;
1721        freq->stream.next_in = (void *)ptr;
1722        do {
1723                freq->stream.next_out = expn;
1724                freq->stream.avail_out = sizeof(expn);
1725                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1726                git_SHA1_Update(&freq->c, expn,
1727                                sizeof(expn) - freq->stream.avail_out);
1728        } while (freq->stream.avail_in && freq->zret == Z_OK);
1729        return size;
1730}
1731
1732struct http_object_request *new_http_object_request(const char *base_url,
1733        unsigned char *sha1)
1734{
1735        char *hex = sha1_to_hex(sha1);
1736        const char *filename;
1737        char prevfile[PATH_MAX];
1738        int prevlocal;
1739        char prev_buf[PREV_BUF_SIZE];
1740        ssize_t prev_read = 0;
1741        off_t prev_posn = 0;
1742        struct http_object_request *freq;
1743
1744        freq = xcalloc(1, sizeof(*freq));
1745        hashcpy(freq->sha1, sha1);
1746        freq->localfile = -1;
1747
1748        filename = sha1_file_name(sha1);
1749        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1750                 "%s.temp", filename);
1751
1752        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1753        unlink_or_warn(prevfile);
1754        rename(freq->tmpfile, prevfile);
1755        unlink_or_warn(freq->tmpfile);
1756
1757        if (freq->localfile != -1)
1758                error("fd leakage in start: %d", freq->localfile);
1759        freq->localfile = open(freq->tmpfile,
1760                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1761        /*
1762         * This could have failed due to the "lazy directory creation";
1763         * try to mkdir the last path component.
1764         */
1765        if (freq->localfile < 0 && errno == ENOENT) {
1766                char *dir = strrchr(freq->tmpfile, '/');
1767                if (dir) {
1768                        *dir = 0;
1769                        mkdir(freq->tmpfile, 0777);
1770                        *dir = '/';
1771                }
1772                freq->localfile = open(freq->tmpfile,
1773                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1774        }
1775
1776        if (freq->localfile < 0) {
1777                error("Couldn't create temporary file %s: %s",
1778                      freq->tmpfile, strerror(errno));
1779                goto abort;
1780        }
1781
1782        git_inflate_init(&freq->stream);
1783
1784        git_SHA1_Init(&freq->c);
1785
1786        freq->url = get_remote_object_url(base_url, hex, 0);
1787
1788        /*
1789         * If a previous temp file is present, process what was already
1790         * fetched.
1791         */
1792        prevlocal = open(prevfile, O_RDONLY);
1793        if (prevlocal != -1) {
1794                do {
1795                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1796                        if (prev_read>0) {
1797                                if (fwrite_sha1_file(prev_buf,
1798                                                     1,
1799                                                     prev_read,
1800                                                     freq) == prev_read) {
1801                                        prev_posn += prev_read;
1802                                } else {
1803                                        prev_read = -1;
1804                                }
1805                        }
1806                } while (prev_read > 0);
1807                close(prevlocal);
1808        }
1809        unlink_or_warn(prevfile);
1810
1811        /*
1812         * Reset inflate/SHA1 if there was an error reading the previous temp
1813         * file; also rewind to the beginning of the local file.
1814         */
1815        if (prev_read == -1) {
1816                memset(&freq->stream, 0, sizeof(freq->stream));
1817                git_inflate_init(&freq->stream);
1818                git_SHA1_Init(&freq->c);
1819                if (prev_posn>0) {
1820                        prev_posn = 0;
1821                        lseek(freq->localfile, 0, SEEK_SET);
1822                        if (ftruncate(freq->localfile, 0) < 0) {
1823                                error("Couldn't truncate temporary file %s: %s",
1824                                          freq->tmpfile, strerror(errno));
1825                                goto abort;
1826                        }
1827                }
1828        }
1829
1830        freq->slot = get_active_slot();
1831
1832        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1833        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1834        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1835        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1836        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1837
1838        /*
1839         * If we have successfully processed data from a previous fetch
1840         * attempt, only fetch the data we don't already have.
1841         */
1842        if (prev_posn>0) {
1843                if (http_is_verbose)
1844                        fprintf(stderr,
1845                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1846                                hex, (uintmax_t)prev_posn);
1847                http_opt_request_remainder(freq->slot->curl, prev_posn);
1848        }
1849
1850        return freq;
1851
1852abort:
1853        free(freq->url);
1854        free(freq);
1855        return NULL;
1856}
1857
1858void process_http_object_request(struct http_object_request *freq)
1859{
1860        if (freq->slot == NULL)
1861                return;
1862        freq->curl_result = freq->slot->curl_result;
1863        freq->http_code = freq->slot->http_code;
1864        freq->slot = NULL;
1865}
1866
1867int finish_http_object_request(struct http_object_request *freq)
1868{
1869        struct stat st;
1870
1871        close(freq->localfile);
1872        freq->localfile = -1;
1873
1874        process_http_object_request(freq);
1875
1876        if (freq->http_code == 416) {
1877                warning("requested range invalid; we may already have all the data.");
1878        } else if (freq->curl_result != CURLE_OK) {
1879                if (stat(freq->tmpfile, &st) == 0)
1880                        if (st.st_size == 0)
1881                                unlink_or_warn(freq->tmpfile);
1882                return -1;
1883        }
1884
1885        git_inflate_end(&freq->stream);
1886        git_SHA1_Final(freq->real_sha1, &freq->c);
1887        if (freq->zret != Z_STREAM_END) {
1888                unlink_or_warn(freq->tmpfile);
1889                return -1;
1890        }
1891        if (hashcmp(freq->sha1, freq->real_sha1)) {
1892                unlink_or_warn(freq->tmpfile);
1893                return -1;
1894        }
1895        freq->rename =
1896                finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1897
1898        return freq->rename;
1899}
1900
1901void abort_http_object_request(struct http_object_request *freq)
1902{
1903        unlink_or_warn(freq->tmpfile);
1904
1905        release_http_object_request(freq);
1906}
1907
1908void release_http_object_request(struct http_object_request *freq)
1909{
1910        if (freq->localfile != -1) {
1911                close(freq->localfile);
1912                freq->localfile = -1;
1913        }
1914        if (freq->url != NULL) {
1915                free(freq->url);
1916                freq->url = NULL;
1917        }
1918        if (freq->slot != NULL) {
1919                freq->slot->callback_func = NULL;
1920                freq->slot->callback_data = NULL;
1921                release_active_slot(freq->slot);
1922                freq->slot = NULL;
1923        }
1924}