Andrew's git / gitweb.git / http.c
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http.con commit submodule: ensure that -c http.extraheader is heeded (0bbe731)
   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
  14#if LIBCURL_VERSION_NUM >= 0x070a08
  15long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  16#else
  17long int git_curl_ipresolve;
  18#endif
  19int active_requests;
  20int http_is_verbose;
  21size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  22
  23#if LIBCURL_VERSION_NUM >= 0x070a06
  24#define LIBCURL_CAN_HANDLE_AUTH_ANY
  25#endif
  26
  27static int min_curl_sessions = 1;
  28static int curl_session_count;
  29#ifdef USE_CURL_MULTI
  30static int max_requests = -1;
  31static CURLM *curlm;
  32#endif
  33#ifndef NO_CURL_EASY_DUPHANDLE
  34static CURL *curl_default;
  35#endif
  36
  37#define PREV_BUF_SIZE 4096
  38
  39char curl_errorstr[CURL_ERROR_SIZE];
  40
  41static int curl_ssl_verify = -1;
  42static int curl_ssl_try;
  43static const char *ssl_cert;
  44static const char *ssl_cipherlist;
  45static const char *ssl_version;
  46static struct {
  47        const char *name;
  48        long ssl_version;
  49} sslversions[] = {
  50        { "sslv2", CURL_SSLVERSION_SSLv2 },
  51        { "sslv3", CURL_SSLVERSION_SSLv3 },
  52        { "tlsv1", CURL_SSLVERSION_TLSv1 },
  53#if LIBCURL_VERSION_NUM >= 0x072200
  54        { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  55        { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  56        { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  57#endif
  58};
  59#if LIBCURL_VERSION_NUM >= 0x070903
  60static const char *ssl_key;
  61#endif
  62#if LIBCURL_VERSION_NUM >= 0x070908
  63static const char *ssl_capath;
  64#endif
  65#if LIBCURL_VERSION_NUM >= 0x072c00
  66static const char *ssl_pinnedkey;
  67#endif
  68static const char *ssl_cainfo;
  69static long curl_low_speed_limit = -1;
  70static long curl_low_speed_time = -1;
  71static int curl_ftp_no_epsv;
  72static const char *curl_http_proxy;
  73static const char *curl_no_proxy;
  74static const char *http_proxy_authmethod;
  75static struct {
  76        const char *name;
  77        long curlauth_param;
  78} proxy_authmethods[] = {
  79        { "basic", CURLAUTH_BASIC },
  80        { "digest", CURLAUTH_DIGEST },
  81        { "negotiate", CURLAUTH_GSSNEGOTIATE },
  82        { "ntlm", CURLAUTH_NTLM },
  83#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  84        { "anyauth", CURLAUTH_ANY },
  85#endif
  86        /*
  87         * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  88         * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  89         * here, too
  90         */
  91};
  92static struct credential proxy_auth = CREDENTIAL_INIT;
  93static const char *curl_proxyuserpwd;
  94static const char *curl_cookie_file;
  95static int curl_save_cookies;
  96struct credential http_auth = CREDENTIAL_INIT;
  97static int http_proactive_auth;
  98static const char *user_agent;
  99static int curl_empty_auth;
 100
 101#if LIBCURL_VERSION_NUM >= 0x071700
 102/* Use CURLOPT_KEYPASSWD as is */
 103#elif LIBCURL_VERSION_NUM >= 0x070903
 104#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 105#else
 106#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 107#endif
 108
 109static struct credential cert_auth = CREDENTIAL_INIT;
 110static int ssl_cert_password_required;
 111#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 112static unsigned long http_auth_methods = CURLAUTH_ANY;
 113#endif
 114
 115static struct curl_slist *pragma_header;
 116static struct curl_slist *no_pragma_header;
 117static struct curl_slist *extra_http_headers;
 118
 119static struct active_request_slot *active_queue_head;
 120
 121static char *cached_accept_language;
 122
 123size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 124{
 125        size_t size = eltsize * nmemb;
 126        struct buffer *buffer = buffer_;
 127
 128        if (size > buffer->buf.len - buffer->posn)
 129                size = buffer->buf.len - buffer->posn;
 130        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 131        buffer->posn += size;
 132
 133        return size;
 134}
 135
 136#ifndef NO_CURL_IOCTL
 137curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 138{
 139        struct buffer *buffer = clientp;
 140
 141        switch (cmd) {
 142        case CURLIOCMD_NOP:
 143                return CURLIOE_OK;
 144
 145        case CURLIOCMD_RESTARTREAD:
 146                buffer->posn = 0;
 147                return CURLIOE_OK;
 148
 149        default:
 150                return CURLIOE_UNKNOWNCMD;
 151        }
 152}
 153#endif
 154
 155size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 156{
 157        size_t size = eltsize * nmemb;
 158        struct strbuf *buffer = buffer_;
 159
 160        strbuf_add(buffer, ptr, size);
 161        return size;
 162}
 163
 164size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 165{
 166        return eltsize * nmemb;
 167}
 168
 169static void closedown_active_slot(struct active_request_slot *slot)
 170{
 171        active_requests--;
 172        slot->in_use = 0;
 173}
 174
 175static void finish_active_slot(struct active_request_slot *slot)
 176{
 177        closedown_active_slot(slot);
 178        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 179
 180        if (slot->finished != NULL)
 181                (*slot->finished) = 1;
 182
 183        /* Store slot results so they can be read after the slot is reused */
 184        if (slot->results != NULL) {
 185                slot->results->curl_result = slot->curl_result;
 186                slot->results->http_code = slot->http_code;
 187#if LIBCURL_VERSION_NUM >= 0x070a08
 188                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 189                                  &slot->results->auth_avail);
 190#else
 191                slot->results->auth_avail = 0;
 192#endif
 193
 194                curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 195                        &slot->results->http_connectcode);
 196        }
 197
 198        /* Run callback if appropriate */
 199        if (slot->callback_func != NULL)
 200                slot->callback_func(slot->callback_data);
 201}
 202
 203#ifdef USE_CURL_MULTI
 204static void process_curl_messages(void)
 205{
 206        int num_messages;
 207        struct active_request_slot *slot;
 208        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 209
 210        while (curl_message != NULL) {
 211                if (curl_message->msg == CURLMSG_DONE) {
 212                        int curl_result = curl_message->data.result;
 213                        slot = active_queue_head;
 214                        while (slot != NULL &&
 215                               slot->curl != curl_message->easy_handle)
 216                                slot = slot->next;
 217                        if (slot != NULL) {
 218                                curl_multi_remove_handle(curlm, slot->curl);
 219                                slot->curl_result = curl_result;
 220                                finish_active_slot(slot);
 221                        } else {
 222                                fprintf(stderr, "Received DONE message for unknown request!\n");
 223                        }
 224                } else {
 225                        fprintf(stderr, "Unknown CURL message received: %d\n",
 226                                (int)curl_message->msg);
 227                }
 228                curl_message = curl_multi_info_read(curlm, &num_messages);
 229        }
 230}
 231#endif
 232
 233static int http_options(const char *var, const char *value, void *cb)
 234{
 235        if (!strcmp("http.sslverify", var)) {
 236                curl_ssl_verify = git_config_bool(var, value);
 237                return 0;
 238        }
 239        if (!strcmp("http.sslcipherlist", var))
 240                return git_config_string(&ssl_cipherlist, var, value);
 241        if (!strcmp("http.sslversion", var))
 242                return git_config_string(&ssl_version, var, value);
 243        if (!strcmp("http.sslcert", var))
 244                return git_config_string(&ssl_cert, var, value);
 245#if LIBCURL_VERSION_NUM >= 0x070903
 246        if (!strcmp("http.sslkey", var))
 247                return git_config_string(&ssl_key, var, value);
 248#endif
 249#if LIBCURL_VERSION_NUM >= 0x070908
 250        if (!strcmp("http.sslcapath", var))
 251                return git_config_pathname(&ssl_capath, var, value);
 252#endif
 253        if (!strcmp("http.sslcainfo", var))
 254                return git_config_pathname(&ssl_cainfo, var, value);
 255        if (!strcmp("http.sslcertpasswordprotected", var)) {
 256                ssl_cert_password_required = git_config_bool(var, value);
 257                return 0;
 258        }
 259        if (!strcmp("http.ssltry", var)) {
 260                curl_ssl_try = git_config_bool(var, value);
 261                return 0;
 262        }
 263        if (!strcmp("http.minsessions", var)) {
 264                min_curl_sessions = git_config_int(var, value);
 265#ifndef USE_CURL_MULTI
 266                if (min_curl_sessions > 1)
 267                        min_curl_sessions = 1;
 268#endif
 269                return 0;
 270        }
 271#ifdef USE_CURL_MULTI
 272        if (!strcmp("http.maxrequests", var)) {
 273                max_requests = git_config_int(var, value);
 274                return 0;
 275        }
 276#endif
 277        if (!strcmp("http.lowspeedlimit", var)) {
 278                curl_low_speed_limit = (long)git_config_int(var, value);
 279                return 0;
 280        }
 281        if (!strcmp("http.lowspeedtime", var)) {
 282                curl_low_speed_time = (long)git_config_int(var, value);
 283                return 0;
 284        }
 285
 286        if (!strcmp("http.noepsv", var)) {
 287                curl_ftp_no_epsv = git_config_bool(var, value);
 288                return 0;
 289        }
 290        if (!strcmp("http.proxy", var))
 291                return git_config_string(&curl_http_proxy, var, value);
 292
 293        if (!strcmp("http.proxyauthmethod", var))
 294                return git_config_string(&http_proxy_authmethod, var, value);
 295
 296        if (!strcmp("http.cookiefile", var))
 297                return git_config_string(&curl_cookie_file, var, value);
 298        if (!strcmp("http.savecookies", var)) {
 299                curl_save_cookies = git_config_bool(var, value);
 300                return 0;
 301        }
 302
 303        if (!strcmp("http.postbuffer", var)) {
 304                http_post_buffer = git_config_int(var, value);
 305                if (http_post_buffer < LARGE_PACKET_MAX)
 306                        http_post_buffer = LARGE_PACKET_MAX;
 307                return 0;
 308        }
 309
 310        if (!strcmp("http.useragent", var))
 311                return git_config_string(&user_agent, var, value);
 312
 313        if (!strcmp("http.emptyauth", var)) {
 314                curl_empty_auth = git_config_bool(var, value);
 315                return 0;
 316        }
 317
 318        if (!strcmp("http.pinnedpubkey", var)) {
 319#if LIBCURL_VERSION_NUM >= 0x072c00
 320                return git_config_pathname(&ssl_pinnedkey, var, value);
 321#else
 322                warning(_("Public key pinning not supported with cURL < 7.44.0"));
 323                return 0;
 324#endif
 325        }
 326
 327        if (!strcmp("http.extraheader", var)) {
 328                if (!value) {
 329                        return config_error_nonbool(var);
 330                } else if (!*value) {
 331                        curl_slist_free_all(extra_http_headers);
 332                        extra_http_headers = NULL;
 333                } else {
 334                        extra_http_headers =
 335                                curl_slist_append(extra_http_headers, value);
 336                }
 337                return 0;
 338        }
 339
 340        /* Fall back on the default ones */
 341        return git_default_config(var, value, cb);
 342}
 343
 344static void init_curl_http_auth(CURL *result)
 345{
 346        if (!http_auth.username) {
 347                if (curl_empty_auth)
 348                        curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 349                return;
 350        }
 351
 352        credential_fill(&http_auth);
 353
 354#if LIBCURL_VERSION_NUM >= 0x071301
 355        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 356        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 357#else
 358        {
 359                static struct strbuf up = STRBUF_INIT;
 360                /*
 361                 * Note that we assume we only ever have a single set of
 362                 * credentials in a given program run, so we do not have
 363                 * to worry about updating this buffer, only setting its
 364                 * initial value.
 365                 */
 366                if (!up.len)
 367                        strbuf_addf(&up, "%s:%s",
 368                                http_auth.username, http_auth.password);
 369                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 370        }
 371#endif
 372}
 373
 374/* *var must be free-able */
 375static void var_override(const char **var, char *value)
 376{
 377        if (value) {
 378                free((void *)*var);
 379                *var = xstrdup(value);
 380        }
 381}
 382
 383static void set_proxyauth_name_password(CURL *result)
 384{
 385#if LIBCURL_VERSION_NUM >= 0x071301
 386                curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 387                        proxy_auth.username);
 388                curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 389                        proxy_auth.password);
 390#else
 391                struct strbuf s = STRBUF_INIT;
 392
 393                strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 394                strbuf_addch(&s, ':');
 395                strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 396                curl_proxyuserpwd = strbuf_detach(&s, NULL);
 397                curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 398#endif
 399}
 400
 401static void init_curl_proxy_auth(CURL *result)
 402{
 403        if (proxy_auth.username) {
 404                if (!proxy_auth.password)
 405                        credential_fill(&proxy_auth);
 406                set_proxyauth_name_password(result);
 407        }
 408
 409        var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 410
 411#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 412        if (http_proxy_authmethod) {
 413                int i;
 414                for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 415                        if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 416                                curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 417                                                proxy_authmethods[i].curlauth_param);
 418                                break;
 419                        }
 420                }
 421                if (i == ARRAY_SIZE(proxy_authmethods)) {
 422                        warning("unsupported proxy authentication method %s: using anyauth",
 423                                        http_proxy_authmethod);
 424                        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 425                }
 426        }
 427        else
 428                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 429#endif
 430}
 431
 432static int has_cert_password(void)
 433{
 434        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 435                return 0;
 436        if (!cert_auth.password) {
 437                cert_auth.protocol = xstrdup("cert");
 438                cert_auth.username = xstrdup("");
 439                cert_auth.path = xstrdup(ssl_cert);
 440                credential_fill(&cert_auth);
 441        }
 442        return 1;
 443}
 444
 445#if LIBCURL_VERSION_NUM >= 0x071900
 446static void set_curl_keepalive(CURL *c)
 447{
 448        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 449}
 450
 451#elif LIBCURL_VERSION_NUM >= 0x071000
 452static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 453{
 454        int ka = 1;
 455        int rc;
 456        socklen_t len = (socklen_t)sizeof(ka);
 457
 458        if (type != CURLSOCKTYPE_IPCXN)
 459                return 0;
 460
 461        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 462        if (rc < 0)
 463                warning("unable to set SO_KEEPALIVE on socket %s",
 464                        strerror(errno));
 465
 466        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 467}
 468
 469static void set_curl_keepalive(CURL *c)
 470{
 471        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 472}
 473
 474#else
 475static void set_curl_keepalive(CURL *c)
 476{
 477        /* not supported on older curl versions */
 478}
 479#endif
 480
 481static CURL *get_curl_handle(void)
 482{
 483        CURL *result = curl_easy_init();
 484        long allowed_protocols = 0;
 485
 486        if (!result)
 487                die("curl_easy_init failed");
 488
 489        if (!curl_ssl_verify) {
 490                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 491                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 492        } else {
 493                /* Verify authenticity of the peer's certificate */
 494                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 495                /* The name in the cert must match whom we tried to connect */
 496                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 497        }
 498
 499#if LIBCURL_VERSION_NUM >= 0x070907
 500        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 501#endif
 502#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 503        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 504#endif
 505
 506        if (http_proactive_auth)
 507                init_curl_http_auth(result);
 508
 509        if (getenv("GIT_SSL_VERSION"))
 510                ssl_version = getenv("GIT_SSL_VERSION");
 511        if (ssl_version && *ssl_version) {
 512                int i;
 513                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 514                        if (!strcmp(ssl_version, sslversions[i].name)) {
 515                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 516                                                 sslversions[i].ssl_version);
 517                                break;
 518                        }
 519                }
 520                if (i == ARRAY_SIZE(sslversions))
 521                        warning("unsupported ssl version %s: using default",
 522                                ssl_version);
 523        }
 524
 525        if (getenv("GIT_SSL_CIPHER_LIST"))
 526                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 527        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 528                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 529                                ssl_cipherlist);
 530
 531        if (ssl_cert != NULL)
 532                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 533        if (has_cert_password())
 534                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 535#if LIBCURL_VERSION_NUM >= 0x070903
 536        if (ssl_key != NULL)
 537                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 538#endif
 539#if LIBCURL_VERSION_NUM >= 0x070908
 540        if (ssl_capath != NULL)
 541                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 542#endif
 543#if LIBCURL_VERSION_NUM >= 0x072c00
 544        if (ssl_pinnedkey != NULL)
 545                curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 546#endif
 547        if (ssl_cainfo != NULL)
 548                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 549
 550        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 551                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 552                                 curl_low_speed_limit);
 553                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 554                                 curl_low_speed_time);
 555        }
 556
 557        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 558        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 559#if LIBCURL_VERSION_NUM >= 0x071301
 560        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 561#elif LIBCURL_VERSION_NUM >= 0x071101
 562        curl_easy_setopt(result, CURLOPT_POST301, 1);
 563#endif
 564#if LIBCURL_VERSION_NUM >= 0x071304
 565        if (is_transport_allowed("http"))
 566                allowed_protocols |= CURLPROTO_HTTP;
 567        if (is_transport_allowed("https"))
 568                allowed_protocols |= CURLPROTO_HTTPS;
 569        if (is_transport_allowed("ftp"))
 570                allowed_protocols |= CURLPROTO_FTP;
 571        if (is_transport_allowed("ftps"))
 572                allowed_protocols |= CURLPROTO_FTPS;
 573        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 574#else
 575        if (transport_restrict_protocols())
 576                warning("protocol restrictions not applied to curl redirects because\n"
 577                        "your curl version is too old (>= 7.19.4)");
 578#endif
 579
 580        if (getenv("GIT_CURL_VERBOSE"))
 581                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 582
 583        curl_easy_setopt(result, CURLOPT_USERAGENT,
 584                user_agent ? user_agent : git_user_agent());
 585
 586        if (curl_ftp_no_epsv)
 587                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 588
 589#ifdef CURLOPT_USE_SSL
 590        if (curl_ssl_try)
 591                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 592#endif
 593
 594        /*
 595         * CURL also examines these variables as a fallback; but we need to query
 596         * them here in order to decide whether to prompt for missing password (cf.
 597         * init_curl_proxy_auth()).
 598         *
 599         * Unlike many other common environment variables, these are historically
 600         * lowercase only. It appears that CURL did not know this and implemented
 601         * only uppercase variants, which was later corrected to take both - with
 602         * the exception of http_proxy, which is lowercase only also in CURL. As
 603         * the lowercase versions are the historical quasi-standard, they take
 604         * precedence here, as in CURL.
 605         */
 606        if (!curl_http_proxy) {
 607                if (!strcmp(http_auth.protocol, "https")) {
 608                        var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 609                        var_override(&curl_http_proxy, getenv("https_proxy"));
 610                } else {
 611                        var_override(&curl_http_proxy, getenv("http_proxy"));
 612                }
 613                if (!curl_http_proxy) {
 614                        var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 615                        var_override(&curl_http_proxy, getenv("all_proxy"));
 616                }
 617        }
 618
 619        if (curl_http_proxy) {
 620                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 621#if LIBCURL_VERSION_NUM >= 0x071800
 622                if (starts_with(curl_http_proxy, "socks5"))
 623                        curl_easy_setopt(result,
 624                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 625                else if (starts_with(curl_http_proxy, "socks4a"))
 626                        curl_easy_setopt(result,
 627                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 628                else if (starts_with(curl_http_proxy, "socks"))
 629                        curl_easy_setopt(result,
 630                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 631#endif
 632                if (strstr(curl_http_proxy, "://"))
 633                        credential_from_url(&proxy_auth, curl_http_proxy);
 634                else {
 635                        struct strbuf url = STRBUF_INIT;
 636                        strbuf_addf(&url, "http://%s", curl_http_proxy);
 637                        credential_from_url(&proxy_auth, url.buf);
 638                        strbuf_release(&url);
 639                }
 640
 641                curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 642#if LIBCURL_VERSION_NUM >= 0x071304
 643                var_override(&curl_no_proxy, getenv("NO_PROXY"));
 644                var_override(&curl_no_proxy, getenv("no_proxy"));
 645                curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 646#endif
 647        }
 648        init_curl_proxy_auth(result);
 649
 650        set_curl_keepalive(result);
 651
 652        return result;
 653}
 654
 655static void set_from_env(const char **var, const char *envname)
 656{
 657        const char *val = getenv(envname);
 658        if (val)
 659                *var = val;
 660}
 661
 662void http_init(struct remote *remote, const char *url, int proactive_auth)
 663{
 664        char *low_speed_limit;
 665        char *low_speed_time;
 666        char *normalized_url;
 667        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 668
 669        config.section = "http";
 670        config.key = NULL;
 671        config.collect_fn = http_options;
 672        config.cascade_fn = git_default_config;
 673        config.cb = NULL;
 674
 675        http_is_verbose = 0;
 676        normalized_url = url_normalize(url, &config.url);
 677
 678        git_config(urlmatch_config_entry, &config);
 679        free(normalized_url);
 680
 681        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 682                die("curl_global_init failed");
 683
 684        http_proactive_auth = proactive_auth;
 685
 686        if (remote && remote->http_proxy)
 687                curl_http_proxy = xstrdup(remote->http_proxy);
 688
 689        if (remote)
 690                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 691
 692        pragma_header = curl_slist_append(http_copy_default_headers(),
 693                "Pragma: no-cache");
 694        no_pragma_header = curl_slist_append(http_copy_default_headers(),
 695                "Pragma:");
 696
 697#ifdef USE_CURL_MULTI
 698        {
 699                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 700                if (http_max_requests != NULL)
 701                        max_requests = atoi(http_max_requests);
 702        }
 703
 704        curlm = curl_multi_init();
 705        if (!curlm)
 706                die("curl_multi_init failed");
 707#endif
 708
 709        if (getenv("GIT_SSL_NO_VERIFY"))
 710                curl_ssl_verify = 0;
 711
 712        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 713#if LIBCURL_VERSION_NUM >= 0x070903
 714        set_from_env(&ssl_key, "GIT_SSL_KEY");
 715#endif
 716#if LIBCURL_VERSION_NUM >= 0x070908
 717        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 718#endif
 719        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 720
 721        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 722
 723        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 724        if (low_speed_limit != NULL)
 725                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 726        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 727        if (low_speed_time != NULL)
 728                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 729
 730        if (curl_ssl_verify == -1)
 731                curl_ssl_verify = 1;
 732
 733        curl_session_count = 0;
 734#ifdef USE_CURL_MULTI
 735        if (max_requests < 1)
 736                max_requests = DEFAULT_MAX_REQUESTS;
 737#endif
 738
 739        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 740                curl_ftp_no_epsv = 1;
 741
 742        if (url) {
 743                credential_from_url(&http_auth, url);
 744                if (!ssl_cert_password_required &&
 745                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 746                    starts_with(url, "https://"))
 747                        ssl_cert_password_required = 1;
 748        }
 749
 750#ifndef NO_CURL_EASY_DUPHANDLE
 751        curl_default = get_curl_handle();
 752#endif
 753}
 754
 755void http_cleanup(void)
 756{
 757        struct active_request_slot *slot = active_queue_head;
 758
 759        while (slot != NULL) {
 760                struct active_request_slot *next = slot->next;
 761                if (slot->curl != NULL) {
 762#ifdef USE_CURL_MULTI
 763                        curl_multi_remove_handle(curlm, slot->curl);
 764#endif
 765                        curl_easy_cleanup(slot->curl);
 766                }
 767                free(slot);
 768                slot = next;
 769        }
 770        active_queue_head = NULL;
 771
 772#ifndef NO_CURL_EASY_DUPHANDLE
 773        curl_easy_cleanup(curl_default);
 774#endif
 775
 776#ifdef USE_CURL_MULTI
 777        curl_multi_cleanup(curlm);
 778#endif
 779        curl_global_cleanup();
 780
 781        curl_slist_free_all(extra_http_headers);
 782        extra_http_headers = NULL;
 783
 784        curl_slist_free_all(pragma_header);
 785        pragma_header = NULL;
 786
 787        curl_slist_free_all(no_pragma_header);
 788        no_pragma_header = NULL;
 789
 790        if (curl_http_proxy) {
 791                free((void *)curl_http_proxy);
 792                curl_http_proxy = NULL;
 793        }
 794
 795        if (proxy_auth.password) {
 796                memset(proxy_auth.password, 0, strlen(proxy_auth.password));
 797                free(proxy_auth.password);
 798                proxy_auth.password = NULL;
 799        }
 800
 801        free((void *)curl_proxyuserpwd);
 802        curl_proxyuserpwd = NULL;
 803
 804        free((void *)http_proxy_authmethod);
 805        http_proxy_authmethod = NULL;
 806
 807        if (cert_auth.password != NULL) {
 808                memset(cert_auth.password, 0, strlen(cert_auth.password));
 809                free(cert_auth.password);
 810                cert_auth.password = NULL;
 811        }
 812        ssl_cert_password_required = 0;
 813
 814        free(cached_accept_language);
 815        cached_accept_language = NULL;
 816}
 817
 818struct active_request_slot *get_active_slot(void)
 819{
 820        struct active_request_slot *slot = active_queue_head;
 821        struct active_request_slot *newslot;
 822
 823#ifdef USE_CURL_MULTI
 824        int num_transfers;
 825
 826        /* Wait for a slot to open up if the queue is full */
 827        while (active_requests >= max_requests) {
 828                curl_multi_perform(curlm, &num_transfers);
 829                if (num_transfers < active_requests)
 830                        process_curl_messages();
 831        }
 832#endif
 833
 834        while (slot != NULL && slot->in_use)
 835                slot = slot->next;
 836
 837        if (slot == NULL) {
 838                newslot = xmalloc(sizeof(*newslot));
 839                newslot->curl = NULL;
 840                newslot->in_use = 0;
 841                newslot->next = NULL;
 842
 843                slot = active_queue_head;
 844                if (slot == NULL) {
 845                        active_queue_head = newslot;
 846                } else {
 847                        while (slot->next != NULL)
 848                                slot = slot->next;
 849                        slot->next = newslot;
 850                }
 851                slot = newslot;
 852        }
 853
 854        if (slot->curl == NULL) {
 855#ifdef NO_CURL_EASY_DUPHANDLE
 856                slot->curl = get_curl_handle();
 857#else
 858                slot->curl = curl_easy_duphandle(curl_default);
 859#endif
 860                curl_session_count++;
 861        }
 862
 863        active_requests++;
 864        slot->in_use = 1;
 865        slot->results = NULL;
 866        slot->finished = NULL;
 867        slot->callback_data = NULL;
 868        slot->callback_func = NULL;
 869        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 870        if (curl_save_cookies)
 871                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 872        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 873        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 874        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 875        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 876        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 877        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 878        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 879        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 880        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 881        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
 882
 883#if LIBCURL_VERSION_NUM >= 0x070a08
 884        curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
 885#endif
 886#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 887        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 888#endif
 889        if (http_auth.password || curl_empty_auth)
 890                init_curl_http_auth(slot->curl);
 891
 892        return slot;
 893}
 894
 895int start_active_slot(struct active_request_slot *slot)
 896{
 897#ifdef USE_CURL_MULTI
 898        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 899        int num_transfers;
 900
 901        if (curlm_result != CURLM_OK &&
 902            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 903                active_requests--;
 904                slot->in_use = 0;
 905                return 0;
 906        }
 907
 908        /*
 909         * We know there must be something to do, since we just added
 910         * something.
 911         */
 912        curl_multi_perform(curlm, &num_transfers);
 913#endif
 914        return 1;
 915}
 916
 917#ifdef USE_CURL_MULTI
 918struct fill_chain {
 919        void *data;
 920        int (*fill)(void *);
 921        struct fill_chain *next;
 922};
 923
 924static struct fill_chain *fill_cfg;
 925
 926void add_fill_function(void *data, int (*fill)(void *))
 927{
 928        struct fill_chain *new = xmalloc(sizeof(*new));
 929        struct fill_chain **linkp = &fill_cfg;
 930        new->data = data;
 931        new->fill = fill;
 932        new->next = NULL;
 933        while (*linkp)
 934                linkp = &(*linkp)->next;
 935        *linkp = new;
 936}
 937
 938void fill_active_slots(void)
 939{
 940        struct active_request_slot *slot = active_queue_head;
 941
 942        while (active_requests < max_requests) {
 943                struct fill_chain *fill;
 944                for (fill = fill_cfg; fill; fill = fill->next)
 945                        if (fill->fill(fill->data))
 946                                break;
 947
 948                if (!fill)
 949                        break;
 950        }
 951
 952        while (slot != NULL) {
 953                if (!slot->in_use && slot->curl != NULL
 954                        && curl_session_count > min_curl_sessions) {
 955                        curl_easy_cleanup(slot->curl);
 956                        slot->curl = NULL;
 957                        curl_session_count--;
 958                }
 959                slot = slot->next;
 960        }
 961}
 962
 963void step_active_slots(void)
 964{
 965        int num_transfers;
 966        CURLMcode curlm_result;
 967
 968        do {
 969                curlm_result = curl_multi_perform(curlm, &num_transfers);
 970        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 971        if (num_transfers < active_requests) {
 972                process_curl_messages();
 973                fill_active_slots();
 974        }
 975}
 976#endif
 977
 978void run_active_slot(struct active_request_slot *slot)
 979{
 980#ifdef USE_CURL_MULTI
 981        fd_set readfds;
 982        fd_set writefds;
 983        fd_set excfds;
 984        int max_fd;
 985        struct timeval select_timeout;
 986        int finished = 0;
 987
 988        slot->finished = &finished;
 989        while (!finished) {
 990                step_active_slots();
 991
 992                if (slot->in_use) {
 993#if LIBCURL_VERSION_NUM >= 0x070f04
 994                        long curl_timeout;
 995                        curl_multi_timeout(curlm, &curl_timeout);
 996                        if (curl_timeout == 0) {
 997                                continue;
 998                        } else if (curl_timeout == -1) {
 999                                select_timeout.tv_sec  = 0;
1000                                select_timeout.tv_usec = 50000;
1001                        } else {
1002                                select_timeout.tv_sec  =  curl_timeout / 1000;
1003                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1004                        }
1005#else
1006                        select_timeout.tv_sec  = 0;
1007                        select_timeout.tv_usec = 50000;
1008#endif
1009
1010                        max_fd = -1;
1011                        FD_ZERO(&readfds);
1012                        FD_ZERO(&writefds);
1013                        FD_ZERO(&excfds);
1014                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1015
1016                        /*
1017                         * It can happen that curl_multi_timeout returns a pathologically
1018                         * long timeout when curl_multi_fdset returns no file descriptors
1019                         * to read.  See commit message for more details.
1020                         */
1021                        if (max_fd < 0 &&
1022                            (select_timeout.tv_sec > 0 ||
1023                             select_timeout.tv_usec > 50000)) {
1024                                select_timeout.tv_sec  = 0;
1025                                select_timeout.tv_usec = 50000;
1026                        }
1027
1028                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1029                }
1030        }
1031#else
1032        while (slot->in_use) {
1033                slot->curl_result = curl_easy_perform(slot->curl);
1034                finish_active_slot(slot);
1035        }
1036#endif
1037}
1038
1039static void release_active_slot(struct active_request_slot *slot)
1040{
1041        closedown_active_slot(slot);
1042        if (slot->curl && curl_session_count > min_curl_sessions) {
1043#ifdef USE_CURL_MULTI
1044                curl_multi_remove_handle(curlm, slot->curl);
1045#endif
1046                curl_easy_cleanup(slot->curl);
1047                slot->curl = NULL;
1048                curl_session_count--;
1049        }
1050#ifdef USE_CURL_MULTI
1051        fill_active_slots();
1052#endif
1053}
1054
1055void finish_all_active_slots(void)
1056{
1057        struct active_request_slot *slot = active_queue_head;
1058
1059        while (slot != NULL)
1060                if (slot->in_use) {
1061                        run_active_slot(slot);
1062                        slot = active_queue_head;
1063                } else {
1064                        slot = slot->next;
1065                }
1066}
1067
1068/* Helpers for modifying and creating URLs */
1069static inline int needs_quote(int ch)
1070{
1071        if (((ch >= 'A') && (ch <= 'Z'))
1072                        || ((ch >= 'a') && (ch <= 'z'))
1073                        || ((ch >= '0') && (ch <= '9'))
1074                        || (ch == '/')
1075                        || (ch == '-')
1076                        || (ch == '.'))
1077                return 0;
1078        return 1;
1079}
1080
1081static char *quote_ref_url(const char *base, const char *ref)
1082{
1083        struct strbuf buf = STRBUF_INIT;
1084        const char *cp;
1085        int ch;
1086
1087        end_url_with_slash(&buf, base);
1088
1089        for (cp = ref; (ch = *cp) != 0; cp++)
1090                if (needs_quote(ch))
1091                        strbuf_addf(&buf, "%%%02x", ch);
1092                else
1093                        strbuf_addch(&buf, *cp);
1094
1095        return strbuf_detach(&buf, NULL);
1096}
1097
1098void append_remote_object_url(struct strbuf *buf, const char *url,
1099                              const char *hex,
1100                              int only_two_digit_prefix)
1101{
1102        end_url_with_slash(buf, url);
1103
1104        strbuf_addf(buf, "objects/%.*s/", 2, hex);
1105        if (!only_two_digit_prefix)
1106                strbuf_addf(buf, "%s", hex+2);
1107}
1108
1109char *get_remote_object_url(const char *url, const char *hex,
1110                            int only_two_digit_prefix)
1111{
1112        struct strbuf buf = STRBUF_INIT;
1113        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1114        return strbuf_detach(&buf, NULL);
1115}
1116
1117static int handle_curl_result(struct slot_results *results)
1118{
1119        /*
1120         * If we see a failing http code with CURLE_OK, we have turned off
1121         * FAILONERROR (to keep the server's custom error response), and should
1122         * translate the code into failure here.
1123         */
1124        if (results->curl_result == CURLE_OK &&
1125            results->http_code >= 400) {
1126                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1127                /*
1128                 * Normally curl will already have put the "reason phrase"
1129                 * from the server into curl_errorstr; unfortunately without
1130                 * FAILONERROR it is lost, so we can give only the numeric
1131                 * status code.
1132                 */
1133                snprintf(curl_errorstr, sizeof(curl_errorstr),
1134                         "The requested URL returned error: %ld",
1135                         results->http_code);
1136        }
1137
1138        if (results->curl_result == CURLE_OK) {
1139                credential_approve(&http_auth);
1140                if (proxy_auth.password)
1141                        credential_approve(&proxy_auth);
1142                return HTTP_OK;
1143        } else if (missing_target(results))
1144                return HTTP_MISSING_TARGET;
1145        else if (results->http_code == 401) {
1146                if (http_auth.username && http_auth.password) {
1147                        credential_reject(&http_auth);
1148                        return HTTP_NOAUTH;
1149                } else {
1150#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1151                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1152#endif
1153                        return HTTP_REAUTH;
1154                }
1155        } else {
1156                if (results->http_connectcode == 407)
1157                        credential_reject(&proxy_auth);
1158#if LIBCURL_VERSION_NUM >= 0x070c00
1159                if (!curl_errorstr[0])
1160                        strlcpy(curl_errorstr,
1161                                curl_easy_strerror(results->curl_result),
1162                                sizeof(curl_errorstr));
1163#endif
1164                return HTTP_ERROR;
1165        }
1166}
1167
1168int run_one_slot(struct active_request_slot *slot,
1169                 struct slot_results *results)
1170{
1171        slot->results = results;
1172        if (!start_active_slot(slot)) {
1173                snprintf(curl_errorstr, sizeof(curl_errorstr),
1174                         "failed to start HTTP request");
1175                return HTTP_START_FAILED;
1176        }
1177
1178        run_active_slot(slot);
1179        return handle_curl_result(results);
1180}
1181
1182struct curl_slist *http_copy_default_headers(void)
1183{
1184        struct curl_slist *headers = NULL, *h;
1185
1186        for (h = extra_http_headers; h; h = h->next)
1187                headers = curl_slist_append(headers, h->data);
1188
1189        return headers;
1190}
1191
1192static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1193{
1194        char *ptr;
1195        CURLcode ret;
1196
1197        strbuf_reset(buf);
1198        ret = curl_easy_getinfo(curl, info, &ptr);
1199        if (!ret && ptr)
1200                strbuf_addstr(buf, ptr);
1201        return ret;
1202}
1203
1204/*
1205 * Check for and extract a content-type parameter. "raw"
1206 * should be positioned at the start of the potential
1207 * parameter, with any whitespace already removed.
1208 *
1209 * "name" is the name of the parameter. The value is appended
1210 * to "out".
1211 */
1212static int extract_param(const char *raw, const char *name,
1213                         struct strbuf *out)
1214{
1215        size_t len = strlen(name);
1216
1217        if (strncasecmp(raw, name, len))
1218                return -1;
1219        raw += len;
1220
1221        if (*raw != '=')
1222                return -1;
1223        raw++;
1224
1225        while (*raw && !isspace(*raw) && *raw != ';')
1226                strbuf_addch(out, *raw++);
1227        return 0;
1228}
1229
1230/*
1231 * Extract a normalized version of the content type, with any
1232 * spaces suppressed, all letters lowercased, and no trailing ";"
1233 * or parameters.
1234 *
1235 * Note that we will silently remove even invalid whitespace. For
1236 * example, "text / plain" is specifically forbidden by RFC 2616,
1237 * but "text/plain" is the only reasonable output, and this keeps
1238 * our code simple.
1239 *
1240 * If the "charset" argument is not NULL, store the value of any
1241 * charset parameter there.
1242 *
1243 * Example:
1244 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1245 *   "text / plain" -> "text/plain"
1246 */
1247static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1248                                 struct strbuf *charset)
1249{
1250        const char *p;
1251
1252        strbuf_reset(type);
1253        strbuf_grow(type, raw->len);
1254        for (p = raw->buf; *p; p++) {
1255                if (isspace(*p))
1256                        continue;
1257                if (*p == ';') {
1258                        p++;
1259                        break;
1260                }
1261                strbuf_addch(type, tolower(*p));
1262        }
1263
1264        if (!charset)
1265                return;
1266
1267        strbuf_reset(charset);
1268        while (*p) {
1269                while (isspace(*p) || *p == ';')
1270                        p++;
1271                if (!extract_param(p, "charset", charset))
1272                        return;
1273                while (*p && !isspace(*p))
1274                        p++;
1275        }
1276
1277        if (!charset->len && starts_with(type->buf, "text/"))
1278                strbuf_addstr(charset, "ISO-8859-1");
1279}
1280
1281static void write_accept_language(struct strbuf *buf)
1282{
1283        /*
1284         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1285         * that, q-value will be smaller than 0.001, the minimum q-value the
1286         * HTTP specification allows. See
1287         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1288         */
1289        const int MAX_DECIMAL_PLACES = 3;
1290        const int MAX_LANGUAGE_TAGS = 1000;
1291        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1292        char **language_tags = NULL;
1293        int num_langs = 0;
1294        const char *s = get_preferred_languages();
1295        int i;
1296        struct strbuf tag = STRBUF_INIT;
1297
1298        /* Don't add Accept-Language header if no language is preferred. */
1299        if (!s)
1300                return;
1301
1302        /*
1303         * Split the colon-separated string of preferred languages into
1304         * language_tags array.
1305         */
1306        do {
1307                /* collect language tag */
1308                for (; *s && (isalnum(*s) || *s == '_'); s++)
1309                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1310
1311                /* skip .codeset, @modifier and any other unnecessary parts */
1312                while (*s && *s != ':')
1313                        s++;
1314
1315                if (tag.len) {
1316                        num_langs++;
1317                        REALLOC_ARRAY(language_tags, num_langs);
1318                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1319                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1320                                break;
1321                }
1322        } while (*s++);
1323
1324        /* write Accept-Language header into buf */
1325        if (num_langs) {
1326                int last_buf_len = 0;
1327                int max_q;
1328                int decimal_places;
1329                char q_format[32];
1330
1331                /* add '*' */
1332                REALLOC_ARRAY(language_tags, num_langs + 1);
1333                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1334
1335                /* compute decimal_places */
1336                for (max_q = 1, decimal_places = 0;
1337                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1338                     decimal_places++, max_q *= 10)
1339                        ;
1340
1341                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1342
1343                strbuf_addstr(buf, "Accept-Language: ");
1344
1345                for (i = 0; i < num_langs; i++) {
1346                        if (i > 0)
1347                                strbuf_addstr(buf, ", ");
1348
1349                        strbuf_addstr(buf, language_tags[i]);
1350
1351                        if (i > 0)
1352                                strbuf_addf(buf, q_format, max_q - i);
1353
1354                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1355                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1356                                break;
1357                        }
1358
1359                        last_buf_len = buf->len;
1360                }
1361        }
1362
1363        /* free language tags -- last one is a static '*' */
1364        for (i = 0; i < num_langs - 1; i++)
1365                free(language_tags[i]);
1366        free(language_tags);
1367}
1368
1369/*
1370 * Get an Accept-Language header which indicates user's preferred languages.
1371 *
1372 * Examples:
1373 *   LANGUAGE= -> ""
1374 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1375 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1376 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1377 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1378 *   LANGUAGE= LANG=C -> ""
1379 */
1380static const char *get_accept_language(void)
1381{
1382        if (!cached_accept_language) {
1383                struct strbuf buf = STRBUF_INIT;
1384                write_accept_language(&buf);
1385                if (buf.len > 0)
1386                        cached_accept_language = strbuf_detach(&buf, NULL);
1387        }
1388
1389        return cached_accept_language;
1390}
1391
1392static void http_opt_request_remainder(CURL *curl, off_t pos)
1393{
1394        char buf[128];
1395        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1396        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1397}
1398
1399/* http_request() targets */
1400#define HTTP_REQUEST_STRBUF     0
1401#define HTTP_REQUEST_FILE       1
1402
1403static int http_request(const char *url,
1404                        void *result, int target,
1405                        const struct http_get_options *options)
1406{
1407        struct active_request_slot *slot;
1408        struct slot_results results;
1409        struct curl_slist *headers = http_copy_default_headers();
1410        struct strbuf buf = STRBUF_INIT;
1411        const char *accept_language;
1412        int ret;
1413
1414        slot = get_active_slot();
1415        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1416
1417        if (result == NULL) {
1418                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1419        } else {
1420                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1421                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1422
1423                if (target == HTTP_REQUEST_FILE) {
1424                        off_t posn = ftello(result);
1425                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1426                                         fwrite);
1427                        if (posn > 0)
1428                                http_opt_request_remainder(slot->curl, posn);
1429                } else
1430                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1431                                         fwrite_buffer);
1432        }
1433
1434        accept_language = get_accept_language();
1435
1436        if (accept_language)
1437                headers = curl_slist_append(headers, accept_language);
1438
1439        strbuf_addstr(&buf, "Pragma:");
1440        if (options && options->no_cache)
1441                strbuf_addstr(&buf, " no-cache");
1442        if (options && options->keep_error)
1443                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1444
1445        headers = curl_slist_append(headers, buf.buf);
1446
1447        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1448        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1449        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1450
1451        ret = run_one_slot(slot, &results);
1452
1453        if (options && options->content_type) {
1454                struct strbuf raw = STRBUF_INIT;
1455                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1456                extract_content_type(&raw, options->content_type,
1457                                     options->charset);
1458                strbuf_release(&raw);
1459        }
1460
1461        if (options && options->effective_url)
1462                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1463                                options->effective_url);
1464
1465        curl_slist_free_all(headers);
1466        strbuf_release(&buf);
1467
1468        return ret;
1469}
1470
1471/*
1472 * Update the "base" url to a more appropriate value, as deduced by
1473 * redirects seen when requesting a URL starting with "url".
1474 *
1475 * The "asked" parameter is a URL that we asked curl to access, and must begin
1476 * with "base".
1477 *
1478 * The "got" parameter is the URL that curl reported to us as where we ended
1479 * up.
1480 *
1481 * Returns 1 if we updated the base url, 0 otherwise.
1482 *
1483 * Our basic strategy is to compare "base" and "asked" to find the bits
1484 * specific to our request. We then strip those bits off of "got" to yield the
1485 * new base. So for example, if our base is "http://example.com/foo.git",
1486 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1487 * with "https://other.example.com/foo.git/info/refs". We would want the
1488 * new URL to become "https://other.example.com/foo.git".
1489 *
1490 * Note that this assumes a sane redirect scheme. It's entirely possible
1491 * in the example above to end up at a URL that does not even end in
1492 * "info/refs".  In such a case we simply punt, as there is not much we can
1493 * do (and such a scheme is unlikely to represent a real git repository,
1494 * which means we are likely about to abort anyway).
1495 */
1496static int update_url_from_redirect(struct strbuf *base,
1497                                    const char *asked,
1498                                    const struct strbuf *got)
1499{
1500        const char *tail;
1501        size_t tail_len;
1502
1503        if (!strcmp(asked, got->buf))
1504                return 0;
1505
1506        if (!skip_prefix(asked, base->buf, &tail))
1507                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1508                    asked, base->buf);
1509
1510        tail_len = strlen(tail);
1511
1512        if (got->len < tail_len ||
1513            strcmp(tail, got->buf + got->len - tail_len))
1514                return 0; /* insane redirect scheme */
1515
1516        strbuf_reset(base);
1517        strbuf_add(base, got->buf, got->len - tail_len);
1518        return 1;
1519}
1520
1521static int http_request_reauth(const char *url,
1522                               void *result, int target,
1523                               struct http_get_options *options)
1524{
1525        int ret = http_request(url, result, target, options);
1526
1527        if (options && options->effective_url && options->base_url) {
1528                if (update_url_from_redirect(options->base_url,
1529                                             url, options->effective_url)) {
1530                        credential_from_url(&http_auth, options->base_url->buf);
1531                        url = options->effective_url->buf;
1532                }
1533        }
1534
1535        if (ret != HTTP_REAUTH)
1536                return ret;
1537
1538        /*
1539         * If we are using KEEP_ERROR, the previous request may have
1540         * put cruft into our output stream; we should clear it out before
1541         * making our next request. We only know how to do this for
1542         * the strbuf case, but that is enough to satisfy current callers.
1543         */
1544        if (options && options->keep_error) {
1545                switch (target) {
1546                case HTTP_REQUEST_STRBUF:
1547                        strbuf_reset(result);
1548                        break;
1549                default:
1550                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1551                }
1552        }
1553
1554        credential_fill(&http_auth);
1555
1556        return http_request(url, result, target, options);
1557}
1558
1559int http_get_strbuf(const char *url,
1560                    struct strbuf *result,
1561                    struct http_get_options *options)
1562{
1563        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1564}
1565
1566/*
1567 * Downloads a URL and stores the result in the given file.
1568 *
1569 * If a previous interrupted download is detected (i.e. a previous temporary
1570 * file is still around) the download is resumed.
1571 */
1572static int http_get_file(const char *url, const char *filename,
1573                         struct http_get_options *options)
1574{
1575        int ret;
1576        struct strbuf tmpfile = STRBUF_INIT;
1577        FILE *result;
1578
1579        strbuf_addf(&tmpfile, "%s.temp", filename);
1580        result = fopen(tmpfile.buf, "a");
1581        if (!result) {
1582                error("Unable to open local file %s", tmpfile.buf);
1583                ret = HTTP_ERROR;
1584                goto cleanup;
1585        }
1586
1587        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1588        fclose(result);
1589
1590        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1591                ret = HTTP_ERROR;
1592cleanup:
1593        strbuf_release(&tmpfile);
1594        return ret;
1595}
1596
1597int http_fetch_ref(const char *base, struct ref *ref)
1598{
1599        struct http_get_options options = {0};
1600        char *url;
1601        struct strbuf buffer = STRBUF_INIT;
1602        int ret = -1;
1603
1604        options.no_cache = 1;
1605
1606        url = quote_ref_url(base, ref->name);
1607        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1608                strbuf_rtrim(&buffer);
1609                if (buffer.len == 40)
1610                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
1611                else if (starts_with(buffer.buf, "ref: ")) {
1612                        ref->symref = xstrdup(buffer.buf + 5);
1613                        ret = 0;
1614                }
1615        }
1616
1617        strbuf_release(&buffer);
1618        free(url);
1619        return ret;
1620}
1621
1622/* Helpers for fetching packs */
1623static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1624{
1625        char *url, *tmp;
1626        struct strbuf buf = STRBUF_INIT;
1627
1628        if (http_is_verbose)
1629                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1630
1631        end_url_with_slash(&buf, base_url);
1632        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1633        url = strbuf_detach(&buf, NULL);
1634
1635        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1636        tmp = strbuf_detach(&buf, NULL);
1637
1638        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1639                error("Unable to get pack index %s", url);
1640                free(tmp);
1641                tmp = NULL;
1642        }
1643
1644        free(url);
1645        return tmp;
1646}
1647
1648static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1649        unsigned char *sha1, const char *base_url)
1650{
1651        struct packed_git *new_pack;
1652        char *tmp_idx = NULL;
1653        int ret;
1654
1655        if (has_pack_index(sha1)) {
1656                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1657                if (!new_pack)
1658                        return -1; /* parse_pack_index() already issued error message */
1659                goto add_pack;
1660        }
1661
1662        tmp_idx = fetch_pack_index(sha1, base_url);
1663        if (!tmp_idx)
1664                return -1;
1665
1666        new_pack = parse_pack_index(sha1, tmp_idx);
1667        if (!new_pack) {
1668                unlink(tmp_idx);
1669                free(tmp_idx);
1670
1671                return -1; /* parse_pack_index() already issued error message */
1672        }
1673
1674        ret = verify_pack_index(new_pack);
1675        if (!ret) {
1676                close_pack_index(new_pack);
1677                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1678        }
1679        free(tmp_idx);
1680        if (ret)
1681                return -1;
1682
1683add_pack:
1684        new_pack->next = *packs_head;
1685        *packs_head = new_pack;
1686        return 0;
1687}
1688
1689int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1690{
1691        struct http_get_options options = {0};
1692        int ret = 0, i = 0;
1693        char *url, *data;
1694        struct strbuf buf = STRBUF_INIT;
1695        unsigned char sha1[20];
1696
1697        end_url_with_slash(&buf, base_url);
1698        strbuf_addstr(&buf, "objects/info/packs");
1699        url = strbuf_detach(&buf, NULL);
1700
1701        options.no_cache = 1;
1702        ret = http_get_strbuf(url, &buf, &options);
1703        if (ret != HTTP_OK)
1704                goto cleanup;
1705
1706        data = buf.buf;
1707        while (i < buf.len) {
1708                switch (data[i]) {
1709                case 'P':
1710                        i++;
1711                        if (i + 52 <= buf.len &&
1712                            starts_with(data + i, " pack-") &&
1713                            starts_with(data + i + 46, ".pack\n")) {
1714                                get_sha1_hex(data + i + 6, sha1);
1715                                fetch_and_setup_pack_index(packs_head, sha1,
1716                                                      base_url);
1717                                i += 51;
1718                                break;
1719                        }
1720                default:
1721                        while (i < buf.len && data[i] != '\n')
1722                                i++;
1723                }
1724                i++;
1725        }
1726
1727cleanup:
1728        free(url);
1729        return ret;
1730}
1731
1732void release_http_pack_request(struct http_pack_request *preq)
1733{
1734        if (preq->packfile != NULL) {
1735                fclose(preq->packfile);
1736                preq->packfile = NULL;
1737        }
1738        preq->slot = NULL;
1739        free(preq->url);
1740        free(preq);
1741}
1742
1743int finish_http_pack_request(struct http_pack_request *preq)
1744{
1745        struct packed_git **lst;
1746        struct packed_git *p = preq->target;
1747        char *tmp_idx;
1748        size_t len;
1749        struct child_process ip = CHILD_PROCESS_INIT;
1750        const char *ip_argv[8];
1751
1752        close_pack_index(p);
1753
1754        fclose(preq->packfile);
1755        preq->packfile = NULL;
1756
1757        lst = preq->lst;
1758        while (*lst != p)
1759                lst = &((*lst)->next);
1760        *lst = (*lst)->next;
1761
1762        if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1763                die("BUG: pack tmpfile does not end in .pack.temp?");
1764        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1765
1766        ip_argv[0] = "index-pack";
1767        ip_argv[1] = "-o";
1768        ip_argv[2] = tmp_idx;
1769        ip_argv[3] = preq->tmpfile;
1770        ip_argv[4] = NULL;
1771
1772        ip.argv = ip_argv;
1773        ip.git_cmd = 1;
1774        ip.no_stdin = 1;
1775        ip.no_stdout = 1;
1776
1777        if (run_command(&ip)) {
1778                unlink(preq->tmpfile);
1779                unlink(tmp_idx);
1780                free(tmp_idx);
1781                return -1;
1782        }
1783
1784        unlink(sha1_pack_index_name(p->sha1));
1785
1786        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1787         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1788                free(tmp_idx);
1789                return -1;
1790        }
1791
1792        install_packed_git(p);
1793        free(tmp_idx);
1794        return 0;
1795}
1796
1797struct http_pack_request *new_http_pack_request(
1798        struct packed_git *target, const char *base_url)
1799{
1800        off_t prev_posn = 0;
1801        struct strbuf buf = STRBUF_INIT;
1802        struct http_pack_request *preq;
1803
1804        preq = xcalloc(1, sizeof(*preq));
1805        preq->target = target;
1806
1807        end_url_with_slash(&buf, base_url);
1808        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1809                sha1_to_hex(target->sha1));
1810        preq->url = strbuf_detach(&buf, NULL);
1811
1812        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1813                sha1_pack_name(target->sha1));
1814        preq->packfile = fopen(preq->tmpfile, "a");
1815        if (!preq->packfile) {
1816                error("Unable to open local file %s for pack",
1817                      preq->tmpfile);
1818                goto abort;
1819        }
1820
1821        preq->slot = get_active_slot();
1822        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1823        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1824        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1825        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1826                no_pragma_header);
1827
1828        /*
1829         * If there is data present from a previous transfer attempt,
1830         * resume where it left off
1831         */
1832        prev_posn = ftello(preq->packfile);
1833        if (prev_posn>0) {
1834                if (http_is_verbose)
1835                        fprintf(stderr,
1836                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1837                                sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1838                http_opt_request_remainder(preq->slot->curl, prev_posn);
1839        }
1840
1841        return preq;
1842
1843abort:
1844        free(preq->url);
1845        free(preq);
1846        return NULL;
1847}
1848
1849/* Helpers for fetching objects (loose) */
1850static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1851                               void *data)
1852{
1853        unsigned char expn[4096];
1854        size_t size = eltsize * nmemb;
1855        int posn = 0;
1856        struct http_object_request *freq =
1857                (struct http_object_request *)data;
1858        do {
1859                ssize_t retval = xwrite(freq->localfile,
1860                                        (char *) ptr + posn, size - posn);
1861                if (retval < 0)
1862                        return posn;
1863                posn += retval;
1864        } while (posn < size);
1865
1866        freq->stream.avail_in = size;
1867        freq->stream.next_in = (void *)ptr;
1868        do {
1869                freq->stream.next_out = expn;
1870                freq->stream.avail_out = sizeof(expn);
1871                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1872                git_SHA1_Update(&freq->c, expn,
1873                                sizeof(expn) - freq->stream.avail_out);
1874        } while (freq->stream.avail_in && freq->zret == Z_OK);
1875        return size;
1876}
1877
1878struct http_object_request *new_http_object_request(const char *base_url,
1879        unsigned char *sha1)
1880{
1881        char *hex = sha1_to_hex(sha1);
1882        const char *filename;
1883        char prevfile[PATH_MAX];
1884        int prevlocal;
1885        char prev_buf[PREV_BUF_SIZE];
1886        ssize_t prev_read = 0;
1887        off_t prev_posn = 0;
1888        struct http_object_request *freq;
1889
1890        freq = xcalloc(1, sizeof(*freq));
1891        hashcpy(freq->sha1, sha1);
1892        freq->localfile = -1;
1893
1894        filename = sha1_file_name(sha1);
1895        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1896                 "%s.temp", filename);
1897
1898        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1899        unlink_or_warn(prevfile);
1900        rename(freq->tmpfile, prevfile);
1901        unlink_or_warn(freq->tmpfile);
1902
1903        if (freq->localfile != -1)
1904                error("fd leakage in start: %d", freq->localfile);
1905        freq->localfile = open(freq->tmpfile,
1906                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1907        /*
1908         * This could have failed due to the "lazy directory creation";
1909         * try to mkdir the last path component.
1910         */
1911        if (freq->localfile < 0 && errno == ENOENT) {
1912                char *dir = strrchr(freq->tmpfile, '/');
1913                if (dir) {
1914                        *dir = 0;
1915                        mkdir(freq->tmpfile, 0777);
1916                        *dir = '/';
1917                }
1918                freq->localfile = open(freq->tmpfile,
1919                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1920        }
1921
1922        if (freq->localfile < 0) {
1923                error("Couldn't create temporary file %s: %s",
1924                      freq->tmpfile, strerror(errno));
1925                goto abort;
1926        }
1927
1928        git_inflate_init(&freq->stream);
1929
1930        git_SHA1_Init(&freq->c);
1931
1932        freq->url = get_remote_object_url(base_url, hex, 0);
1933
1934        /*
1935         * If a previous temp file is present, process what was already
1936         * fetched.
1937         */
1938        prevlocal = open(prevfile, O_RDONLY);
1939        if (prevlocal != -1) {
1940                do {
1941                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1942                        if (prev_read>0) {
1943                                if (fwrite_sha1_file(prev_buf,
1944                                                     1,
1945                                                     prev_read,
1946                                                     freq) == prev_read) {
1947                                        prev_posn += prev_read;
1948                                } else {
1949                                        prev_read = -1;
1950                                }
1951                        }
1952                } while (prev_read > 0);
1953                close(prevlocal);
1954        }
1955        unlink_or_warn(prevfile);
1956
1957        /*
1958         * Reset inflate/SHA1 if there was an error reading the previous temp
1959         * file; also rewind to the beginning of the local file.
1960         */
1961        if (prev_read == -1) {
1962                memset(&freq->stream, 0, sizeof(freq->stream));
1963                git_inflate_init(&freq->stream);
1964                git_SHA1_Init(&freq->c);
1965                if (prev_posn>0) {
1966                        prev_posn = 0;
1967                        lseek(freq->localfile, 0, SEEK_SET);
1968                        if (ftruncate(freq->localfile, 0) < 0) {
1969                                error("Couldn't truncate temporary file %s: %s",
1970                                          freq->tmpfile, strerror(errno));
1971                                goto abort;
1972                        }
1973                }
1974        }
1975
1976        freq->slot = get_active_slot();
1977
1978        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1979        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1980        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1981        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1982        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1983
1984        /*
1985         * If we have successfully processed data from a previous fetch
1986         * attempt, only fetch the data we don't already have.
1987         */
1988        if (prev_posn>0) {
1989                if (http_is_verbose)
1990                        fprintf(stderr,
1991                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1992                                hex, (uintmax_t)prev_posn);
1993                http_opt_request_remainder(freq->slot->curl, prev_posn);
1994        }
1995
1996        return freq;
1997
1998abort:
1999        free(freq->url);
2000        free(freq);
2001        return NULL;
2002}
2003
2004void process_http_object_request(struct http_object_request *freq)
2005{
2006        if (freq->slot == NULL)
2007                return;
2008        freq->curl_result = freq->slot->curl_result;
2009        freq->http_code = freq->slot->http_code;
2010        freq->slot = NULL;
2011}
2012
2013int finish_http_object_request(struct http_object_request *freq)
2014{
2015        struct stat st;
2016
2017        close(freq->localfile);
2018        freq->localfile = -1;
2019
2020        process_http_object_request(freq);
2021
2022        if (freq->http_code == 416) {
2023                warning("requested range invalid; we may already have all the data.");
2024        } else if (freq->curl_result != CURLE_OK) {
2025                if (stat(freq->tmpfile, &st) == 0)
2026                        if (st.st_size == 0)
2027                                unlink_or_warn(freq->tmpfile);
2028                return -1;
2029        }
2030
2031        git_inflate_end(&freq->stream);
2032        git_SHA1_Final(freq->real_sha1, &freq->c);
2033        if (freq->zret != Z_STREAM_END) {
2034                unlink_or_warn(freq->tmpfile);
2035                return -1;
2036        }
2037        if (hashcmp(freq->sha1, freq->real_sha1)) {
2038                unlink_or_warn(freq->tmpfile);
2039                return -1;
2040        }
2041        freq->rename =
2042                finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2043
2044        return freq->rename;
2045}
2046
2047void abort_http_object_request(struct http_object_request *freq)
2048{
2049        unlink_or_warn(freq->tmpfile);
2050
2051        release_http_object_request(freq);
2052}
2053
2054void release_http_object_request(struct http_object_request *freq)
2055{
2056        if (freq->localfile != -1) {
2057                close(freq->localfile);
2058                freq->localfile = -1;
2059        }
2060        if (freq->url != NULL) {
2061                free(freq->url);
2062                freq->url = NULL;
2063        }
2064        if (freq->slot != NULL) {
2065                freq->slot->callback_func = NULL;
2066                freq->slot->callback_data = NULL;
2067                release_active_slot(freq->slot);
2068                freq->slot = NULL;
2069        }
2070}