Andrew's git - gitweb.git/blob

   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
  14static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
  15#if LIBCURL_VERSION_NUM >= 0x070a08
  16long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  17#else
  18long int git_curl_ipresolve;
  19#endif
  20int active_requests;
  21int http_is_verbose;
  22size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  23
  24#if LIBCURL_VERSION_NUM >= 0x070a06
  25#define LIBCURL_CAN_HANDLE_AUTH_ANY
  26#endif
  27
  28static int min_curl_sessions = 1;
  29static int curl_session_count;
  30#ifdef USE_CURL_MULTI
  31static int max_requests = -1;
  32static CURLM *curlm;
  33#endif
  34#ifndef NO_CURL_EASY_DUPHANDLE
  35static CURL *curl_default;
  36#endif
  37
  38#define PREV_BUF_SIZE 4096
  39
  40char curl_errorstr[CURL_ERROR_SIZE];
  41
  42static int curl_ssl_verify = -1;
  43static int curl_ssl_try;
  44static const char *ssl_cert;
  45static const char *ssl_cipherlist;
  46static const char *ssl_version;
  47static struct {
  48        const char *name;
  49        long ssl_version;
  50} sslversions[] = {
  51        { "sslv2", CURL_SSLVERSION_SSLv2 },
  52        { "sslv3", CURL_SSLVERSION_SSLv3 },
  53        { "tlsv1", CURL_SSLVERSION_TLSv1 },
  54#if LIBCURL_VERSION_NUM >= 0x072200
  55        { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  56        { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  57        { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  58#endif
  59};
  60#if LIBCURL_VERSION_NUM >= 0x070903
  61static const char *ssl_key;
  62#endif
  63#if LIBCURL_VERSION_NUM >= 0x070908
  64static const char *ssl_capath;
  65#endif
  66#if LIBCURL_VERSION_NUM >= 0x072c00
  67static const char *ssl_pinnedkey;
  68#endif
  69static const char *ssl_cainfo;
  70static long curl_low_speed_limit = -1;
  71static long curl_low_speed_time = -1;
  72static int curl_ftp_no_epsv;
  73static const char *curl_http_proxy;
  74static const char *curl_no_proxy;
  75static const char *http_proxy_authmethod;
  76static struct {
  77        const char *name;
  78        long curlauth_param;
  79} proxy_authmethods[] = {
  80        { "basic", CURLAUTH_BASIC },
  81        { "digest", CURLAUTH_DIGEST },
  82        { "negotiate", CURLAUTH_GSSNEGOTIATE },
  83        { "ntlm", CURLAUTH_NTLM },
  84#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  85        { "anyauth", CURLAUTH_ANY },
  86#endif
  87        /*
  88         * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  89         * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  90         * here, too
  91         */
  92};
  93#if LIBCURL_VERSION_NUM >= 0x071600
  94static const char *curl_deleg;
  95static struct {
  96        const char *name;
  97        long curl_deleg_param;
  98} curl_deleg_levels[] = {
  99        { "none", CURLGSSAPI_DELEGATION_NONE },
 100        { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
 101        { "always", CURLGSSAPI_DELEGATION_FLAG },
 102};
 103#endif
 104
 105static struct credential proxy_auth = CREDENTIAL_INIT;
 106static const char *curl_proxyuserpwd;
 107static const char *curl_cookie_file;
 108static int curl_save_cookies;
 109struct credential http_auth = CREDENTIAL_INIT;
 110static int http_proactive_auth;
 111static const char *user_agent;
 112static int curl_empty_auth;
 113
 114#if LIBCURL_VERSION_NUM >= 0x071700
 115/* Use CURLOPT_KEYPASSWD as is */
 116#elif LIBCURL_VERSION_NUM >= 0x070903
 117#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 118#else
 119#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 120#endif
 121
 122static struct credential cert_auth = CREDENTIAL_INIT;
 123static int ssl_cert_password_required;
 124#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 125static unsigned long http_auth_methods = CURLAUTH_ANY;
 126#endif
 127
 128static struct curl_slist *pragma_header;
 129static struct curl_slist *no_pragma_header;
 130static struct curl_slist *extra_http_headers;
 131
 132static struct active_request_slot *active_queue_head;
 133
 134static char *cached_accept_language;
 135
 136size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 137{
 138        size_t size = eltsize * nmemb;
 139        struct buffer *buffer = buffer_;
 140
 141        if (size > buffer->buf.len - buffer->posn)
 142                size = buffer->buf.len - buffer->posn;
 143        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 144        buffer->posn += size;
 145
 146        return size;
 147}
 148
 149#ifndef NO_CURL_IOCTL
 150curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 151{
 152        struct buffer *buffer = clientp;
 153
 154        switch (cmd) {
 155        case CURLIOCMD_NOP:
 156                return CURLIOE_OK;
 157
 158        case CURLIOCMD_RESTARTREAD:
 159                buffer->posn = 0;
 160                return CURLIOE_OK;
 161
 162        default:
 163                return CURLIOE_UNKNOWNCMD;
 164        }
 165}
 166#endif
 167
 168size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 169{
 170        size_t size = eltsize * nmemb;
 171        struct strbuf *buffer = buffer_;
 172
 173        strbuf_add(buffer, ptr, size);
 174        return size;
 175}
 176
 177size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 178{
 179        return eltsize * nmemb;
 180}
 181
 182static void closedown_active_slot(struct active_request_slot *slot)
 183{
 184        active_requests--;
 185        slot->in_use = 0;
 186}
 187
 188static void finish_active_slot(struct active_request_slot *slot)
 189{
 190        closedown_active_slot(slot);
 191        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 192
 193        if (slot->finished != NULL)
 194                (*slot->finished) = 1;
 195
 196        /* Store slot results so they can be read after the slot is reused */
 197        if (slot->results != NULL) {
 198                slot->results->curl_result = slot->curl_result;
 199                slot->results->http_code = slot->http_code;
 200#if LIBCURL_VERSION_NUM >= 0x070a08
 201                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 202                                  &slot->results->auth_avail);
 203#else
 204                slot->results->auth_avail = 0;
 205#endif
 206
 207                curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 208                        &slot->results->http_connectcode);
 209        }
 210
 211        /* Run callback if appropriate */
 212        if (slot->callback_func != NULL)
 213                slot->callback_func(slot->callback_data);
 214}
 215
 216#ifdef USE_CURL_MULTI
 217static void process_curl_messages(void)
 218{
 219        int num_messages;
 220        struct active_request_slot *slot;
 221        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 222
 223        while (curl_message != NULL) {
 224                if (curl_message->msg == CURLMSG_DONE) {
 225                        int curl_result = curl_message->data.result;
 226                        slot = active_queue_head;
 227                        while (slot != NULL &&
 228                               slot->curl != curl_message->easy_handle)
 229                                slot = slot->next;
 230                        if (slot != NULL) {
 231                                curl_multi_remove_handle(curlm, slot->curl);
 232                                slot->curl_result = curl_result;
 233                                finish_active_slot(slot);
 234                        } else {
 235                                fprintf(stderr, "Received DONE message for unknown request!\n");
 236                        }
 237                } else {
 238                        fprintf(stderr, "Unknown CURL message received: %d\n",
 239                                (int)curl_message->msg);
 240                }
 241                curl_message = curl_multi_info_read(curlm, &num_messages);
 242        }
 243}
 244#endif
 245
 246static int http_options(const char *var, const char *value, void *cb)
 247{
 248        if (!strcmp("http.sslverify", var)) {
 249                curl_ssl_verify = git_config_bool(var, value);
 250                return 0;
 251        }
 252        if (!strcmp("http.sslcipherlist", var))
 253                return git_config_string(&ssl_cipherlist, var, value);
 254        if (!strcmp("http.sslversion", var))
 255                return git_config_string(&ssl_version, var, value);
 256        if (!strcmp("http.sslcert", var))
 257                return git_config_string(&ssl_cert, var, value);
 258#if LIBCURL_VERSION_NUM >= 0x070903
 259        if (!strcmp("http.sslkey", var))
 260                return git_config_string(&ssl_key, var, value);
 261#endif
 262#if LIBCURL_VERSION_NUM >= 0x070908
 263        if (!strcmp("http.sslcapath", var))
 264                return git_config_pathname(&ssl_capath, var, value);
 265#endif
 266        if (!strcmp("http.sslcainfo", var))
 267                return git_config_pathname(&ssl_cainfo, var, value);
 268        if (!strcmp("http.sslcertpasswordprotected", var)) {
 269                ssl_cert_password_required = git_config_bool(var, value);
 270                return 0;
 271        }
 272        if (!strcmp("http.ssltry", var)) {
 273                curl_ssl_try = git_config_bool(var, value);
 274                return 0;
 275        }
 276        if (!strcmp("http.minsessions", var)) {
 277                min_curl_sessions = git_config_int(var, value);
 278#ifndef USE_CURL_MULTI
 279                if (min_curl_sessions > 1)
 280                        min_curl_sessions = 1;
 281#endif
 282                return 0;
 283        }
 284#ifdef USE_CURL_MULTI
 285        if (!strcmp("http.maxrequests", var)) {
 286                max_requests = git_config_int(var, value);
 287                return 0;
 288        }
 289#endif
 290        if (!strcmp("http.lowspeedlimit", var)) {
 291                curl_low_speed_limit = (long)git_config_int(var, value);
 292                return 0;
 293        }
 294        if (!strcmp("http.lowspeedtime", var)) {
 295                curl_low_speed_time = (long)git_config_int(var, value);
 296                return 0;
 297        }
 298
 299        if (!strcmp("http.noepsv", var)) {
 300                curl_ftp_no_epsv = git_config_bool(var, value);
 301                return 0;
 302        }
 303        if (!strcmp("http.proxy", var))
 304                return git_config_string(&curl_http_proxy, var, value);
 305
 306        if (!strcmp("http.proxyauthmethod", var))
 307                return git_config_string(&http_proxy_authmethod, var, value);
 308
 309        if (!strcmp("http.cookiefile", var))
 310                return git_config_pathname(&curl_cookie_file, var, value);
 311        if (!strcmp("http.savecookies", var)) {
 312                curl_save_cookies = git_config_bool(var, value);
 313                return 0;
 314        }
 315
 316        if (!strcmp("http.postbuffer", var)) {
 317                http_post_buffer = git_config_int(var, value);
 318                if (http_post_buffer < LARGE_PACKET_MAX)
 319                        http_post_buffer = LARGE_PACKET_MAX;
 320                return 0;
 321        }
 322
 323        if (!strcmp("http.useragent", var))
 324                return git_config_string(&user_agent, var, value);
 325
 326        if (!strcmp("http.emptyauth", var)) {
 327                curl_empty_auth = git_config_bool(var, value);
 328                return 0;
 329        }
 330
 331        if (!strcmp("http.delegation", var)) {
 332#if LIBCURL_VERSION_NUM >= 0x071600
 333                return git_config_string(&curl_deleg, var, value);
 334#else
 335                warning(_("Delegation control is not supported with cURL < 7.22.0"));
 336                return 0;
 337#endif
 338        }
 339
 340        if (!strcmp("http.pinnedpubkey", var)) {
 341#if LIBCURL_VERSION_NUM >= 0x072c00
 342                return git_config_pathname(&ssl_pinnedkey, var, value);
 343#else
 344                warning(_("Public key pinning not supported with cURL < 7.44.0"));
 345                return 0;
 346#endif
 347        }
 348
 349        if (!strcmp("http.extraheader", var)) {
 350                if (!value) {
 351                        return config_error_nonbool(var);
 352                } else if (!*value) {
 353                        curl_slist_free_all(extra_http_headers);
 354                        extra_http_headers = NULL;
 355                } else {
 356                        extra_http_headers =
 357                                curl_slist_append(extra_http_headers, value);
 358                }
 359                return 0;
 360        }
 361
 362        /* Fall back on the default ones */
 363        return git_default_config(var, value, cb);
 364}
 365
 366static void init_curl_http_auth(CURL *result)
 367{
 368        if (!http_auth.username) {
 369                if (curl_empty_auth)
 370                        curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 371                return;
 372        }
 373
 374        credential_fill(&http_auth);
 375
 376#if LIBCURL_VERSION_NUM >= 0x071301
 377        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 378        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 379#else
 380        {
 381                static struct strbuf up = STRBUF_INIT;
 382                /*
 383                 * Note that we assume we only ever have a single set of
 384                 * credentials in a given program run, so we do not have
 385                 * to worry about updating this buffer, only setting its
 386                 * initial value.
 387                 */
 388                if (!up.len)
 389                        strbuf_addf(&up, "%s:%s",
 390                                http_auth.username, http_auth.password);
 391                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 392        }
 393#endif
 394}
 395
 396/* *var must be free-able */
 397static void var_override(const char **var, char *value)
 398{
 399        if (value) {
 400                free((void *)*var);
 401                *var = xstrdup(value);
 402        }
 403}
 404
 405static void set_proxyauth_name_password(CURL *result)
 406{
 407#if LIBCURL_VERSION_NUM >= 0x071301
 408                curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 409                        proxy_auth.username);
 410                curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 411                        proxy_auth.password);
 412#else
 413                struct strbuf s = STRBUF_INIT;
 414
 415                strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 416                strbuf_addch(&s, ':');
 417                strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 418                curl_proxyuserpwd = strbuf_detach(&s, NULL);
 419                curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 420#endif
 421}
 422
 423static void init_curl_proxy_auth(CURL *result)
 424{
 425        if (proxy_auth.username) {
 426                if (!proxy_auth.password)
 427                        credential_fill(&proxy_auth);
 428                set_proxyauth_name_password(result);
 429        }
 430
 431        var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 432
 433#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 434        if (http_proxy_authmethod) {
 435                int i;
 436                for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 437                        if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 438                                curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 439                                                proxy_authmethods[i].curlauth_param);
 440                                break;
 441                        }
 442                }
 443                if (i == ARRAY_SIZE(proxy_authmethods)) {
 444                        warning("unsupported proxy authentication method %s: using anyauth",
 445                                        http_proxy_authmethod);
 446                        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 447                }
 448        }
 449        else
 450                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 451#endif
 452}
 453
 454static int has_cert_password(void)
 455{
 456        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 457                return 0;
 458        if (!cert_auth.password) {
 459                cert_auth.protocol = xstrdup("cert");
 460                cert_auth.username = xstrdup("");
 461                cert_auth.path = xstrdup(ssl_cert);
 462                credential_fill(&cert_auth);
 463        }
 464        return 1;
 465}
 466
 467#if LIBCURL_VERSION_NUM >= 0x071900
 468static void set_curl_keepalive(CURL *c)
 469{
 470        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 471}
 472
 473#elif LIBCURL_VERSION_NUM >= 0x071000
 474static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 475{
 476        int ka = 1;
 477        int rc;
 478        socklen_t len = (socklen_t)sizeof(ka);
 479
 480        if (type != CURLSOCKTYPE_IPCXN)
 481                return 0;
 482
 483        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 484        if (rc < 0)
 485                warning_errno("unable to set SO_KEEPALIVE on socket");
 486
 487        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 488}
 489
 490static void set_curl_keepalive(CURL *c)
 491{
 492        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 493}
 494
 495#else
 496static void set_curl_keepalive(CURL *c)
 497{
 498        /* not supported on older curl versions */
 499}
 500#endif
 501
 502static void redact_sensitive_header(struct strbuf *header)
 503{
 504        const char *sensitive_header;
 505
 506        if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 507            skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 508                /* The first token is the type, which is OK to log */
 509                while (isspace(*sensitive_header))
 510                        sensitive_header++;
 511                while (*sensitive_header && !isspace(*sensitive_header))
 512                        sensitive_header++;
 513                /* Everything else is opaque and possibly sensitive */
 514                strbuf_setlen(header,  sensitive_header - header->buf);
 515                strbuf_addstr(header, " <redacted>");
 516        }
 517}
 518
 519static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 520{
 521        struct strbuf out = STRBUF_INIT;
 522        struct strbuf **headers, **header;
 523
 524        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 525                text, (long)size, (long)size);
 526        trace_strbuf(&trace_curl, &out);
 527        strbuf_reset(&out);
 528        strbuf_add(&out, ptr, size);
 529        headers = strbuf_split_max(&out, '\n', 0);
 530
 531        for (header = headers; *header; header++) {
 532                if (hide_sensitive_header)
 533                        redact_sensitive_header(*header);
 534                strbuf_insert((*header), 0, text, strlen(text));
 535                strbuf_insert((*header), strlen(text), ": ", 2);
 536                strbuf_rtrim((*header));
 537                strbuf_addch((*header), '\n');
 538                trace_strbuf(&trace_curl, (*header));
 539        }
 540        strbuf_list_free(headers);
 541        strbuf_release(&out);
 542}
 543
 544static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 545{
 546        size_t i;
 547        struct strbuf out = STRBUF_INIT;
 548        unsigned int width = 60;
 549
 550        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 551                text, (long)size, (long)size);
 552        trace_strbuf(&trace_curl, &out);
 553
 554        for (i = 0; i < size; i += width) {
 555                size_t w;
 556
 557                strbuf_reset(&out);
 558                strbuf_addf(&out, "%s: ", text);
 559                for (w = 0; (w < width) && (i + w < size); w++) {
 560                        unsigned char ch = ptr[i + w];
 561
 562                        strbuf_addch(&out,
 563                                       (ch >= 0x20) && (ch < 0x80)
 564                                       ? ch : '.');
 565                }
 566                strbuf_addch(&out, '\n');
 567                trace_strbuf(&trace_curl, &out);
 568        }
 569        strbuf_release(&out);
 570}
 571
 572static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 573{
 574        const char *text;
 575        enum { NO_FILTER = 0, DO_FILTER = 1 };
 576
 577        switch (type) {
 578        case CURLINFO_TEXT:
 579                trace_printf_key(&trace_curl, "== Info: %s", data);
 580        default:                /* we ignore unknown types by default */
 581                return 0;
 582
 583        case CURLINFO_HEADER_OUT:
 584                text = "=> Send header";
 585                curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 586                break;
 587        case CURLINFO_DATA_OUT:
 588                text = "=> Send data";
 589                curl_dump_data(text, (unsigned char *)data, size);
 590                break;
 591        case CURLINFO_SSL_DATA_OUT:
 592                text = "=> Send SSL data";
 593                curl_dump_data(text, (unsigned char *)data, size);
 594                break;
 595        case CURLINFO_HEADER_IN:
 596                text = "<= Recv header";
 597                curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 598                break;
 599        case CURLINFO_DATA_IN:
 600                text = "<= Recv data";
 601                curl_dump_data(text, (unsigned char *)data, size);
 602                break;
 603        case CURLINFO_SSL_DATA_IN:
 604                text = "<= Recv SSL data";
 605                curl_dump_data(text, (unsigned char *)data, size);
 606                break;
 607        }
 608        return 0;
 609}
 610
 611void setup_curl_trace(CURL *handle)
 612{
 613        if (!trace_want(&trace_curl))
 614                return;
 615        curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 616        curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 617        curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 618}
 619
 620
 621static CURL *get_curl_handle(void)
 622{
 623        CURL *result = curl_easy_init();
 624        long allowed_protocols = 0;
 625
 626        if (!result)
 627                die("curl_easy_init failed");
 628
 629        if (!curl_ssl_verify) {
 630                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 631                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 632        } else {
 633                /* Verify authenticity of the peer's certificate */
 634                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 635                /* The name in the cert must match whom we tried to connect */
 636                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 637        }
 638
 639#if LIBCURL_VERSION_NUM >= 0x070907
 640        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 641#endif
 642#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 643        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 644#endif
 645
 646#if LIBCURL_VERSION_NUM >= 0x071600
 647        if (curl_deleg) {
 648                int i;
 649                for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
 650                        if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
 651                                curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
 652                                                curl_deleg_levels[i].curl_deleg_param);
 653                                break;
 654                        }
 655                }
 656                if (i == ARRAY_SIZE(curl_deleg_levels))
 657                        warning("Unknown delegation method '%s': using default",
 658                                curl_deleg);
 659        }
 660#endif
 661
 662        if (http_proactive_auth)
 663                init_curl_http_auth(result);
 664
 665        if (getenv("GIT_SSL_VERSION"))
 666                ssl_version = getenv("GIT_SSL_VERSION");
 667        if (ssl_version && *ssl_version) {
 668                int i;
 669                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 670                        if (!strcmp(ssl_version, sslversions[i].name)) {
 671                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 672                                                 sslversions[i].ssl_version);
 673                                break;
 674                        }
 675                }
 676                if (i == ARRAY_SIZE(sslversions))
 677                        warning("unsupported ssl version %s: using default",
 678                                ssl_version);
 679        }
 680
 681        if (getenv("GIT_SSL_CIPHER_LIST"))
 682                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 683        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 684                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 685                                ssl_cipherlist);
 686
 687        if (ssl_cert != NULL)
 688                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 689        if (has_cert_password())
 690                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 691#if LIBCURL_VERSION_NUM >= 0x070903
 692        if (ssl_key != NULL)
 693                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 694#endif
 695#if LIBCURL_VERSION_NUM >= 0x070908
 696        if (ssl_capath != NULL)
 697                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 698#endif
 699#if LIBCURL_VERSION_NUM >= 0x072c00
 700        if (ssl_pinnedkey != NULL)
 701                curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 702#endif
 703        if (ssl_cainfo != NULL)
 704                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 705
 706        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 707                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 708                                 curl_low_speed_limit);
 709                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 710                                 curl_low_speed_time);
 711        }
 712
 713        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 714        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 715#if LIBCURL_VERSION_NUM >= 0x071301
 716        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 717#elif LIBCURL_VERSION_NUM >= 0x071101
 718        curl_easy_setopt(result, CURLOPT_POST301, 1);
 719#endif
 720#if LIBCURL_VERSION_NUM >= 0x071304
 721        if (is_transport_allowed("http"))
 722                allowed_protocols |= CURLPROTO_HTTP;
 723        if (is_transport_allowed("https"))
 724                allowed_protocols |= CURLPROTO_HTTPS;
 725        if (is_transport_allowed("ftp"))
 726                allowed_protocols |= CURLPROTO_FTP;
 727        if (is_transport_allowed("ftps"))
 728                allowed_protocols |= CURLPROTO_FTPS;
 729        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 730#else
 731        if (transport_restrict_protocols())
 732                warning("protocol restrictions not applied to curl redirects because\n"
 733                        "your curl version is too old (>= 7.19.4)");
 734#endif
 735        if (getenv("GIT_CURL_VERBOSE"))
 736                curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
 737        setup_curl_trace(result);
 738
 739        curl_easy_setopt(result, CURLOPT_USERAGENT,
 740                user_agent ? user_agent : git_user_agent());
 741
 742        if (curl_ftp_no_epsv)
 743                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 744
 745#ifdef CURLOPT_USE_SSL
 746        if (curl_ssl_try)
 747                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 748#endif
 749
 750        /*
 751         * CURL also examines these variables as a fallback; but we need to query
 752         * them here in order to decide whether to prompt for missing password (cf.
 753         * init_curl_proxy_auth()).
 754         *
 755         * Unlike many other common environment variables, these are historically
 756         * lowercase only. It appears that CURL did not know this and implemented
 757         * only uppercase variants, which was later corrected to take both - with
 758         * the exception of http_proxy, which is lowercase only also in CURL. As
 759         * the lowercase versions are the historical quasi-standard, they take
 760         * precedence here, as in CURL.
 761         */
 762        if (!curl_http_proxy) {
 763                if (!strcmp(http_auth.protocol, "https")) {
 764                        var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 765                        var_override(&curl_http_proxy, getenv("https_proxy"));
 766                } else {
 767                        var_override(&curl_http_proxy, getenv("http_proxy"));
 768                }
 769                if (!curl_http_proxy) {
 770                        var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 771                        var_override(&curl_http_proxy, getenv("all_proxy"));
 772                }
 773        }
 774
 775        if (curl_http_proxy) {
 776                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 777#if LIBCURL_VERSION_NUM >= 0x071800
 778                if (starts_with(curl_http_proxy, "socks5h"))
 779                        curl_easy_setopt(result,
 780                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
 781                else if (starts_with(curl_http_proxy, "socks5"))
 782                        curl_easy_setopt(result,
 783                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 784                else if (starts_with(curl_http_proxy, "socks4a"))
 785                        curl_easy_setopt(result,
 786                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 787                else if (starts_with(curl_http_proxy, "socks"))
 788                        curl_easy_setopt(result,
 789                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 790#endif
 791                if (strstr(curl_http_proxy, "://"))
 792                        credential_from_url(&proxy_auth, curl_http_proxy);
 793                else {
 794                        struct strbuf url = STRBUF_INIT;
 795                        strbuf_addf(&url, "http://%s", curl_http_proxy);
 796                        credential_from_url(&proxy_auth, url.buf);
 797                        strbuf_release(&url);
 798                }
 799
 800                curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 801#if LIBCURL_VERSION_NUM >= 0x071304
 802                var_override(&curl_no_proxy, getenv("NO_PROXY"));
 803                var_override(&curl_no_proxy, getenv("no_proxy"));
 804                curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 805#endif
 806        }
 807        init_curl_proxy_auth(result);
 808
 809        set_curl_keepalive(result);
 810
 811        return result;
 812}
 813
 814static void set_from_env(const char **var, const char *envname)
 815{
 816        const char *val = getenv(envname);
 817        if (val)
 818                *var = val;
 819}
 820
 821void http_init(struct remote *remote, const char *url, int proactive_auth)
 822{
 823        char *low_speed_limit;
 824        char *low_speed_time;
 825        char *normalized_url;
 826        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 827
 828        config.section = "http";
 829        config.key = NULL;
 830        config.collect_fn = http_options;
 831        config.cascade_fn = git_default_config;
 832        config.cb = NULL;
 833
 834        http_is_verbose = 0;
 835        normalized_url = url_normalize(url, &config.url);
 836
 837        git_config(urlmatch_config_entry, &config);
 838        free(normalized_url);
 839
 840        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 841                die("curl_global_init failed");
 842
 843        http_proactive_auth = proactive_auth;
 844
 845        if (remote && remote->http_proxy)
 846                curl_http_proxy = xstrdup(remote->http_proxy);
 847
 848        if (remote)
 849                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 850
 851        pragma_header = curl_slist_append(http_copy_default_headers(),
 852                "Pragma: no-cache");
 853        no_pragma_header = curl_slist_append(http_copy_default_headers(),
 854                "Pragma:");
 855
 856#ifdef USE_CURL_MULTI
 857        {
 858                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 859                if (http_max_requests != NULL)
 860                        max_requests = atoi(http_max_requests);
 861        }
 862
 863        curlm = curl_multi_init();
 864        if (!curlm)
 865                die("curl_multi_init failed");
 866#endif
 867
 868        if (getenv("GIT_SSL_NO_VERIFY"))
 869                curl_ssl_verify = 0;
 870
 871        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 872#if LIBCURL_VERSION_NUM >= 0x070903
 873        set_from_env(&ssl_key, "GIT_SSL_KEY");
 874#endif
 875#if LIBCURL_VERSION_NUM >= 0x070908
 876        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 877#endif
 878        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 879
 880        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 881
 882        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 883        if (low_speed_limit != NULL)
 884                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 885        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 886        if (low_speed_time != NULL)
 887                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 888
 889        if (curl_ssl_verify == -1)
 890                curl_ssl_verify = 1;
 891
 892        curl_session_count = 0;
 893#ifdef USE_CURL_MULTI
 894        if (max_requests < 1)
 895                max_requests = DEFAULT_MAX_REQUESTS;
 896#endif
 897
 898        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 899                curl_ftp_no_epsv = 1;
 900
 901        if (url) {
 902                credential_from_url(&http_auth, url);
 903                if (!ssl_cert_password_required &&
 904                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 905                    starts_with(url, "https://"))
 906                        ssl_cert_password_required = 1;
 907        }
 908
 909#ifndef NO_CURL_EASY_DUPHANDLE
 910        curl_default = get_curl_handle();
 911#endif
 912}
 913
 914void http_cleanup(void)
 915{
 916        struct active_request_slot *slot = active_queue_head;
 917
 918        while (slot != NULL) {
 919                struct active_request_slot *next = slot->next;
 920                if (slot->curl != NULL) {
 921#ifdef USE_CURL_MULTI
 922                        curl_multi_remove_handle(curlm, slot->curl);
 923#endif
 924                        curl_easy_cleanup(slot->curl);
 925                }
 926                free(slot);
 927                slot = next;
 928        }
 929        active_queue_head = NULL;
 930
 931#ifndef NO_CURL_EASY_DUPHANDLE
 932        curl_easy_cleanup(curl_default);
 933#endif
 934
 935#ifdef USE_CURL_MULTI
 936        curl_multi_cleanup(curlm);
 937#endif
 938        curl_global_cleanup();
 939
 940        curl_slist_free_all(extra_http_headers);
 941        extra_http_headers = NULL;
 942
 943        curl_slist_free_all(pragma_header);
 944        pragma_header = NULL;
 945
 946        curl_slist_free_all(no_pragma_header);
 947        no_pragma_header = NULL;
 948
 949        if (curl_http_proxy) {
 950                free((void *)curl_http_proxy);
 951                curl_http_proxy = NULL;
 952        }
 953
 954        if (proxy_auth.password) {
 955                memset(proxy_auth.password, 0, strlen(proxy_auth.password));
 956                free(proxy_auth.password);
 957                proxy_auth.password = NULL;
 958        }
 959
 960        free((void *)curl_proxyuserpwd);
 961        curl_proxyuserpwd = NULL;
 962
 963        free((void *)http_proxy_authmethod);
 964        http_proxy_authmethod = NULL;
 965
 966        if (cert_auth.password != NULL) {
 967                memset(cert_auth.password, 0, strlen(cert_auth.password));
 968                free(cert_auth.password);
 969                cert_auth.password = NULL;
 970        }
 971        ssl_cert_password_required = 0;
 972
 973        free(cached_accept_language);
 974        cached_accept_language = NULL;
 975}
 976
 977struct active_request_slot *get_active_slot(void)
 978{
 979        struct active_request_slot *slot = active_queue_head;
 980        struct active_request_slot *newslot;
 981
 982#ifdef USE_CURL_MULTI
 983        int num_transfers;
 984
 985        /* Wait for a slot to open up if the queue is full */
 986        while (active_requests >= max_requests) {
 987                curl_multi_perform(curlm, &num_transfers);
 988                if (num_transfers < active_requests)
 989                        process_curl_messages();
 990        }
 991#endif
 992
 993        while (slot != NULL && slot->in_use)
 994                slot = slot->next;
 995
 996        if (slot == NULL) {
 997                newslot = xmalloc(sizeof(*newslot));
 998                newslot->curl = NULL;
 999                newslot->in_use = 0;
1000                newslot->next = NULL;
1001
1002                slot = active_queue_head;
1003                if (slot == NULL) {
1004                        active_queue_head = newslot;
1005                } else {
1006                        while (slot->next != NULL)
1007                                slot = slot->next;
1008                        slot->next = newslot;
1009                }
1010                slot = newslot;
1011        }
1012
1013        if (slot->curl == NULL) {
1014#ifdef NO_CURL_EASY_DUPHANDLE
1015                slot->curl = get_curl_handle();
1016#else
1017                slot->curl = curl_easy_duphandle(curl_default);
1018#endif
1019                curl_session_count++;
1020        }
1021
1022        active_requests++;
1023        slot->in_use = 1;
1024        slot->results = NULL;
1025        slot->finished = NULL;
1026        slot->callback_data = NULL;
1027        slot->callback_func = NULL;
1028        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1029        if (curl_save_cookies)
1030                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1031        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1032        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1033        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1034        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1035        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1036        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1037        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1038        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1039        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1040        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1041
1042#if LIBCURL_VERSION_NUM >= 0x070a08
1043        curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1044#endif
1045#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1046        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1047#endif
1048        if (http_auth.password || curl_empty_auth)
1049                init_curl_http_auth(slot->curl);
1050
1051        return slot;
1052}
1053
1054int start_active_slot(struct active_request_slot *slot)
1055{
1056#ifdef USE_CURL_MULTI
1057        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1058        int num_transfers;
1059
1060        if (curlm_result != CURLM_OK &&
1061            curlm_result != CURLM_CALL_MULTI_PERFORM) {
1062                active_requests--;
1063                slot->in_use = 0;
1064                return 0;
1065        }
1066
1067        /*
1068         * We know there must be something to do, since we just added
1069         * something.
1070         */
1071        curl_multi_perform(curlm, &num_transfers);
1072#endif
1073        return 1;
1074}
1075
1076#ifdef USE_CURL_MULTI
1077struct fill_chain {
1078        void *data;
1079        int (*fill)(void *);
1080        struct fill_chain *next;
1081};
1082
1083static struct fill_chain *fill_cfg;
1084
1085void add_fill_function(void *data, int (*fill)(void *))
1086{
1087        struct fill_chain *new = xmalloc(sizeof(*new));
1088        struct fill_chain **linkp = &fill_cfg;
1089        new->data = data;
1090        new->fill = fill;
1091        new->next = NULL;
1092        while (*linkp)
1093                linkp = &(*linkp)->next;
1094        *linkp = new;
1095}
1096
1097void fill_active_slots(void)
1098{
1099        struct active_request_slot *slot = active_queue_head;
1100
1101        while (active_requests < max_requests) {
1102                struct fill_chain *fill;
1103                for (fill = fill_cfg; fill; fill = fill->next)
1104                        if (fill->fill(fill->data))
1105                                break;
1106
1107                if (!fill)
1108                        break;
1109        }
1110
1111        while (slot != NULL) {
1112                if (!slot->in_use && slot->curl != NULL
1113                        && curl_session_count > min_curl_sessions) {
1114                        curl_easy_cleanup(slot->curl);
1115                        slot->curl = NULL;
1116                        curl_session_count--;
1117                }
1118                slot = slot->next;
1119        }
1120}
1121
1122void step_active_slots(void)
1123{
1124        int num_transfers;
1125        CURLMcode curlm_result;
1126
1127        do {
1128                curlm_result = curl_multi_perform(curlm, &num_transfers);
1129        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1130        if (num_transfers < active_requests) {
1131                process_curl_messages();
1132                fill_active_slots();
1133        }
1134}
1135#endif
1136
1137void run_active_slot(struct active_request_slot *slot)
1138{
1139#ifdef USE_CURL_MULTI
1140        fd_set readfds;
1141        fd_set writefds;
1142        fd_set excfds;
1143        int max_fd;
1144        struct timeval select_timeout;
1145        int finished = 0;
1146
1147        slot->finished = &finished;
1148        while (!finished) {
1149                step_active_slots();
1150
1151                if (slot->in_use) {
1152#if LIBCURL_VERSION_NUM >= 0x070f04
1153                        long curl_timeout;
1154                        curl_multi_timeout(curlm, &curl_timeout);
1155                        if (curl_timeout == 0) {
1156                                continue;
1157                        } else if (curl_timeout == -1) {
1158                                select_timeout.tv_sec  = 0;
1159                                select_timeout.tv_usec = 50000;
1160                        } else {
1161                                select_timeout.tv_sec  =  curl_timeout / 1000;
1162                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1163                        }
1164#else
1165                        select_timeout.tv_sec  = 0;
1166                        select_timeout.tv_usec = 50000;
1167#endif
1168
1169                        max_fd = -1;
1170                        FD_ZERO(&readfds);
1171                        FD_ZERO(&writefds);
1172                        FD_ZERO(&excfds);
1173                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1174
1175                        /*
1176                         * It can happen that curl_multi_timeout returns a pathologically
1177                         * long timeout when curl_multi_fdset returns no file descriptors
1178                         * to read.  See commit message for more details.
1179                         */
1180                        if (max_fd < 0 &&
1181                            (select_timeout.tv_sec > 0 ||
1182                             select_timeout.tv_usec > 50000)) {
1183                                select_timeout.tv_sec  = 0;
1184                                select_timeout.tv_usec = 50000;
1185                        }
1186
1187                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1188                }
1189        }
1190#else
1191        while (slot->in_use) {
1192                slot->curl_result = curl_easy_perform(slot->curl);
1193                finish_active_slot(slot);
1194        }
1195#endif
1196}
1197
1198static void release_active_slot(struct active_request_slot *slot)
1199{
1200        closedown_active_slot(slot);
1201        if (slot->curl && curl_session_count > min_curl_sessions) {
1202#ifdef USE_CURL_MULTI
1203                curl_multi_remove_handle(curlm, slot->curl);
1204#endif
1205                curl_easy_cleanup(slot->curl);
1206                slot->curl = NULL;
1207                curl_session_count--;
1208        }
1209#ifdef USE_CURL_MULTI
1210        fill_active_slots();
1211#endif
1212}
1213
1214void finish_all_active_slots(void)
1215{
1216        struct active_request_slot *slot = active_queue_head;
1217
1218        while (slot != NULL)
1219                if (slot->in_use) {
1220                        run_active_slot(slot);
1221                        slot = active_queue_head;
1222                } else {
1223                        slot = slot->next;
1224                }
1225}
1226
1227/* Helpers for modifying and creating URLs */
1228static inline int needs_quote(int ch)
1229{
1230        if (((ch >= 'A') && (ch <= 'Z'))
1231                        || ((ch >= 'a') && (ch <= 'z'))
1232                        || ((ch >= '0') && (ch <= '9'))
1233                        || (ch == '/')
1234                        || (ch == '-')
1235                        || (ch == '.'))
1236                return 0;
1237        return 1;
1238}
1239
1240static char *quote_ref_url(const char *base, const char *ref)
1241{
1242        struct strbuf buf = STRBUF_INIT;
1243        const char *cp;
1244        int ch;
1245
1246        end_url_with_slash(&buf, base);
1247
1248        for (cp = ref; (ch = *cp) != 0; cp++)
1249                if (needs_quote(ch))
1250                        strbuf_addf(&buf, "%%%02x", ch);
1251                else
1252                        strbuf_addch(&buf, *cp);
1253
1254        return strbuf_detach(&buf, NULL);
1255}
1256
1257void append_remote_object_url(struct strbuf *buf, const char *url,
1258                              const char *hex,
1259                              int only_two_digit_prefix)
1260{
1261        end_url_with_slash(buf, url);
1262
1263        strbuf_addf(buf, "objects/%.*s/", 2, hex);
1264        if (!only_two_digit_prefix)
1265                strbuf_addstr(buf, hex + 2);
1266}
1267
1268char *get_remote_object_url(const char *url, const char *hex,
1269                            int only_two_digit_prefix)
1270{
1271        struct strbuf buf = STRBUF_INIT;
1272        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1273        return strbuf_detach(&buf, NULL);
1274}
1275
1276static int handle_curl_result(struct slot_results *results)
1277{
1278        /*
1279         * If we see a failing http code with CURLE_OK, we have turned off
1280         * FAILONERROR (to keep the server's custom error response), and should
1281         * translate the code into failure here.
1282         */
1283        if (results->curl_result == CURLE_OK &&
1284            results->http_code >= 400) {
1285                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1286                /*
1287                 * Normally curl will already have put the "reason phrase"
1288                 * from the server into curl_errorstr; unfortunately without
1289                 * FAILONERROR it is lost, so we can give only the numeric
1290                 * status code.
1291                 */
1292                snprintf(curl_errorstr, sizeof(curl_errorstr),
1293                         "The requested URL returned error: %ld",
1294                         results->http_code);
1295        }
1296
1297        if (results->curl_result == CURLE_OK) {
1298                credential_approve(&http_auth);
1299                if (proxy_auth.password)
1300                        credential_approve(&proxy_auth);
1301                return HTTP_OK;
1302        } else if (missing_target(results))
1303                return HTTP_MISSING_TARGET;
1304        else if (results->http_code == 401) {
1305                if (http_auth.username && http_auth.password) {
1306                        credential_reject(&http_auth);
1307                        return HTTP_NOAUTH;
1308                } else {
1309#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1310                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1311#endif
1312                        return HTTP_REAUTH;
1313                }
1314        } else {
1315                if (results->http_connectcode == 407)
1316                        credential_reject(&proxy_auth);
1317#if LIBCURL_VERSION_NUM >= 0x070c00
1318                if (!curl_errorstr[0])
1319                        strlcpy(curl_errorstr,
1320                                curl_easy_strerror(results->curl_result),
1321                                sizeof(curl_errorstr));
1322#endif
1323                return HTTP_ERROR;
1324        }
1325}
1326
1327int run_one_slot(struct active_request_slot *slot,
1328                 struct slot_results *results)
1329{
1330        slot->results = results;
1331        if (!start_active_slot(slot)) {
1332                snprintf(curl_errorstr, sizeof(curl_errorstr),
1333                         "failed to start HTTP request");
1334                return HTTP_START_FAILED;
1335        }
1336
1337        run_active_slot(slot);
1338        return handle_curl_result(results);
1339}
1340
1341struct curl_slist *http_copy_default_headers(void)
1342{
1343        struct curl_slist *headers = NULL, *h;
1344
1345        for (h = extra_http_headers; h; h = h->next)
1346                headers = curl_slist_append(headers, h->data);
1347
1348        return headers;
1349}
1350
1351static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1352{
1353        char *ptr;
1354        CURLcode ret;
1355
1356        strbuf_reset(buf);
1357        ret = curl_easy_getinfo(curl, info, &ptr);
1358        if (!ret && ptr)
1359                strbuf_addstr(buf, ptr);
1360        return ret;
1361}
1362
1363/*
1364 * Check for and extract a content-type parameter. "raw"
1365 * should be positioned at the start of the potential
1366 * parameter, with any whitespace already removed.
1367 *
1368 * "name" is the name of the parameter. The value is appended
1369 * to "out".
1370 */
1371static int extract_param(const char *raw, const char *name,
1372                         struct strbuf *out)
1373{
1374        size_t len = strlen(name);
1375
1376        if (strncasecmp(raw, name, len))
1377                return -1;
1378        raw += len;
1379
1380        if (*raw != '=')
1381                return -1;
1382        raw++;
1383
1384        while (*raw && !isspace(*raw) && *raw != ';')
1385                strbuf_addch(out, *raw++);
1386        return 0;
1387}
1388
1389/*
1390 * Extract a normalized version of the content type, with any
1391 * spaces suppressed, all letters lowercased, and no trailing ";"
1392 * or parameters.
1393 *
1394 * Note that we will silently remove even invalid whitespace. For
1395 * example, "text / plain" is specifically forbidden by RFC 2616,
1396 * but "text/plain" is the only reasonable output, and this keeps
1397 * our code simple.
1398 *
1399 * If the "charset" argument is not NULL, store the value of any
1400 * charset parameter there.
1401 *
1402 * Example:
1403 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1404 *   "text / plain" -> "text/plain"
1405 */
1406static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1407                                 struct strbuf *charset)
1408{
1409        const char *p;
1410
1411        strbuf_reset(type);
1412        strbuf_grow(type, raw->len);
1413        for (p = raw->buf; *p; p++) {
1414                if (isspace(*p))
1415                        continue;
1416                if (*p == ';') {
1417                        p++;
1418                        break;
1419                }
1420                strbuf_addch(type, tolower(*p));
1421        }
1422
1423        if (!charset)
1424                return;
1425
1426        strbuf_reset(charset);
1427        while (*p) {
1428                while (isspace(*p) || *p == ';')
1429                        p++;
1430                if (!extract_param(p, "charset", charset))
1431                        return;
1432                while (*p && !isspace(*p))
1433                        p++;
1434        }
1435
1436        if (!charset->len && starts_with(type->buf, "text/"))
1437                strbuf_addstr(charset, "ISO-8859-1");
1438}
1439
1440static void write_accept_language(struct strbuf *buf)
1441{
1442        /*
1443         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1444         * that, q-value will be smaller than 0.001, the minimum q-value the
1445         * HTTP specification allows. See
1446         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1447         */
1448        const int MAX_DECIMAL_PLACES = 3;
1449        const int MAX_LANGUAGE_TAGS = 1000;
1450        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1451        char **language_tags = NULL;
1452        int num_langs = 0;
1453        const char *s = get_preferred_languages();
1454        int i;
1455        struct strbuf tag = STRBUF_INIT;
1456
1457        /* Don't add Accept-Language header if no language is preferred. */
1458        if (!s)
1459                return;
1460
1461        /*
1462         * Split the colon-separated string of preferred languages into
1463         * language_tags array.
1464         */
1465        do {
1466                /* collect language tag */
1467                for (; *s && (isalnum(*s) || *s == '_'); s++)
1468                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1469
1470                /* skip .codeset, @modifier and any other unnecessary parts */
1471                while (*s && *s != ':')
1472                        s++;
1473
1474                if (tag.len) {
1475                        num_langs++;
1476                        REALLOC_ARRAY(language_tags, num_langs);
1477                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1478                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1479                                break;
1480                }
1481        } while (*s++);
1482
1483        /* write Accept-Language header into buf */
1484        if (num_langs) {
1485                int last_buf_len = 0;
1486                int max_q;
1487                int decimal_places;
1488                char q_format[32];
1489
1490                /* add '*' */
1491                REALLOC_ARRAY(language_tags, num_langs + 1);
1492                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1493
1494                /* compute decimal_places */
1495                for (max_q = 1, decimal_places = 0;
1496                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1497                     decimal_places++, max_q *= 10)
1498                        ;
1499
1500                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1501
1502                strbuf_addstr(buf, "Accept-Language: ");
1503
1504                for (i = 0; i < num_langs; i++) {
1505                        if (i > 0)
1506                                strbuf_addstr(buf, ", ");
1507
1508                        strbuf_addstr(buf, language_tags[i]);
1509
1510                        if (i > 0)
1511                                strbuf_addf(buf, q_format, max_q - i);
1512
1513                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1514                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1515                                break;
1516                        }
1517
1518                        last_buf_len = buf->len;
1519                }
1520        }
1521
1522        /* free language tags -- last one is a static '*' */
1523        for (i = 0; i < num_langs - 1; i++)
1524                free(language_tags[i]);
1525        free(language_tags);
1526}
1527
1528/*
1529 * Get an Accept-Language header which indicates user's preferred languages.
1530 *
1531 * Examples:
1532 *   LANGUAGE= -> ""
1533 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1534 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1535 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1536 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1537 *   LANGUAGE= LANG=C -> ""
1538 */
1539static const char *get_accept_language(void)
1540{
1541        if (!cached_accept_language) {
1542                struct strbuf buf = STRBUF_INIT;
1543                write_accept_language(&buf);
1544                if (buf.len > 0)
1545                        cached_accept_language = strbuf_detach(&buf, NULL);
1546        }
1547
1548        return cached_accept_language;
1549}
1550
1551static void http_opt_request_remainder(CURL *curl, off_t pos)
1552{
1553        char buf[128];
1554        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1555        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1556}
1557
1558/* http_request() targets */
1559#define HTTP_REQUEST_STRBUF     0
1560#define HTTP_REQUEST_FILE       1
1561
1562static int http_request(const char *url,
1563                        void *result, int target,
1564                        const struct http_get_options *options)
1565{
1566        struct active_request_slot *slot;
1567        struct slot_results results;
1568        struct curl_slist *headers = http_copy_default_headers();
1569        struct strbuf buf = STRBUF_INIT;
1570        const char *accept_language;
1571        int ret;
1572
1573        slot = get_active_slot();
1574        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1575
1576        if (result == NULL) {
1577                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1578        } else {
1579                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1580                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1581
1582                if (target == HTTP_REQUEST_FILE) {
1583                        off_t posn = ftello(result);
1584                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1585                                         fwrite);
1586                        if (posn > 0)
1587                                http_opt_request_remainder(slot->curl, posn);
1588                } else
1589                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1590                                         fwrite_buffer);
1591        }
1592
1593        accept_language = get_accept_language();
1594
1595        if (accept_language)
1596                headers = curl_slist_append(headers, accept_language);
1597
1598        strbuf_addstr(&buf, "Pragma:");
1599        if (options && options->no_cache)
1600                strbuf_addstr(&buf, " no-cache");
1601        if (options && options->keep_error)
1602                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1603
1604        headers = curl_slist_append(headers, buf.buf);
1605
1606        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1607        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1608        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1609
1610        ret = run_one_slot(slot, &results);
1611
1612        if (options && options->content_type) {
1613                struct strbuf raw = STRBUF_INIT;
1614                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1615                extract_content_type(&raw, options->content_type,
1616                                     options->charset);
1617                strbuf_release(&raw);
1618        }
1619
1620        if (options && options->effective_url)
1621                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1622                                options->effective_url);
1623
1624        curl_slist_free_all(headers);
1625        strbuf_release(&buf);
1626
1627        return ret;
1628}
1629
1630/*
1631 * Update the "base" url to a more appropriate value, as deduced by
1632 * redirects seen when requesting a URL starting with "url".
1633 *
1634 * The "asked" parameter is a URL that we asked curl to access, and must begin
1635 * with "base".
1636 *
1637 * The "got" parameter is the URL that curl reported to us as where we ended
1638 * up.
1639 *
1640 * Returns 1 if we updated the base url, 0 otherwise.
1641 *
1642 * Our basic strategy is to compare "base" and "asked" to find the bits
1643 * specific to our request. We then strip those bits off of "got" to yield the
1644 * new base. So for example, if our base is "http://example.com/foo.git",
1645 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1646 * with "https://other.example.com/foo.git/info/refs". We would want the
1647 * new URL to become "https://other.example.com/foo.git".
1648 *
1649 * Note that this assumes a sane redirect scheme. It's entirely possible
1650 * in the example above to end up at a URL that does not even end in
1651 * "info/refs".  In such a case we simply punt, as there is not much we can
1652 * do (and such a scheme is unlikely to represent a real git repository,
1653 * which means we are likely about to abort anyway).
1654 */
1655static int update_url_from_redirect(struct strbuf *base,
1656                                    const char *asked,
1657                                    const struct strbuf *got)
1658{
1659        const char *tail;
1660        size_t tail_len;
1661
1662        if (!strcmp(asked, got->buf))
1663                return 0;
1664
1665        if (!skip_prefix(asked, base->buf, &tail))
1666                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1667                    asked, base->buf);
1668
1669        tail_len = strlen(tail);
1670
1671        if (got->len < tail_len ||
1672            strcmp(tail, got->buf + got->len - tail_len))
1673                return 0; /* insane redirect scheme */
1674
1675        strbuf_reset(base);
1676        strbuf_add(base, got->buf, got->len - tail_len);
1677        return 1;
1678}
1679
1680static int http_request_reauth(const char *url,
1681                               void *result, int target,
1682                               struct http_get_options *options)
1683{
1684        int ret = http_request(url, result, target, options);
1685
1686        if (options && options->effective_url && options->base_url) {
1687                if (update_url_from_redirect(options->base_url,
1688                                             url, options->effective_url)) {
1689                        credential_from_url(&http_auth, options->base_url->buf);
1690                        url = options->effective_url->buf;
1691                }
1692        }
1693
1694        if (ret != HTTP_REAUTH)
1695                return ret;
1696
1697        /*
1698         * If we are using KEEP_ERROR, the previous request may have
1699         * put cruft into our output stream; we should clear it out before
1700         * making our next request. We only know how to do this for
1701         * the strbuf case, but that is enough to satisfy current callers.
1702         */
1703        if (options && options->keep_error) {
1704                switch (target) {
1705                case HTTP_REQUEST_STRBUF:
1706                        strbuf_reset(result);
1707                        break;
1708                default:
1709                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1710                }
1711        }
1712
1713        credential_fill(&http_auth);
1714
1715        return http_request(url, result, target, options);
1716}
1717
1718int http_get_strbuf(const char *url,
1719                    struct strbuf *result,
1720                    struct http_get_options *options)
1721{
1722        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1723}
1724
1725/*
1726 * Downloads a URL and stores the result in the given file.
1727 *
1728 * If a previous interrupted download is detected (i.e. a previous temporary
1729 * file is still around) the download is resumed.
1730 */
1731static int http_get_file(const char *url, const char *filename,
1732                         struct http_get_options *options)
1733{
1734        int ret;
1735        struct strbuf tmpfile = STRBUF_INIT;
1736        FILE *result;
1737
1738        strbuf_addf(&tmpfile, "%s.temp", filename);
1739        result = fopen(tmpfile.buf, "a");
1740        if (!result) {
1741                error("Unable to open local file %s", tmpfile.buf);
1742                ret = HTTP_ERROR;
1743                goto cleanup;
1744        }
1745
1746        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1747        fclose(result);
1748
1749        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1750                ret = HTTP_ERROR;
1751cleanup:
1752        strbuf_release(&tmpfile);
1753        return ret;
1754}
1755
1756int http_fetch_ref(const char *base, struct ref *ref)
1757{
1758        struct http_get_options options = {0};
1759        char *url;
1760        struct strbuf buffer = STRBUF_INIT;
1761        int ret = -1;
1762
1763        options.no_cache = 1;
1764
1765        url = quote_ref_url(base, ref->name);
1766        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1767                strbuf_rtrim(&buffer);
1768                if (buffer.len == 40)
1769                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
1770                else if (starts_with(buffer.buf, "ref: ")) {
1771                        ref->symref = xstrdup(buffer.buf + 5);
1772                        ret = 0;
1773                }
1774        }
1775
1776        strbuf_release(&buffer);
1777        free(url);
1778        return ret;
1779}
1780
1781/* Helpers for fetching packs */
1782static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1783{
1784        char *url, *tmp;
1785        struct strbuf buf = STRBUF_INIT;
1786
1787        if (http_is_verbose)
1788                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1789
1790        end_url_with_slash(&buf, base_url);
1791        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1792        url = strbuf_detach(&buf, NULL);
1793
1794        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1795        tmp = strbuf_detach(&buf, NULL);
1796
1797        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1798                error("Unable to get pack index %s", url);
1799                free(tmp);
1800                tmp = NULL;
1801        }
1802
1803        free(url);
1804        return tmp;
1805}
1806
1807static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1808        unsigned char *sha1, const char *base_url)
1809{
1810        struct packed_git *new_pack;
1811        char *tmp_idx = NULL;
1812        int ret;
1813
1814        if (has_pack_index(sha1)) {
1815                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1816                if (!new_pack)
1817                        return -1; /* parse_pack_index() already issued error message */
1818                goto add_pack;
1819        }
1820
1821        tmp_idx = fetch_pack_index(sha1, base_url);
1822        if (!tmp_idx)
1823                return -1;
1824
1825        new_pack = parse_pack_index(sha1, tmp_idx);
1826        if (!new_pack) {
1827                unlink(tmp_idx);
1828                free(tmp_idx);
1829
1830                return -1; /* parse_pack_index() already issued error message */
1831        }
1832
1833        ret = verify_pack_index(new_pack);
1834        if (!ret) {
1835                close_pack_index(new_pack);
1836                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1837        }
1838        free(tmp_idx);
1839        if (ret)
1840                return -1;
1841
1842add_pack:
1843        new_pack->next = *packs_head;
1844        *packs_head = new_pack;
1845        return 0;
1846}
1847
1848int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1849{
1850        struct http_get_options options = {0};
1851        int ret = 0, i = 0;
1852        char *url, *data;
1853        struct strbuf buf = STRBUF_INIT;
1854        unsigned char sha1[20];
1855
1856        end_url_with_slash(&buf, base_url);
1857        strbuf_addstr(&buf, "objects/info/packs");
1858        url = strbuf_detach(&buf, NULL);
1859
1860        options.no_cache = 1;
1861        ret = http_get_strbuf(url, &buf, &options);
1862        if (ret != HTTP_OK)
1863                goto cleanup;
1864
1865        data = buf.buf;
1866        while (i < buf.len) {
1867                switch (data[i]) {
1868                case 'P':
1869                        i++;
1870                        if (i + 52 <= buf.len &&
1871                            starts_with(data + i, " pack-") &&
1872                            starts_with(data + i + 46, ".pack\n")) {
1873                                get_sha1_hex(data + i + 6, sha1);
1874                                fetch_and_setup_pack_index(packs_head, sha1,
1875                                                      base_url);
1876                                i += 51;
1877                                break;
1878                        }
1879                default:
1880                        while (i < buf.len && data[i] != '\n')
1881                                i++;
1882                }
1883                i++;
1884        }
1885
1886cleanup:
1887        free(url);
1888        return ret;
1889}
1890
1891void release_http_pack_request(struct http_pack_request *preq)
1892{
1893        if (preq->packfile != NULL) {
1894                fclose(preq->packfile);
1895                preq->packfile = NULL;
1896        }
1897        preq->slot = NULL;
1898        free(preq->url);
1899        free(preq);
1900}
1901
1902int finish_http_pack_request(struct http_pack_request *preq)
1903{
1904        struct packed_git **lst;
1905        struct packed_git *p = preq->target;
1906        char *tmp_idx;
1907        size_t len;
1908        struct child_process ip = CHILD_PROCESS_INIT;
1909        const char *ip_argv[8];
1910
1911        close_pack_index(p);
1912
1913        fclose(preq->packfile);
1914        preq->packfile = NULL;
1915
1916        lst = preq->lst;
1917        while (*lst != p)
1918                lst = &((*lst)->next);
1919        *lst = (*lst)->next;
1920
1921        if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1922                die("BUG: pack tmpfile does not end in .pack.temp?");
1923        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1924
1925        ip_argv[0] = "index-pack";
1926        ip_argv[1] = "-o";
1927        ip_argv[2] = tmp_idx;
1928        ip_argv[3] = preq->tmpfile;
1929        ip_argv[4] = NULL;
1930
1931        ip.argv = ip_argv;
1932        ip.git_cmd = 1;
1933        ip.no_stdin = 1;
1934        ip.no_stdout = 1;
1935
1936        if (run_command(&ip)) {
1937                unlink(preq->tmpfile);
1938                unlink(tmp_idx);
1939                free(tmp_idx);
1940                return -1;
1941        }
1942
1943        unlink(sha1_pack_index_name(p->sha1));
1944
1945        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1946         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1947                free(tmp_idx);
1948                return -1;
1949        }
1950
1951        install_packed_git(p);
1952        free(tmp_idx);
1953        return 0;
1954}
1955
1956struct http_pack_request *new_http_pack_request(
1957        struct packed_git *target, const char *base_url)
1958{
1959        off_t prev_posn = 0;
1960        struct strbuf buf = STRBUF_INIT;
1961        struct http_pack_request *preq;
1962
1963        preq = xcalloc(1, sizeof(*preq));
1964        preq->target = target;
1965
1966        end_url_with_slash(&buf, base_url);
1967        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1968                sha1_to_hex(target->sha1));
1969        preq->url = strbuf_detach(&buf, NULL);
1970
1971        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1972                sha1_pack_name(target->sha1));
1973        preq->packfile = fopen(preq->tmpfile, "a");
1974        if (!preq->packfile) {
1975                error("Unable to open local file %s for pack",
1976                      preq->tmpfile);
1977                goto abort;
1978        }
1979
1980        preq->slot = get_active_slot();
1981        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1982        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1983        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1984        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1985                no_pragma_header);
1986
1987        /*
1988         * If there is data present from a previous transfer attempt,
1989         * resume where it left off
1990         */
1991        prev_posn = ftello(preq->packfile);
1992        if (prev_posn>0) {
1993                if (http_is_verbose)
1994                        fprintf(stderr,
1995                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1996                                sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1997                http_opt_request_remainder(preq->slot->curl, prev_posn);
1998        }
1999
2000        return preq;
2001
2002abort:
2003        free(preq->url);
2004        free(preq);
2005        return NULL;
2006}
2007
2008/* Helpers for fetching objects (loose) */
2009static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2010                               void *data)
2011{
2012        unsigned char expn[4096];
2013        size_t size = eltsize * nmemb;
2014        int posn = 0;
2015        struct http_object_request *freq = data;
2016        struct active_request_slot *slot = freq->slot;
2017
2018        if (slot) {
2019                CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2020                                                &slot->http_code);
2021                if (c != CURLE_OK)
2022                        die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2023                                curl_easy_strerror(c));
2024                if (slot->http_code >= 400)
2025                        return size;
2026        }
2027
2028        do {
2029                ssize_t retval = xwrite(freq->localfile,
2030                                        (char *) ptr + posn, size - posn);
2031                if (retval < 0)
2032                        return posn;
2033                posn += retval;
2034        } while (posn < size);
2035
2036        freq->stream.avail_in = size;
2037        freq->stream.next_in = (void *)ptr;
2038        do {
2039                freq->stream.next_out = expn;
2040                freq->stream.avail_out = sizeof(expn);
2041                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2042                git_SHA1_Update(&freq->c, expn,
2043                                sizeof(expn) - freq->stream.avail_out);
2044        } while (freq->stream.avail_in && freq->zret == Z_OK);
2045        return size;
2046}
2047
2048struct http_object_request *new_http_object_request(const char *base_url,
2049        unsigned char *sha1)
2050{
2051        char *hex = sha1_to_hex(sha1);
2052        const char *filename;
2053        char prevfile[PATH_MAX];
2054        int prevlocal;
2055        char prev_buf[PREV_BUF_SIZE];
2056        ssize_t prev_read = 0;
2057        off_t prev_posn = 0;
2058        struct http_object_request *freq;
2059
2060        freq = xcalloc(1, sizeof(*freq));
2061        hashcpy(freq->sha1, sha1);
2062        freq->localfile = -1;
2063
2064        filename = sha1_file_name(sha1);
2065        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2066                 "%s.temp", filename);
2067
2068        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2069        unlink_or_warn(prevfile);
2070        rename(freq->tmpfile, prevfile);
2071        unlink_or_warn(freq->tmpfile);
2072
2073        if (freq->localfile != -1)
2074                error("fd leakage in start: %d", freq->localfile);
2075        freq->localfile = open(freq->tmpfile,
2076                               O_WRONLY | O_CREAT | O_EXCL, 0666);
2077        /*
2078         * This could have failed due to the "lazy directory creation";
2079         * try to mkdir the last path component.
2080         */
2081        if (freq->localfile < 0 && errno == ENOENT) {
2082                char *dir = strrchr(freq->tmpfile, '/');
2083                if (dir) {
2084                        *dir = 0;
2085                        mkdir(freq->tmpfile, 0777);
2086                        *dir = '/';
2087                }
2088                freq->localfile = open(freq->tmpfile,
2089                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
2090        }
2091
2092        if (freq->localfile < 0) {
2093                error_errno("Couldn't create temporary file %s", freq->tmpfile);
2094                goto abort;
2095        }
2096
2097        git_inflate_init(&freq->stream);
2098
2099        git_SHA1_Init(&freq->c);
2100
2101        freq->url = get_remote_object_url(base_url, hex, 0);
2102
2103        /*
2104         * If a previous temp file is present, process what was already
2105         * fetched.
2106         */
2107        prevlocal = open(prevfile, O_RDONLY);
2108        if (prevlocal != -1) {
2109                do {
2110                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2111                        if (prev_read>0) {
2112                                if (fwrite_sha1_file(prev_buf,
2113                                                     1,
2114                                                     prev_read,
2115                                                     freq) == prev_read) {
2116                                        prev_posn += prev_read;
2117                                } else {
2118                                        prev_read = -1;
2119                                }
2120                        }
2121                } while (prev_read > 0);
2122                close(prevlocal);
2123        }
2124        unlink_or_warn(prevfile);
2125
2126        /*
2127         * Reset inflate/SHA1 if there was an error reading the previous temp
2128         * file; also rewind to the beginning of the local file.
2129         */
2130        if (prev_read == -1) {
2131                memset(&freq->stream, 0, sizeof(freq->stream));
2132                git_inflate_init(&freq->stream);
2133                git_SHA1_Init(&freq->c);
2134                if (prev_posn>0) {
2135                        prev_posn = 0;
2136                        lseek(freq->localfile, 0, SEEK_SET);
2137                        if (ftruncate(freq->localfile, 0) < 0) {
2138                                error_errno("Couldn't truncate temporary file %s",
2139                                            freq->tmpfile);
2140                                goto abort;
2141                        }
2142                }
2143        }
2144
2145        freq->slot = get_active_slot();
2146
2147        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2148        curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2149        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2150        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2151        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2152        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2153
2154        /*
2155         * If we have successfully processed data from a previous fetch
2156         * attempt, only fetch the data we don't already have.
2157         */
2158        if (prev_posn>0) {
2159                if (http_is_verbose)
2160                        fprintf(stderr,
2161                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2162                                hex, (uintmax_t)prev_posn);
2163                http_opt_request_remainder(freq->slot->curl, prev_posn);
2164        }
2165
2166        return freq;
2167
2168abort:
2169        free(freq->url);
2170        free(freq);
2171        return NULL;
2172}
2173
2174void process_http_object_request(struct http_object_request *freq)
2175{
2176        if (freq->slot == NULL)
2177                return;
2178        freq->curl_result = freq->slot->curl_result;
2179        freq->http_code = freq->slot->http_code;
2180        freq->slot = NULL;
2181}
2182
2183int finish_http_object_request(struct http_object_request *freq)
2184{
2185        struct stat st;
2186
2187        close(freq->localfile);
2188        freq->localfile = -1;
2189
2190        process_http_object_request(freq);
2191
2192        if (freq->http_code == 416) {
2193                warning("requested range invalid; we may already have all the data.");
2194        } else if (freq->curl_result != CURLE_OK) {
2195                if (stat(freq->tmpfile, &st) == 0)
2196                        if (st.st_size == 0)
2197                                unlink_or_warn(freq->tmpfile);
2198                return -1;
2199        }
2200
2201        git_inflate_end(&freq->stream);
2202        git_SHA1_Final(freq->real_sha1, &freq->c);
2203        if (freq->zret != Z_STREAM_END) {
2204                unlink_or_warn(freq->tmpfile);
2205                return -1;
2206        }
2207        if (hashcmp(freq->sha1, freq->real_sha1)) {
2208                unlink_or_warn(freq->tmpfile);
2209                return -1;
2210        }
2211        freq->rename =
2212                finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2213
2214        return freq->rename;
2215}
2216
2217void abort_http_object_request(struct http_object_request *freq)
2218{
2219        unlink_or_warn(freq->tmpfile);
2220
2221        release_http_object_request(freq);
2222}
2223
2224void release_http_object_request(struct http_object_request *freq)
2225{
2226        if (freq->localfile != -1) {
2227                close(freq->localfile);
2228                freq->localfile = -1;
2229        }
2230        if (freq->url != NULL) {
2231                free(freq->url);
2232                freq->url = NULL;
2233        }
2234        if (freq->slot != NULL) {
2235                freq->slot->callback_func = NULL;
2236                freq->slot->callback_data = NULL;
2237                release_active_slot(freq->slot);
2238                freq->slot = NULL;
2239        }
2240}