Andrew's git / gitweb.git / http.c
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http.con commit Merge branch 'po/fix-doc-merge-base-illustration' into maint (311811b)
   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};
  93static struct credential proxy_auth = CREDENTIAL_INIT;
  94static const char *curl_proxyuserpwd;
  95static const char *curl_cookie_file;
  96static int curl_save_cookies;
  97struct credential http_auth = CREDENTIAL_INIT;
  98static int http_proactive_auth;
  99static const char *user_agent;
 100static int curl_empty_auth;
 101
 102#if LIBCURL_VERSION_NUM >= 0x071700
 103/* Use CURLOPT_KEYPASSWD as is */
 104#elif LIBCURL_VERSION_NUM >= 0x070903
 105#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 106#else
 107#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 108#endif
 109
 110static struct credential cert_auth = CREDENTIAL_INIT;
 111static int ssl_cert_password_required;
 112#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 113static unsigned long http_auth_methods = CURLAUTH_ANY;
 114#endif
 115
 116static struct curl_slist *pragma_header;
 117static struct curl_slist *no_pragma_header;
 118static struct curl_slist *extra_http_headers;
 119
 120static struct active_request_slot *active_queue_head;
 121
 122static char *cached_accept_language;
 123
 124size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 125{
 126        size_t size = eltsize * nmemb;
 127        struct buffer *buffer = buffer_;
 128
 129        if (size > buffer->buf.len - buffer->posn)
 130                size = buffer->buf.len - buffer->posn;
 131        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 132        buffer->posn += size;
 133
 134        return size;
 135}
 136
 137#ifndef NO_CURL_IOCTL
 138curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 139{
 140        struct buffer *buffer = clientp;
 141
 142        switch (cmd) {
 143        case CURLIOCMD_NOP:
 144                return CURLIOE_OK;
 145
 146        case CURLIOCMD_RESTARTREAD:
 147                buffer->posn = 0;
 148                return CURLIOE_OK;
 149
 150        default:
 151                return CURLIOE_UNKNOWNCMD;
 152        }
 153}
 154#endif
 155
 156size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 157{
 158        size_t size = eltsize * nmemb;
 159        struct strbuf *buffer = buffer_;
 160
 161        strbuf_add(buffer, ptr, size);
 162        return size;
 163}
 164
 165size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 166{
 167        return eltsize * nmemb;
 168}
 169
 170static void closedown_active_slot(struct active_request_slot *slot)
 171{
 172        active_requests--;
 173        slot->in_use = 0;
 174}
 175
 176static void finish_active_slot(struct active_request_slot *slot)
 177{
 178        closedown_active_slot(slot);
 179        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 180
 181        if (slot->finished != NULL)
 182                (*slot->finished) = 1;
 183
 184        /* Store slot results so they can be read after the slot is reused */
 185        if (slot->results != NULL) {
 186                slot->results->curl_result = slot->curl_result;
 187                slot->results->http_code = slot->http_code;
 188#if LIBCURL_VERSION_NUM >= 0x070a08
 189                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 190                                  &slot->results->auth_avail);
 191#else
 192                slot->results->auth_avail = 0;
 193#endif
 194
 195                curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 196                        &slot->results->http_connectcode);
 197        }
 198
 199        /* Run callback if appropriate */
 200        if (slot->callback_func != NULL)
 201                slot->callback_func(slot->callback_data);
 202}
 203
 204static void xmulti_remove_handle(struct active_request_slot *slot)
 205{
 206#ifdef USE_CURL_MULTI
 207        curl_multi_remove_handle(curlm, slot->curl);
 208#endif
 209}
 210
 211#ifdef USE_CURL_MULTI
 212static void process_curl_messages(void)
 213{
 214        int num_messages;
 215        struct active_request_slot *slot;
 216        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 217
 218        while (curl_message != NULL) {
 219                if (curl_message->msg == CURLMSG_DONE) {
 220                        int curl_result = curl_message->data.result;
 221                        slot = active_queue_head;
 222                        while (slot != NULL &&
 223                               slot->curl != curl_message->easy_handle)
 224                                slot = slot->next;
 225                        if (slot != NULL) {
 226                                xmulti_remove_handle(slot);
 227                                slot->curl_result = curl_result;
 228                                finish_active_slot(slot);
 229                        } else {
 230                                fprintf(stderr, "Received DONE message for unknown request!\n");
 231                        }
 232                } else {
 233                        fprintf(stderr, "Unknown CURL message received: %d\n",
 234                                (int)curl_message->msg);
 235                }
 236                curl_message = curl_multi_info_read(curlm, &num_messages);
 237        }
 238}
 239#endif
 240
 241static int http_options(const char *var, const char *value, void *cb)
 242{
 243        if (!strcmp("http.sslverify", var)) {
 244                curl_ssl_verify = git_config_bool(var, value);
 245                return 0;
 246        }
 247        if (!strcmp("http.sslcipherlist", var))
 248                return git_config_string(&ssl_cipherlist, var, value);
 249        if (!strcmp("http.sslversion", var))
 250                return git_config_string(&ssl_version, var, value);
 251        if (!strcmp("http.sslcert", var))
 252                return git_config_string(&ssl_cert, var, value);
 253#if LIBCURL_VERSION_NUM >= 0x070903
 254        if (!strcmp("http.sslkey", var))
 255                return git_config_string(&ssl_key, var, value);
 256#endif
 257#if LIBCURL_VERSION_NUM >= 0x070908
 258        if (!strcmp("http.sslcapath", var))
 259                return git_config_pathname(&ssl_capath, var, value);
 260#endif
 261        if (!strcmp("http.sslcainfo", var))
 262                return git_config_pathname(&ssl_cainfo, var, value);
 263        if (!strcmp("http.sslcertpasswordprotected", var)) {
 264                ssl_cert_password_required = git_config_bool(var, value);
 265                return 0;
 266        }
 267        if (!strcmp("http.ssltry", var)) {
 268                curl_ssl_try = git_config_bool(var, value);
 269                return 0;
 270        }
 271        if (!strcmp("http.minsessions", var)) {
 272                min_curl_sessions = git_config_int(var, value);
 273#ifndef USE_CURL_MULTI
 274                if (min_curl_sessions > 1)
 275                        min_curl_sessions = 1;
 276#endif
 277                return 0;
 278        }
 279#ifdef USE_CURL_MULTI
 280        if (!strcmp("http.maxrequests", var)) {
 281                max_requests = git_config_int(var, value);
 282                return 0;
 283        }
 284#endif
 285        if (!strcmp("http.lowspeedlimit", var)) {
 286                curl_low_speed_limit = (long)git_config_int(var, value);
 287                return 0;
 288        }
 289        if (!strcmp("http.lowspeedtime", var)) {
 290                curl_low_speed_time = (long)git_config_int(var, value);
 291                return 0;
 292        }
 293
 294        if (!strcmp("http.noepsv", var)) {
 295                curl_ftp_no_epsv = git_config_bool(var, value);
 296                return 0;
 297        }
 298        if (!strcmp("http.proxy", var))
 299                return git_config_string(&curl_http_proxy, var, value);
 300
 301        if (!strcmp("http.proxyauthmethod", var))
 302                return git_config_string(&http_proxy_authmethod, var, value);
 303
 304        if (!strcmp("http.cookiefile", var))
 305                return git_config_pathname(&curl_cookie_file, var, value);
 306        if (!strcmp("http.savecookies", var)) {
 307                curl_save_cookies = git_config_bool(var, value);
 308                return 0;
 309        }
 310
 311        if (!strcmp("http.postbuffer", var)) {
 312                http_post_buffer = git_config_int(var, value);
 313                if (http_post_buffer < LARGE_PACKET_MAX)
 314                        http_post_buffer = LARGE_PACKET_MAX;
 315                return 0;
 316        }
 317
 318        if (!strcmp("http.useragent", var))
 319                return git_config_string(&user_agent, var, value);
 320
 321        if (!strcmp("http.emptyauth", var)) {
 322                curl_empty_auth = git_config_bool(var, value);
 323                return 0;
 324        }
 325
 326        if (!strcmp("http.pinnedpubkey", var)) {
 327#if LIBCURL_VERSION_NUM >= 0x072c00
 328                return git_config_pathname(&ssl_pinnedkey, var, value);
 329#else
 330                warning(_("Public key pinning not supported with cURL < 7.44.0"));
 331                return 0;
 332#endif
 333        }
 334
 335        if (!strcmp("http.extraheader", var)) {
 336                if (!value) {
 337                        return config_error_nonbool(var);
 338                } else if (!*value) {
 339                        curl_slist_free_all(extra_http_headers);
 340                        extra_http_headers = NULL;
 341                } else {
 342                        extra_http_headers =
 343                                curl_slist_append(extra_http_headers, value);
 344                }
 345                return 0;
 346        }
 347
 348        /* Fall back on the default ones */
 349        return git_default_config(var, value, cb);
 350}
 351
 352static void init_curl_http_auth(CURL *result)
 353{
 354        if (!http_auth.username || !*http_auth.username) {
 355                if (curl_empty_auth)
 356                        curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 357                return;
 358        }
 359
 360        credential_fill(&http_auth);
 361
 362#if LIBCURL_VERSION_NUM >= 0x071301
 363        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 364        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 365#else
 366        {
 367                static struct strbuf up = STRBUF_INIT;
 368                /*
 369                 * Note that we assume we only ever have a single set of
 370                 * credentials in a given program run, so we do not have
 371                 * to worry about updating this buffer, only setting its
 372                 * initial value.
 373                 */
 374                if (!up.len)
 375                        strbuf_addf(&up, "%s:%s",
 376                                http_auth.username, http_auth.password);
 377                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 378        }
 379#endif
 380}
 381
 382/* *var must be free-able */
 383static void var_override(const char **var, char *value)
 384{
 385        if (value) {
 386                free((void *)*var);
 387                *var = xstrdup(value);
 388        }
 389}
 390
 391static void set_proxyauth_name_password(CURL *result)
 392{
 393#if LIBCURL_VERSION_NUM >= 0x071301
 394                curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 395                        proxy_auth.username);
 396                curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 397                        proxy_auth.password);
 398#else
 399                struct strbuf s = STRBUF_INIT;
 400
 401                strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 402                strbuf_addch(&s, ':');
 403                strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 404                curl_proxyuserpwd = strbuf_detach(&s, NULL);
 405                curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 406#endif
 407}
 408
 409static void init_curl_proxy_auth(CURL *result)
 410{
 411        if (proxy_auth.username) {
 412                if (!proxy_auth.password)
 413                        credential_fill(&proxy_auth);
 414                set_proxyauth_name_password(result);
 415        }
 416
 417        var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 418
 419#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 420        if (http_proxy_authmethod) {
 421                int i;
 422                for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 423                        if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 424                                curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 425                                                proxy_authmethods[i].curlauth_param);
 426                                break;
 427                        }
 428                }
 429                if (i == ARRAY_SIZE(proxy_authmethods)) {
 430                        warning("unsupported proxy authentication method %s: using anyauth",
 431                                        http_proxy_authmethod);
 432                        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 433                }
 434        }
 435        else
 436                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 437#endif
 438}
 439
 440static int has_cert_password(void)
 441{
 442        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 443                return 0;
 444        if (!cert_auth.password) {
 445                cert_auth.protocol = xstrdup("cert");
 446                cert_auth.username = xstrdup("");
 447                cert_auth.path = xstrdup(ssl_cert);
 448                credential_fill(&cert_auth);
 449        }
 450        return 1;
 451}
 452
 453#if LIBCURL_VERSION_NUM >= 0x071900
 454static void set_curl_keepalive(CURL *c)
 455{
 456        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 457}
 458
 459#elif LIBCURL_VERSION_NUM >= 0x071000
 460static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 461{
 462        int ka = 1;
 463        int rc;
 464        socklen_t len = (socklen_t)sizeof(ka);
 465
 466        if (type != CURLSOCKTYPE_IPCXN)
 467                return 0;
 468
 469        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 470        if (rc < 0)
 471                warning_errno("unable to set SO_KEEPALIVE on socket");
 472
 473        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 474}
 475
 476static void set_curl_keepalive(CURL *c)
 477{
 478        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 479}
 480
 481#else
 482static void set_curl_keepalive(CURL *c)
 483{
 484        /* not supported on older curl versions */
 485}
 486#endif
 487
 488static void redact_sensitive_header(struct strbuf *header)
 489{
 490        const char *sensitive_header;
 491
 492        if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 493            skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 494                /* The first token is the type, which is OK to log */
 495                while (isspace(*sensitive_header))
 496                        sensitive_header++;
 497                while (*sensitive_header && !isspace(*sensitive_header))
 498                        sensitive_header++;
 499                /* Everything else is opaque and possibly sensitive */
 500                strbuf_setlen(header,  sensitive_header - header->buf);
 501                strbuf_addstr(header, " <redacted>");
 502        }
 503}
 504
 505static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 506{
 507        struct strbuf out = STRBUF_INIT;
 508        struct strbuf **headers, **header;
 509
 510        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 511                text, (long)size, (long)size);
 512        trace_strbuf(&trace_curl, &out);
 513        strbuf_reset(&out);
 514        strbuf_add(&out, ptr, size);
 515        headers = strbuf_split_max(&out, '\n', 0);
 516
 517        for (header = headers; *header; header++) {
 518                if (hide_sensitive_header)
 519                        redact_sensitive_header(*header);
 520                strbuf_insert((*header), 0, text, strlen(text));
 521                strbuf_insert((*header), strlen(text), ": ", 2);
 522                strbuf_rtrim((*header));
 523                strbuf_addch((*header), '\n');
 524                trace_strbuf(&trace_curl, (*header));
 525        }
 526        strbuf_list_free(headers);
 527        strbuf_release(&out);
 528}
 529
 530static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 531{
 532        size_t i;
 533        struct strbuf out = STRBUF_INIT;
 534        unsigned int width = 60;
 535
 536        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 537                text, (long)size, (long)size);
 538        trace_strbuf(&trace_curl, &out);
 539
 540        for (i = 0; i < size; i += width) {
 541                size_t w;
 542
 543                strbuf_reset(&out);
 544                strbuf_addf(&out, "%s: ", text);
 545                for (w = 0; (w < width) && (i + w < size); w++) {
 546                        unsigned char ch = ptr[i + w];
 547
 548                        strbuf_addch(&out,
 549                                       (ch >= 0x20) && (ch < 0x80)
 550                                       ? ch : '.');
 551                }
 552                strbuf_addch(&out, '\n');
 553                trace_strbuf(&trace_curl, &out);
 554        }
 555        strbuf_release(&out);
 556}
 557
 558static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 559{
 560        const char *text;
 561        enum { NO_FILTER = 0, DO_FILTER = 1 };
 562
 563        switch (type) {
 564        case CURLINFO_TEXT:
 565                trace_printf_key(&trace_curl, "== Info: %s", data);
 566        default:                /* we ignore unknown types by default */
 567                return 0;
 568
 569        case CURLINFO_HEADER_OUT:
 570                text = "=> Send header";
 571                curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 572                break;
 573        case CURLINFO_DATA_OUT:
 574                text = "=> Send data";
 575                curl_dump_data(text, (unsigned char *)data, size);
 576                break;
 577        case CURLINFO_SSL_DATA_OUT:
 578                text = "=> Send SSL data";
 579                curl_dump_data(text, (unsigned char *)data, size);
 580                break;
 581        case CURLINFO_HEADER_IN:
 582                text = "<= Recv header";
 583                curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 584                break;
 585        case CURLINFO_DATA_IN:
 586                text = "<= Recv data";
 587                curl_dump_data(text, (unsigned char *)data, size);
 588                break;
 589        case CURLINFO_SSL_DATA_IN:
 590                text = "<= Recv SSL data";
 591                curl_dump_data(text, (unsigned char *)data, size);
 592                break;
 593        }
 594        return 0;
 595}
 596
 597void setup_curl_trace(CURL *handle)
 598{
 599        if (!trace_want(&trace_curl))
 600                return;
 601        curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 602        curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 603        curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 604}
 605
 606
 607static CURL *get_curl_handle(void)
 608{
 609        CURL *result = curl_easy_init();
 610        long allowed_protocols = 0;
 611
 612        if (!result)
 613                die("curl_easy_init failed");
 614
 615        if (!curl_ssl_verify) {
 616                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 617                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 618        } else {
 619                /* Verify authenticity of the peer's certificate */
 620                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 621                /* The name in the cert must match whom we tried to connect */
 622                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 623        }
 624
 625#if LIBCURL_VERSION_NUM >= 0x070907
 626        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 627#endif
 628#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 629        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 630#endif
 631
 632        if (http_proactive_auth)
 633                init_curl_http_auth(result);
 634
 635        if (getenv("GIT_SSL_VERSION"))
 636                ssl_version = getenv("GIT_SSL_VERSION");
 637        if (ssl_version && *ssl_version) {
 638                int i;
 639                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 640                        if (!strcmp(ssl_version, sslversions[i].name)) {
 641                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 642                                                 sslversions[i].ssl_version);
 643                                break;
 644                        }
 645                }
 646                if (i == ARRAY_SIZE(sslversions))
 647                        warning("unsupported ssl version %s: using default",
 648                                ssl_version);
 649        }
 650
 651        if (getenv("GIT_SSL_CIPHER_LIST"))
 652                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 653        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 654                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 655                                ssl_cipherlist);
 656
 657        if (ssl_cert != NULL)
 658                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 659        if (has_cert_password())
 660                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 661#if LIBCURL_VERSION_NUM >= 0x070903
 662        if (ssl_key != NULL)
 663                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 664#endif
 665#if LIBCURL_VERSION_NUM >= 0x070908
 666        if (ssl_capath != NULL)
 667                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 668#endif
 669#if LIBCURL_VERSION_NUM >= 0x072c00
 670        if (ssl_pinnedkey != NULL)
 671                curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 672#endif
 673        if (ssl_cainfo != NULL)
 674                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 675
 676        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 677                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 678                                 curl_low_speed_limit);
 679                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 680                                 curl_low_speed_time);
 681        }
 682
 683        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 684        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 685#if LIBCURL_VERSION_NUM >= 0x071301
 686        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 687#elif LIBCURL_VERSION_NUM >= 0x071101
 688        curl_easy_setopt(result, CURLOPT_POST301, 1);
 689#endif
 690#if LIBCURL_VERSION_NUM >= 0x071304
 691        if (is_transport_allowed("http"))
 692                allowed_protocols |= CURLPROTO_HTTP;
 693        if (is_transport_allowed("https"))
 694                allowed_protocols |= CURLPROTO_HTTPS;
 695        if (is_transport_allowed("ftp"))
 696                allowed_protocols |= CURLPROTO_FTP;
 697        if (is_transport_allowed("ftps"))
 698                allowed_protocols |= CURLPROTO_FTPS;
 699        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 700#else
 701        if (transport_restrict_protocols())
 702                warning("protocol restrictions not applied to curl redirects because\n"
 703                        "your curl version is too old (>= 7.19.4)");
 704#endif
 705        if (getenv("GIT_CURL_VERBOSE"))
 706                curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
 707        setup_curl_trace(result);
 708
 709        curl_easy_setopt(result, CURLOPT_USERAGENT,
 710                user_agent ? user_agent : git_user_agent());
 711
 712        if (curl_ftp_no_epsv)
 713                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 714
 715#ifdef CURLOPT_USE_SSL
 716        if (curl_ssl_try)
 717                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 718#endif
 719
 720        /*
 721         * CURL also examines these variables as a fallback; but we need to query
 722         * them here in order to decide whether to prompt for missing password (cf.
 723         * init_curl_proxy_auth()).
 724         *
 725         * Unlike many other common environment variables, these are historically
 726         * lowercase only. It appears that CURL did not know this and implemented
 727         * only uppercase variants, which was later corrected to take both - with
 728         * the exception of http_proxy, which is lowercase only also in CURL. As
 729         * the lowercase versions are the historical quasi-standard, they take
 730         * precedence here, as in CURL.
 731         */
 732        if (!curl_http_proxy) {
 733                if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
 734                        var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 735                        var_override(&curl_http_proxy, getenv("https_proxy"));
 736                } else {
 737                        var_override(&curl_http_proxy, getenv("http_proxy"));
 738                }
 739                if (!curl_http_proxy) {
 740                        var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 741                        var_override(&curl_http_proxy, getenv("all_proxy"));
 742                }
 743        }
 744
 745        if (curl_http_proxy) {
 746                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 747#if LIBCURL_VERSION_NUM >= 0x071800
 748                if (starts_with(curl_http_proxy, "socks5h"))
 749                        curl_easy_setopt(result,
 750                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
 751                else if (starts_with(curl_http_proxy, "socks5"))
 752                        curl_easy_setopt(result,
 753                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 754                else if (starts_with(curl_http_proxy, "socks4a"))
 755                        curl_easy_setopt(result,
 756                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 757                else if (starts_with(curl_http_proxy, "socks"))
 758                        curl_easy_setopt(result,
 759                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 760#endif
 761                if (strstr(curl_http_proxy, "://"))
 762                        credential_from_url(&proxy_auth, curl_http_proxy);
 763                else {
 764                        struct strbuf url = STRBUF_INIT;
 765                        strbuf_addf(&url, "http://%s", curl_http_proxy);
 766                        credential_from_url(&proxy_auth, url.buf);
 767                        strbuf_release(&url);
 768                }
 769
 770                curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 771#if LIBCURL_VERSION_NUM >= 0x071304
 772                var_override(&curl_no_proxy, getenv("NO_PROXY"));
 773                var_override(&curl_no_proxy, getenv("no_proxy"));
 774                curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 775#endif
 776        }
 777        init_curl_proxy_auth(result);
 778
 779        set_curl_keepalive(result);
 780
 781        return result;
 782}
 783
 784static void set_from_env(const char **var, const char *envname)
 785{
 786        const char *val = getenv(envname);
 787        if (val)
 788                *var = val;
 789}
 790
 791void http_init(struct remote *remote, const char *url, int proactive_auth)
 792{
 793        char *low_speed_limit;
 794        char *low_speed_time;
 795        char *normalized_url;
 796        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 797
 798        config.section = "http";
 799        config.key = NULL;
 800        config.collect_fn = http_options;
 801        config.cascade_fn = git_default_config;
 802        config.cb = NULL;
 803
 804        http_is_verbose = 0;
 805        normalized_url = url_normalize(url, &config.url);
 806
 807        git_config(urlmatch_config_entry, &config);
 808        free(normalized_url);
 809
 810        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 811                die("curl_global_init failed");
 812
 813        http_proactive_auth = proactive_auth;
 814
 815        if (remote && remote->http_proxy)
 816                curl_http_proxy = xstrdup(remote->http_proxy);
 817
 818        if (remote)
 819                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 820
 821        pragma_header = curl_slist_append(http_copy_default_headers(),
 822                "Pragma: no-cache");
 823        no_pragma_header = curl_slist_append(http_copy_default_headers(),
 824                "Pragma:");
 825
 826#ifdef USE_CURL_MULTI
 827        {
 828                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 829                if (http_max_requests != NULL)
 830                        max_requests = atoi(http_max_requests);
 831        }
 832
 833        curlm = curl_multi_init();
 834        if (!curlm)
 835                die("curl_multi_init failed");
 836#endif
 837
 838        if (getenv("GIT_SSL_NO_VERIFY"))
 839                curl_ssl_verify = 0;
 840
 841        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 842#if LIBCURL_VERSION_NUM >= 0x070903
 843        set_from_env(&ssl_key, "GIT_SSL_KEY");
 844#endif
 845#if LIBCURL_VERSION_NUM >= 0x070908
 846        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 847#endif
 848        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 849
 850        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 851
 852        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 853        if (low_speed_limit != NULL)
 854                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 855        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 856        if (low_speed_time != NULL)
 857                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 858
 859        if (curl_ssl_verify == -1)
 860                curl_ssl_verify = 1;
 861
 862        curl_session_count = 0;
 863#ifdef USE_CURL_MULTI
 864        if (max_requests < 1)
 865                max_requests = DEFAULT_MAX_REQUESTS;
 866#endif
 867
 868        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 869                curl_ftp_no_epsv = 1;
 870
 871        if (url) {
 872                credential_from_url(&http_auth, url);
 873                if (!ssl_cert_password_required &&
 874                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 875                    starts_with(url, "https://"))
 876                        ssl_cert_password_required = 1;
 877        }
 878
 879#ifndef NO_CURL_EASY_DUPHANDLE
 880        curl_default = get_curl_handle();
 881#endif
 882}
 883
 884void http_cleanup(void)
 885{
 886        struct active_request_slot *slot = active_queue_head;
 887
 888        while (slot != NULL) {
 889                struct active_request_slot *next = slot->next;
 890                if (slot->curl != NULL) {
 891                        xmulti_remove_handle(slot);
 892                        curl_easy_cleanup(slot->curl);
 893                }
 894                free(slot);
 895                slot = next;
 896        }
 897        active_queue_head = NULL;
 898
 899#ifndef NO_CURL_EASY_DUPHANDLE
 900        curl_easy_cleanup(curl_default);
 901#endif
 902
 903#ifdef USE_CURL_MULTI
 904        curl_multi_cleanup(curlm);
 905#endif
 906        curl_global_cleanup();
 907
 908        curl_slist_free_all(extra_http_headers);
 909        extra_http_headers = NULL;
 910
 911        curl_slist_free_all(pragma_header);
 912        pragma_header = NULL;
 913
 914        curl_slist_free_all(no_pragma_header);
 915        no_pragma_header = NULL;
 916
 917        if (curl_http_proxy) {
 918                free((void *)curl_http_proxy);
 919                curl_http_proxy = NULL;
 920        }
 921
 922        if (proxy_auth.password) {
 923                memset(proxy_auth.password, 0, strlen(proxy_auth.password));
 924                free(proxy_auth.password);
 925                proxy_auth.password = NULL;
 926        }
 927
 928        free((void *)curl_proxyuserpwd);
 929        curl_proxyuserpwd = NULL;
 930
 931        free((void *)http_proxy_authmethod);
 932        http_proxy_authmethod = NULL;
 933
 934        if (cert_auth.password != NULL) {
 935                memset(cert_auth.password, 0, strlen(cert_auth.password));
 936                free(cert_auth.password);
 937                cert_auth.password = NULL;
 938        }
 939        ssl_cert_password_required = 0;
 940
 941        free(cached_accept_language);
 942        cached_accept_language = NULL;
 943}
 944
 945struct active_request_slot *get_active_slot(void)
 946{
 947        struct active_request_slot *slot = active_queue_head;
 948        struct active_request_slot *newslot;
 949
 950#ifdef USE_CURL_MULTI
 951        int num_transfers;
 952
 953        /* Wait for a slot to open up if the queue is full */
 954        while (active_requests >= max_requests) {
 955                curl_multi_perform(curlm, &num_transfers);
 956                if (num_transfers < active_requests)
 957                        process_curl_messages();
 958        }
 959#endif
 960
 961        while (slot != NULL && slot->in_use)
 962                slot = slot->next;
 963
 964        if (slot == NULL) {
 965                newslot = xmalloc(sizeof(*newslot));
 966                newslot->curl = NULL;
 967                newslot->in_use = 0;
 968                newslot->next = NULL;
 969
 970                slot = active_queue_head;
 971                if (slot == NULL) {
 972                        active_queue_head = newslot;
 973                } else {
 974                        while (slot->next != NULL)
 975                                slot = slot->next;
 976                        slot->next = newslot;
 977                }
 978                slot = newslot;
 979        }
 980
 981        if (slot->curl == NULL) {
 982#ifdef NO_CURL_EASY_DUPHANDLE
 983                slot->curl = get_curl_handle();
 984#else
 985                slot->curl = curl_easy_duphandle(curl_default);
 986#endif
 987                curl_session_count++;
 988        }
 989
 990        active_requests++;
 991        slot->in_use = 1;
 992        slot->results = NULL;
 993        slot->finished = NULL;
 994        slot->callback_data = NULL;
 995        slot->callback_func = NULL;
 996        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 997        if (curl_save_cookies)
 998                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 999        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1000        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1001        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1002        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1003        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1004        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1005        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1006        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1007        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1008        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1009
1010#if LIBCURL_VERSION_NUM >= 0x070a08
1011        curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1012#endif
1013#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1014        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1015#endif
1016        if (http_auth.password || curl_empty_auth)
1017                init_curl_http_auth(slot->curl);
1018
1019        return slot;
1020}
1021
1022int start_active_slot(struct active_request_slot *slot)
1023{
1024#ifdef USE_CURL_MULTI
1025        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1026        int num_transfers;
1027
1028        if (curlm_result != CURLM_OK &&
1029            curlm_result != CURLM_CALL_MULTI_PERFORM) {
1030                warning("curl_multi_add_handle failed: %s",
1031                        curl_multi_strerror(curlm_result));
1032                active_requests--;
1033                slot->in_use = 0;
1034                return 0;
1035        }
1036
1037        /*
1038         * We know there must be something to do, since we just added
1039         * something.
1040         */
1041        curl_multi_perform(curlm, &num_transfers);
1042#endif
1043        return 1;
1044}
1045
1046#ifdef USE_CURL_MULTI
1047struct fill_chain {
1048        void *data;
1049        int (*fill)(void *);
1050        struct fill_chain *next;
1051};
1052
1053static struct fill_chain *fill_cfg;
1054
1055void add_fill_function(void *data, int (*fill)(void *))
1056{
1057        struct fill_chain *new = xmalloc(sizeof(*new));
1058        struct fill_chain **linkp = &fill_cfg;
1059        new->data = data;
1060        new->fill = fill;
1061        new->next = NULL;
1062        while (*linkp)
1063                linkp = &(*linkp)->next;
1064        *linkp = new;
1065}
1066
1067void fill_active_slots(void)
1068{
1069        struct active_request_slot *slot = active_queue_head;
1070
1071        while (active_requests < max_requests) {
1072                struct fill_chain *fill;
1073                for (fill = fill_cfg; fill; fill = fill->next)
1074                        if (fill->fill(fill->data))
1075                                break;
1076
1077                if (!fill)
1078                        break;
1079        }
1080
1081        while (slot != NULL) {
1082                if (!slot->in_use && slot->curl != NULL
1083                        && curl_session_count > min_curl_sessions) {
1084                        curl_easy_cleanup(slot->curl);
1085                        slot->curl = NULL;
1086                        curl_session_count--;
1087                }
1088                slot = slot->next;
1089        }
1090}
1091
1092void step_active_slots(void)
1093{
1094        int num_transfers;
1095        CURLMcode curlm_result;
1096
1097        do {
1098                curlm_result = curl_multi_perform(curlm, &num_transfers);
1099        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1100        if (num_transfers < active_requests) {
1101                process_curl_messages();
1102                fill_active_slots();
1103        }
1104}
1105#endif
1106
1107void run_active_slot(struct active_request_slot *slot)
1108{
1109#ifdef USE_CURL_MULTI
1110        fd_set readfds;
1111        fd_set writefds;
1112        fd_set excfds;
1113        int max_fd;
1114        struct timeval select_timeout;
1115        int finished = 0;
1116
1117        slot->finished = &finished;
1118        while (!finished) {
1119                step_active_slots();
1120
1121                if (slot->in_use) {
1122#if LIBCURL_VERSION_NUM >= 0x070f04
1123                        long curl_timeout;
1124                        curl_multi_timeout(curlm, &curl_timeout);
1125                        if (curl_timeout == 0) {
1126                                continue;
1127                        } else if (curl_timeout == -1) {
1128                                select_timeout.tv_sec  = 0;
1129                                select_timeout.tv_usec = 50000;
1130                        } else {
1131                                select_timeout.tv_sec  =  curl_timeout / 1000;
1132                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1133                        }
1134#else
1135                        select_timeout.tv_sec  = 0;
1136                        select_timeout.tv_usec = 50000;
1137#endif
1138
1139                        max_fd = -1;
1140                        FD_ZERO(&readfds);
1141                        FD_ZERO(&writefds);
1142                        FD_ZERO(&excfds);
1143                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1144
1145                        /*
1146                         * It can happen that curl_multi_timeout returns a pathologically
1147                         * long timeout when curl_multi_fdset returns no file descriptors
1148                         * to read.  See commit message for more details.
1149                         */
1150                        if (max_fd < 0 &&
1151                            (select_timeout.tv_sec > 0 ||
1152                             select_timeout.tv_usec > 50000)) {
1153                                select_timeout.tv_sec  = 0;
1154                                select_timeout.tv_usec = 50000;
1155                        }
1156
1157                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1158                }
1159        }
1160#else
1161        while (slot->in_use) {
1162                slot->curl_result = curl_easy_perform(slot->curl);
1163                finish_active_slot(slot);
1164        }
1165#endif
1166}
1167
1168static void release_active_slot(struct active_request_slot *slot)
1169{
1170        closedown_active_slot(slot);
1171        if (slot->curl) {
1172                xmulti_remove_handle(slot);
1173                if (curl_session_count > min_curl_sessions) {
1174                        curl_easy_cleanup(slot->curl);
1175                        slot->curl = NULL;
1176                        curl_session_count--;
1177                }
1178        }
1179#ifdef USE_CURL_MULTI
1180        fill_active_slots();
1181#endif
1182}
1183
1184void finish_all_active_slots(void)
1185{
1186        struct active_request_slot *slot = active_queue_head;
1187
1188        while (slot != NULL)
1189                if (slot->in_use) {
1190                        run_active_slot(slot);
1191                        slot = active_queue_head;
1192                } else {
1193                        slot = slot->next;
1194                }
1195}
1196
1197/* Helpers for modifying and creating URLs */
1198static inline int needs_quote(int ch)
1199{
1200        if (((ch >= 'A') && (ch <= 'Z'))
1201                        || ((ch >= 'a') && (ch <= 'z'))
1202                        || ((ch >= '0') && (ch <= '9'))
1203                        || (ch == '/')
1204                        || (ch == '-')
1205                        || (ch == '.'))
1206                return 0;
1207        return 1;
1208}
1209
1210static char *quote_ref_url(const char *base, const char *ref)
1211{
1212        struct strbuf buf = STRBUF_INIT;
1213        const char *cp;
1214        int ch;
1215
1216        end_url_with_slash(&buf, base);
1217
1218        for (cp = ref; (ch = *cp) != 0; cp++)
1219                if (needs_quote(ch))
1220                        strbuf_addf(&buf, "%%%02x", ch);
1221                else
1222                        strbuf_addch(&buf, *cp);
1223
1224        return strbuf_detach(&buf, NULL);
1225}
1226
1227void append_remote_object_url(struct strbuf *buf, const char *url,
1228                              const char *hex,
1229                              int only_two_digit_prefix)
1230{
1231        end_url_with_slash(buf, url);
1232
1233        strbuf_addf(buf, "objects/%.*s/", 2, hex);
1234        if (!only_two_digit_prefix)
1235                strbuf_addstr(buf, hex + 2);
1236}
1237
1238char *get_remote_object_url(const char *url, const char *hex,
1239                            int only_two_digit_prefix)
1240{
1241        struct strbuf buf = STRBUF_INIT;
1242        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1243        return strbuf_detach(&buf, NULL);
1244}
1245
1246static int handle_curl_result(struct slot_results *results)
1247{
1248        /*
1249         * If we see a failing http code with CURLE_OK, we have turned off
1250         * FAILONERROR (to keep the server's custom error response), and should
1251         * translate the code into failure here.
1252         */
1253        if (results->curl_result == CURLE_OK &&
1254            results->http_code >= 400) {
1255                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1256                /*
1257                 * Normally curl will already have put the "reason phrase"
1258                 * from the server into curl_errorstr; unfortunately without
1259                 * FAILONERROR it is lost, so we can give only the numeric
1260                 * status code.
1261                 */
1262                snprintf(curl_errorstr, sizeof(curl_errorstr),
1263                         "The requested URL returned error: %ld",
1264                         results->http_code);
1265        }
1266
1267        if (results->curl_result == CURLE_OK) {
1268                credential_approve(&http_auth);
1269                if (proxy_auth.password)
1270                        credential_approve(&proxy_auth);
1271                return HTTP_OK;
1272        } else if (missing_target(results))
1273                return HTTP_MISSING_TARGET;
1274        else if (results->http_code == 401) {
1275                if (http_auth.username && http_auth.password) {
1276                        credential_reject(&http_auth);
1277                        return HTTP_NOAUTH;
1278                } else {
1279#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1280                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1281#endif
1282                        return HTTP_REAUTH;
1283                }
1284        } else {
1285                if (results->http_connectcode == 407)
1286                        credential_reject(&proxy_auth);
1287#if LIBCURL_VERSION_NUM >= 0x070c00
1288                if (!curl_errorstr[0])
1289                        strlcpy(curl_errorstr,
1290                                curl_easy_strerror(results->curl_result),
1291                                sizeof(curl_errorstr));
1292#endif
1293                return HTTP_ERROR;
1294        }
1295}
1296
1297int run_one_slot(struct active_request_slot *slot,
1298                 struct slot_results *results)
1299{
1300        slot->results = results;
1301        if (!start_active_slot(slot)) {
1302                snprintf(curl_errorstr, sizeof(curl_errorstr),
1303                         "failed to start HTTP request");
1304                return HTTP_START_FAILED;
1305        }
1306
1307        run_active_slot(slot);
1308        return handle_curl_result(results);
1309}
1310
1311struct curl_slist *http_copy_default_headers(void)
1312{
1313        struct curl_slist *headers = NULL, *h;
1314
1315        for (h = extra_http_headers; h; h = h->next)
1316                headers = curl_slist_append(headers, h->data);
1317
1318        return headers;
1319}
1320
1321static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1322{
1323        char *ptr;
1324        CURLcode ret;
1325
1326        strbuf_reset(buf);
1327        ret = curl_easy_getinfo(curl, info, &ptr);
1328        if (!ret && ptr)
1329                strbuf_addstr(buf, ptr);
1330        return ret;
1331}
1332
1333/*
1334 * Check for and extract a content-type parameter. "raw"
1335 * should be positioned at the start of the potential
1336 * parameter, with any whitespace already removed.
1337 *
1338 * "name" is the name of the parameter. The value is appended
1339 * to "out".
1340 */
1341static int extract_param(const char *raw, const char *name,
1342                         struct strbuf *out)
1343{
1344        size_t len = strlen(name);
1345
1346        if (strncasecmp(raw, name, len))
1347                return -1;
1348        raw += len;
1349
1350        if (*raw != '=')
1351                return -1;
1352        raw++;
1353
1354        while (*raw && !isspace(*raw) && *raw != ';')
1355                strbuf_addch(out, *raw++);
1356        return 0;
1357}
1358
1359/*
1360 * Extract a normalized version of the content type, with any
1361 * spaces suppressed, all letters lowercased, and no trailing ";"
1362 * or parameters.
1363 *
1364 * Note that we will silently remove even invalid whitespace. For
1365 * example, "text / plain" is specifically forbidden by RFC 2616,
1366 * but "text/plain" is the only reasonable output, and this keeps
1367 * our code simple.
1368 *
1369 * If the "charset" argument is not NULL, store the value of any
1370 * charset parameter there.
1371 *
1372 * Example:
1373 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1374 *   "text / plain" -> "text/plain"
1375 */
1376static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1377                                 struct strbuf *charset)
1378{
1379        const char *p;
1380
1381        strbuf_reset(type);
1382        strbuf_grow(type, raw->len);
1383        for (p = raw->buf; *p; p++) {
1384                if (isspace(*p))
1385                        continue;
1386                if (*p == ';') {
1387                        p++;
1388                        break;
1389                }
1390                strbuf_addch(type, tolower(*p));
1391        }
1392
1393        if (!charset)
1394                return;
1395
1396        strbuf_reset(charset);
1397        while (*p) {
1398                while (isspace(*p) || *p == ';')
1399                        p++;
1400                if (!extract_param(p, "charset", charset))
1401                        return;
1402                while (*p && !isspace(*p))
1403                        p++;
1404        }
1405
1406        if (!charset->len && starts_with(type->buf, "text/"))
1407                strbuf_addstr(charset, "ISO-8859-1");
1408}
1409
1410static void write_accept_language(struct strbuf *buf)
1411{
1412        /*
1413         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1414         * that, q-value will be smaller than 0.001, the minimum q-value the
1415         * HTTP specification allows. See
1416         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1417         */
1418        const int MAX_DECIMAL_PLACES = 3;
1419        const int MAX_LANGUAGE_TAGS = 1000;
1420        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1421        char **language_tags = NULL;
1422        int num_langs = 0;
1423        const char *s = get_preferred_languages();
1424        int i;
1425        struct strbuf tag = STRBUF_INIT;
1426
1427        /* Don't add Accept-Language header if no language is preferred. */
1428        if (!s)
1429                return;
1430
1431        /*
1432         * Split the colon-separated string of preferred languages into
1433         * language_tags array.
1434         */
1435        do {
1436                /* collect language tag */
1437                for (; *s && (isalnum(*s) || *s == '_'); s++)
1438                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1439
1440                /* skip .codeset, @modifier and any other unnecessary parts */
1441                while (*s && *s != ':')
1442                        s++;
1443
1444                if (tag.len) {
1445                        num_langs++;
1446                        REALLOC_ARRAY(language_tags, num_langs);
1447                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1448                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1449                                break;
1450                }
1451        } while (*s++);
1452
1453        /* write Accept-Language header into buf */
1454        if (num_langs) {
1455                int last_buf_len = 0;
1456                int max_q;
1457                int decimal_places;
1458                char q_format[32];
1459
1460                /* add '*' */
1461                REALLOC_ARRAY(language_tags, num_langs + 1);
1462                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1463
1464                /* compute decimal_places */
1465                for (max_q = 1, decimal_places = 0;
1466                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1467                     decimal_places++, max_q *= 10)
1468                        ;
1469
1470                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1471
1472                strbuf_addstr(buf, "Accept-Language: ");
1473
1474                for (i = 0; i < num_langs; i++) {
1475                        if (i > 0)
1476                                strbuf_addstr(buf, ", ");
1477
1478                        strbuf_addstr(buf, language_tags[i]);
1479
1480                        if (i > 0)
1481                                strbuf_addf(buf, q_format, max_q - i);
1482
1483                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1484                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1485                                break;
1486                        }
1487
1488                        last_buf_len = buf->len;
1489                }
1490        }
1491
1492        /* free language tags -- last one is a static '*' */
1493        for (i = 0; i < num_langs - 1; i++)
1494                free(language_tags[i]);
1495        free(language_tags);
1496}
1497
1498/*
1499 * Get an Accept-Language header which indicates user's preferred languages.
1500 *
1501 * Examples:
1502 *   LANGUAGE= -> ""
1503 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1504 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1505 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1506 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1507 *   LANGUAGE= LANG=C -> ""
1508 */
1509static const char *get_accept_language(void)
1510{
1511        if (!cached_accept_language) {
1512                struct strbuf buf = STRBUF_INIT;
1513                write_accept_language(&buf);
1514                if (buf.len > 0)
1515                        cached_accept_language = strbuf_detach(&buf, NULL);
1516        }
1517
1518        return cached_accept_language;
1519}
1520
1521static void http_opt_request_remainder(CURL *curl, off_t pos)
1522{
1523        char buf[128];
1524        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1525        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1526}
1527
1528/* http_request() targets */
1529#define HTTP_REQUEST_STRBUF     0
1530#define HTTP_REQUEST_FILE       1
1531
1532static int http_request(const char *url,
1533                        void *result, int target,
1534                        const struct http_get_options *options)
1535{
1536        struct active_request_slot *slot;
1537        struct slot_results results;
1538        struct curl_slist *headers = http_copy_default_headers();
1539        struct strbuf buf = STRBUF_INIT;
1540        const char *accept_language;
1541        int ret;
1542
1543        slot = get_active_slot();
1544        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1545
1546        if (result == NULL) {
1547                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1548        } else {
1549                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1550                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1551
1552                if (target == HTTP_REQUEST_FILE) {
1553                        off_t posn = ftello(result);
1554                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1555                                         fwrite);
1556                        if (posn > 0)
1557                                http_opt_request_remainder(slot->curl, posn);
1558                } else
1559                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1560                                         fwrite_buffer);
1561        }
1562
1563        accept_language = get_accept_language();
1564
1565        if (accept_language)
1566                headers = curl_slist_append(headers, accept_language);
1567
1568        strbuf_addstr(&buf, "Pragma:");
1569        if (options && options->no_cache)
1570                strbuf_addstr(&buf, " no-cache");
1571        if (options && options->keep_error)
1572                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1573
1574        headers = curl_slist_append(headers, buf.buf);
1575
1576        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1577        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1578        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1579
1580        ret = run_one_slot(slot, &results);
1581
1582        if (options && options->content_type) {
1583                struct strbuf raw = STRBUF_INIT;
1584                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1585                extract_content_type(&raw, options->content_type,
1586                                     options->charset);
1587                strbuf_release(&raw);
1588        }
1589
1590        if (options && options->effective_url)
1591                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1592                                options->effective_url);
1593
1594        curl_slist_free_all(headers);
1595        strbuf_release(&buf);
1596
1597        return ret;
1598}
1599
1600/*
1601 * Update the "base" url to a more appropriate value, as deduced by
1602 * redirects seen when requesting a URL starting with "url".
1603 *
1604 * The "asked" parameter is a URL that we asked curl to access, and must begin
1605 * with "base".
1606 *
1607 * The "got" parameter is the URL that curl reported to us as where we ended
1608 * up.
1609 *
1610 * Returns 1 if we updated the base url, 0 otherwise.
1611 *
1612 * Our basic strategy is to compare "base" and "asked" to find the bits
1613 * specific to our request. We then strip those bits off of "got" to yield the
1614 * new base. So for example, if our base is "http://example.com/foo.git",
1615 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1616 * with "https://other.example.com/foo.git/info/refs". We would want the
1617 * new URL to become "https://other.example.com/foo.git".
1618 *
1619 * Note that this assumes a sane redirect scheme. It's entirely possible
1620 * in the example above to end up at a URL that does not even end in
1621 * "info/refs".  In such a case we simply punt, as there is not much we can
1622 * do (and such a scheme is unlikely to represent a real git repository,
1623 * which means we are likely about to abort anyway).
1624 */
1625static int update_url_from_redirect(struct strbuf *base,
1626                                    const char *asked,
1627                                    const struct strbuf *got)
1628{
1629        const char *tail;
1630        size_t tail_len;
1631
1632        if (!strcmp(asked, got->buf))
1633                return 0;
1634
1635        if (!skip_prefix(asked, base->buf, &tail))
1636                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1637                    asked, base->buf);
1638
1639        tail_len = strlen(tail);
1640
1641        if (got->len < tail_len ||
1642            strcmp(tail, got->buf + got->len - tail_len))
1643                return 0; /* insane redirect scheme */
1644
1645        strbuf_reset(base);
1646        strbuf_add(base, got->buf, got->len - tail_len);
1647        return 1;
1648}
1649
1650static int http_request_reauth(const char *url,
1651                               void *result, int target,
1652                               struct http_get_options *options)
1653{
1654        int ret = http_request(url, result, target, options);
1655
1656        if (options && options->effective_url && options->base_url) {
1657                if (update_url_from_redirect(options->base_url,
1658                                             url, options->effective_url)) {
1659                        credential_from_url(&http_auth, options->base_url->buf);
1660                        url = options->effective_url->buf;
1661                }
1662        }
1663
1664        if (ret != HTTP_REAUTH)
1665                return ret;
1666
1667        /*
1668         * If we are using KEEP_ERROR, the previous request may have
1669         * put cruft into our output stream; we should clear it out before
1670         * making our next request. We only know how to do this for
1671         * the strbuf case, but that is enough to satisfy current callers.
1672         */
1673        if (options && options->keep_error) {
1674                switch (target) {
1675                case HTTP_REQUEST_STRBUF:
1676                        strbuf_reset(result);
1677                        break;
1678                default:
1679                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1680                }
1681        }
1682
1683        credential_fill(&http_auth);
1684
1685        return http_request(url, result, target, options);
1686}
1687
1688int http_get_strbuf(const char *url,
1689                    struct strbuf *result,
1690                    struct http_get_options *options)
1691{
1692        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1693}
1694
1695/*
1696 * Downloads a URL and stores the result in the given file.
1697 *
1698 * If a previous interrupted download is detected (i.e. a previous temporary
1699 * file is still around) the download is resumed.
1700 */
1701static int http_get_file(const char *url, const char *filename,
1702                         struct http_get_options *options)
1703{
1704        int ret;
1705        struct strbuf tmpfile = STRBUF_INIT;
1706        FILE *result;
1707
1708        strbuf_addf(&tmpfile, "%s.temp", filename);
1709        result = fopen(tmpfile.buf, "a");
1710        if (!result) {
1711                error("Unable to open local file %s", tmpfile.buf);
1712                ret = HTTP_ERROR;
1713                goto cleanup;
1714        }
1715
1716        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1717        fclose(result);
1718
1719        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1720                ret = HTTP_ERROR;
1721cleanup:
1722        strbuf_release(&tmpfile);
1723        return ret;
1724}
1725
1726int http_fetch_ref(const char *base, struct ref *ref)
1727{
1728        struct http_get_options options = {0};
1729        char *url;
1730        struct strbuf buffer = STRBUF_INIT;
1731        int ret = -1;
1732
1733        options.no_cache = 1;
1734
1735        url = quote_ref_url(base, ref->name);
1736        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1737                strbuf_rtrim(&buffer);
1738                if (buffer.len == 40)
1739                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
1740                else if (starts_with(buffer.buf, "ref: ")) {
1741                        ref->symref = xstrdup(buffer.buf + 5);
1742                        ret = 0;
1743                }
1744        }
1745
1746        strbuf_release(&buffer);
1747        free(url);
1748        return ret;
1749}
1750
1751/* Helpers for fetching packs */
1752static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1753{
1754        char *url, *tmp;
1755        struct strbuf buf = STRBUF_INIT;
1756
1757        if (http_is_verbose)
1758                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1759
1760        end_url_with_slash(&buf, base_url);
1761        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1762        url = strbuf_detach(&buf, NULL);
1763
1764        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1765        tmp = strbuf_detach(&buf, NULL);
1766
1767        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1768                error("Unable to get pack index %s", url);
1769                free(tmp);
1770                tmp = NULL;
1771        }
1772
1773        free(url);
1774        return tmp;
1775}
1776
1777static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1778        unsigned char *sha1, const char *base_url)
1779{
1780        struct packed_git *new_pack;
1781        char *tmp_idx = NULL;
1782        int ret;
1783
1784        if (has_pack_index(sha1)) {
1785                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1786                if (!new_pack)
1787                        return -1; /* parse_pack_index() already issued error message */
1788                goto add_pack;
1789        }
1790
1791        tmp_idx = fetch_pack_index(sha1, base_url);
1792        if (!tmp_idx)
1793                return -1;
1794
1795        new_pack = parse_pack_index(sha1, tmp_idx);
1796        if (!new_pack) {
1797                unlink(tmp_idx);
1798                free(tmp_idx);
1799
1800                return -1; /* parse_pack_index() already issued error message */
1801        }
1802
1803        ret = verify_pack_index(new_pack);
1804        if (!ret) {
1805                close_pack_index(new_pack);
1806                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1807        }
1808        free(tmp_idx);
1809        if (ret)
1810                return -1;
1811
1812add_pack:
1813        new_pack->next = *packs_head;
1814        *packs_head = new_pack;
1815        return 0;
1816}
1817
1818int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1819{
1820        struct http_get_options options = {0};
1821        int ret = 0, i = 0;
1822        char *url, *data;
1823        struct strbuf buf = STRBUF_INIT;
1824        unsigned char sha1[20];
1825
1826        end_url_with_slash(&buf, base_url);
1827        strbuf_addstr(&buf, "objects/info/packs");
1828        url = strbuf_detach(&buf, NULL);
1829
1830        options.no_cache = 1;
1831        ret = http_get_strbuf(url, &buf, &options);
1832        if (ret != HTTP_OK)
1833                goto cleanup;
1834
1835        data = buf.buf;
1836        while (i < buf.len) {
1837                switch (data[i]) {
1838                case 'P':
1839                        i++;
1840                        if (i + 52 <= buf.len &&
1841                            starts_with(data + i, " pack-") &&
1842                            starts_with(data + i + 46, ".pack\n")) {
1843                                get_sha1_hex(data + i + 6, sha1);
1844                                fetch_and_setup_pack_index(packs_head, sha1,
1845                                                      base_url);
1846                                i += 51;
1847                                break;
1848                        }
1849                default:
1850                        while (i < buf.len && data[i] != '\n')
1851                                i++;
1852                }
1853                i++;
1854        }
1855
1856cleanup:
1857        free(url);
1858        return ret;
1859}
1860
1861void release_http_pack_request(struct http_pack_request *preq)
1862{
1863        if (preq->packfile != NULL) {
1864                fclose(preq->packfile);
1865                preq->packfile = NULL;
1866        }
1867        preq->slot = NULL;
1868        free(preq->url);
1869        free(preq);
1870}
1871
1872int finish_http_pack_request(struct http_pack_request *preq)
1873{
1874        struct packed_git **lst;
1875        struct packed_git *p = preq->target;
1876        char *tmp_idx;
1877        size_t len;
1878        struct child_process ip = CHILD_PROCESS_INIT;
1879        const char *ip_argv[8];
1880
1881        close_pack_index(p);
1882
1883        fclose(preq->packfile);
1884        preq->packfile = NULL;
1885
1886        lst = preq->lst;
1887        while (*lst != p)
1888                lst = &((*lst)->next);
1889        *lst = (*lst)->next;
1890
1891        if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1892                die("BUG: pack tmpfile does not end in .pack.temp?");
1893        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1894
1895        ip_argv[0] = "index-pack";
1896        ip_argv[1] = "-o";
1897        ip_argv[2] = tmp_idx;
1898        ip_argv[3] = preq->tmpfile;
1899        ip_argv[4] = NULL;
1900
1901        ip.argv = ip_argv;
1902        ip.git_cmd = 1;
1903        ip.no_stdin = 1;
1904        ip.no_stdout = 1;
1905
1906        if (run_command(&ip)) {
1907                unlink(preq->tmpfile);
1908                unlink(tmp_idx);
1909                free(tmp_idx);
1910                return -1;
1911        }
1912
1913        unlink(sha1_pack_index_name(p->sha1));
1914
1915        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1916         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1917                free(tmp_idx);
1918                return -1;
1919        }
1920
1921        install_packed_git(p);
1922        free(tmp_idx);
1923        return 0;
1924}
1925
1926struct http_pack_request *new_http_pack_request(
1927        struct packed_git *target, const char *base_url)
1928{
1929        off_t prev_posn = 0;
1930        struct strbuf buf = STRBUF_INIT;
1931        struct http_pack_request *preq;
1932
1933        preq = xcalloc(1, sizeof(*preq));
1934        preq->target = target;
1935
1936        end_url_with_slash(&buf, base_url);
1937        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1938                sha1_to_hex(target->sha1));
1939        preq->url = strbuf_detach(&buf, NULL);
1940
1941        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1942                sha1_pack_name(target->sha1));
1943        preq->packfile = fopen(preq->tmpfile, "a");
1944        if (!preq->packfile) {
1945                error("Unable to open local file %s for pack",
1946                      preq->tmpfile);
1947                goto abort;
1948        }
1949
1950        preq->slot = get_active_slot();
1951        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1952        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1953        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1954        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1955                no_pragma_header);
1956
1957        /*
1958         * If there is data present from a previous transfer attempt,
1959         * resume where it left off
1960         */
1961        prev_posn = ftello(preq->packfile);
1962        if (prev_posn>0) {
1963                if (http_is_verbose)
1964                        fprintf(stderr,
1965                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1966                                sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1967                http_opt_request_remainder(preq->slot->curl, prev_posn);
1968        }
1969
1970        return preq;
1971
1972abort:
1973        free(preq->url);
1974        free(preq);
1975        return NULL;
1976}
1977
1978/* Helpers for fetching objects (loose) */
1979static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1980                               void *data)
1981{
1982        unsigned char expn[4096];
1983        size_t size = eltsize * nmemb;
1984        int posn = 0;
1985        struct http_object_request *freq = data;
1986        struct active_request_slot *slot = freq->slot;
1987
1988        if (slot) {
1989                CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
1990                                                &slot->http_code);
1991                if (c != CURLE_OK)
1992                        die("BUG: curl_easy_getinfo for HTTP code failed: %s",
1993                                curl_easy_strerror(c));
1994                if (slot->http_code >= 400)
1995                        return size;
1996        }
1997
1998        do {
1999                ssize_t retval = xwrite(freq->localfile,
2000                                        (char *) ptr + posn, size - posn);
2001                if (retval < 0)
2002                        return posn;
2003                posn += retval;
2004        } while (posn < size);
2005
2006        freq->stream.avail_in = size;
2007        freq->stream.next_in = (void *)ptr;
2008        do {
2009                freq->stream.next_out = expn;
2010                freq->stream.avail_out = sizeof(expn);
2011                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2012                git_SHA1_Update(&freq->c, expn,
2013                                sizeof(expn) - freq->stream.avail_out);
2014        } while (freq->stream.avail_in && freq->zret == Z_OK);
2015        return size;
2016}
2017
2018struct http_object_request *new_http_object_request(const char *base_url,
2019        unsigned char *sha1)
2020{
2021        char *hex = sha1_to_hex(sha1);
2022        const char *filename;
2023        char prevfile[PATH_MAX];
2024        int prevlocal;
2025        char prev_buf[PREV_BUF_SIZE];
2026        ssize_t prev_read = 0;
2027        off_t prev_posn = 0;
2028        struct http_object_request *freq;
2029
2030        freq = xcalloc(1, sizeof(*freq));
2031        hashcpy(freq->sha1, sha1);
2032        freq->localfile = -1;
2033
2034        filename = sha1_file_name(sha1);
2035        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2036                 "%s.temp", filename);
2037
2038        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2039        unlink_or_warn(prevfile);
2040        rename(freq->tmpfile, prevfile);
2041        unlink_or_warn(freq->tmpfile);
2042
2043        if (freq->localfile != -1)
2044                error("fd leakage in start: %d", freq->localfile);
2045        freq->localfile = open(freq->tmpfile,
2046                               O_WRONLY | O_CREAT | O_EXCL, 0666);
2047        /*
2048         * This could have failed due to the "lazy directory creation";
2049         * try to mkdir the last path component.
2050         */
2051        if (freq->localfile < 0 && errno == ENOENT) {
2052                char *dir = strrchr(freq->tmpfile, '/');
2053                if (dir) {
2054                        *dir = 0;
2055                        mkdir(freq->tmpfile, 0777);
2056                        *dir = '/';
2057                }
2058                freq->localfile = open(freq->tmpfile,
2059                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
2060        }
2061
2062        if (freq->localfile < 0) {
2063                error_errno("Couldn't create temporary file %s", freq->tmpfile);
2064                goto abort;
2065        }
2066
2067        git_inflate_init(&freq->stream);
2068
2069        git_SHA1_Init(&freq->c);
2070
2071        freq->url = get_remote_object_url(base_url, hex, 0);
2072
2073        /*
2074         * If a previous temp file is present, process what was already
2075         * fetched.
2076         */
2077        prevlocal = open(prevfile, O_RDONLY);
2078        if (prevlocal != -1) {
2079                do {
2080                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2081                        if (prev_read>0) {
2082                                if (fwrite_sha1_file(prev_buf,
2083                                                     1,
2084                                                     prev_read,
2085                                                     freq) == prev_read) {
2086                                        prev_posn += prev_read;
2087                                } else {
2088                                        prev_read = -1;
2089                                }
2090                        }
2091                } while (prev_read > 0);
2092                close(prevlocal);
2093        }
2094        unlink_or_warn(prevfile);
2095
2096        /*
2097         * Reset inflate/SHA1 if there was an error reading the previous temp
2098         * file; also rewind to the beginning of the local file.
2099         */
2100        if (prev_read == -1) {
2101                memset(&freq->stream, 0, sizeof(freq->stream));
2102                git_inflate_init(&freq->stream);
2103                git_SHA1_Init(&freq->c);
2104                if (prev_posn>0) {
2105                        prev_posn = 0;
2106                        lseek(freq->localfile, 0, SEEK_SET);
2107                        if (ftruncate(freq->localfile, 0) < 0) {
2108                                error_errno("Couldn't truncate temporary file %s",
2109                                            freq->tmpfile);
2110                                goto abort;
2111                        }
2112                }
2113        }
2114
2115        freq->slot = get_active_slot();
2116
2117        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2118        curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2119        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2120        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2121        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2122        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2123
2124        /*
2125         * If we have successfully processed data from a previous fetch
2126         * attempt, only fetch the data we don't already have.
2127         */
2128        if (prev_posn>0) {
2129                if (http_is_verbose)
2130                        fprintf(stderr,
2131                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2132                                hex, (uintmax_t)prev_posn);
2133                http_opt_request_remainder(freq->slot->curl, prev_posn);
2134        }
2135
2136        return freq;
2137
2138abort:
2139        free(freq->url);
2140        free(freq);
2141        return NULL;
2142}
2143
2144void process_http_object_request(struct http_object_request *freq)
2145{
2146        if (freq->slot == NULL)
2147                return;
2148        freq->curl_result = freq->slot->curl_result;
2149        freq->http_code = freq->slot->http_code;
2150        freq->slot = NULL;
2151}
2152
2153int finish_http_object_request(struct http_object_request *freq)
2154{
2155        struct stat st;
2156
2157        close(freq->localfile);
2158        freq->localfile = -1;
2159
2160        process_http_object_request(freq);
2161
2162        if (freq->http_code == 416) {
2163                warning("requested range invalid; we may already have all the data.");
2164        } else if (freq->curl_result != CURLE_OK) {
2165                if (stat(freq->tmpfile, &st) == 0)
2166                        if (st.st_size == 0)
2167                                unlink_or_warn(freq->tmpfile);
2168                return -1;
2169        }
2170
2171        git_inflate_end(&freq->stream);
2172        git_SHA1_Final(freq->real_sha1, &freq->c);
2173        if (freq->zret != Z_STREAM_END) {
2174                unlink_or_warn(freq->tmpfile);
2175                return -1;
2176        }
2177        if (hashcmp(freq->sha1, freq->real_sha1)) {
2178                unlink_or_warn(freq->tmpfile);
2179                return -1;
2180        }
2181        freq->rename =
2182                finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2183
2184        return freq->rename;
2185}
2186
2187void abort_http_object_request(struct http_object_request *freq)
2188{
2189        unlink_or_warn(freq->tmpfile);
2190
2191        release_http_object_request(freq);
2192}
2193
2194void release_http_object_request(struct http_object_request *freq)
2195{
2196        if (freq->localfile != -1) {
2197                close(freq->localfile);
2198                freq->localfile = -1;
2199        }
2200        if (freq->url != NULL) {
2201                free(freq->url);
2202                freq->url = NULL;
2203        }
2204        if (freq->slot != NULL) {
2205                freq->slot->callback_func = NULL;
2206                freq->slot->callback_data = NULL;
2207                release_active_slot(freq->slot);
2208                freq->slot = NULL;
2209        }
2210}