Andrew's git / gitweb.git / http.c
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http.con commit Merge branch 'sb/push-options' (cf27c79)
   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
 204#ifdef USE_CURL_MULTI
 205static void process_curl_messages(void)
 206{
 207        int num_messages;
 208        struct active_request_slot *slot;
 209        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 210
 211        while (curl_message != NULL) {
 212                if (curl_message->msg == CURLMSG_DONE) {
 213                        int curl_result = curl_message->data.result;
 214                        slot = active_queue_head;
 215                        while (slot != NULL &&
 216                               slot->curl != curl_message->easy_handle)
 217                                slot = slot->next;
 218                        if (slot != NULL) {
 219                                curl_multi_remove_handle(curlm, slot->curl);
 220                                slot->curl_result = curl_result;
 221                                finish_active_slot(slot);
 222                        } else {
 223                                fprintf(stderr, "Received DONE message for unknown request!\n");
 224                        }
 225                } else {
 226                        fprintf(stderr, "Unknown CURL message received: %d\n",
 227                                (int)curl_message->msg);
 228                }
 229                curl_message = curl_multi_info_read(curlm, &num_messages);
 230        }
 231}
 232#endif
 233
 234static int http_options(const char *var, const char *value, void *cb)
 235{
 236        if (!strcmp("http.sslverify", var)) {
 237                curl_ssl_verify = git_config_bool(var, value);
 238                return 0;
 239        }
 240        if (!strcmp("http.sslcipherlist", var))
 241                return git_config_string(&ssl_cipherlist, var, value);
 242        if (!strcmp("http.sslversion", var))
 243                return git_config_string(&ssl_version, var, value);
 244        if (!strcmp("http.sslcert", var))
 245                return git_config_string(&ssl_cert, var, value);
 246#if LIBCURL_VERSION_NUM >= 0x070903
 247        if (!strcmp("http.sslkey", var))
 248                return git_config_string(&ssl_key, var, value);
 249#endif
 250#if LIBCURL_VERSION_NUM >= 0x070908
 251        if (!strcmp("http.sslcapath", var))
 252                return git_config_pathname(&ssl_capath, var, value);
 253#endif
 254        if (!strcmp("http.sslcainfo", var))
 255                return git_config_pathname(&ssl_cainfo, var, value);
 256        if (!strcmp("http.sslcertpasswordprotected", var)) {
 257                ssl_cert_password_required = git_config_bool(var, value);
 258                return 0;
 259        }
 260        if (!strcmp("http.ssltry", var)) {
 261                curl_ssl_try = git_config_bool(var, value);
 262                return 0;
 263        }
 264        if (!strcmp("http.minsessions", var)) {
 265                min_curl_sessions = git_config_int(var, value);
 266#ifndef USE_CURL_MULTI
 267                if (min_curl_sessions > 1)
 268                        min_curl_sessions = 1;
 269#endif
 270                return 0;
 271        }
 272#ifdef USE_CURL_MULTI
 273        if (!strcmp("http.maxrequests", var)) {
 274                max_requests = git_config_int(var, value);
 275                return 0;
 276        }
 277#endif
 278        if (!strcmp("http.lowspeedlimit", var)) {
 279                curl_low_speed_limit = (long)git_config_int(var, value);
 280                return 0;
 281        }
 282        if (!strcmp("http.lowspeedtime", var)) {
 283                curl_low_speed_time = (long)git_config_int(var, value);
 284                return 0;
 285        }
 286
 287        if (!strcmp("http.noepsv", var)) {
 288                curl_ftp_no_epsv = git_config_bool(var, value);
 289                return 0;
 290        }
 291        if (!strcmp("http.proxy", var))
 292                return git_config_string(&curl_http_proxy, var, value);
 293
 294        if (!strcmp("http.proxyauthmethod", var))
 295                return git_config_string(&http_proxy_authmethod, var, value);
 296
 297        if (!strcmp("http.cookiefile", var))
 298                return git_config_pathname(&curl_cookie_file, var, value);
 299        if (!strcmp("http.savecookies", var)) {
 300                curl_save_cookies = git_config_bool(var, value);
 301                return 0;
 302        }
 303
 304        if (!strcmp("http.postbuffer", var)) {
 305                http_post_buffer = git_config_int(var, value);
 306                if (http_post_buffer < LARGE_PACKET_MAX)
 307                        http_post_buffer = LARGE_PACKET_MAX;
 308                return 0;
 309        }
 310
 311        if (!strcmp("http.useragent", var))
 312                return git_config_string(&user_agent, var, value);
 313
 314        if (!strcmp("http.emptyauth", var)) {
 315                curl_empty_auth = git_config_bool(var, value);
 316                return 0;
 317        }
 318
 319        if (!strcmp("http.pinnedpubkey", var)) {
 320#if LIBCURL_VERSION_NUM >= 0x072c00
 321                return git_config_pathname(&ssl_pinnedkey, var, value);
 322#else
 323                warning(_("Public key pinning not supported with cURL < 7.44.0"));
 324                return 0;
 325#endif
 326        }
 327
 328        if (!strcmp("http.extraheader", var)) {
 329                if (!value) {
 330                        return config_error_nonbool(var);
 331                } else if (!*value) {
 332                        curl_slist_free_all(extra_http_headers);
 333                        extra_http_headers = NULL;
 334                } else {
 335                        extra_http_headers =
 336                                curl_slist_append(extra_http_headers, value);
 337                }
 338                return 0;
 339        }
 340
 341        /* Fall back on the default ones */
 342        return git_default_config(var, value, cb);
 343}
 344
 345static void init_curl_http_auth(CURL *result)
 346{
 347        if (!http_auth.username) {
 348                if (curl_empty_auth)
 349                        curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 350                return;
 351        }
 352
 353        credential_fill(&http_auth);
 354
 355#if LIBCURL_VERSION_NUM >= 0x071301
 356        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 357        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 358#else
 359        {
 360                static struct strbuf up = STRBUF_INIT;
 361                /*
 362                 * Note that we assume we only ever have a single set of
 363                 * credentials in a given program run, so we do not have
 364                 * to worry about updating this buffer, only setting its
 365                 * initial value.
 366                 */
 367                if (!up.len)
 368                        strbuf_addf(&up, "%s:%s",
 369                                http_auth.username, http_auth.password);
 370                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 371        }
 372#endif
 373}
 374
 375/* *var must be free-able */
 376static void var_override(const char **var, char *value)
 377{
 378        if (value) {
 379                free((void *)*var);
 380                *var = xstrdup(value);
 381        }
 382}
 383
 384static void set_proxyauth_name_password(CURL *result)
 385{
 386#if LIBCURL_VERSION_NUM >= 0x071301
 387                curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 388                        proxy_auth.username);
 389                curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 390                        proxy_auth.password);
 391#else
 392                struct strbuf s = STRBUF_INIT;
 393
 394                strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 395                strbuf_addch(&s, ':');
 396                strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 397                curl_proxyuserpwd = strbuf_detach(&s, NULL);
 398                curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 399#endif
 400}
 401
 402static void init_curl_proxy_auth(CURL *result)
 403{
 404        if (proxy_auth.username) {
 405                if (!proxy_auth.password)
 406                        credential_fill(&proxy_auth);
 407                set_proxyauth_name_password(result);
 408        }
 409
 410        var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 411
 412#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 413        if (http_proxy_authmethod) {
 414                int i;
 415                for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 416                        if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 417                                curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 418                                                proxy_authmethods[i].curlauth_param);
 419                                break;
 420                        }
 421                }
 422                if (i == ARRAY_SIZE(proxy_authmethods)) {
 423                        warning("unsupported proxy authentication method %s: using anyauth",
 424                                        http_proxy_authmethod);
 425                        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 426                }
 427        }
 428        else
 429                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 430#endif
 431}
 432
 433static int has_cert_password(void)
 434{
 435        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 436                return 0;
 437        if (!cert_auth.password) {
 438                cert_auth.protocol = xstrdup("cert");
 439                cert_auth.username = xstrdup("");
 440                cert_auth.path = xstrdup(ssl_cert);
 441                credential_fill(&cert_auth);
 442        }
 443        return 1;
 444}
 445
 446#if LIBCURL_VERSION_NUM >= 0x071900
 447static void set_curl_keepalive(CURL *c)
 448{
 449        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 450}
 451
 452#elif LIBCURL_VERSION_NUM >= 0x071000
 453static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 454{
 455        int ka = 1;
 456        int rc;
 457        socklen_t len = (socklen_t)sizeof(ka);
 458
 459        if (type != CURLSOCKTYPE_IPCXN)
 460                return 0;
 461
 462        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 463        if (rc < 0)
 464                warning_errno("unable to set SO_KEEPALIVE on socket");
 465
 466        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 467}
 468
 469static void set_curl_keepalive(CURL *c)
 470{
 471        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 472}
 473
 474#else
 475static void set_curl_keepalive(CURL *c)
 476{
 477        /* not supported on older curl versions */
 478}
 479#endif
 480
 481static void redact_sensitive_header(struct strbuf *header)
 482{
 483        const char *sensitive_header;
 484
 485        if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 486            skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 487                /* The first token is the type, which is OK to log */
 488                while (isspace(*sensitive_header))
 489                        sensitive_header++;
 490                while (*sensitive_header && !isspace(*sensitive_header))
 491                        sensitive_header++;
 492                /* Everything else is opaque and possibly sensitive */
 493                strbuf_setlen(header,  sensitive_header - header->buf);
 494                strbuf_addstr(header, " <redacted>");
 495        }
 496}
 497
 498static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 499{
 500        struct strbuf out = STRBUF_INIT;
 501        struct strbuf **headers, **header;
 502
 503        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 504                text, (long)size, (long)size);
 505        trace_strbuf(&trace_curl, &out);
 506        strbuf_reset(&out);
 507        strbuf_add(&out, ptr, size);
 508        headers = strbuf_split_max(&out, '\n', 0);
 509
 510        for (header = headers; *header; header++) {
 511                if (hide_sensitive_header)
 512                        redact_sensitive_header(*header);
 513                strbuf_insert((*header), 0, text, strlen(text));
 514                strbuf_insert((*header), strlen(text), ": ", 2);
 515                strbuf_rtrim((*header));
 516                strbuf_addch((*header), '\n');
 517                trace_strbuf(&trace_curl, (*header));
 518        }
 519        strbuf_list_free(headers);
 520        strbuf_release(&out);
 521}
 522
 523static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 524{
 525        size_t i;
 526        struct strbuf out = STRBUF_INIT;
 527        unsigned int width = 60;
 528
 529        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 530                text, (long)size, (long)size);
 531        trace_strbuf(&trace_curl, &out);
 532
 533        for (i = 0; i < size; i += width) {
 534                size_t w;
 535
 536                strbuf_reset(&out);
 537                strbuf_addf(&out, "%s: ", text);
 538                for (w = 0; (w < width) && (i + w < size); w++) {
 539                        unsigned char ch = ptr[i + w];
 540
 541                        strbuf_addch(&out,
 542                                       (ch >= 0x20) && (ch < 0x80)
 543                                       ? ch : '.');
 544                }
 545                strbuf_addch(&out, '\n');
 546                trace_strbuf(&trace_curl, &out);
 547        }
 548        strbuf_release(&out);
 549}
 550
 551static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 552{
 553        const char *text;
 554        enum { NO_FILTER = 0, DO_FILTER = 1 };
 555
 556        switch (type) {
 557        case CURLINFO_TEXT:
 558                trace_printf_key(&trace_curl, "== Info: %s", data);
 559        default:                /* we ignore unknown types by default */
 560                return 0;
 561
 562        case CURLINFO_HEADER_OUT:
 563                text = "=> Send header";
 564                curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 565                break;
 566        case CURLINFO_DATA_OUT:
 567                text = "=> Send data";
 568                curl_dump_data(text, (unsigned char *)data, size);
 569                break;
 570        case CURLINFO_SSL_DATA_OUT:
 571                text = "=> Send SSL data";
 572                curl_dump_data(text, (unsigned char *)data, size);
 573                break;
 574        case CURLINFO_HEADER_IN:
 575                text = "<= Recv header";
 576                curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 577                break;
 578        case CURLINFO_DATA_IN:
 579                text = "<= Recv data";
 580                curl_dump_data(text, (unsigned char *)data, size);
 581                break;
 582        case CURLINFO_SSL_DATA_IN:
 583                text = "<= Recv SSL data";
 584                curl_dump_data(text, (unsigned char *)data, size);
 585                break;
 586        }
 587        return 0;
 588}
 589
 590void setup_curl_trace(CURL *handle)
 591{
 592        if (!trace_want(&trace_curl))
 593                return;
 594        curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 595        curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 596        curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 597}
 598
 599
 600static CURL *get_curl_handle(void)
 601{
 602        CURL *result = curl_easy_init();
 603        long allowed_protocols = 0;
 604
 605        if (!result)
 606                die("curl_easy_init failed");
 607
 608        if (!curl_ssl_verify) {
 609                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 610                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 611        } else {
 612                /* Verify authenticity of the peer's certificate */
 613                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 614                /* The name in the cert must match whom we tried to connect */
 615                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 616        }
 617
 618#if LIBCURL_VERSION_NUM >= 0x070907
 619        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 620#endif
 621#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 622        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 623#endif
 624
 625        if (http_proactive_auth)
 626                init_curl_http_auth(result);
 627
 628        if (getenv("GIT_SSL_VERSION"))
 629                ssl_version = getenv("GIT_SSL_VERSION");
 630        if (ssl_version && *ssl_version) {
 631                int i;
 632                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 633                        if (!strcmp(ssl_version, sslversions[i].name)) {
 634                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 635                                                 sslversions[i].ssl_version);
 636                                break;
 637                        }
 638                }
 639                if (i == ARRAY_SIZE(sslversions))
 640                        warning("unsupported ssl version %s: using default",
 641                                ssl_version);
 642        }
 643
 644        if (getenv("GIT_SSL_CIPHER_LIST"))
 645                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 646        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 647                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 648                                ssl_cipherlist);
 649
 650        if (ssl_cert != NULL)
 651                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 652        if (has_cert_password())
 653                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 654#if LIBCURL_VERSION_NUM >= 0x070903
 655        if (ssl_key != NULL)
 656                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 657#endif
 658#if LIBCURL_VERSION_NUM >= 0x070908
 659        if (ssl_capath != NULL)
 660                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 661#endif
 662#if LIBCURL_VERSION_NUM >= 0x072c00
 663        if (ssl_pinnedkey != NULL)
 664                curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 665#endif
 666        if (ssl_cainfo != NULL)
 667                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 668
 669        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 670                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 671                                 curl_low_speed_limit);
 672                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 673                                 curl_low_speed_time);
 674        }
 675
 676        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 677        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 678#if LIBCURL_VERSION_NUM >= 0x071301
 679        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 680#elif LIBCURL_VERSION_NUM >= 0x071101
 681        curl_easy_setopt(result, CURLOPT_POST301, 1);
 682#endif
 683#if LIBCURL_VERSION_NUM >= 0x071304
 684        if (is_transport_allowed("http"))
 685                allowed_protocols |= CURLPROTO_HTTP;
 686        if (is_transport_allowed("https"))
 687                allowed_protocols |= CURLPROTO_HTTPS;
 688        if (is_transport_allowed("ftp"))
 689                allowed_protocols |= CURLPROTO_FTP;
 690        if (is_transport_allowed("ftps"))
 691                allowed_protocols |= CURLPROTO_FTPS;
 692        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 693#else
 694        if (transport_restrict_protocols())
 695                warning("protocol restrictions not applied to curl redirects because\n"
 696                        "your curl version is too old (>= 7.19.4)");
 697#endif
 698        if (getenv("GIT_CURL_VERBOSE"))
 699                curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
 700        setup_curl_trace(result);
 701
 702        curl_easy_setopt(result, CURLOPT_USERAGENT,
 703                user_agent ? user_agent : git_user_agent());
 704
 705        if (curl_ftp_no_epsv)
 706                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 707
 708#ifdef CURLOPT_USE_SSL
 709        if (curl_ssl_try)
 710                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 711#endif
 712
 713        /*
 714         * CURL also examines these variables as a fallback; but we need to query
 715         * them here in order to decide whether to prompt for missing password (cf.
 716         * init_curl_proxy_auth()).
 717         *
 718         * Unlike many other common environment variables, these are historically
 719         * lowercase only. It appears that CURL did not know this and implemented
 720         * only uppercase variants, which was later corrected to take both - with
 721         * the exception of http_proxy, which is lowercase only also in CURL. As
 722         * the lowercase versions are the historical quasi-standard, they take
 723         * precedence here, as in CURL.
 724         */
 725        if (!curl_http_proxy) {
 726                if (!strcmp(http_auth.protocol, "https")) {
 727                        var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 728                        var_override(&curl_http_proxy, getenv("https_proxy"));
 729                } else {
 730                        var_override(&curl_http_proxy, getenv("http_proxy"));
 731                }
 732                if (!curl_http_proxy) {
 733                        var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 734                        var_override(&curl_http_proxy, getenv("all_proxy"));
 735                }
 736        }
 737
 738        if (curl_http_proxy) {
 739                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 740#if LIBCURL_VERSION_NUM >= 0x071800
 741                if (starts_with(curl_http_proxy, "socks5h"))
 742                        curl_easy_setopt(result,
 743                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
 744                else if (starts_with(curl_http_proxy, "socks5"))
 745                        curl_easy_setopt(result,
 746                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 747                else if (starts_with(curl_http_proxy, "socks4a"))
 748                        curl_easy_setopt(result,
 749                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 750                else if (starts_with(curl_http_proxy, "socks"))
 751                        curl_easy_setopt(result,
 752                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 753#endif
 754                if (strstr(curl_http_proxy, "://"))
 755                        credential_from_url(&proxy_auth, curl_http_proxy);
 756                else {
 757                        struct strbuf url = STRBUF_INIT;
 758                        strbuf_addf(&url, "http://%s", curl_http_proxy);
 759                        credential_from_url(&proxy_auth, url.buf);
 760                        strbuf_release(&url);
 761                }
 762
 763                curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 764#if LIBCURL_VERSION_NUM >= 0x071304
 765                var_override(&curl_no_proxy, getenv("NO_PROXY"));
 766                var_override(&curl_no_proxy, getenv("no_proxy"));
 767                curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 768#endif
 769        }
 770        init_curl_proxy_auth(result);
 771
 772        set_curl_keepalive(result);
 773
 774        return result;
 775}
 776
 777static void set_from_env(const char **var, const char *envname)
 778{
 779        const char *val = getenv(envname);
 780        if (val)
 781                *var = val;
 782}
 783
 784void http_init(struct remote *remote, const char *url, int proactive_auth)
 785{
 786        char *low_speed_limit;
 787        char *low_speed_time;
 788        char *normalized_url;
 789        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 790
 791        config.section = "http";
 792        config.key = NULL;
 793        config.collect_fn = http_options;
 794        config.cascade_fn = git_default_config;
 795        config.cb = NULL;
 796
 797        http_is_verbose = 0;
 798        normalized_url = url_normalize(url, &config.url);
 799
 800        git_config(urlmatch_config_entry, &config);
 801        free(normalized_url);
 802
 803        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 804                die("curl_global_init failed");
 805
 806        http_proactive_auth = proactive_auth;
 807
 808        if (remote && remote->http_proxy)
 809                curl_http_proxy = xstrdup(remote->http_proxy);
 810
 811        if (remote)
 812                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 813
 814        pragma_header = curl_slist_append(http_copy_default_headers(),
 815                "Pragma: no-cache");
 816        no_pragma_header = curl_slist_append(http_copy_default_headers(),
 817                "Pragma:");
 818
 819#ifdef USE_CURL_MULTI
 820        {
 821                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 822                if (http_max_requests != NULL)
 823                        max_requests = atoi(http_max_requests);
 824        }
 825
 826        curlm = curl_multi_init();
 827        if (!curlm)
 828                die("curl_multi_init failed");
 829#endif
 830
 831        if (getenv("GIT_SSL_NO_VERIFY"))
 832                curl_ssl_verify = 0;
 833
 834        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 835#if LIBCURL_VERSION_NUM >= 0x070903
 836        set_from_env(&ssl_key, "GIT_SSL_KEY");
 837#endif
 838#if LIBCURL_VERSION_NUM >= 0x070908
 839        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 840#endif
 841        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 842
 843        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 844
 845        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 846        if (low_speed_limit != NULL)
 847                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 848        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 849        if (low_speed_time != NULL)
 850                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 851
 852        if (curl_ssl_verify == -1)
 853                curl_ssl_verify = 1;
 854
 855        curl_session_count = 0;
 856#ifdef USE_CURL_MULTI
 857        if (max_requests < 1)
 858                max_requests = DEFAULT_MAX_REQUESTS;
 859#endif
 860
 861        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 862                curl_ftp_no_epsv = 1;
 863
 864        if (url) {
 865                credential_from_url(&http_auth, url);
 866                if (!ssl_cert_password_required &&
 867                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 868                    starts_with(url, "https://"))
 869                        ssl_cert_password_required = 1;
 870        }
 871
 872#ifndef NO_CURL_EASY_DUPHANDLE
 873        curl_default = get_curl_handle();
 874#endif
 875}
 876
 877void http_cleanup(void)
 878{
 879        struct active_request_slot *slot = active_queue_head;
 880
 881        while (slot != NULL) {
 882                struct active_request_slot *next = slot->next;
 883                if (slot->curl != NULL) {
 884#ifdef USE_CURL_MULTI
 885                        curl_multi_remove_handle(curlm, slot->curl);
 886#endif
 887                        curl_easy_cleanup(slot->curl);
 888                }
 889                free(slot);
 890                slot = next;
 891        }
 892        active_queue_head = NULL;
 893
 894#ifndef NO_CURL_EASY_DUPHANDLE
 895        curl_easy_cleanup(curl_default);
 896#endif
 897
 898#ifdef USE_CURL_MULTI
 899        curl_multi_cleanup(curlm);
 900#endif
 901        curl_global_cleanup();
 902
 903        curl_slist_free_all(extra_http_headers);
 904        extra_http_headers = NULL;
 905
 906        curl_slist_free_all(pragma_header);
 907        pragma_header = NULL;
 908
 909        curl_slist_free_all(no_pragma_header);
 910        no_pragma_header = NULL;
 911
 912        if (curl_http_proxy) {
 913                free((void *)curl_http_proxy);
 914                curl_http_proxy = NULL;
 915        }
 916
 917        if (proxy_auth.password) {
 918                memset(proxy_auth.password, 0, strlen(proxy_auth.password));
 919                free(proxy_auth.password);
 920                proxy_auth.password = NULL;
 921        }
 922
 923        free((void *)curl_proxyuserpwd);
 924        curl_proxyuserpwd = NULL;
 925
 926        free((void *)http_proxy_authmethod);
 927        http_proxy_authmethod = NULL;
 928
 929        if (cert_auth.password != NULL) {
 930                memset(cert_auth.password, 0, strlen(cert_auth.password));
 931                free(cert_auth.password);
 932                cert_auth.password = NULL;
 933        }
 934        ssl_cert_password_required = 0;
 935
 936        free(cached_accept_language);
 937        cached_accept_language = NULL;
 938}
 939
 940struct active_request_slot *get_active_slot(void)
 941{
 942        struct active_request_slot *slot = active_queue_head;
 943        struct active_request_slot *newslot;
 944
 945#ifdef USE_CURL_MULTI
 946        int num_transfers;
 947
 948        /* Wait for a slot to open up if the queue is full */
 949        while (active_requests >= max_requests) {
 950                curl_multi_perform(curlm, &num_transfers);
 951                if (num_transfers < active_requests)
 952                        process_curl_messages();
 953        }
 954#endif
 955
 956        while (slot != NULL && slot->in_use)
 957                slot = slot->next;
 958
 959        if (slot == NULL) {
 960                newslot = xmalloc(sizeof(*newslot));
 961                newslot->curl = NULL;
 962                newslot->in_use = 0;
 963                newslot->next = NULL;
 964
 965                slot = active_queue_head;
 966                if (slot == NULL) {
 967                        active_queue_head = newslot;
 968                } else {
 969                        while (slot->next != NULL)
 970                                slot = slot->next;
 971                        slot->next = newslot;
 972                }
 973                slot = newslot;
 974        }
 975
 976        if (slot->curl == NULL) {
 977#ifdef NO_CURL_EASY_DUPHANDLE
 978                slot->curl = get_curl_handle();
 979#else
 980                slot->curl = curl_easy_duphandle(curl_default);
 981#endif
 982                curl_session_count++;
 983        }
 984
 985        active_requests++;
 986        slot->in_use = 1;
 987        slot->results = NULL;
 988        slot->finished = NULL;
 989        slot->callback_data = NULL;
 990        slot->callback_func = NULL;
 991        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 992        if (curl_save_cookies)
 993                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 994        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 995        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 996        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 997        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 998        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 999        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1000        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1001        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1002        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1003        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1004
1005#if LIBCURL_VERSION_NUM >= 0x070a08
1006        curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1007#endif
1008#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1009        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1010#endif
1011        if (http_auth.password || curl_empty_auth)
1012                init_curl_http_auth(slot->curl);
1013
1014        return slot;
1015}
1016
1017int start_active_slot(struct active_request_slot *slot)
1018{
1019#ifdef USE_CURL_MULTI
1020        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1021        int num_transfers;
1022
1023        if (curlm_result != CURLM_OK &&
1024            curlm_result != CURLM_CALL_MULTI_PERFORM) {
1025                active_requests--;
1026                slot->in_use = 0;
1027                return 0;
1028        }
1029
1030        /*
1031         * We know there must be something to do, since we just added
1032         * something.
1033         */
1034        curl_multi_perform(curlm, &num_transfers);
1035#endif
1036        return 1;
1037}
1038
1039#ifdef USE_CURL_MULTI
1040struct fill_chain {
1041        void *data;
1042        int (*fill)(void *);
1043        struct fill_chain *next;
1044};
1045
1046static struct fill_chain *fill_cfg;
1047
1048void add_fill_function(void *data, int (*fill)(void *))
1049{
1050        struct fill_chain *new = xmalloc(sizeof(*new));
1051        struct fill_chain **linkp = &fill_cfg;
1052        new->data = data;
1053        new->fill = fill;
1054        new->next = NULL;
1055        while (*linkp)
1056                linkp = &(*linkp)->next;
1057        *linkp = new;
1058}
1059
1060void fill_active_slots(void)
1061{
1062        struct active_request_slot *slot = active_queue_head;
1063
1064        while (active_requests < max_requests) {
1065                struct fill_chain *fill;
1066                for (fill = fill_cfg; fill; fill = fill->next)
1067                        if (fill->fill(fill->data))
1068                                break;
1069
1070                if (!fill)
1071                        break;
1072        }
1073
1074        while (slot != NULL) {
1075                if (!slot->in_use && slot->curl != NULL
1076                        && curl_session_count > min_curl_sessions) {
1077                        curl_easy_cleanup(slot->curl);
1078                        slot->curl = NULL;
1079                        curl_session_count--;
1080                }
1081                slot = slot->next;
1082        }
1083}
1084
1085void step_active_slots(void)
1086{
1087        int num_transfers;
1088        CURLMcode curlm_result;
1089
1090        do {
1091                curlm_result = curl_multi_perform(curlm, &num_transfers);
1092        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1093        if (num_transfers < active_requests) {
1094                process_curl_messages();
1095                fill_active_slots();
1096        }
1097}
1098#endif
1099
1100void run_active_slot(struct active_request_slot *slot)
1101{
1102#ifdef USE_CURL_MULTI
1103        fd_set readfds;
1104        fd_set writefds;
1105        fd_set excfds;
1106        int max_fd;
1107        struct timeval select_timeout;
1108        int finished = 0;
1109
1110        slot->finished = &finished;
1111        while (!finished) {
1112                step_active_slots();
1113
1114                if (slot->in_use) {
1115#if LIBCURL_VERSION_NUM >= 0x070f04
1116                        long curl_timeout;
1117                        curl_multi_timeout(curlm, &curl_timeout);
1118                        if (curl_timeout == 0) {
1119                                continue;
1120                        } else if (curl_timeout == -1) {
1121                                select_timeout.tv_sec  = 0;
1122                                select_timeout.tv_usec = 50000;
1123                        } else {
1124                                select_timeout.tv_sec  =  curl_timeout / 1000;
1125                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1126                        }
1127#else
1128                        select_timeout.tv_sec  = 0;
1129                        select_timeout.tv_usec = 50000;
1130#endif
1131
1132                        max_fd = -1;
1133                        FD_ZERO(&readfds);
1134                        FD_ZERO(&writefds);
1135                        FD_ZERO(&excfds);
1136                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1137
1138                        /*
1139                         * It can happen that curl_multi_timeout returns a pathologically
1140                         * long timeout when curl_multi_fdset returns no file descriptors
1141                         * to read.  See commit message for more details.
1142                         */
1143                        if (max_fd < 0 &&
1144                            (select_timeout.tv_sec > 0 ||
1145                             select_timeout.tv_usec > 50000)) {
1146                                select_timeout.tv_sec  = 0;
1147                                select_timeout.tv_usec = 50000;
1148                        }
1149
1150                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1151                }
1152        }
1153#else
1154        while (slot->in_use) {
1155                slot->curl_result = curl_easy_perform(slot->curl);
1156                finish_active_slot(slot);
1157        }
1158#endif
1159}
1160
1161static void release_active_slot(struct active_request_slot *slot)
1162{
1163        closedown_active_slot(slot);
1164        if (slot->curl && curl_session_count > min_curl_sessions) {
1165#ifdef USE_CURL_MULTI
1166                curl_multi_remove_handle(curlm, slot->curl);
1167#endif
1168                curl_easy_cleanup(slot->curl);
1169                slot->curl = NULL;
1170                curl_session_count--;
1171        }
1172#ifdef USE_CURL_MULTI
1173        fill_active_slots();
1174#endif
1175}
1176
1177void finish_all_active_slots(void)
1178{
1179        struct active_request_slot *slot = active_queue_head;
1180
1181        while (slot != NULL)
1182                if (slot->in_use) {
1183                        run_active_slot(slot);
1184                        slot = active_queue_head;
1185                } else {
1186                        slot = slot->next;
1187                }
1188}
1189
1190/* Helpers for modifying and creating URLs */
1191static inline int needs_quote(int ch)
1192{
1193        if (((ch >= 'A') && (ch <= 'Z'))
1194                        || ((ch >= 'a') && (ch <= 'z'))
1195                        || ((ch >= '0') && (ch <= '9'))
1196                        || (ch == '/')
1197                        || (ch == '-')
1198                        || (ch == '.'))
1199                return 0;
1200        return 1;
1201}
1202
1203static char *quote_ref_url(const char *base, const char *ref)
1204{
1205        struct strbuf buf = STRBUF_INIT;
1206        const char *cp;
1207        int ch;
1208
1209        end_url_with_slash(&buf, base);
1210
1211        for (cp = ref; (ch = *cp) != 0; cp++)
1212                if (needs_quote(ch))
1213                        strbuf_addf(&buf, "%%%02x", ch);
1214                else
1215                        strbuf_addch(&buf, *cp);
1216
1217        return strbuf_detach(&buf, NULL);
1218}
1219
1220void append_remote_object_url(struct strbuf *buf, const char *url,
1221                              const char *hex,
1222                              int only_two_digit_prefix)
1223{
1224        end_url_with_slash(buf, url);
1225
1226        strbuf_addf(buf, "objects/%.*s/", 2, hex);
1227        if (!only_two_digit_prefix)
1228                strbuf_addf(buf, "%s", hex+2);
1229}
1230
1231char *get_remote_object_url(const char *url, const char *hex,
1232                            int only_two_digit_prefix)
1233{
1234        struct strbuf buf = STRBUF_INIT;
1235        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1236        return strbuf_detach(&buf, NULL);
1237}
1238
1239static int handle_curl_result(struct slot_results *results)
1240{
1241        /*
1242         * If we see a failing http code with CURLE_OK, we have turned off
1243         * FAILONERROR (to keep the server's custom error response), and should
1244         * translate the code into failure here.
1245         */
1246        if (results->curl_result == CURLE_OK &&
1247            results->http_code >= 400) {
1248                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1249                /*
1250                 * Normally curl will already have put the "reason phrase"
1251                 * from the server into curl_errorstr; unfortunately without
1252                 * FAILONERROR it is lost, so we can give only the numeric
1253                 * status code.
1254                 */
1255                snprintf(curl_errorstr, sizeof(curl_errorstr),
1256                         "The requested URL returned error: %ld",
1257                         results->http_code);
1258        }
1259
1260        if (results->curl_result == CURLE_OK) {
1261                credential_approve(&http_auth);
1262                if (proxy_auth.password)
1263                        credential_approve(&proxy_auth);
1264                return HTTP_OK;
1265        } else if (missing_target(results))
1266                return HTTP_MISSING_TARGET;
1267        else if (results->http_code == 401) {
1268                if (http_auth.username && http_auth.password) {
1269                        credential_reject(&http_auth);
1270                        return HTTP_NOAUTH;
1271                } else {
1272#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1273                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1274#endif
1275                        return HTTP_REAUTH;
1276                }
1277        } else {
1278                if (results->http_connectcode == 407)
1279                        credential_reject(&proxy_auth);
1280#if LIBCURL_VERSION_NUM >= 0x070c00
1281                if (!curl_errorstr[0])
1282                        strlcpy(curl_errorstr,
1283                                curl_easy_strerror(results->curl_result),
1284                                sizeof(curl_errorstr));
1285#endif
1286                return HTTP_ERROR;
1287        }
1288}
1289
1290int run_one_slot(struct active_request_slot *slot,
1291                 struct slot_results *results)
1292{
1293        slot->results = results;
1294        if (!start_active_slot(slot)) {
1295                snprintf(curl_errorstr, sizeof(curl_errorstr),
1296                         "failed to start HTTP request");
1297                return HTTP_START_FAILED;
1298        }
1299
1300        run_active_slot(slot);
1301        return handle_curl_result(results);
1302}
1303
1304struct curl_slist *http_copy_default_headers(void)
1305{
1306        struct curl_slist *headers = NULL, *h;
1307
1308        for (h = extra_http_headers; h; h = h->next)
1309                headers = curl_slist_append(headers, h->data);
1310
1311        return headers;
1312}
1313
1314static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1315{
1316        char *ptr;
1317        CURLcode ret;
1318
1319        strbuf_reset(buf);
1320        ret = curl_easy_getinfo(curl, info, &ptr);
1321        if (!ret && ptr)
1322                strbuf_addstr(buf, ptr);
1323        return ret;
1324}
1325
1326/*
1327 * Check for and extract a content-type parameter. "raw"
1328 * should be positioned at the start of the potential
1329 * parameter, with any whitespace already removed.
1330 *
1331 * "name" is the name of the parameter. The value is appended
1332 * to "out".
1333 */
1334static int extract_param(const char *raw, const char *name,
1335                         struct strbuf *out)
1336{
1337        size_t len = strlen(name);
1338
1339        if (strncasecmp(raw, name, len))
1340                return -1;
1341        raw += len;
1342
1343        if (*raw != '=')
1344                return -1;
1345        raw++;
1346
1347        while (*raw && !isspace(*raw) && *raw != ';')
1348                strbuf_addch(out, *raw++);
1349        return 0;
1350}
1351
1352/*
1353 * Extract a normalized version of the content type, with any
1354 * spaces suppressed, all letters lowercased, and no trailing ";"
1355 * or parameters.
1356 *
1357 * Note that we will silently remove even invalid whitespace. For
1358 * example, "text / plain" is specifically forbidden by RFC 2616,
1359 * but "text/plain" is the only reasonable output, and this keeps
1360 * our code simple.
1361 *
1362 * If the "charset" argument is not NULL, store the value of any
1363 * charset parameter there.
1364 *
1365 * Example:
1366 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1367 *   "text / plain" -> "text/plain"
1368 */
1369static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1370                                 struct strbuf *charset)
1371{
1372        const char *p;
1373
1374        strbuf_reset(type);
1375        strbuf_grow(type, raw->len);
1376        for (p = raw->buf; *p; p++) {
1377                if (isspace(*p))
1378                        continue;
1379                if (*p == ';') {
1380                        p++;
1381                        break;
1382                }
1383                strbuf_addch(type, tolower(*p));
1384        }
1385
1386        if (!charset)
1387                return;
1388
1389        strbuf_reset(charset);
1390        while (*p) {
1391                while (isspace(*p) || *p == ';')
1392                        p++;
1393                if (!extract_param(p, "charset", charset))
1394                        return;
1395                while (*p && !isspace(*p))
1396                        p++;
1397        }
1398
1399        if (!charset->len && starts_with(type->buf, "text/"))
1400                strbuf_addstr(charset, "ISO-8859-1");
1401}
1402
1403static void write_accept_language(struct strbuf *buf)
1404{
1405        /*
1406         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1407         * that, q-value will be smaller than 0.001, the minimum q-value the
1408         * HTTP specification allows. See
1409         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1410         */
1411        const int MAX_DECIMAL_PLACES = 3;
1412        const int MAX_LANGUAGE_TAGS = 1000;
1413        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1414        char **language_tags = NULL;
1415        int num_langs = 0;
1416        const char *s = get_preferred_languages();
1417        int i;
1418        struct strbuf tag = STRBUF_INIT;
1419
1420        /* Don't add Accept-Language header if no language is preferred. */
1421        if (!s)
1422                return;
1423
1424        /*
1425         * Split the colon-separated string of preferred languages into
1426         * language_tags array.
1427         */
1428        do {
1429                /* collect language tag */
1430                for (; *s && (isalnum(*s) || *s == '_'); s++)
1431                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1432
1433                /* skip .codeset, @modifier and any other unnecessary parts */
1434                while (*s && *s != ':')
1435                        s++;
1436
1437                if (tag.len) {
1438                        num_langs++;
1439                        REALLOC_ARRAY(language_tags, num_langs);
1440                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1441                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1442                                break;
1443                }
1444        } while (*s++);
1445
1446        /* write Accept-Language header into buf */
1447        if (num_langs) {
1448                int last_buf_len = 0;
1449                int max_q;
1450                int decimal_places;
1451                char q_format[32];
1452
1453                /* add '*' */
1454                REALLOC_ARRAY(language_tags, num_langs + 1);
1455                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1456
1457                /* compute decimal_places */
1458                for (max_q = 1, decimal_places = 0;
1459                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1460                     decimal_places++, max_q *= 10)
1461                        ;
1462
1463                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1464
1465                strbuf_addstr(buf, "Accept-Language: ");
1466
1467                for (i = 0; i < num_langs; i++) {
1468                        if (i > 0)
1469                                strbuf_addstr(buf, ", ");
1470
1471                        strbuf_addstr(buf, language_tags[i]);
1472
1473                        if (i > 0)
1474                                strbuf_addf(buf, q_format, max_q - i);
1475
1476                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1477                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1478                                break;
1479                        }
1480
1481                        last_buf_len = buf->len;
1482                }
1483        }
1484
1485        /* free language tags -- last one is a static '*' */
1486        for (i = 0; i < num_langs - 1; i++)
1487                free(language_tags[i]);
1488        free(language_tags);
1489}
1490
1491/*
1492 * Get an Accept-Language header which indicates user's preferred languages.
1493 *
1494 * Examples:
1495 *   LANGUAGE= -> ""
1496 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1497 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1498 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1499 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1500 *   LANGUAGE= LANG=C -> ""
1501 */
1502static const char *get_accept_language(void)
1503{
1504        if (!cached_accept_language) {
1505                struct strbuf buf = STRBUF_INIT;
1506                write_accept_language(&buf);
1507                if (buf.len > 0)
1508                        cached_accept_language = strbuf_detach(&buf, NULL);
1509        }
1510
1511        return cached_accept_language;
1512}
1513
1514static void http_opt_request_remainder(CURL *curl, off_t pos)
1515{
1516        char buf[128];
1517        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1518        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1519}
1520
1521/* http_request() targets */
1522#define HTTP_REQUEST_STRBUF     0
1523#define HTTP_REQUEST_FILE       1
1524
1525static int http_request(const char *url,
1526                        void *result, int target,
1527                        const struct http_get_options *options)
1528{
1529        struct active_request_slot *slot;
1530        struct slot_results results;
1531        struct curl_slist *headers = http_copy_default_headers();
1532        struct strbuf buf = STRBUF_INIT;
1533        const char *accept_language;
1534        int ret;
1535
1536        slot = get_active_slot();
1537        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1538
1539        if (result == NULL) {
1540                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1541        } else {
1542                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1543                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1544
1545                if (target == HTTP_REQUEST_FILE) {
1546                        off_t posn = ftello(result);
1547                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1548                                         fwrite);
1549                        if (posn > 0)
1550                                http_opt_request_remainder(slot->curl, posn);
1551                } else
1552                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1553                                         fwrite_buffer);
1554        }
1555
1556        accept_language = get_accept_language();
1557
1558        if (accept_language)
1559                headers = curl_slist_append(headers, accept_language);
1560
1561        strbuf_addstr(&buf, "Pragma:");
1562        if (options && options->no_cache)
1563                strbuf_addstr(&buf, " no-cache");
1564        if (options && options->keep_error)
1565                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1566
1567        headers = curl_slist_append(headers, buf.buf);
1568
1569        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1570        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1571        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1572
1573        ret = run_one_slot(slot, &results);
1574
1575        if (options && options->content_type) {
1576                struct strbuf raw = STRBUF_INIT;
1577                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1578                extract_content_type(&raw, options->content_type,
1579                                     options->charset);
1580                strbuf_release(&raw);
1581        }
1582
1583        if (options && options->effective_url)
1584                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1585                                options->effective_url);
1586
1587        curl_slist_free_all(headers);
1588        strbuf_release(&buf);
1589
1590        return ret;
1591}
1592
1593/*
1594 * Update the "base" url to a more appropriate value, as deduced by
1595 * redirects seen when requesting a URL starting with "url".
1596 *
1597 * The "asked" parameter is a URL that we asked curl to access, and must begin
1598 * with "base".
1599 *
1600 * The "got" parameter is the URL that curl reported to us as where we ended
1601 * up.
1602 *
1603 * Returns 1 if we updated the base url, 0 otherwise.
1604 *
1605 * Our basic strategy is to compare "base" and "asked" to find the bits
1606 * specific to our request. We then strip those bits off of "got" to yield the
1607 * new base. So for example, if our base is "http://example.com/foo.git",
1608 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1609 * with "https://other.example.com/foo.git/info/refs". We would want the
1610 * new URL to become "https://other.example.com/foo.git".
1611 *
1612 * Note that this assumes a sane redirect scheme. It's entirely possible
1613 * in the example above to end up at a URL that does not even end in
1614 * "info/refs".  In such a case we simply punt, as there is not much we can
1615 * do (and such a scheme is unlikely to represent a real git repository,
1616 * which means we are likely about to abort anyway).
1617 */
1618static int update_url_from_redirect(struct strbuf *base,
1619                                    const char *asked,
1620                                    const struct strbuf *got)
1621{
1622        const char *tail;
1623        size_t tail_len;
1624
1625        if (!strcmp(asked, got->buf))
1626                return 0;
1627
1628        if (!skip_prefix(asked, base->buf, &tail))
1629                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1630                    asked, base->buf);
1631
1632        tail_len = strlen(tail);
1633
1634        if (got->len < tail_len ||
1635            strcmp(tail, got->buf + got->len - tail_len))
1636                return 0; /* insane redirect scheme */
1637
1638        strbuf_reset(base);
1639        strbuf_add(base, got->buf, got->len - tail_len);
1640        return 1;
1641}
1642
1643static int http_request_reauth(const char *url,
1644                               void *result, int target,
1645                               struct http_get_options *options)
1646{
1647        int ret = http_request(url, result, target, options);
1648
1649        if (options && options->effective_url && options->base_url) {
1650                if (update_url_from_redirect(options->base_url,
1651                                             url, options->effective_url)) {
1652                        credential_from_url(&http_auth, options->base_url->buf);
1653                        url = options->effective_url->buf;
1654                }
1655        }
1656
1657        if (ret != HTTP_REAUTH)
1658                return ret;
1659
1660        /*
1661         * If we are using KEEP_ERROR, the previous request may have
1662         * put cruft into our output stream; we should clear it out before
1663         * making our next request. We only know how to do this for
1664         * the strbuf case, but that is enough to satisfy current callers.
1665         */
1666        if (options && options->keep_error) {
1667                switch (target) {
1668                case HTTP_REQUEST_STRBUF:
1669                        strbuf_reset(result);
1670                        break;
1671                default:
1672                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1673                }
1674        }
1675
1676        credential_fill(&http_auth);
1677
1678        return http_request(url, result, target, options);
1679}
1680
1681int http_get_strbuf(const char *url,
1682                    struct strbuf *result,
1683                    struct http_get_options *options)
1684{
1685        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1686}
1687
1688/*
1689 * Downloads a URL and stores the result in the given file.
1690 *
1691 * If a previous interrupted download is detected (i.e. a previous temporary
1692 * file is still around) the download is resumed.
1693 */
1694static int http_get_file(const char *url, const char *filename,
1695                         struct http_get_options *options)
1696{
1697        int ret;
1698        struct strbuf tmpfile = STRBUF_INIT;
1699        FILE *result;
1700
1701        strbuf_addf(&tmpfile, "%s.temp", filename);
1702        result = fopen(tmpfile.buf, "a");
1703        if (!result) {
1704                error("Unable to open local file %s", tmpfile.buf);
1705                ret = HTTP_ERROR;
1706                goto cleanup;
1707        }
1708
1709        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1710        fclose(result);
1711
1712        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1713                ret = HTTP_ERROR;
1714cleanup:
1715        strbuf_release(&tmpfile);
1716        return ret;
1717}
1718
1719int http_fetch_ref(const char *base, struct ref *ref)
1720{
1721        struct http_get_options options = {0};
1722        char *url;
1723        struct strbuf buffer = STRBUF_INIT;
1724        int ret = -1;
1725
1726        options.no_cache = 1;
1727
1728        url = quote_ref_url(base, ref->name);
1729        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1730                strbuf_rtrim(&buffer);
1731                if (buffer.len == 40)
1732                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
1733                else if (starts_with(buffer.buf, "ref: ")) {
1734                        ref->symref = xstrdup(buffer.buf + 5);
1735                        ret = 0;
1736                }
1737        }
1738
1739        strbuf_release(&buffer);
1740        free(url);
1741        return ret;
1742}
1743
1744/* Helpers for fetching packs */
1745static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1746{
1747        char *url, *tmp;
1748        struct strbuf buf = STRBUF_INIT;
1749
1750        if (http_is_verbose)
1751                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1752
1753        end_url_with_slash(&buf, base_url);
1754        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1755        url = strbuf_detach(&buf, NULL);
1756
1757        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1758        tmp = strbuf_detach(&buf, NULL);
1759
1760        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1761                error("Unable to get pack index %s", url);
1762                free(tmp);
1763                tmp = NULL;
1764        }
1765
1766        free(url);
1767        return tmp;
1768}
1769
1770static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1771        unsigned char *sha1, const char *base_url)
1772{
1773        struct packed_git *new_pack;
1774        char *tmp_idx = NULL;
1775        int ret;
1776
1777        if (has_pack_index(sha1)) {
1778                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1779                if (!new_pack)
1780                        return -1; /* parse_pack_index() already issued error message */
1781                goto add_pack;
1782        }
1783
1784        tmp_idx = fetch_pack_index(sha1, base_url);
1785        if (!tmp_idx)
1786                return -1;
1787
1788        new_pack = parse_pack_index(sha1, tmp_idx);
1789        if (!new_pack) {
1790                unlink(tmp_idx);
1791                free(tmp_idx);
1792
1793                return -1; /* parse_pack_index() already issued error message */
1794        }
1795
1796        ret = verify_pack_index(new_pack);
1797        if (!ret) {
1798                close_pack_index(new_pack);
1799                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1800        }
1801        free(tmp_idx);
1802        if (ret)
1803                return -1;
1804
1805add_pack:
1806        new_pack->next = *packs_head;
1807        *packs_head = new_pack;
1808        return 0;
1809}
1810
1811int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1812{
1813        struct http_get_options options = {0};
1814        int ret = 0, i = 0;
1815        char *url, *data;
1816        struct strbuf buf = STRBUF_INIT;
1817        unsigned char sha1[20];
1818
1819        end_url_with_slash(&buf, base_url);
1820        strbuf_addstr(&buf, "objects/info/packs");
1821        url = strbuf_detach(&buf, NULL);
1822
1823        options.no_cache = 1;
1824        ret = http_get_strbuf(url, &buf, &options);
1825        if (ret != HTTP_OK)
1826                goto cleanup;
1827
1828        data = buf.buf;
1829        while (i < buf.len) {
1830                switch (data[i]) {
1831                case 'P':
1832                        i++;
1833                        if (i + 52 <= buf.len &&
1834                            starts_with(data + i, " pack-") &&
1835                            starts_with(data + i + 46, ".pack\n")) {
1836                                get_sha1_hex(data + i + 6, sha1);
1837                                fetch_and_setup_pack_index(packs_head, sha1,
1838                                                      base_url);
1839                                i += 51;
1840                                break;
1841                        }
1842                default:
1843                        while (i < buf.len && data[i] != '\n')
1844                                i++;
1845                }
1846                i++;
1847        }
1848
1849cleanup:
1850        free(url);
1851        return ret;
1852}
1853
1854void release_http_pack_request(struct http_pack_request *preq)
1855{
1856        if (preq->packfile != NULL) {
1857                fclose(preq->packfile);
1858                preq->packfile = NULL;
1859        }
1860        preq->slot = NULL;
1861        free(preq->url);
1862        free(preq);
1863}
1864
1865int finish_http_pack_request(struct http_pack_request *preq)
1866{
1867        struct packed_git **lst;
1868        struct packed_git *p = preq->target;
1869        char *tmp_idx;
1870        size_t len;
1871        struct child_process ip = CHILD_PROCESS_INIT;
1872        const char *ip_argv[8];
1873
1874        close_pack_index(p);
1875
1876        fclose(preq->packfile);
1877        preq->packfile = NULL;
1878
1879        lst = preq->lst;
1880        while (*lst != p)
1881                lst = &((*lst)->next);
1882        *lst = (*lst)->next;
1883
1884        if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1885                die("BUG: pack tmpfile does not end in .pack.temp?");
1886        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1887
1888        ip_argv[0] = "index-pack";
1889        ip_argv[1] = "-o";
1890        ip_argv[2] = tmp_idx;
1891        ip_argv[3] = preq->tmpfile;
1892        ip_argv[4] = NULL;
1893
1894        ip.argv = ip_argv;
1895        ip.git_cmd = 1;
1896        ip.no_stdin = 1;
1897        ip.no_stdout = 1;
1898
1899        if (run_command(&ip)) {
1900                unlink(preq->tmpfile);
1901                unlink(tmp_idx);
1902                free(tmp_idx);
1903                return -1;
1904        }
1905
1906        unlink(sha1_pack_index_name(p->sha1));
1907
1908        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1909         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1910                free(tmp_idx);
1911                return -1;
1912        }
1913
1914        install_packed_git(p);
1915        free(tmp_idx);
1916        return 0;
1917}
1918
1919struct http_pack_request *new_http_pack_request(
1920        struct packed_git *target, const char *base_url)
1921{
1922        off_t prev_posn = 0;
1923        struct strbuf buf = STRBUF_INIT;
1924        struct http_pack_request *preq;
1925
1926        preq = xcalloc(1, sizeof(*preq));
1927        preq->target = target;
1928
1929        end_url_with_slash(&buf, base_url);
1930        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1931                sha1_to_hex(target->sha1));
1932        preq->url = strbuf_detach(&buf, NULL);
1933
1934        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1935                sha1_pack_name(target->sha1));
1936        preq->packfile = fopen(preq->tmpfile, "a");
1937        if (!preq->packfile) {
1938                error("Unable to open local file %s for pack",
1939                      preq->tmpfile);
1940                goto abort;
1941        }
1942
1943        preq->slot = get_active_slot();
1944        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1945        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1946        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1947        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1948                no_pragma_header);
1949
1950        /*
1951         * If there is data present from a previous transfer attempt,
1952         * resume where it left off
1953         */
1954        prev_posn = ftello(preq->packfile);
1955        if (prev_posn>0) {
1956                if (http_is_verbose)
1957                        fprintf(stderr,
1958                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1959                                sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1960                http_opt_request_remainder(preq->slot->curl, prev_posn);
1961        }
1962
1963        return preq;
1964
1965abort:
1966        free(preq->url);
1967        free(preq);
1968        return NULL;
1969}
1970
1971/* Helpers for fetching objects (loose) */
1972static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1973                               void *data)
1974{
1975        unsigned char expn[4096];
1976        size_t size = eltsize * nmemb;
1977        int posn = 0;
1978        struct http_object_request *freq = data;
1979        struct active_request_slot *slot = freq->slot;
1980
1981        if (slot) {
1982                CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
1983                                                &slot->http_code);
1984                if (c != CURLE_OK)
1985                        die("BUG: curl_easy_getinfo for HTTP code failed: %s",
1986                                curl_easy_strerror(c));
1987                if (slot->http_code >= 400)
1988                        return size;
1989        }
1990
1991        do {
1992                ssize_t retval = xwrite(freq->localfile,
1993                                        (char *) ptr + posn, size - posn);
1994                if (retval < 0)
1995                        return posn;
1996                posn += retval;
1997        } while (posn < size);
1998
1999        freq->stream.avail_in = size;
2000        freq->stream.next_in = (void *)ptr;
2001        do {
2002                freq->stream.next_out = expn;
2003                freq->stream.avail_out = sizeof(expn);
2004                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2005                git_SHA1_Update(&freq->c, expn,
2006                                sizeof(expn) - freq->stream.avail_out);
2007        } while (freq->stream.avail_in && freq->zret == Z_OK);
2008        return size;
2009}
2010
2011struct http_object_request *new_http_object_request(const char *base_url,
2012        unsigned char *sha1)
2013{
2014        char *hex = sha1_to_hex(sha1);
2015        const char *filename;
2016        char prevfile[PATH_MAX];
2017        int prevlocal;
2018        char prev_buf[PREV_BUF_SIZE];
2019        ssize_t prev_read = 0;
2020        off_t prev_posn = 0;
2021        struct http_object_request *freq;
2022
2023        freq = xcalloc(1, sizeof(*freq));
2024        hashcpy(freq->sha1, sha1);
2025        freq->localfile = -1;
2026
2027        filename = sha1_file_name(sha1);
2028        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2029                 "%s.temp", filename);
2030
2031        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2032        unlink_or_warn(prevfile);
2033        rename(freq->tmpfile, prevfile);
2034        unlink_or_warn(freq->tmpfile);
2035
2036        if (freq->localfile != -1)
2037                error("fd leakage in start: %d", freq->localfile);
2038        freq->localfile = open(freq->tmpfile,
2039                               O_WRONLY | O_CREAT | O_EXCL, 0666);
2040        /*
2041         * This could have failed due to the "lazy directory creation";
2042         * try to mkdir the last path component.
2043         */
2044        if (freq->localfile < 0 && errno == ENOENT) {
2045                char *dir = strrchr(freq->tmpfile, '/');
2046                if (dir) {
2047                        *dir = 0;
2048                        mkdir(freq->tmpfile, 0777);
2049                        *dir = '/';
2050                }
2051                freq->localfile = open(freq->tmpfile,
2052                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
2053        }
2054
2055        if (freq->localfile < 0) {
2056                error_errno("Couldn't create temporary file %s", freq->tmpfile);
2057                goto abort;
2058        }
2059
2060        git_inflate_init(&freq->stream);
2061
2062        git_SHA1_Init(&freq->c);
2063
2064        freq->url = get_remote_object_url(base_url, hex, 0);
2065
2066        /*
2067         * If a previous temp file is present, process what was already
2068         * fetched.
2069         */
2070        prevlocal = open(prevfile, O_RDONLY);
2071        if (prevlocal != -1) {
2072                do {
2073                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2074                        if (prev_read>0) {
2075                                if (fwrite_sha1_file(prev_buf,
2076                                                     1,
2077                                                     prev_read,
2078                                                     freq) == prev_read) {
2079                                        prev_posn += prev_read;
2080                                } else {
2081                                        prev_read = -1;
2082                                }
2083                        }
2084                } while (prev_read > 0);
2085                close(prevlocal);
2086        }
2087        unlink_or_warn(prevfile);
2088
2089        /*
2090         * Reset inflate/SHA1 if there was an error reading the previous temp
2091         * file; also rewind to the beginning of the local file.
2092         */
2093        if (prev_read == -1) {
2094                memset(&freq->stream, 0, sizeof(freq->stream));
2095                git_inflate_init(&freq->stream);
2096                git_SHA1_Init(&freq->c);
2097                if (prev_posn>0) {
2098                        prev_posn = 0;
2099                        lseek(freq->localfile, 0, SEEK_SET);
2100                        if (ftruncate(freq->localfile, 0) < 0) {
2101                                error_errno("Couldn't truncate temporary file %s",
2102                                            freq->tmpfile);
2103                                goto abort;
2104                        }
2105                }
2106        }
2107
2108        freq->slot = get_active_slot();
2109
2110        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2111        curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2112        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2113        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2114        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2115        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2116
2117        /*
2118         * If we have successfully processed data from a previous fetch
2119         * attempt, only fetch the data we don't already have.
2120         */
2121        if (prev_posn>0) {
2122                if (http_is_verbose)
2123                        fprintf(stderr,
2124                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2125                                hex, (uintmax_t)prev_posn);
2126                http_opt_request_remainder(freq->slot->curl, prev_posn);
2127        }
2128
2129        return freq;
2130
2131abort:
2132        free(freq->url);
2133        free(freq);
2134        return NULL;
2135}
2136
2137void process_http_object_request(struct http_object_request *freq)
2138{
2139        if (freq->slot == NULL)
2140                return;
2141        freq->curl_result = freq->slot->curl_result;
2142        freq->http_code = freq->slot->http_code;
2143        freq->slot = NULL;
2144}
2145
2146int finish_http_object_request(struct http_object_request *freq)
2147{
2148        struct stat st;
2149
2150        close(freq->localfile);
2151        freq->localfile = -1;
2152
2153        process_http_object_request(freq);
2154
2155        if (freq->http_code == 416) {
2156                warning("requested range invalid; we may already have all the data.");
2157        } else if (freq->curl_result != CURLE_OK) {
2158                if (stat(freq->tmpfile, &st) == 0)
2159                        if (st.st_size == 0)
2160                                unlink_or_warn(freq->tmpfile);
2161                return -1;
2162        }
2163
2164        git_inflate_end(&freq->stream);
2165        git_SHA1_Final(freq->real_sha1, &freq->c);
2166        if (freq->zret != Z_STREAM_END) {
2167                unlink_or_warn(freq->tmpfile);
2168                return -1;
2169        }
2170        if (hashcmp(freq->sha1, freq->real_sha1)) {
2171                unlink_or_warn(freq->tmpfile);
2172                return -1;
2173        }
2174        freq->rename =
2175                finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2176
2177        return freq->rename;
2178}
2179
2180void abort_http_object_request(struct http_object_request *freq)
2181{
2182        unlink_or_warn(freq->tmpfile);
2183
2184        release_http_object_request(freq);
2185}
2186
2187void release_http_object_request(struct http_object_request *freq)
2188{
2189        if (freq->localfile != -1) {
2190                close(freq->localfile);
2191                freq->localfile = -1;
2192        }
2193        if (freq->url != NULL) {
2194                free(freq->url);
2195                freq->url = NULL;
2196        }
2197        if (freq->slot != NULL) {
2198                freq->slot->callback_func = NULL;
2199                freq->slot->callback_data = NULL;
2200                release_active_slot(freq->slot);
2201                freq->slot = NULL;
2202        }
2203}