Andrew's git / gitweb.git / http.c
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http.con commit imap-send.c: introduce the GIT_TRACE_CURL enviroment variable (73e57aa)
   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;
 118
 119static struct active_request_slot *active_queue_head;
 120
 121static char *cached_accept_language;
 122
 123size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 124{
 125        size_t size = eltsize * nmemb;
 126        struct buffer *buffer = buffer_;
 127
 128        if (size > buffer->buf.len - buffer->posn)
 129                size = buffer->buf.len - buffer->posn;
 130        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 131        buffer->posn += size;
 132
 133        return size;
 134}
 135
 136#ifndef NO_CURL_IOCTL
 137curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 138{
 139        struct buffer *buffer = clientp;
 140
 141        switch (cmd) {
 142        case CURLIOCMD_NOP:
 143                return CURLIOE_OK;
 144
 145        case CURLIOCMD_RESTARTREAD:
 146                buffer->posn = 0;
 147                return CURLIOE_OK;
 148
 149        default:
 150                return CURLIOE_UNKNOWNCMD;
 151        }
 152}
 153#endif
 154
 155size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 156{
 157        size_t size = eltsize * nmemb;
 158        struct strbuf *buffer = buffer_;
 159
 160        strbuf_add(buffer, ptr, size);
 161        return size;
 162}
 163
 164size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 165{
 166        return eltsize * nmemb;
 167}
 168
 169static void closedown_active_slot(struct active_request_slot *slot)
 170{
 171        active_requests--;
 172        slot->in_use = 0;
 173}
 174
 175static void finish_active_slot(struct active_request_slot *slot)
 176{
 177        closedown_active_slot(slot);
 178        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 179
 180        if (slot->finished != NULL)
 181                (*slot->finished) = 1;
 182
 183        /* Store slot results so they can be read after the slot is reused */
 184        if (slot->results != NULL) {
 185                slot->results->curl_result = slot->curl_result;
 186                slot->results->http_code = slot->http_code;
 187#if LIBCURL_VERSION_NUM >= 0x070a08
 188                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 189                                  &slot->results->auth_avail);
 190#else
 191                slot->results->auth_avail = 0;
 192#endif
 193
 194                curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 195                        &slot->results->http_connectcode);
 196        }
 197
 198        /* Run callback if appropriate */
 199        if (slot->callback_func != NULL)
 200                slot->callback_func(slot->callback_data);
 201}
 202
 203#ifdef USE_CURL_MULTI
 204static void process_curl_messages(void)
 205{
 206        int num_messages;
 207        struct active_request_slot *slot;
 208        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 209
 210        while (curl_message != NULL) {
 211                if (curl_message->msg == CURLMSG_DONE) {
 212                        int curl_result = curl_message->data.result;
 213                        slot = active_queue_head;
 214                        while (slot != NULL &&
 215                               slot->curl != curl_message->easy_handle)
 216                                slot = slot->next;
 217                        if (slot != NULL) {
 218                                curl_multi_remove_handle(curlm, slot->curl);
 219                                slot->curl_result = curl_result;
 220                                finish_active_slot(slot);
 221                        } else {
 222                                fprintf(stderr, "Received DONE message for unknown request!\n");
 223                        }
 224                } else {
 225                        fprintf(stderr, "Unknown CURL message received: %d\n",
 226                                (int)curl_message->msg);
 227                }
 228                curl_message = curl_multi_info_read(curlm, &num_messages);
 229        }
 230}
 231#endif
 232
 233static int http_options(const char *var, const char *value, void *cb)
 234{
 235        if (!strcmp("http.sslverify", var)) {
 236                curl_ssl_verify = git_config_bool(var, value);
 237                return 0;
 238        }
 239        if (!strcmp("http.sslcipherlist", var))
 240                return git_config_string(&ssl_cipherlist, var, value);
 241        if (!strcmp("http.sslversion", var))
 242                return git_config_string(&ssl_version, var, value);
 243        if (!strcmp("http.sslcert", var))
 244                return git_config_string(&ssl_cert, var, value);
 245#if LIBCURL_VERSION_NUM >= 0x070903
 246        if (!strcmp("http.sslkey", var))
 247                return git_config_string(&ssl_key, var, value);
 248#endif
 249#if LIBCURL_VERSION_NUM >= 0x070908
 250        if (!strcmp("http.sslcapath", var))
 251                return git_config_pathname(&ssl_capath, var, value);
 252#endif
 253        if (!strcmp("http.sslcainfo", var))
 254                return git_config_pathname(&ssl_cainfo, var, value);
 255        if (!strcmp("http.sslcertpasswordprotected", var)) {
 256                ssl_cert_password_required = git_config_bool(var, value);
 257                return 0;
 258        }
 259        if (!strcmp("http.ssltry", var)) {
 260                curl_ssl_try = git_config_bool(var, value);
 261                return 0;
 262        }
 263        if (!strcmp("http.minsessions", var)) {
 264                min_curl_sessions = git_config_int(var, value);
 265#ifndef USE_CURL_MULTI
 266                if (min_curl_sessions > 1)
 267                        min_curl_sessions = 1;
 268#endif
 269                return 0;
 270        }
 271#ifdef USE_CURL_MULTI
 272        if (!strcmp("http.maxrequests", var)) {
 273                max_requests = git_config_int(var, value);
 274                return 0;
 275        }
 276#endif
 277        if (!strcmp("http.lowspeedlimit", var)) {
 278                curl_low_speed_limit = (long)git_config_int(var, value);
 279                return 0;
 280        }
 281        if (!strcmp("http.lowspeedtime", var)) {
 282                curl_low_speed_time = (long)git_config_int(var, value);
 283                return 0;
 284        }
 285
 286        if (!strcmp("http.noepsv", var)) {
 287                curl_ftp_no_epsv = git_config_bool(var, value);
 288                return 0;
 289        }
 290        if (!strcmp("http.proxy", var))
 291                return git_config_string(&curl_http_proxy, var, value);
 292
 293        if (!strcmp("http.proxyauthmethod", var))
 294                return git_config_string(&http_proxy_authmethod, var, value);
 295
 296        if (!strcmp("http.cookiefile", var))
 297                return git_config_string(&curl_cookie_file, var, value);
 298        if (!strcmp("http.savecookies", var)) {
 299                curl_save_cookies = git_config_bool(var, value);
 300                return 0;
 301        }
 302
 303        if (!strcmp("http.postbuffer", var)) {
 304                http_post_buffer = git_config_int(var, value);
 305                if (http_post_buffer < LARGE_PACKET_MAX)
 306                        http_post_buffer = LARGE_PACKET_MAX;
 307                return 0;
 308        }
 309
 310        if (!strcmp("http.useragent", var))
 311                return git_config_string(&user_agent, var, value);
 312
 313        if (!strcmp("http.emptyauth", var)) {
 314                curl_empty_auth = git_config_bool(var, value);
 315                return 0;
 316        }
 317
 318        if (!strcmp("http.pinnedpubkey", var)) {
 319#if LIBCURL_VERSION_NUM >= 0x072c00
 320                return git_config_pathname(&ssl_pinnedkey, var, value);
 321#else
 322                warning(_("Public key pinning not supported with cURL < 7.44.0"));
 323                return 0;
 324#endif
 325        }
 326
 327        /* Fall back on the default ones */
 328        return git_default_config(var, value, cb);
 329}
 330
 331static void init_curl_http_auth(CURL *result)
 332{
 333        if (!http_auth.username) {
 334                if (curl_empty_auth)
 335                        curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 336                return;
 337        }
 338
 339        credential_fill(&http_auth);
 340
 341#if LIBCURL_VERSION_NUM >= 0x071301
 342        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 343        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 344#else
 345        {
 346                static struct strbuf up = STRBUF_INIT;
 347                /*
 348                 * Note that we assume we only ever have a single set of
 349                 * credentials in a given program run, so we do not have
 350                 * to worry about updating this buffer, only setting its
 351                 * initial value.
 352                 */
 353                if (!up.len)
 354                        strbuf_addf(&up, "%s:%s",
 355                                http_auth.username, http_auth.password);
 356                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 357        }
 358#endif
 359}
 360
 361/* *var must be free-able */
 362static void var_override(const char **var, char *value)
 363{
 364        if (value) {
 365                free((void *)*var);
 366                *var = xstrdup(value);
 367        }
 368}
 369
 370static void set_proxyauth_name_password(CURL *result)
 371{
 372#if LIBCURL_VERSION_NUM >= 0x071301
 373                curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 374                        proxy_auth.username);
 375                curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 376                        proxy_auth.password);
 377#else
 378                struct strbuf s = STRBUF_INIT;
 379
 380                strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 381                strbuf_addch(&s, ':');
 382                strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 383                curl_proxyuserpwd = strbuf_detach(&s, NULL);
 384                curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 385#endif
 386}
 387
 388static void init_curl_proxy_auth(CURL *result)
 389{
 390        if (proxy_auth.username) {
 391                if (!proxy_auth.password)
 392                        credential_fill(&proxy_auth);
 393                set_proxyauth_name_password(result);
 394        }
 395
 396        var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 397
 398#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 399        if (http_proxy_authmethod) {
 400                int i;
 401                for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 402                        if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 403                                curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 404                                                proxy_authmethods[i].curlauth_param);
 405                                break;
 406                        }
 407                }
 408                if (i == ARRAY_SIZE(proxy_authmethods)) {
 409                        warning("unsupported proxy authentication method %s: using anyauth",
 410                                        http_proxy_authmethod);
 411                        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 412                }
 413        }
 414        else
 415                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 416#endif
 417}
 418
 419static int has_cert_password(void)
 420{
 421        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 422                return 0;
 423        if (!cert_auth.password) {
 424                cert_auth.protocol = xstrdup("cert");
 425                cert_auth.username = xstrdup("");
 426                cert_auth.path = xstrdup(ssl_cert);
 427                credential_fill(&cert_auth);
 428        }
 429        return 1;
 430}
 431
 432#if LIBCURL_VERSION_NUM >= 0x071900
 433static void set_curl_keepalive(CURL *c)
 434{
 435        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 436}
 437
 438#elif LIBCURL_VERSION_NUM >= 0x071000
 439static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 440{
 441        int ka = 1;
 442        int rc;
 443        socklen_t len = (socklen_t)sizeof(ka);
 444
 445        if (type != CURLSOCKTYPE_IPCXN)
 446                return 0;
 447
 448        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 449        if (rc < 0)
 450                warning("unable to set SO_KEEPALIVE on socket %s",
 451                        strerror(errno));
 452
 453        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 454}
 455
 456static void set_curl_keepalive(CURL *c)
 457{
 458        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 459}
 460
 461#else
 462static void set_curl_keepalive(CURL *c)
 463{
 464        /* not supported on older curl versions */
 465}
 466#endif
 467
 468static void redact_sensitive_header(struct strbuf *header)
 469{
 470        const char *sensitive_header;
 471
 472        if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 473            skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 474                /* The first token is the type, which is OK to log */
 475                while (isspace(*sensitive_header))
 476                        sensitive_header++;
 477                while (*sensitive_header && !isspace(*sensitive_header))
 478                        sensitive_header++;
 479                /* Everything else is opaque and possibly sensitive */
 480                strbuf_setlen(header,  sensitive_header - header->buf);
 481                strbuf_addstr(header, " <redacted>");
 482        }
 483}
 484
 485static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 486{
 487        struct strbuf out = STRBUF_INIT;
 488        struct strbuf **headers, **header;
 489
 490        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 491                text, (long)size, (long)size);
 492        trace_strbuf(&trace_curl, &out);
 493        strbuf_reset(&out);
 494        strbuf_add(&out, ptr, size);
 495        headers = strbuf_split_max(&out, '\n', 0);
 496
 497        for (header = headers; *header; header++) {
 498                if (hide_sensitive_header)
 499                        redact_sensitive_header(*header);
 500                strbuf_insert((*header), 0, text, strlen(text));
 501                strbuf_insert((*header), strlen(text), ": ", 2);
 502                strbuf_rtrim((*header));
 503                strbuf_addch((*header), '\n');
 504                trace_strbuf(&trace_curl, (*header));
 505        }
 506        strbuf_list_free(headers);
 507        strbuf_release(&out);
 508}
 509
 510static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 511{
 512        size_t i;
 513        struct strbuf out = STRBUF_INIT;
 514        unsigned int width = 60;
 515
 516        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 517                text, (long)size, (long)size);
 518        trace_strbuf(&trace_curl, &out);
 519
 520        for (i = 0; i < size; i += width) {
 521                size_t w;
 522
 523                strbuf_reset(&out);
 524                strbuf_addf(&out, "%s: ", text);
 525                for (w = 0; (w < width) && (i + w < size); w++) {
 526                        unsigned char ch = ptr[i + w];
 527
 528                        strbuf_addch(&out,
 529                                       (ch >= 0x20) && (ch < 0x80)
 530                                       ? ch : '.');
 531                }
 532                strbuf_addch(&out, '\n');
 533                trace_strbuf(&trace_curl, &out);
 534        }
 535        strbuf_release(&out);
 536}
 537
 538static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 539{
 540        const char *text;
 541        enum { NO_FILTER = 0, DO_FILTER = 1 };
 542
 543        switch (type) {
 544        case CURLINFO_TEXT:
 545                trace_printf_key(&trace_curl, "== Info: %s", data);
 546        default:                /* we ignore unknown types by default */
 547                return 0;
 548
 549        case CURLINFO_HEADER_OUT:
 550                text = "=> Send header";
 551                curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 552                break;
 553        case CURLINFO_DATA_OUT:
 554                text = "=> Send data";
 555                curl_dump_data(text, (unsigned char *)data, size);
 556                break;
 557        case CURLINFO_SSL_DATA_OUT:
 558                text = "=> Send SSL data";
 559                curl_dump_data(text, (unsigned char *)data, size);
 560                break;
 561        case CURLINFO_HEADER_IN:
 562                text = "<= Recv header";
 563                curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 564                break;
 565        case CURLINFO_DATA_IN:
 566                text = "<= Recv data";
 567                curl_dump_data(text, (unsigned char *)data, size);
 568                break;
 569        case CURLINFO_SSL_DATA_IN:
 570                text = "<= Recv SSL data";
 571                curl_dump_data(text, (unsigned char *)data, size);
 572                break;
 573        }
 574        return 0;
 575}
 576
 577void setup_curl_trace(CURL *handle)
 578{
 579        if (!trace_want(&trace_curl))
 580                return;
 581        curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 582        curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 583        curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 584}
 585
 586
 587static CURL *get_curl_handle(void)
 588{
 589        CURL *result = curl_easy_init();
 590        long allowed_protocols = 0;
 591
 592        if (!result)
 593                die("curl_easy_init failed");
 594
 595        if (!curl_ssl_verify) {
 596                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 597                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 598        } else {
 599                /* Verify authenticity of the peer's certificate */
 600                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 601                /* The name in the cert must match whom we tried to connect */
 602                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 603        }
 604
 605#if LIBCURL_VERSION_NUM >= 0x070907
 606        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 607#endif
 608#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 609        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 610#endif
 611
 612        if (http_proactive_auth)
 613                init_curl_http_auth(result);
 614
 615        if (getenv("GIT_SSL_VERSION"))
 616                ssl_version = getenv("GIT_SSL_VERSION");
 617        if (ssl_version && *ssl_version) {
 618                int i;
 619                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 620                        if (!strcmp(ssl_version, sslversions[i].name)) {
 621                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 622                                                 sslversions[i].ssl_version);
 623                                break;
 624                        }
 625                }
 626                if (i == ARRAY_SIZE(sslversions))
 627                        warning("unsupported ssl version %s: using default",
 628                                ssl_version);
 629        }
 630
 631        if (getenv("GIT_SSL_CIPHER_LIST"))
 632                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 633        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 634                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 635                                ssl_cipherlist);
 636
 637        if (ssl_cert != NULL)
 638                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 639        if (has_cert_password())
 640                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 641#if LIBCURL_VERSION_NUM >= 0x070903
 642        if (ssl_key != NULL)
 643                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 644#endif
 645#if LIBCURL_VERSION_NUM >= 0x070908
 646        if (ssl_capath != NULL)
 647                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 648#endif
 649#if LIBCURL_VERSION_NUM >= 0x072c00
 650        if (ssl_pinnedkey != NULL)
 651                curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 652#endif
 653        if (ssl_cainfo != NULL)
 654                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 655
 656        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 657                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 658                                 curl_low_speed_limit);
 659                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 660                                 curl_low_speed_time);
 661        }
 662
 663        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 664        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 665#if LIBCURL_VERSION_NUM >= 0x071301
 666        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 667#elif LIBCURL_VERSION_NUM >= 0x071101
 668        curl_easy_setopt(result, CURLOPT_POST301, 1);
 669#endif
 670#if LIBCURL_VERSION_NUM >= 0x071304
 671        if (is_transport_allowed("http"))
 672                allowed_protocols |= CURLPROTO_HTTP;
 673        if (is_transport_allowed("https"))
 674                allowed_protocols |= CURLPROTO_HTTPS;
 675        if (is_transport_allowed("ftp"))
 676                allowed_protocols |= CURLPROTO_FTP;
 677        if (is_transport_allowed("ftps"))
 678                allowed_protocols |= CURLPROTO_FTPS;
 679        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 680#else
 681        if (transport_restrict_protocols())
 682                warning("protocol restrictions not applied to curl redirects because\n"
 683                        "your curl version is too old (>= 7.19.4)");
 684#endif
 685        if (getenv("GIT_CURL_VERBOSE"))
 686                curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
 687        setup_curl_trace(result);
 688
 689        curl_easy_setopt(result, CURLOPT_USERAGENT,
 690                user_agent ? user_agent : git_user_agent());
 691
 692        if (curl_ftp_no_epsv)
 693                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 694
 695#ifdef CURLOPT_USE_SSL
 696        if (curl_ssl_try)
 697                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 698#endif
 699
 700        /*
 701         * CURL also examines these variables as a fallback; but we need to query
 702         * them here in order to decide whether to prompt for missing password (cf.
 703         * init_curl_proxy_auth()).
 704         *
 705         * Unlike many other common environment variables, these are historically
 706         * lowercase only. It appears that CURL did not know this and implemented
 707         * only uppercase variants, which was later corrected to take both - with
 708         * the exception of http_proxy, which is lowercase only also in CURL. As
 709         * the lowercase versions are the historical quasi-standard, they take
 710         * precedence here, as in CURL.
 711         */
 712        if (!curl_http_proxy) {
 713                if (!strcmp(http_auth.protocol, "https")) {
 714                        var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 715                        var_override(&curl_http_proxy, getenv("https_proxy"));
 716                } else {
 717                        var_override(&curl_http_proxy, getenv("http_proxy"));
 718                }
 719                if (!curl_http_proxy) {
 720                        var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 721                        var_override(&curl_http_proxy, getenv("all_proxy"));
 722                }
 723        }
 724
 725        if (curl_http_proxy) {
 726                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 727#if LIBCURL_VERSION_NUM >= 0x071800
 728                if (starts_with(curl_http_proxy, "socks5"))
 729                        curl_easy_setopt(result,
 730                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 731                else if (starts_with(curl_http_proxy, "socks4a"))
 732                        curl_easy_setopt(result,
 733                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 734                else if (starts_with(curl_http_proxy, "socks"))
 735                        curl_easy_setopt(result,
 736                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 737#endif
 738                if (strstr(curl_http_proxy, "://"))
 739                        credential_from_url(&proxy_auth, curl_http_proxy);
 740                else {
 741                        struct strbuf url = STRBUF_INIT;
 742                        strbuf_addf(&url, "http://%s", curl_http_proxy);
 743                        credential_from_url(&proxy_auth, url.buf);
 744                        strbuf_release(&url);
 745                }
 746
 747                curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 748#if LIBCURL_VERSION_NUM >= 0x071304
 749                var_override(&curl_no_proxy, getenv("NO_PROXY"));
 750                var_override(&curl_no_proxy, getenv("no_proxy"));
 751                curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 752#endif
 753        }
 754        init_curl_proxy_auth(result);
 755
 756        set_curl_keepalive(result);
 757
 758        return result;
 759}
 760
 761static void set_from_env(const char **var, const char *envname)
 762{
 763        const char *val = getenv(envname);
 764        if (val)
 765                *var = val;
 766}
 767
 768void http_init(struct remote *remote, const char *url, int proactive_auth)
 769{
 770        char *low_speed_limit;
 771        char *low_speed_time;
 772        char *normalized_url;
 773        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 774
 775        config.section = "http";
 776        config.key = NULL;
 777        config.collect_fn = http_options;
 778        config.cascade_fn = git_default_config;
 779        config.cb = NULL;
 780
 781        http_is_verbose = 0;
 782        normalized_url = url_normalize(url, &config.url);
 783
 784        git_config(urlmatch_config_entry, &config);
 785        free(normalized_url);
 786
 787        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 788                die("curl_global_init failed");
 789
 790        http_proactive_auth = proactive_auth;
 791
 792        if (remote && remote->http_proxy)
 793                curl_http_proxy = xstrdup(remote->http_proxy);
 794
 795        if (remote)
 796                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 797
 798        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 799        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 800
 801#ifdef USE_CURL_MULTI
 802        {
 803                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 804                if (http_max_requests != NULL)
 805                        max_requests = atoi(http_max_requests);
 806        }
 807
 808        curlm = curl_multi_init();
 809        if (!curlm)
 810                die("curl_multi_init failed");
 811#endif
 812
 813        if (getenv("GIT_SSL_NO_VERIFY"))
 814                curl_ssl_verify = 0;
 815
 816        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 817#if LIBCURL_VERSION_NUM >= 0x070903
 818        set_from_env(&ssl_key, "GIT_SSL_KEY");
 819#endif
 820#if LIBCURL_VERSION_NUM >= 0x070908
 821        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 822#endif
 823        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 824
 825        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 826
 827        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 828        if (low_speed_limit != NULL)
 829                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 830        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 831        if (low_speed_time != NULL)
 832                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 833
 834        if (curl_ssl_verify == -1)
 835                curl_ssl_verify = 1;
 836
 837        curl_session_count = 0;
 838#ifdef USE_CURL_MULTI
 839        if (max_requests < 1)
 840                max_requests = DEFAULT_MAX_REQUESTS;
 841#endif
 842
 843        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 844                curl_ftp_no_epsv = 1;
 845
 846        if (url) {
 847                credential_from_url(&http_auth, url);
 848                if (!ssl_cert_password_required &&
 849                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 850                    starts_with(url, "https://"))
 851                        ssl_cert_password_required = 1;
 852        }
 853
 854#ifndef NO_CURL_EASY_DUPHANDLE
 855        curl_default = get_curl_handle();
 856#endif
 857}
 858
 859void http_cleanup(void)
 860{
 861        struct active_request_slot *slot = active_queue_head;
 862
 863        while (slot != NULL) {
 864                struct active_request_slot *next = slot->next;
 865                if (slot->curl != NULL) {
 866#ifdef USE_CURL_MULTI
 867                        curl_multi_remove_handle(curlm, slot->curl);
 868#endif
 869                        curl_easy_cleanup(slot->curl);
 870                }
 871                free(slot);
 872                slot = next;
 873        }
 874        active_queue_head = NULL;
 875
 876#ifndef NO_CURL_EASY_DUPHANDLE
 877        curl_easy_cleanup(curl_default);
 878#endif
 879
 880#ifdef USE_CURL_MULTI
 881        curl_multi_cleanup(curlm);
 882#endif
 883        curl_global_cleanup();
 884
 885        curl_slist_free_all(pragma_header);
 886        pragma_header = NULL;
 887
 888        curl_slist_free_all(no_pragma_header);
 889        no_pragma_header = NULL;
 890
 891        if (curl_http_proxy) {
 892                free((void *)curl_http_proxy);
 893                curl_http_proxy = NULL;
 894        }
 895
 896        if (proxy_auth.password) {
 897                memset(proxy_auth.password, 0, strlen(proxy_auth.password));
 898                free(proxy_auth.password);
 899                proxy_auth.password = NULL;
 900        }
 901
 902        free((void *)curl_proxyuserpwd);
 903        curl_proxyuserpwd = NULL;
 904
 905        free((void *)http_proxy_authmethod);
 906        http_proxy_authmethod = NULL;
 907
 908        if (cert_auth.password != NULL) {
 909                memset(cert_auth.password, 0, strlen(cert_auth.password));
 910                free(cert_auth.password);
 911                cert_auth.password = NULL;
 912        }
 913        ssl_cert_password_required = 0;
 914
 915        free(cached_accept_language);
 916        cached_accept_language = NULL;
 917}
 918
 919struct active_request_slot *get_active_slot(void)
 920{
 921        struct active_request_slot *slot = active_queue_head;
 922        struct active_request_slot *newslot;
 923
 924#ifdef USE_CURL_MULTI
 925        int num_transfers;
 926
 927        /* Wait for a slot to open up if the queue is full */
 928        while (active_requests >= max_requests) {
 929                curl_multi_perform(curlm, &num_transfers);
 930                if (num_transfers < active_requests)
 931                        process_curl_messages();
 932        }
 933#endif
 934
 935        while (slot != NULL && slot->in_use)
 936                slot = slot->next;
 937
 938        if (slot == NULL) {
 939                newslot = xmalloc(sizeof(*newslot));
 940                newslot->curl = NULL;
 941                newslot->in_use = 0;
 942                newslot->next = NULL;
 943
 944                slot = active_queue_head;
 945                if (slot == NULL) {
 946                        active_queue_head = newslot;
 947                } else {
 948                        while (slot->next != NULL)
 949                                slot = slot->next;
 950                        slot->next = newslot;
 951                }
 952                slot = newslot;
 953        }
 954
 955        if (slot->curl == NULL) {
 956#ifdef NO_CURL_EASY_DUPHANDLE
 957                slot->curl = get_curl_handle();
 958#else
 959                slot->curl = curl_easy_duphandle(curl_default);
 960#endif
 961                curl_session_count++;
 962        }
 963
 964        active_requests++;
 965        slot->in_use = 1;
 966        slot->results = NULL;
 967        slot->finished = NULL;
 968        slot->callback_data = NULL;
 969        slot->callback_func = NULL;
 970        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 971        if (curl_save_cookies)
 972                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 973        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 974        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 975        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 976        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 977        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 978        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 979        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 980        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 981        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 982        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
 983
 984#if LIBCURL_VERSION_NUM >= 0x070a08
 985        curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
 986#endif
 987#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 988        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 989#endif
 990        if (http_auth.password || curl_empty_auth)
 991                init_curl_http_auth(slot->curl);
 992
 993        return slot;
 994}
 995
 996int start_active_slot(struct active_request_slot *slot)
 997{
 998#ifdef USE_CURL_MULTI
 999        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1000        int num_transfers;
1001
1002        if (curlm_result != CURLM_OK &&
1003            curlm_result != CURLM_CALL_MULTI_PERFORM) {
1004                active_requests--;
1005                slot->in_use = 0;
1006                return 0;
1007        }
1008
1009        /*
1010         * We know there must be something to do, since we just added
1011         * something.
1012         */
1013        curl_multi_perform(curlm, &num_transfers);
1014#endif
1015        return 1;
1016}
1017
1018#ifdef USE_CURL_MULTI
1019struct fill_chain {
1020        void *data;
1021        int (*fill)(void *);
1022        struct fill_chain *next;
1023};
1024
1025static struct fill_chain *fill_cfg;
1026
1027void add_fill_function(void *data, int (*fill)(void *))
1028{
1029        struct fill_chain *new = xmalloc(sizeof(*new));
1030        struct fill_chain **linkp = &fill_cfg;
1031        new->data = data;
1032        new->fill = fill;
1033        new->next = NULL;
1034        while (*linkp)
1035                linkp = &(*linkp)->next;
1036        *linkp = new;
1037}
1038
1039void fill_active_slots(void)
1040{
1041        struct active_request_slot *slot = active_queue_head;
1042
1043        while (active_requests < max_requests) {
1044                struct fill_chain *fill;
1045                for (fill = fill_cfg; fill; fill = fill->next)
1046                        if (fill->fill(fill->data))
1047                                break;
1048
1049                if (!fill)
1050                        break;
1051        }
1052
1053        while (slot != NULL) {
1054                if (!slot->in_use && slot->curl != NULL
1055                        && curl_session_count > min_curl_sessions) {
1056                        curl_easy_cleanup(slot->curl);
1057                        slot->curl = NULL;
1058                        curl_session_count--;
1059                }
1060                slot = slot->next;
1061        }
1062}
1063
1064void step_active_slots(void)
1065{
1066        int num_transfers;
1067        CURLMcode curlm_result;
1068
1069        do {
1070                curlm_result = curl_multi_perform(curlm, &num_transfers);
1071        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1072        if (num_transfers < active_requests) {
1073                process_curl_messages();
1074                fill_active_slots();
1075        }
1076}
1077#endif
1078
1079void run_active_slot(struct active_request_slot *slot)
1080{
1081#ifdef USE_CURL_MULTI
1082        fd_set readfds;
1083        fd_set writefds;
1084        fd_set excfds;
1085        int max_fd;
1086        struct timeval select_timeout;
1087        int finished = 0;
1088
1089        slot->finished = &finished;
1090        while (!finished) {
1091                step_active_slots();
1092
1093                if (slot->in_use) {
1094#if LIBCURL_VERSION_NUM >= 0x070f04
1095                        long curl_timeout;
1096                        curl_multi_timeout(curlm, &curl_timeout);
1097                        if (curl_timeout == 0) {
1098                                continue;
1099                        } else if (curl_timeout == -1) {
1100                                select_timeout.tv_sec  = 0;
1101                                select_timeout.tv_usec = 50000;
1102                        } else {
1103                                select_timeout.tv_sec  =  curl_timeout / 1000;
1104                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1105                        }
1106#else
1107                        select_timeout.tv_sec  = 0;
1108                        select_timeout.tv_usec = 50000;
1109#endif
1110
1111                        max_fd = -1;
1112                        FD_ZERO(&readfds);
1113                        FD_ZERO(&writefds);
1114                        FD_ZERO(&excfds);
1115                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1116
1117                        /*
1118                         * It can happen that curl_multi_timeout returns a pathologically
1119                         * long timeout when curl_multi_fdset returns no file descriptors
1120                         * to read.  See commit message for more details.
1121                         */
1122                        if (max_fd < 0 &&
1123                            (select_timeout.tv_sec > 0 ||
1124                             select_timeout.tv_usec > 50000)) {
1125                                select_timeout.tv_sec  = 0;
1126                                select_timeout.tv_usec = 50000;
1127                        }
1128
1129                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1130                }
1131        }
1132#else
1133        while (slot->in_use) {
1134                slot->curl_result = curl_easy_perform(slot->curl);
1135                finish_active_slot(slot);
1136        }
1137#endif
1138}
1139
1140static void release_active_slot(struct active_request_slot *slot)
1141{
1142        closedown_active_slot(slot);
1143        if (slot->curl && curl_session_count > min_curl_sessions) {
1144#ifdef USE_CURL_MULTI
1145                curl_multi_remove_handle(curlm, slot->curl);
1146#endif
1147                curl_easy_cleanup(slot->curl);
1148                slot->curl = NULL;
1149                curl_session_count--;
1150        }
1151#ifdef USE_CURL_MULTI
1152        fill_active_slots();
1153#endif
1154}
1155
1156void finish_all_active_slots(void)
1157{
1158        struct active_request_slot *slot = active_queue_head;
1159
1160        while (slot != NULL)
1161                if (slot->in_use) {
1162                        run_active_slot(slot);
1163                        slot = active_queue_head;
1164                } else {
1165                        slot = slot->next;
1166                }
1167}
1168
1169/* Helpers for modifying and creating URLs */
1170static inline int needs_quote(int ch)
1171{
1172        if (((ch >= 'A') && (ch <= 'Z'))
1173                        || ((ch >= 'a') && (ch <= 'z'))
1174                        || ((ch >= '0') && (ch <= '9'))
1175                        || (ch == '/')
1176                        || (ch == '-')
1177                        || (ch == '.'))
1178                return 0;
1179        return 1;
1180}
1181
1182static char *quote_ref_url(const char *base, const char *ref)
1183{
1184        struct strbuf buf = STRBUF_INIT;
1185        const char *cp;
1186        int ch;
1187
1188        end_url_with_slash(&buf, base);
1189
1190        for (cp = ref; (ch = *cp) != 0; cp++)
1191                if (needs_quote(ch))
1192                        strbuf_addf(&buf, "%%%02x", ch);
1193                else
1194                        strbuf_addch(&buf, *cp);
1195
1196        return strbuf_detach(&buf, NULL);
1197}
1198
1199void append_remote_object_url(struct strbuf *buf, const char *url,
1200                              const char *hex,
1201                              int only_two_digit_prefix)
1202{
1203        end_url_with_slash(buf, url);
1204
1205        strbuf_addf(buf, "objects/%.*s/", 2, hex);
1206        if (!only_two_digit_prefix)
1207                strbuf_addf(buf, "%s", hex+2);
1208}
1209
1210char *get_remote_object_url(const char *url, const char *hex,
1211                            int only_two_digit_prefix)
1212{
1213        struct strbuf buf = STRBUF_INIT;
1214        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1215        return strbuf_detach(&buf, NULL);
1216}
1217
1218static int handle_curl_result(struct slot_results *results)
1219{
1220        /*
1221         * If we see a failing http code with CURLE_OK, we have turned off
1222         * FAILONERROR (to keep the server's custom error response), and should
1223         * translate the code into failure here.
1224         */
1225        if (results->curl_result == CURLE_OK &&
1226            results->http_code >= 400) {
1227                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1228                /*
1229                 * Normally curl will already have put the "reason phrase"
1230                 * from the server into curl_errorstr; unfortunately without
1231                 * FAILONERROR it is lost, so we can give only the numeric
1232                 * status code.
1233                 */
1234                snprintf(curl_errorstr, sizeof(curl_errorstr),
1235                         "The requested URL returned error: %ld",
1236                         results->http_code);
1237        }
1238
1239        if (results->curl_result == CURLE_OK) {
1240                credential_approve(&http_auth);
1241                if (proxy_auth.password)
1242                        credential_approve(&proxy_auth);
1243                return HTTP_OK;
1244        } else if (missing_target(results))
1245                return HTTP_MISSING_TARGET;
1246        else if (results->http_code == 401) {
1247                if (http_auth.username && http_auth.password) {
1248                        credential_reject(&http_auth);
1249                        return HTTP_NOAUTH;
1250                } else {
1251#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1252                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1253#endif
1254                        return HTTP_REAUTH;
1255                }
1256        } else {
1257                if (results->http_connectcode == 407)
1258                        credential_reject(&proxy_auth);
1259#if LIBCURL_VERSION_NUM >= 0x070c00
1260                if (!curl_errorstr[0])
1261                        strlcpy(curl_errorstr,
1262                                curl_easy_strerror(results->curl_result),
1263                                sizeof(curl_errorstr));
1264#endif
1265                return HTTP_ERROR;
1266        }
1267}
1268
1269int run_one_slot(struct active_request_slot *slot,
1270                 struct slot_results *results)
1271{
1272        slot->results = results;
1273        if (!start_active_slot(slot)) {
1274                snprintf(curl_errorstr, sizeof(curl_errorstr),
1275                         "failed to start HTTP request");
1276                return HTTP_START_FAILED;
1277        }
1278
1279        run_active_slot(slot);
1280        return handle_curl_result(results);
1281}
1282
1283static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1284{
1285        char *ptr;
1286        CURLcode ret;
1287
1288        strbuf_reset(buf);
1289        ret = curl_easy_getinfo(curl, info, &ptr);
1290        if (!ret && ptr)
1291                strbuf_addstr(buf, ptr);
1292        return ret;
1293}
1294
1295/*
1296 * Check for and extract a content-type parameter. "raw"
1297 * should be positioned at the start of the potential
1298 * parameter, with any whitespace already removed.
1299 *
1300 * "name" is the name of the parameter. The value is appended
1301 * to "out".
1302 */
1303static int extract_param(const char *raw, const char *name,
1304                         struct strbuf *out)
1305{
1306        size_t len = strlen(name);
1307
1308        if (strncasecmp(raw, name, len))
1309                return -1;
1310        raw += len;
1311
1312        if (*raw != '=')
1313                return -1;
1314        raw++;
1315
1316        while (*raw && !isspace(*raw) && *raw != ';')
1317                strbuf_addch(out, *raw++);
1318        return 0;
1319}
1320
1321/*
1322 * Extract a normalized version of the content type, with any
1323 * spaces suppressed, all letters lowercased, and no trailing ";"
1324 * or parameters.
1325 *
1326 * Note that we will silently remove even invalid whitespace. For
1327 * example, "text / plain" is specifically forbidden by RFC 2616,
1328 * but "text/plain" is the only reasonable output, and this keeps
1329 * our code simple.
1330 *
1331 * If the "charset" argument is not NULL, store the value of any
1332 * charset parameter there.
1333 *
1334 * Example:
1335 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1336 *   "text / plain" -> "text/plain"
1337 */
1338static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1339                                 struct strbuf *charset)
1340{
1341        const char *p;
1342
1343        strbuf_reset(type);
1344        strbuf_grow(type, raw->len);
1345        for (p = raw->buf; *p; p++) {
1346                if (isspace(*p))
1347                        continue;
1348                if (*p == ';') {
1349                        p++;
1350                        break;
1351                }
1352                strbuf_addch(type, tolower(*p));
1353        }
1354
1355        if (!charset)
1356                return;
1357
1358        strbuf_reset(charset);
1359        while (*p) {
1360                while (isspace(*p) || *p == ';')
1361                        p++;
1362                if (!extract_param(p, "charset", charset))
1363                        return;
1364                while (*p && !isspace(*p))
1365                        p++;
1366        }
1367
1368        if (!charset->len && starts_with(type->buf, "text/"))
1369                strbuf_addstr(charset, "ISO-8859-1");
1370}
1371
1372static void write_accept_language(struct strbuf *buf)
1373{
1374        /*
1375         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1376         * that, q-value will be smaller than 0.001, the minimum q-value the
1377         * HTTP specification allows. See
1378         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1379         */
1380        const int MAX_DECIMAL_PLACES = 3;
1381        const int MAX_LANGUAGE_TAGS = 1000;
1382        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1383        char **language_tags = NULL;
1384        int num_langs = 0;
1385        const char *s = get_preferred_languages();
1386        int i;
1387        struct strbuf tag = STRBUF_INIT;
1388
1389        /* Don't add Accept-Language header if no language is preferred. */
1390        if (!s)
1391                return;
1392
1393        /*
1394         * Split the colon-separated string of preferred languages into
1395         * language_tags array.
1396         */
1397        do {
1398                /* collect language tag */
1399                for (; *s && (isalnum(*s) || *s == '_'); s++)
1400                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1401
1402                /* skip .codeset, @modifier and any other unnecessary parts */
1403                while (*s && *s != ':')
1404                        s++;
1405
1406                if (tag.len) {
1407                        num_langs++;
1408                        REALLOC_ARRAY(language_tags, num_langs);
1409                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1410                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1411                                break;
1412                }
1413        } while (*s++);
1414
1415        /* write Accept-Language header into buf */
1416        if (num_langs) {
1417                int last_buf_len = 0;
1418                int max_q;
1419                int decimal_places;
1420                char q_format[32];
1421
1422                /* add '*' */
1423                REALLOC_ARRAY(language_tags, num_langs + 1);
1424                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1425
1426                /* compute decimal_places */
1427                for (max_q = 1, decimal_places = 0;
1428                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1429                     decimal_places++, max_q *= 10)
1430                        ;
1431
1432                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1433
1434                strbuf_addstr(buf, "Accept-Language: ");
1435
1436                for (i = 0; i < num_langs; i++) {
1437                        if (i > 0)
1438                                strbuf_addstr(buf, ", ");
1439
1440                        strbuf_addstr(buf, language_tags[i]);
1441
1442                        if (i > 0)
1443                                strbuf_addf(buf, q_format, max_q - i);
1444
1445                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1446                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1447                                break;
1448                        }
1449
1450                        last_buf_len = buf->len;
1451                }
1452        }
1453
1454        /* free language tags -- last one is a static '*' */
1455        for (i = 0; i < num_langs - 1; i++)
1456                free(language_tags[i]);
1457        free(language_tags);
1458}
1459
1460/*
1461 * Get an Accept-Language header which indicates user's preferred languages.
1462 *
1463 * Examples:
1464 *   LANGUAGE= -> ""
1465 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1466 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1467 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1468 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1469 *   LANGUAGE= LANG=C -> ""
1470 */
1471static const char *get_accept_language(void)
1472{
1473        if (!cached_accept_language) {
1474                struct strbuf buf = STRBUF_INIT;
1475                write_accept_language(&buf);
1476                if (buf.len > 0)
1477                        cached_accept_language = strbuf_detach(&buf, NULL);
1478        }
1479
1480        return cached_accept_language;
1481}
1482
1483static void http_opt_request_remainder(CURL *curl, off_t pos)
1484{
1485        char buf[128];
1486        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1487        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1488}
1489
1490/* http_request() targets */
1491#define HTTP_REQUEST_STRBUF     0
1492#define HTTP_REQUEST_FILE       1
1493
1494static int http_request(const char *url,
1495                        void *result, int target,
1496                        const struct http_get_options *options)
1497{
1498        struct active_request_slot *slot;
1499        struct slot_results results;
1500        struct curl_slist *headers = NULL;
1501        struct strbuf buf = STRBUF_INIT;
1502        const char *accept_language;
1503        int ret;
1504
1505        slot = get_active_slot();
1506        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1507
1508        if (result == NULL) {
1509                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1510        } else {
1511                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1512                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1513
1514                if (target == HTTP_REQUEST_FILE) {
1515                        off_t posn = ftello(result);
1516                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1517                                         fwrite);
1518                        if (posn > 0)
1519                                http_opt_request_remainder(slot->curl, posn);
1520                } else
1521                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1522                                         fwrite_buffer);
1523        }
1524
1525        accept_language = get_accept_language();
1526
1527        if (accept_language)
1528                headers = curl_slist_append(headers, accept_language);
1529
1530        strbuf_addstr(&buf, "Pragma:");
1531        if (options && options->no_cache)
1532                strbuf_addstr(&buf, " no-cache");
1533        if (options && options->keep_error)
1534                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1535
1536        headers = curl_slist_append(headers, buf.buf);
1537
1538        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1539        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1540        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1541
1542        ret = run_one_slot(slot, &results);
1543
1544        if (options && options->content_type) {
1545                struct strbuf raw = STRBUF_INIT;
1546                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1547                extract_content_type(&raw, options->content_type,
1548                                     options->charset);
1549                strbuf_release(&raw);
1550        }
1551
1552        if (options && options->effective_url)
1553                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1554                                options->effective_url);
1555
1556        curl_slist_free_all(headers);
1557        strbuf_release(&buf);
1558
1559        return ret;
1560}
1561
1562/*
1563 * Update the "base" url to a more appropriate value, as deduced by
1564 * redirects seen when requesting a URL starting with "url".
1565 *
1566 * The "asked" parameter is a URL that we asked curl to access, and must begin
1567 * with "base".
1568 *
1569 * The "got" parameter is the URL that curl reported to us as where we ended
1570 * up.
1571 *
1572 * Returns 1 if we updated the base url, 0 otherwise.
1573 *
1574 * Our basic strategy is to compare "base" and "asked" to find the bits
1575 * specific to our request. We then strip those bits off of "got" to yield the
1576 * new base. So for example, if our base is "http://example.com/foo.git",
1577 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1578 * with "https://other.example.com/foo.git/info/refs". We would want the
1579 * new URL to become "https://other.example.com/foo.git".
1580 *
1581 * Note that this assumes a sane redirect scheme. It's entirely possible
1582 * in the example above to end up at a URL that does not even end in
1583 * "info/refs".  In such a case we simply punt, as there is not much we can
1584 * do (and such a scheme is unlikely to represent a real git repository,
1585 * which means we are likely about to abort anyway).
1586 */
1587static int update_url_from_redirect(struct strbuf *base,
1588                                    const char *asked,
1589                                    const struct strbuf *got)
1590{
1591        const char *tail;
1592        size_t tail_len;
1593
1594        if (!strcmp(asked, got->buf))
1595                return 0;
1596
1597        if (!skip_prefix(asked, base->buf, &tail))
1598                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1599                    asked, base->buf);
1600
1601        tail_len = strlen(tail);
1602
1603        if (got->len < tail_len ||
1604            strcmp(tail, got->buf + got->len - tail_len))
1605                return 0; /* insane redirect scheme */
1606
1607        strbuf_reset(base);
1608        strbuf_add(base, got->buf, got->len - tail_len);
1609        return 1;
1610}
1611
1612static int http_request_reauth(const char *url,
1613                               void *result, int target,
1614                               struct http_get_options *options)
1615{
1616        int ret = http_request(url, result, target, options);
1617
1618        if (options && options->effective_url && options->base_url) {
1619                if (update_url_from_redirect(options->base_url,
1620                                             url, options->effective_url)) {
1621                        credential_from_url(&http_auth, options->base_url->buf);
1622                        url = options->effective_url->buf;
1623                }
1624        }
1625
1626        if (ret != HTTP_REAUTH)
1627                return ret;
1628
1629        /*
1630         * If we are using KEEP_ERROR, the previous request may have
1631         * put cruft into our output stream; we should clear it out before
1632         * making our next request. We only know how to do this for
1633         * the strbuf case, but that is enough to satisfy current callers.
1634         */
1635        if (options && options->keep_error) {
1636                switch (target) {
1637                case HTTP_REQUEST_STRBUF:
1638                        strbuf_reset(result);
1639                        break;
1640                default:
1641                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1642                }
1643        }
1644
1645        credential_fill(&http_auth);
1646
1647        return http_request(url, result, target, options);
1648}
1649
1650int http_get_strbuf(const char *url,
1651                    struct strbuf *result,
1652                    struct http_get_options *options)
1653{
1654        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1655}
1656
1657/*
1658 * Downloads a URL and stores the result in the given file.
1659 *
1660 * If a previous interrupted download is detected (i.e. a previous temporary
1661 * file is still around) the download is resumed.
1662 */
1663static int http_get_file(const char *url, const char *filename,
1664                         struct http_get_options *options)
1665{
1666        int ret;
1667        struct strbuf tmpfile = STRBUF_INIT;
1668        FILE *result;
1669
1670        strbuf_addf(&tmpfile, "%s.temp", filename);
1671        result = fopen(tmpfile.buf, "a");
1672        if (!result) {
1673                error("Unable to open local file %s", tmpfile.buf);
1674                ret = HTTP_ERROR;
1675                goto cleanup;
1676        }
1677
1678        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1679        fclose(result);
1680
1681        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1682                ret = HTTP_ERROR;
1683cleanup:
1684        strbuf_release(&tmpfile);
1685        return ret;
1686}
1687
1688int http_fetch_ref(const char *base, struct ref *ref)
1689{
1690        struct http_get_options options = {0};
1691        char *url;
1692        struct strbuf buffer = STRBUF_INIT;
1693        int ret = -1;
1694
1695        options.no_cache = 1;
1696
1697        url = quote_ref_url(base, ref->name);
1698        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1699                strbuf_rtrim(&buffer);
1700                if (buffer.len == 40)
1701                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
1702                else if (starts_with(buffer.buf, "ref: ")) {
1703                        ref->symref = xstrdup(buffer.buf + 5);
1704                        ret = 0;
1705                }
1706        }
1707
1708        strbuf_release(&buffer);
1709        free(url);
1710        return ret;
1711}
1712
1713/* Helpers for fetching packs */
1714static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1715{
1716        char *url, *tmp;
1717        struct strbuf buf = STRBUF_INIT;
1718
1719        if (http_is_verbose)
1720                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1721
1722        end_url_with_slash(&buf, base_url);
1723        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1724        url = strbuf_detach(&buf, NULL);
1725
1726        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1727        tmp = strbuf_detach(&buf, NULL);
1728
1729        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1730                error("Unable to get pack index %s", url);
1731                free(tmp);
1732                tmp = NULL;
1733        }
1734
1735        free(url);
1736        return tmp;
1737}
1738
1739static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1740        unsigned char *sha1, const char *base_url)
1741{
1742        struct packed_git *new_pack;
1743        char *tmp_idx = NULL;
1744        int ret;
1745
1746        if (has_pack_index(sha1)) {
1747                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1748                if (!new_pack)
1749                        return -1; /* parse_pack_index() already issued error message */
1750                goto add_pack;
1751        }
1752
1753        tmp_idx = fetch_pack_index(sha1, base_url);
1754        if (!tmp_idx)
1755                return -1;
1756
1757        new_pack = parse_pack_index(sha1, tmp_idx);
1758        if (!new_pack) {
1759                unlink(tmp_idx);
1760                free(tmp_idx);
1761
1762                return -1; /* parse_pack_index() already issued error message */
1763        }
1764
1765        ret = verify_pack_index(new_pack);
1766        if (!ret) {
1767                close_pack_index(new_pack);
1768                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1769        }
1770        free(tmp_idx);
1771        if (ret)
1772                return -1;
1773
1774add_pack:
1775        new_pack->next = *packs_head;
1776        *packs_head = new_pack;
1777        return 0;
1778}
1779
1780int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1781{
1782        struct http_get_options options = {0};
1783        int ret = 0, i = 0;
1784        char *url, *data;
1785        struct strbuf buf = STRBUF_INIT;
1786        unsigned char sha1[20];
1787
1788        end_url_with_slash(&buf, base_url);
1789        strbuf_addstr(&buf, "objects/info/packs");
1790        url = strbuf_detach(&buf, NULL);
1791
1792        options.no_cache = 1;
1793        ret = http_get_strbuf(url, &buf, &options);
1794        if (ret != HTTP_OK)
1795                goto cleanup;
1796
1797        data = buf.buf;
1798        while (i < buf.len) {
1799                switch (data[i]) {
1800                case 'P':
1801                        i++;
1802                        if (i + 52 <= buf.len &&
1803                            starts_with(data + i, " pack-") &&
1804                            starts_with(data + i + 46, ".pack\n")) {
1805                                get_sha1_hex(data + i + 6, sha1);
1806                                fetch_and_setup_pack_index(packs_head, sha1,
1807                                                      base_url);
1808                                i += 51;
1809                                break;
1810                        }
1811                default:
1812                        while (i < buf.len && data[i] != '\n')
1813                                i++;
1814                }
1815                i++;
1816        }
1817
1818cleanup:
1819        free(url);
1820        return ret;
1821}
1822
1823void release_http_pack_request(struct http_pack_request *preq)
1824{
1825        if (preq->packfile != NULL) {
1826                fclose(preq->packfile);
1827                preq->packfile = NULL;
1828        }
1829        preq->slot = NULL;
1830        free(preq->url);
1831        free(preq);
1832}
1833
1834int finish_http_pack_request(struct http_pack_request *preq)
1835{
1836        struct packed_git **lst;
1837        struct packed_git *p = preq->target;
1838        char *tmp_idx;
1839        size_t len;
1840        struct child_process ip = CHILD_PROCESS_INIT;
1841        const char *ip_argv[8];
1842
1843        close_pack_index(p);
1844
1845        fclose(preq->packfile);
1846        preq->packfile = NULL;
1847
1848        lst = preq->lst;
1849        while (*lst != p)
1850                lst = &((*lst)->next);
1851        *lst = (*lst)->next;
1852
1853        if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1854                die("BUG: pack tmpfile does not end in .pack.temp?");
1855        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1856
1857        ip_argv[0] = "index-pack";
1858        ip_argv[1] = "-o";
1859        ip_argv[2] = tmp_idx;
1860        ip_argv[3] = preq->tmpfile;
1861        ip_argv[4] = NULL;
1862
1863        ip.argv = ip_argv;
1864        ip.git_cmd = 1;
1865        ip.no_stdin = 1;
1866        ip.no_stdout = 1;
1867
1868        if (run_command(&ip)) {
1869                unlink(preq->tmpfile);
1870                unlink(tmp_idx);
1871                free(tmp_idx);
1872                return -1;
1873        }
1874
1875        unlink(sha1_pack_index_name(p->sha1));
1876
1877        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1878         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1879                free(tmp_idx);
1880                return -1;
1881        }
1882
1883        install_packed_git(p);
1884        free(tmp_idx);
1885        return 0;
1886}
1887
1888struct http_pack_request *new_http_pack_request(
1889        struct packed_git *target, const char *base_url)
1890{
1891        off_t prev_posn = 0;
1892        struct strbuf buf = STRBUF_INIT;
1893        struct http_pack_request *preq;
1894
1895        preq = xcalloc(1, sizeof(*preq));
1896        preq->target = target;
1897
1898        end_url_with_slash(&buf, base_url);
1899        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1900                sha1_to_hex(target->sha1));
1901        preq->url = strbuf_detach(&buf, NULL);
1902
1903        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1904                sha1_pack_name(target->sha1));
1905        preq->packfile = fopen(preq->tmpfile, "a");
1906        if (!preq->packfile) {
1907                error("Unable to open local file %s for pack",
1908                      preq->tmpfile);
1909                goto abort;
1910        }
1911
1912        preq->slot = get_active_slot();
1913        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1914        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1915        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1916        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1917                no_pragma_header);
1918
1919        /*
1920         * If there is data present from a previous transfer attempt,
1921         * resume where it left off
1922         */
1923        prev_posn = ftello(preq->packfile);
1924        if (prev_posn>0) {
1925                if (http_is_verbose)
1926                        fprintf(stderr,
1927                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1928                                sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1929                http_opt_request_remainder(preq->slot->curl, prev_posn);
1930        }
1931
1932        return preq;
1933
1934abort:
1935        free(preq->url);
1936        free(preq);
1937        return NULL;
1938}
1939
1940/* Helpers for fetching objects (loose) */
1941static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1942                               void *data)
1943{
1944        unsigned char expn[4096];
1945        size_t size = eltsize * nmemb;
1946        int posn = 0;
1947        struct http_object_request *freq =
1948                (struct http_object_request *)data;
1949        do {
1950                ssize_t retval = xwrite(freq->localfile,
1951                                        (char *) ptr + posn, size - posn);
1952                if (retval < 0)
1953                        return posn;
1954                posn += retval;
1955        } while (posn < size);
1956
1957        freq->stream.avail_in = size;
1958        freq->stream.next_in = (void *)ptr;
1959        do {
1960                freq->stream.next_out = expn;
1961                freq->stream.avail_out = sizeof(expn);
1962                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1963                git_SHA1_Update(&freq->c, expn,
1964                                sizeof(expn) - freq->stream.avail_out);
1965        } while (freq->stream.avail_in && freq->zret == Z_OK);
1966        return size;
1967}
1968
1969struct http_object_request *new_http_object_request(const char *base_url,
1970        unsigned char *sha1)
1971{
1972        char *hex = sha1_to_hex(sha1);
1973        const char *filename;
1974        char prevfile[PATH_MAX];
1975        int prevlocal;
1976        char prev_buf[PREV_BUF_SIZE];
1977        ssize_t prev_read = 0;
1978        off_t prev_posn = 0;
1979        struct http_object_request *freq;
1980
1981        freq = xcalloc(1, sizeof(*freq));
1982        hashcpy(freq->sha1, sha1);
1983        freq->localfile = -1;
1984
1985        filename = sha1_file_name(sha1);
1986        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1987                 "%s.temp", filename);
1988
1989        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1990        unlink_or_warn(prevfile);
1991        rename(freq->tmpfile, prevfile);
1992        unlink_or_warn(freq->tmpfile);
1993
1994        if (freq->localfile != -1)
1995                error("fd leakage in start: %d", freq->localfile);
1996        freq->localfile = open(freq->tmpfile,
1997                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1998        /*
1999         * This could have failed due to the "lazy directory creation";
2000         * try to mkdir the last path component.
2001         */
2002        if (freq->localfile < 0 && errno == ENOENT) {
2003                char *dir = strrchr(freq->tmpfile, '/');
2004                if (dir) {
2005                        *dir = 0;
2006                        mkdir(freq->tmpfile, 0777);
2007                        *dir = '/';
2008                }
2009                freq->localfile = open(freq->tmpfile,
2010                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
2011        }
2012
2013        if (freq->localfile < 0) {
2014                error("Couldn't create temporary file %s: %s",
2015                      freq->tmpfile, strerror(errno));
2016                goto abort;
2017        }
2018
2019        git_inflate_init(&freq->stream);
2020
2021        git_SHA1_Init(&freq->c);
2022
2023        freq->url = get_remote_object_url(base_url, hex, 0);
2024
2025        /*
2026         * If a previous temp file is present, process what was already
2027         * fetched.
2028         */
2029        prevlocal = open(prevfile, O_RDONLY);
2030        if (prevlocal != -1) {
2031                do {
2032                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2033                        if (prev_read>0) {
2034                                if (fwrite_sha1_file(prev_buf,
2035                                                     1,
2036                                                     prev_read,
2037                                                     freq) == prev_read) {
2038                                        prev_posn += prev_read;
2039                                } else {
2040                                        prev_read = -1;
2041                                }
2042                        }
2043                } while (prev_read > 0);
2044                close(prevlocal);
2045        }
2046        unlink_or_warn(prevfile);
2047
2048        /*
2049         * Reset inflate/SHA1 if there was an error reading the previous temp
2050         * file; also rewind to the beginning of the local file.
2051         */
2052        if (prev_read == -1) {
2053                memset(&freq->stream, 0, sizeof(freq->stream));
2054                git_inflate_init(&freq->stream);
2055                git_SHA1_Init(&freq->c);
2056                if (prev_posn>0) {
2057                        prev_posn = 0;
2058                        lseek(freq->localfile, 0, SEEK_SET);
2059                        if (ftruncate(freq->localfile, 0) < 0) {
2060                                error("Couldn't truncate temporary file %s: %s",
2061                                          freq->tmpfile, strerror(errno));
2062                                goto abort;
2063                        }
2064                }
2065        }
2066
2067        freq->slot = get_active_slot();
2068
2069        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2070        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2071        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2072        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2073        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2074
2075        /*
2076         * If we have successfully processed data from a previous fetch
2077         * attempt, only fetch the data we don't already have.
2078         */
2079        if (prev_posn>0) {
2080                if (http_is_verbose)
2081                        fprintf(stderr,
2082                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2083                                hex, (uintmax_t)prev_posn);
2084                http_opt_request_remainder(freq->slot->curl, prev_posn);
2085        }
2086
2087        return freq;
2088
2089abort:
2090        free(freq->url);
2091        free(freq);
2092        return NULL;
2093}
2094
2095void process_http_object_request(struct http_object_request *freq)
2096{
2097        if (freq->slot == NULL)
2098                return;
2099        freq->curl_result = freq->slot->curl_result;
2100        freq->http_code = freq->slot->http_code;
2101        freq->slot = NULL;
2102}
2103
2104int finish_http_object_request(struct http_object_request *freq)
2105{
2106        struct stat st;
2107
2108        close(freq->localfile);
2109        freq->localfile = -1;
2110
2111        process_http_object_request(freq);
2112
2113        if (freq->http_code == 416) {
2114                warning("requested range invalid; we may already have all the data.");
2115        } else if (freq->curl_result != CURLE_OK) {
2116                if (stat(freq->tmpfile, &st) == 0)
2117                        if (st.st_size == 0)
2118                                unlink_or_warn(freq->tmpfile);
2119                return -1;
2120        }
2121
2122        git_inflate_end(&freq->stream);
2123        git_SHA1_Final(freq->real_sha1, &freq->c);
2124        if (freq->zret != Z_STREAM_END) {
2125                unlink_or_warn(freq->tmpfile);
2126                return -1;
2127        }
2128        if (hashcmp(freq->sha1, freq->real_sha1)) {
2129                unlink_or_warn(freq->tmpfile);
2130                return -1;
2131        }
2132        freq->rename =
2133                finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2134
2135        return freq->rename;
2136}
2137
2138void abort_http_object_request(struct http_object_request *freq)
2139{
2140        unlink_or_warn(freq->tmpfile);
2141
2142        release_http_object_request(freq);
2143}
2144
2145void release_http_object_request(struct http_object_request *freq)
2146{
2147        if (freq->localfile != -1) {
2148                close(freq->localfile);
2149                freq->localfile = -1;
2150        }
2151        if (freq->url != NULL) {
2152                free(freq->url);
2153                freq->url = NULL;
2154        }
2155        if (freq->slot != NULL) {
2156                freq->slot->callback_func = NULL;
2157                freq->slot->callback_data = NULL;
2158                release_active_slot(freq->slot);
2159                freq->slot = NULL;
2160        }
2161}