Andrew's git / gitweb.git / http.c
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http.con commit Merge branch 'js/prepare-sequencer' (7f1dc9f)
   1#include "git-compat-util.h"
   2#include "http.h"
   3#include "pack.h"
   4#include "sideband.h"
   5#include "run-command.h"
   6#include "url.h"
   7#include "urlmatch.h"
   8#include "credential.h"
   9#include "version.h"
  10#include "pkt-line.h"
  11#include "gettext.h"
  12#include "transport.h"
  13
  14static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
  15#if LIBCURL_VERSION_NUM >= 0x070a08
  16long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  17#else
  18long int git_curl_ipresolve;
  19#endif
  20int active_requests;
  21int http_is_verbose;
  22size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  23
  24#if LIBCURL_VERSION_NUM >= 0x070a06
  25#define LIBCURL_CAN_HANDLE_AUTH_ANY
  26#endif
  27
  28static int min_curl_sessions = 1;
  29static int curl_session_count;
  30#ifdef USE_CURL_MULTI
  31static int max_requests = -1;
  32static CURLM *curlm;
  33#endif
  34#ifndef NO_CURL_EASY_DUPHANDLE
  35static CURL *curl_default;
  36#endif
  37
  38#define PREV_BUF_SIZE 4096
  39
  40char curl_errorstr[CURL_ERROR_SIZE];
  41
  42static int curl_ssl_verify = -1;
  43static int curl_ssl_try;
  44static const char *ssl_cert;
  45static const char *ssl_cipherlist;
  46static const char *ssl_version;
  47static struct {
  48        const char *name;
  49        long ssl_version;
  50} sslversions[] = {
  51        { "sslv2", CURL_SSLVERSION_SSLv2 },
  52        { "sslv3", CURL_SSLVERSION_SSLv3 },
  53        { "tlsv1", CURL_SSLVERSION_TLSv1 },
  54#if LIBCURL_VERSION_NUM >= 0x072200
  55        { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  56        { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  57        { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  58#endif
  59};
  60#if LIBCURL_VERSION_NUM >= 0x070903
  61static const char *ssl_key;
  62#endif
  63#if LIBCURL_VERSION_NUM >= 0x070908
  64static const char *ssl_capath;
  65#endif
  66#if LIBCURL_VERSION_NUM >= 0x072c00
  67static const char *ssl_pinnedkey;
  68#endif
  69static const char *ssl_cainfo;
  70static long curl_low_speed_limit = -1;
  71static long curl_low_speed_time = -1;
  72static int curl_ftp_no_epsv;
  73static const char *curl_http_proxy;
  74static const char *curl_no_proxy;
  75static const char *http_proxy_authmethod;
  76static struct {
  77        const char *name;
  78        long curlauth_param;
  79} proxy_authmethods[] = {
  80        { "basic", CURLAUTH_BASIC },
  81        { "digest", CURLAUTH_DIGEST },
  82        { "negotiate", CURLAUTH_GSSNEGOTIATE },
  83        { "ntlm", CURLAUTH_NTLM },
  84#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  85        { "anyauth", CURLAUTH_ANY },
  86#endif
  87        /*
  88         * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  89         * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  90         * here, too
  91         */
  92};
  93#if LIBCURL_VERSION_NUM >= 0x071600
  94static const char *curl_deleg;
  95static struct {
  96        const char *name;
  97        long curl_deleg_param;
  98} curl_deleg_levels[] = {
  99        { "none", CURLGSSAPI_DELEGATION_NONE },
 100        { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
 101        { "always", CURLGSSAPI_DELEGATION_FLAG },
 102};
 103#endif
 104
 105static struct credential proxy_auth = CREDENTIAL_INIT;
 106static const char *curl_proxyuserpwd;
 107static const char *curl_cookie_file;
 108static int curl_save_cookies;
 109struct credential http_auth = CREDENTIAL_INIT;
 110static int http_proactive_auth;
 111static const char *user_agent;
 112static int curl_empty_auth;
 113
 114#if LIBCURL_VERSION_NUM >= 0x071700
 115/* Use CURLOPT_KEYPASSWD as is */
 116#elif LIBCURL_VERSION_NUM >= 0x070903
 117#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 118#else
 119#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 120#endif
 121
 122static struct credential cert_auth = CREDENTIAL_INIT;
 123static int ssl_cert_password_required;
 124#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 125static unsigned long http_auth_methods = CURLAUTH_ANY;
 126#endif
 127
 128static struct curl_slist *pragma_header;
 129static struct curl_slist *no_pragma_header;
 130static struct curl_slist *extra_http_headers;
 131
 132static struct active_request_slot *active_queue_head;
 133
 134static char *cached_accept_language;
 135
 136size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 137{
 138        size_t size = eltsize * nmemb;
 139        struct buffer *buffer = buffer_;
 140
 141        if (size > buffer->buf.len - buffer->posn)
 142                size = buffer->buf.len - buffer->posn;
 143        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 144        buffer->posn += size;
 145
 146        return size;
 147}
 148
 149#ifndef NO_CURL_IOCTL
 150curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 151{
 152        struct buffer *buffer = clientp;
 153
 154        switch (cmd) {
 155        case CURLIOCMD_NOP:
 156                return CURLIOE_OK;
 157
 158        case CURLIOCMD_RESTARTREAD:
 159                buffer->posn = 0;
 160                return CURLIOE_OK;
 161
 162        default:
 163                return CURLIOE_UNKNOWNCMD;
 164        }
 165}
 166#endif
 167
 168size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 169{
 170        size_t size = eltsize * nmemb;
 171        struct strbuf *buffer = buffer_;
 172
 173        strbuf_add(buffer, ptr, size);
 174        return size;
 175}
 176
 177size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 178{
 179        return eltsize * nmemb;
 180}
 181
 182static void closedown_active_slot(struct active_request_slot *slot)
 183{
 184        active_requests--;
 185        slot->in_use = 0;
 186}
 187
 188static void finish_active_slot(struct active_request_slot *slot)
 189{
 190        closedown_active_slot(slot);
 191        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 192
 193        if (slot->finished != NULL)
 194                (*slot->finished) = 1;
 195
 196        /* Store slot results so they can be read after the slot is reused */
 197        if (slot->results != NULL) {
 198                slot->results->curl_result = slot->curl_result;
 199                slot->results->http_code = slot->http_code;
 200#if LIBCURL_VERSION_NUM >= 0x070a08
 201                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 202                                  &slot->results->auth_avail);
 203#else
 204                slot->results->auth_avail = 0;
 205#endif
 206
 207                curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 208                        &slot->results->http_connectcode);
 209        }
 210
 211        /* Run callback if appropriate */
 212        if (slot->callback_func != NULL)
 213                slot->callback_func(slot->callback_data);
 214}
 215
 216static void xmulti_remove_handle(struct active_request_slot *slot)
 217{
 218#ifdef USE_CURL_MULTI
 219        curl_multi_remove_handle(curlm, slot->curl);
 220#endif
 221}
 222
 223#ifdef USE_CURL_MULTI
 224static void process_curl_messages(void)
 225{
 226        int num_messages;
 227        struct active_request_slot *slot;
 228        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 229
 230        while (curl_message != NULL) {
 231                if (curl_message->msg == CURLMSG_DONE) {
 232                        int curl_result = curl_message->data.result;
 233                        slot = active_queue_head;
 234                        while (slot != NULL &&
 235                               slot->curl != curl_message->easy_handle)
 236                                slot = slot->next;
 237                        if (slot != NULL) {
 238                                xmulti_remove_handle(slot);
 239                                slot->curl_result = curl_result;
 240                                finish_active_slot(slot);
 241                        } else {
 242                                fprintf(stderr, "Received DONE message for unknown request!\n");
 243                        }
 244                } else {
 245                        fprintf(stderr, "Unknown CURL message received: %d\n",
 246                                (int)curl_message->msg);
 247                }
 248                curl_message = curl_multi_info_read(curlm, &num_messages);
 249        }
 250}
 251#endif
 252
 253static int http_options(const char *var, const char *value, void *cb)
 254{
 255        if (!strcmp("http.sslverify", var)) {
 256                curl_ssl_verify = git_config_bool(var, value);
 257                return 0;
 258        }
 259        if (!strcmp("http.sslcipherlist", var))
 260                return git_config_string(&ssl_cipherlist, var, value);
 261        if (!strcmp("http.sslversion", var))
 262                return git_config_string(&ssl_version, var, value);
 263        if (!strcmp("http.sslcert", var))
 264                return git_config_string(&ssl_cert, var, value);
 265#if LIBCURL_VERSION_NUM >= 0x070903
 266        if (!strcmp("http.sslkey", var))
 267                return git_config_string(&ssl_key, var, value);
 268#endif
 269#if LIBCURL_VERSION_NUM >= 0x070908
 270        if (!strcmp("http.sslcapath", var))
 271                return git_config_pathname(&ssl_capath, var, value);
 272#endif
 273        if (!strcmp("http.sslcainfo", var))
 274                return git_config_pathname(&ssl_cainfo, var, value);
 275        if (!strcmp("http.sslcertpasswordprotected", var)) {
 276                ssl_cert_password_required = git_config_bool(var, value);
 277                return 0;
 278        }
 279        if (!strcmp("http.ssltry", var)) {
 280                curl_ssl_try = git_config_bool(var, value);
 281                return 0;
 282        }
 283        if (!strcmp("http.minsessions", var)) {
 284                min_curl_sessions = git_config_int(var, value);
 285#ifndef USE_CURL_MULTI
 286                if (min_curl_sessions > 1)
 287                        min_curl_sessions = 1;
 288#endif
 289                return 0;
 290        }
 291#ifdef USE_CURL_MULTI
 292        if (!strcmp("http.maxrequests", var)) {
 293                max_requests = git_config_int(var, value);
 294                return 0;
 295        }
 296#endif
 297        if (!strcmp("http.lowspeedlimit", var)) {
 298                curl_low_speed_limit = (long)git_config_int(var, value);
 299                return 0;
 300        }
 301        if (!strcmp("http.lowspeedtime", var)) {
 302                curl_low_speed_time = (long)git_config_int(var, value);
 303                return 0;
 304        }
 305
 306        if (!strcmp("http.noepsv", var)) {
 307                curl_ftp_no_epsv = git_config_bool(var, value);
 308                return 0;
 309        }
 310        if (!strcmp("http.proxy", var))
 311                return git_config_string(&curl_http_proxy, var, value);
 312
 313        if (!strcmp("http.proxyauthmethod", var))
 314                return git_config_string(&http_proxy_authmethod, var, value);
 315
 316        if (!strcmp("http.cookiefile", var))
 317                return git_config_pathname(&curl_cookie_file, var, value);
 318        if (!strcmp("http.savecookies", var)) {
 319                curl_save_cookies = git_config_bool(var, value);
 320                return 0;
 321        }
 322
 323        if (!strcmp("http.postbuffer", var)) {
 324                http_post_buffer = git_config_int(var, value);
 325                if (http_post_buffer < LARGE_PACKET_MAX)
 326                        http_post_buffer = LARGE_PACKET_MAX;
 327                return 0;
 328        }
 329
 330        if (!strcmp("http.useragent", var))
 331                return git_config_string(&user_agent, var, value);
 332
 333        if (!strcmp("http.emptyauth", var)) {
 334                curl_empty_auth = git_config_bool(var, value);
 335                return 0;
 336        }
 337
 338        if (!strcmp("http.delegation", var)) {
 339#if LIBCURL_VERSION_NUM >= 0x071600
 340                return git_config_string(&curl_deleg, var, value);
 341#else
 342                warning(_("Delegation control is not supported with cURL < 7.22.0"));
 343                return 0;
 344#endif
 345        }
 346
 347        if (!strcmp("http.pinnedpubkey", var)) {
 348#if LIBCURL_VERSION_NUM >= 0x072c00
 349                return git_config_pathname(&ssl_pinnedkey, var, value);
 350#else
 351                warning(_("Public key pinning not supported with cURL < 7.44.0"));
 352                return 0;
 353#endif
 354        }
 355
 356        if (!strcmp("http.extraheader", var)) {
 357                if (!value) {
 358                        return config_error_nonbool(var);
 359                } else if (!*value) {
 360                        curl_slist_free_all(extra_http_headers);
 361                        extra_http_headers = NULL;
 362                } else {
 363                        extra_http_headers =
 364                                curl_slist_append(extra_http_headers, value);
 365                }
 366                return 0;
 367        }
 368
 369        /* Fall back on the default ones */
 370        return git_default_config(var, value, cb);
 371}
 372
 373static void init_curl_http_auth(CURL *result)
 374{
 375        if (!http_auth.username || !*http_auth.username) {
 376                if (curl_empty_auth)
 377                        curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 378                return;
 379        }
 380
 381        credential_fill(&http_auth);
 382
 383#if LIBCURL_VERSION_NUM >= 0x071301
 384        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 385        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 386#else
 387        {
 388                static struct strbuf up = STRBUF_INIT;
 389                /*
 390                 * Note that we assume we only ever have a single set of
 391                 * credentials in a given program run, so we do not have
 392                 * to worry about updating this buffer, only setting its
 393                 * initial value.
 394                 */
 395                if (!up.len)
 396                        strbuf_addf(&up, "%s:%s",
 397                                http_auth.username, http_auth.password);
 398                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 399        }
 400#endif
 401}
 402
 403/* *var must be free-able */
 404static void var_override(const char **var, char *value)
 405{
 406        if (value) {
 407                free((void *)*var);
 408                *var = xstrdup(value);
 409        }
 410}
 411
 412static void set_proxyauth_name_password(CURL *result)
 413{
 414#if LIBCURL_VERSION_NUM >= 0x071301
 415                curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 416                        proxy_auth.username);
 417                curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 418                        proxy_auth.password);
 419#else
 420                struct strbuf s = STRBUF_INIT;
 421
 422                strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 423                strbuf_addch(&s, ':');
 424                strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 425                curl_proxyuserpwd = strbuf_detach(&s, NULL);
 426                curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 427#endif
 428}
 429
 430static void init_curl_proxy_auth(CURL *result)
 431{
 432        if (proxy_auth.username) {
 433                if (!proxy_auth.password)
 434                        credential_fill(&proxy_auth);
 435                set_proxyauth_name_password(result);
 436        }
 437
 438        var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 439
 440#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 441        if (http_proxy_authmethod) {
 442                int i;
 443                for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 444                        if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 445                                curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 446                                                proxy_authmethods[i].curlauth_param);
 447                                break;
 448                        }
 449                }
 450                if (i == ARRAY_SIZE(proxy_authmethods)) {
 451                        warning("unsupported proxy authentication method %s: using anyauth",
 452                                        http_proxy_authmethod);
 453                        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 454                }
 455        }
 456        else
 457                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 458#endif
 459}
 460
 461static int has_cert_password(void)
 462{
 463        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 464                return 0;
 465        if (!cert_auth.password) {
 466                cert_auth.protocol = xstrdup("cert");
 467                cert_auth.username = xstrdup("");
 468                cert_auth.path = xstrdup(ssl_cert);
 469                credential_fill(&cert_auth);
 470        }
 471        return 1;
 472}
 473
 474#if LIBCURL_VERSION_NUM >= 0x071900
 475static void set_curl_keepalive(CURL *c)
 476{
 477        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 478}
 479
 480#elif LIBCURL_VERSION_NUM >= 0x071000
 481static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 482{
 483        int ka = 1;
 484        int rc;
 485        socklen_t len = (socklen_t)sizeof(ka);
 486
 487        if (type != CURLSOCKTYPE_IPCXN)
 488                return 0;
 489
 490        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 491        if (rc < 0)
 492                warning_errno("unable to set SO_KEEPALIVE on socket");
 493
 494        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 495}
 496
 497static void set_curl_keepalive(CURL *c)
 498{
 499        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 500}
 501
 502#else
 503static void set_curl_keepalive(CURL *c)
 504{
 505        /* not supported on older curl versions */
 506}
 507#endif
 508
 509static void redact_sensitive_header(struct strbuf *header)
 510{
 511        const char *sensitive_header;
 512
 513        if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 514            skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 515                /* The first token is the type, which is OK to log */
 516                while (isspace(*sensitive_header))
 517                        sensitive_header++;
 518                while (*sensitive_header && !isspace(*sensitive_header))
 519                        sensitive_header++;
 520                /* Everything else is opaque and possibly sensitive */
 521                strbuf_setlen(header,  sensitive_header - header->buf);
 522                strbuf_addstr(header, " <redacted>");
 523        }
 524}
 525
 526static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 527{
 528        struct strbuf out = STRBUF_INIT;
 529        struct strbuf **headers, **header;
 530
 531        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 532                text, (long)size, (long)size);
 533        trace_strbuf(&trace_curl, &out);
 534        strbuf_reset(&out);
 535        strbuf_add(&out, ptr, size);
 536        headers = strbuf_split_max(&out, '\n', 0);
 537
 538        for (header = headers; *header; header++) {
 539                if (hide_sensitive_header)
 540                        redact_sensitive_header(*header);
 541                strbuf_insert((*header), 0, text, strlen(text));
 542                strbuf_insert((*header), strlen(text), ": ", 2);
 543                strbuf_rtrim((*header));
 544                strbuf_addch((*header), '\n');
 545                trace_strbuf(&trace_curl, (*header));
 546        }
 547        strbuf_list_free(headers);
 548        strbuf_release(&out);
 549}
 550
 551static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 552{
 553        size_t i;
 554        struct strbuf out = STRBUF_INIT;
 555        unsigned int width = 60;
 556
 557        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 558                text, (long)size, (long)size);
 559        trace_strbuf(&trace_curl, &out);
 560
 561        for (i = 0; i < size; i += width) {
 562                size_t w;
 563
 564                strbuf_reset(&out);
 565                strbuf_addf(&out, "%s: ", text);
 566                for (w = 0; (w < width) && (i + w < size); w++) {
 567                        unsigned char ch = ptr[i + w];
 568
 569                        strbuf_addch(&out,
 570                                       (ch >= 0x20) && (ch < 0x80)
 571                                       ? ch : '.');
 572                }
 573                strbuf_addch(&out, '\n');
 574                trace_strbuf(&trace_curl, &out);
 575        }
 576        strbuf_release(&out);
 577}
 578
 579static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 580{
 581        const char *text;
 582        enum { NO_FILTER = 0, DO_FILTER = 1 };
 583
 584        switch (type) {
 585        case CURLINFO_TEXT:
 586                trace_printf_key(&trace_curl, "== Info: %s", data);
 587        default:                /* we ignore unknown types by default */
 588                return 0;
 589
 590        case CURLINFO_HEADER_OUT:
 591                text = "=> Send header";
 592                curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 593                break;
 594        case CURLINFO_DATA_OUT:
 595                text = "=> Send data";
 596                curl_dump_data(text, (unsigned char *)data, size);
 597                break;
 598        case CURLINFO_SSL_DATA_OUT:
 599                text = "=> Send SSL data";
 600                curl_dump_data(text, (unsigned char *)data, size);
 601                break;
 602        case CURLINFO_HEADER_IN:
 603                text = "<= Recv header";
 604                curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 605                break;
 606        case CURLINFO_DATA_IN:
 607                text = "<= Recv data";
 608                curl_dump_data(text, (unsigned char *)data, size);
 609                break;
 610        case CURLINFO_SSL_DATA_IN:
 611                text = "<= Recv SSL data";
 612                curl_dump_data(text, (unsigned char *)data, size);
 613                break;
 614        }
 615        return 0;
 616}
 617
 618void setup_curl_trace(CURL *handle)
 619{
 620        if (!trace_want(&trace_curl))
 621                return;
 622        curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 623        curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 624        curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 625}
 626
 627
 628static CURL *get_curl_handle(void)
 629{
 630        CURL *result = curl_easy_init();
 631        long allowed_protocols = 0;
 632
 633        if (!result)
 634                die("curl_easy_init failed");
 635
 636        if (!curl_ssl_verify) {
 637                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 638                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 639        } else {
 640                /* Verify authenticity of the peer's certificate */
 641                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 642                /* The name in the cert must match whom we tried to connect */
 643                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 644        }
 645
 646#if LIBCURL_VERSION_NUM >= 0x070907
 647        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 648#endif
 649#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 650        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 651#endif
 652
 653#if LIBCURL_VERSION_NUM >= 0x071600
 654        if (curl_deleg) {
 655                int i;
 656                for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
 657                        if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
 658                                curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
 659                                                curl_deleg_levels[i].curl_deleg_param);
 660                                break;
 661                        }
 662                }
 663                if (i == ARRAY_SIZE(curl_deleg_levels))
 664                        warning("Unknown delegation method '%s': using default",
 665                                curl_deleg);
 666        }
 667#endif
 668
 669        if (http_proactive_auth)
 670                init_curl_http_auth(result);
 671
 672        if (getenv("GIT_SSL_VERSION"))
 673                ssl_version = getenv("GIT_SSL_VERSION");
 674        if (ssl_version && *ssl_version) {
 675                int i;
 676                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 677                        if (!strcmp(ssl_version, sslversions[i].name)) {
 678                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 679                                                 sslversions[i].ssl_version);
 680                                break;
 681                        }
 682                }
 683                if (i == ARRAY_SIZE(sslversions))
 684                        warning("unsupported ssl version %s: using default",
 685                                ssl_version);
 686        }
 687
 688        if (getenv("GIT_SSL_CIPHER_LIST"))
 689                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 690        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 691                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 692                                ssl_cipherlist);
 693
 694        if (ssl_cert != NULL)
 695                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 696        if (has_cert_password())
 697                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 698#if LIBCURL_VERSION_NUM >= 0x070903
 699        if (ssl_key != NULL)
 700                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 701#endif
 702#if LIBCURL_VERSION_NUM >= 0x070908
 703        if (ssl_capath != NULL)
 704                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 705#endif
 706#if LIBCURL_VERSION_NUM >= 0x072c00
 707        if (ssl_pinnedkey != NULL)
 708                curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 709#endif
 710        if (ssl_cainfo != NULL)
 711                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 712
 713        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 714                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 715                                 curl_low_speed_limit);
 716                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 717                                 curl_low_speed_time);
 718        }
 719
 720        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 721        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 722#if LIBCURL_VERSION_NUM >= 0x071301
 723        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 724#elif LIBCURL_VERSION_NUM >= 0x071101
 725        curl_easy_setopt(result, CURLOPT_POST301, 1);
 726#endif
 727#if LIBCURL_VERSION_NUM >= 0x071304
 728        if (is_transport_allowed("http"))
 729                allowed_protocols |= CURLPROTO_HTTP;
 730        if (is_transport_allowed("https"))
 731                allowed_protocols |= CURLPROTO_HTTPS;
 732        if (is_transport_allowed("ftp"))
 733                allowed_protocols |= CURLPROTO_FTP;
 734        if (is_transport_allowed("ftps"))
 735                allowed_protocols |= CURLPROTO_FTPS;
 736        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 737#else
 738        if (transport_restrict_protocols())
 739                warning("protocol restrictions not applied to curl redirects because\n"
 740                        "your curl version is too old (>= 7.19.4)");
 741#endif
 742        if (getenv("GIT_CURL_VERBOSE"))
 743                curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
 744        setup_curl_trace(result);
 745
 746        curl_easy_setopt(result, CURLOPT_USERAGENT,
 747                user_agent ? user_agent : git_user_agent());
 748
 749        if (curl_ftp_no_epsv)
 750                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 751
 752#ifdef CURLOPT_USE_SSL
 753        if (curl_ssl_try)
 754                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 755#endif
 756
 757        /*
 758         * CURL also examines these variables as a fallback; but we need to query
 759         * them here in order to decide whether to prompt for missing password (cf.
 760         * init_curl_proxy_auth()).
 761         *
 762         * Unlike many other common environment variables, these are historically
 763         * lowercase only. It appears that CURL did not know this and implemented
 764         * only uppercase variants, which was later corrected to take both - with
 765         * the exception of http_proxy, which is lowercase only also in CURL. As
 766         * the lowercase versions are the historical quasi-standard, they take
 767         * precedence here, as in CURL.
 768         */
 769        if (!curl_http_proxy) {
 770                if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
 771                        var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 772                        var_override(&curl_http_proxy, getenv("https_proxy"));
 773                } else {
 774                        var_override(&curl_http_proxy, getenv("http_proxy"));
 775                }
 776                if (!curl_http_proxy) {
 777                        var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 778                        var_override(&curl_http_proxy, getenv("all_proxy"));
 779                }
 780        }
 781
 782        if (curl_http_proxy) {
 783                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 784#if LIBCURL_VERSION_NUM >= 0x071800
 785                if (starts_with(curl_http_proxy, "socks5h"))
 786                        curl_easy_setopt(result,
 787                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
 788                else if (starts_with(curl_http_proxy, "socks5"))
 789                        curl_easy_setopt(result,
 790                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 791                else if (starts_with(curl_http_proxy, "socks4a"))
 792                        curl_easy_setopt(result,
 793                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 794                else if (starts_with(curl_http_proxy, "socks"))
 795                        curl_easy_setopt(result,
 796                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 797#endif
 798                if (strstr(curl_http_proxy, "://"))
 799                        credential_from_url(&proxy_auth, curl_http_proxy);
 800                else {
 801                        struct strbuf url = STRBUF_INIT;
 802                        strbuf_addf(&url, "http://%s", curl_http_proxy);
 803                        credential_from_url(&proxy_auth, url.buf);
 804                        strbuf_release(&url);
 805                }
 806
 807                curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 808#if LIBCURL_VERSION_NUM >= 0x071304
 809                var_override(&curl_no_proxy, getenv("NO_PROXY"));
 810                var_override(&curl_no_proxy, getenv("no_proxy"));
 811                curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 812#endif
 813        }
 814        init_curl_proxy_auth(result);
 815
 816        set_curl_keepalive(result);
 817
 818        return result;
 819}
 820
 821static void set_from_env(const char **var, const char *envname)
 822{
 823        const char *val = getenv(envname);
 824        if (val)
 825                *var = val;
 826}
 827
 828void http_init(struct remote *remote, const char *url, int proactive_auth)
 829{
 830        char *low_speed_limit;
 831        char *low_speed_time;
 832        char *normalized_url;
 833        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 834
 835        config.section = "http";
 836        config.key = NULL;
 837        config.collect_fn = http_options;
 838        config.cascade_fn = git_default_config;
 839        config.cb = NULL;
 840
 841        http_is_verbose = 0;
 842        normalized_url = url_normalize(url, &config.url);
 843
 844        git_config(urlmatch_config_entry, &config);
 845        free(normalized_url);
 846
 847        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 848                die("curl_global_init failed");
 849
 850        http_proactive_auth = proactive_auth;
 851
 852        if (remote && remote->http_proxy)
 853                curl_http_proxy = xstrdup(remote->http_proxy);
 854
 855        if (remote)
 856                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 857
 858        pragma_header = curl_slist_append(http_copy_default_headers(),
 859                "Pragma: no-cache");
 860        no_pragma_header = curl_slist_append(http_copy_default_headers(),
 861                "Pragma:");
 862
 863#ifdef USE_CURL_MULTI
 864        {
 865                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 866                if (http_max_requests != NULL)
 867                        max_requests = atoi(http_max_requests);
 868        }
 869
 870        curlm = curl_multi_init();
 871        if (!curlm)
 872                die("curl_multi_init failed");
 873#endif
 874
 875        if (getenv("GIT_SSL_NO_VERIFY"))
 876                curl_ssl_verify = 0;
 877
 878        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 879#if LIBCURL_VERSION_NUM >= 0x070903
 880        set_from_env(&ssl_key, "GIT_SSL_KEY");
 881#endif
 882#if LIBCURL_VERSION_NUM >= 0x070908
 883        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 884#endif
 885        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 886
 887        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 888
 889        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 890        if (low_speed_limit != NULL)
 891                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 892        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 893        if (low_speed_time != NULL)
 894                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 895
 896        if (curl_ssl_verify == -1)
 897                curl_ssl_verify = 1;
 898
 899        curl_session_count = 0;
 900#ifdef USE_CURL_MULTI
 901        if (max_requests < 1)
 902                max_requests = DEFAULT_MAX_REQUESTS;
 903#endif
 904
 905        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 906                curl_ftp_no_epsv = 1;
 907
 908        if (url) {
 909                credential_from_url(&http_auth, url);
 910                if (!ssl_cert_password_required &&
 911                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 912                    starts_with(url, "https://"))
 913                        ssl_cert_password_required = 1;
 914        }
 915
 916#ifndef NO_CURL_EASY_DUPHANDLE
 917        curl_default = get_curl_handle();
 918#endif
 919}
 920
 921void http_cleanup(void)
 922{
 923        struct active_request_slot *slot = active_queue_head;
 924
 925        while (slot != NULL) {
 926                struct active_request_slot *next = slot->next;
 927                if (slot->curl != NULL) {
 928                        xmulti_remove_handle(slot);
 929                        curl_easy_cleanup(slot->curl);
 930                }
 931                free(slot);
 932                slot = next;
 933        }
 934        active_queue_head = NULL;
 935
 936#ifndef NO_CURL_EASY_DUPHANDLE
 937        curl_easy_cleanup(curl_default);
 938#endif
 939
 940#ifdef USE_CURL_MULTI
 941        curl_multi_cleanup(curlm);
 942#endif
 943        curl_global_cleanup();
 944
 945        curl_slist_free_all(extra_http_headers);
 946        extra_http_headers = NULL;
 947
 948        curl_slist_free_all(pragma_header);
 949        pragma_header = NULL;
 950
 951        curl_slist_free_all(no_pragma_header);
 952        no_pragma_header = NULL;
 953
 954        if (curl_http_proxy) {
 955                free((void *)curl_http_proxy);
 956                curl_http_proxy = NULL;
 957        }
 958
 959        if (proxy_auth.password) {
 960                memset(proxy_auth.password, 0, strlen(proxy_auth.password));
 961                free(proxy_auth.password);
 962                proxy_auth.password = NULL;
 963        }
 964
 965        free((void *)curl_proxyuserpwd);
 966        curl_proxyuserpwd = NULL;
 967
 968        free((void *)http_proxy_authmethod);
 969        http_proxy_authmethod = NULL;
 970
 971        if (cert_auth.password != NULL) {
 972                memset(cert_auth.password, 0, strlen(cert_auth.password));
 973                free(cert_auth.password);
 974                cert_auth.password = NULL;
 975        }
 976        ssl_cert_password_required = 0;
 977
 978        free(cached_accept_language);
 979        cached_accept_language = NULL;
 980}
 981
 982struct active_request_slot *get_active_slot(void)
 983{
 984        struct active_request_slot *slot = active_queue_head;
 985        struct active_request_slot *newslot;
 986
 987#ifdef USE_CURL_MULTI
 988        int num_transfers;
 989
 990        /* Wait for a slot to open up if the queue is full */
 991        while (active_requests >= max_requests) {
 992                curl_multi_perform(curlm, &num_transfers);
 993                if (num_transfers < active_requests)
 994                        process_curl_messages();
 995        }
 996#endif
 997
 998        while (slot != NULL && slot->in_use)
 999                slot = slot->next;
1000
1001        if (slot == NULL) {
1002                newslot = xmalloc(sizeof(*newslot));
1003                newslot->curl = NULL;
1004                newslot->in_use = 0;
1005                newslot->next = NULL;
1006
1007                slot = active_queue_head;
1008                if (slot == NULL) {
1009                        active_queue_head = newslot;
1010                } else {
1011                        while (slot->next != NULL)
1012                                slot = slot->next;
1013                        slot->next = newslot;
1014                }
1015                slot = newslot;
1016        }
1017
1018        if (slot->curl == NULL) {
1019#ifdef NO_CURL_EASY_DUPHANDLE
1020                slot->curl = get_curl_handle();
1021#else
1022                slot->curl = curl_easy_duphandle(curl_default);
1023#endif
1024                curl_session_count++;
1025        }
1026
1027        active_requests++;
1028        slot->in_use = 1;
1029        slot->results = NULL;
1030        slot->finished = NULL;
1031        slot->callback_data = NULL;
1032        slot->callback_func = NULL;
1033        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1034        if (curl_save_cookies)
1035                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1036        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1037        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1038        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1039        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1040        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1041        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1042        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1043        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1044        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1045        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1046
1047#if LIBCURL_VERSION_NUM >= 0x070a08
1048        curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1049#endif
1050#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1051        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1052#endif
1053        if (http_auth.password || curl_empty_auth)
1054                init_curl_http_auth(slot->curl);
1055
1056        return slot;
1057}
1058
1059int start_active_slot(struct active_request_slot *slot)
1060{
1061#ifdef USE_CURL_MULTI
1062        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1063        int num_transfers;
1064
1065        if (curlm_result != CURLM_OK &&
1066            curlm_result != CURLM_CALL_MULTI_PERFORM) {
1067                warning("curl_multi_add_handle failed: %s",
1068                        curl_multi_strerror(curlm_result));
1069                active_requests--;
1070                slot->in_use = 0;
1071                return 0;
1072        }
1073
1074        /*
1075         * We know there must be something to do, since we just added
1076         * something.
1077         */
1078        curl_multi_perform(curlm, &num_transfers);
1079#endif
1080        return 1;
1081}
1082
1083#ifdef USE_CURL_MULTI
1084struct fill_chain {
1085        void *data;
1086        int (*fill)(void *);
1087        struct fill_chain *next;
1088};
1089
1090static struct fill_chain *fill_cfg;
1091
1092void add_fill_function(void *data, int (*fill)(void *))
1093{
1094        struct fill_chain *new = xmalloc(sizeof(*new));
1095        struct fill_chain **linkp = &fill_cfg;
1096        new->data = data;
1097        new->fill = fill;
1098        new->next = NULL;
1099        while (*linkp)
1100                linkp = &(*linkp)->next;
1101        *linkp = new;
1102}
1103
1104void fill_active_slots(void)
1105{
1106        struct active_request_slot *slot = active_queue_head;
1107
1108        while (active_requests < max_requests) {
1109                struct fill_chain *fill;
1110                for (fill = fill_cfg; fill; fill = fill->next)
1111                        if (fill->fill(fill->data))
1112                                break;
1113
1114                if (!fill)
1115                        break;
1116        }
1117
1118        while (slot != NULL) {
1119                if (!slot->in_use && slot->curl != NULL
1120                        && curl_session_count > min_curl_sessions) {
1121                        curl_easy_cleanup(slot->curl);
1122                        slot->curl = NULL;
1123                        curl_session_count--;
1124                }
1125                slot = slot->next;
1126        }
1127}
1128
1129void step_active_slots(void)
1130{
1131        int num_transfers;
1132        CURLMcode curlm_result;
1133
1134        do {
1135                curlm_result = curl_multi_perform(curlm, &num_transfers);
1136        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1137        if (num_transfers < active_requests) {
1138                process_curl_messages();
1139                fill_active_slots();
1140        }
1141}
1142#endif
1143
1144void run_active_slot(struct active_request_slot *slot)
1145{
1146#ifdef USE_CURL_MULTI
1147        fd_set readfds;
1148        fd_set writefds;
1149        fd_set excfds;
1150        int max_fd;
1151        struct timeval select_timeout;
1152        int finished = 0;
1153
1154        slot->finished = &finished;
1155        while (!finished) {
1156                step_active_slots();
1157
1158                if (slot->in_use) {
1159#if LIBCURL_VERSION_NUM >= 0x070f04
1160                        long curl_timeout;
1161                        curl_multi_timeout(curlm, &curl_timeout);
1162                        if (curl_timeout == 0) {
1163                                continue;
1164                        } else if (curl_timeout == -1) {
1165                                select_timeout.tv_sec  = 0;
1166                                select_timeout.tv_usec = 50000;
1167                        } else {
1168                                select_timeout.tv_sec  =  curl_timeout / 1000;
1169                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1170                        }
1171#else
1172                        select_timeout.tv_sec  = 0;
1173                        select_timeout.tv_usec = 50000;
1174#endif
1175
1176                        max_fd = -1;
1177                        FD_ZERO(&readfds);
1178                        FD_ZERO(&writefds);
1179                        FD_ZERO(&excfds);
1180                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1181
1182                        /*
1183                         * It can happen that curl_multi_timeout returns a pathologically
1184                         * long timeout when curl_multi_fdset returns no file descriptors
1185                         * to read.  See commit message for more details.
1186                         */
1187                        if (max_fd < 0 &&
1188                            (select_timeout.tv_sec > 0 ||
1189                             select_timeout.tv_usec > 50000)) {
1190                                select_timeout.tv_sec  = 0;
1191                                select_timeout.tv_usec = 50000;
1192                        }
1193
1194                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1195                }
1196        }
1197#else
1198        while (slot->in_use) {
1199                slot->curl_result = curl_easy_perform(slot->curl);
1200                finish_active_slot(slot);
1201        }
1202#endif
1203}
1204
1205static void release_active_slot(struct active_request_slot *slot)
1206{
1207        closedown_active_slot(slot);
1208        if (slot->curl) {
1209                xmulti_remove_handle(slot);
1210                if (curl_session_count > min_curl_sessions) {
1211                        curl_easy_cleanup(slot->curl);
1212                        slot->curl = NULL;
1213                        curl_session_count--;
1214                }
1215        }
1216#ifdef USE_CURL_MULTI
1217        fill_active_slots();
1218#endif
1219}
1220
1221void finish_all_active_slots(void)
1222{
1223        struct active_request_slot *slot = active_queue_head;
1224
1225        while (slot != NULL)
1226                if (slot->in_use) {
1227                        run_active_slot(slot);
1228                        slot = active_queue_head;
1229                } else {
1230                        slot = slot->next;
1231                }
1232}
1233
1234/* Helpers for modifying and creating URLs */
1235static inline int needs_quote(int ch)
1236{
1237        if (((ch >= 'A') && (ch <= 'Z'))
1238                        || ((ch >= 'a') && (ch <= 'z'))
1239                        || ((ch >= '0') && (ch <= '9'))
1240                        || (ch == '/')
1241                        || (ch == '-')
1242                        || (ch == '.'))
1243                return 0;
1244        return 1;
1245}
1246
1247static char *quote_ref_url(const char *base, const char *ref)
1248{
1249        struct strbuf buf = STRBUF_INIT;
1250        const char *cp;
1251        int ch;
1252
1253        end_url_with_slash(&buf, base);
1254
1255        for (cp = ref; (ch = *cp) != 0; cp++)
1256                if (needs_quote(ch))
1257                        strbuf_addf(&buf, "%%%02x", ch);
1258                else
1259                        strbuf_addch(&buf, *cp);
1260
1261        return strbuf_detach(&buf, NULL);
1262}
1263
1264void append_remote_object_url(struct strbuf *buf, const char *url,
1265                              const char *hex,
1266                              int only_two_digit_prefix)
1267{
1268        end_url_with_slash(buf, url);
1269
1270        strbuf_addf(buf, "objects/%.*s/", 2, hex);
1271        if (!only_two_digit_prefix)
1272                strbuf_addstr(buf, hex + 2);
1273}
1274
1275char *get_remote_object_url(const char *url, const char *hex,
1276                            int only_two_digit_prefix)
1277{
1278        struct strbuf buf = STRBUF_INIT;
1279        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1280        return strbuf_detach(&buf, NULL);
1281}
1282
1283static int handle_curl_result(struct slot_results *results)
1284{
1285        /*
1286         * If we see a failing http code with CURLE_OK, we have turned off
1287         * FAILONERROR (to keep the server's custom error response), and should
1288         * translate the code into failure here.
1289         */
1290        if (results->curl_result == CURLE_OK &&
1291            results->http_code >= 400) {
1292                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1293                /*
1294                 * Normally curl will already have put the "reason phrase"
1295                 * from the server into curl_errorstr; unfortunately without
1296                 * FAILONERROR it is lost, so we can give only the numeric
1297                 * status code.
1298                 */
1299                snprintf(curl_errorstr, sizeof(curl_errorstr),
1300                         "The requested URL returned error: %ld",
1301                         results->http_code);
1302        }
1303
1304        if (results->curl_result == CURLE_OK) {
1305                credential_approve(&http_auth);
1306                if (proxy_auth.password)
1307                        credential_approve(&proxy_auth);
1308                return HTTP_OK;
1309        } else if (missing_target(results))
1310                return HTTP_MISSING_TARGET;
1311        else if (results->http_code == 401) {
1312                if (http_auth.username && http_auth.password) {
1313                        credential_reject(&http_auth);
1314                        return HTTP_NOAUTH;
1315                } else {
1316#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1317                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1318#endif
1319                        return HTTP_REAUTH;
1320                }
1321        } else {
1322                if (results->http_connectcode == 407)
1323                        credential_reject(&proxy_auth);
1324#if LIBCURL_VERSION_NUM >= 0x070c00
1325                if (!curl_errorstr[0])
1326                        strlcpy(curl_errorstr,
1327                                curl_easy_strerror(results->curl_result),
1328                                sizeof(curl_errorstr));
1329#endif
1330                return HTTP_ERROR;
1331        }
1332}
1333
1334int run_one_slot(struct active_request_slot *slot,
1335                 struct slot_results *results)
1336{
1337        slot->results = results;
1338        if (!start_active_slot(slot)) {
1339                snprintf(curl_errorstr, sizeof(curl_errorstr),
1340                         "failed to start HTTP request");
1341                return HTTP_START_FAILED;
1342        }
1343
1344        run_active_slot(slot);
1345        return handle_curl_result(results);
1346}
1347
1348struct curl_slist *http_copy_default_headers(void)
1349{
1350        struct curl_slist *headers = NULL, *h;
1351
1352        for (h = extra_http_headers; h; h = h->next)
1353                headers = curl_slist_append(headers, h->data);
1354
1355        return headers;
1356}
1357
1358static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1359{
1360        char *ptr;
1361        CURLcode ret;
1362
1363        strbuf_reset(buf);
1364        ret = curl_easy_getinfo(curl, info, &ptr);
1365        if (!ret && ptr)
1366                strbuf_addstr(buf, ptr);
1367        return ret;
1368}
1369
1370/*
1371 * Check for and extract a content-type parameter. "raw"
1372 * should be positioned at the start of the potential
1373 * parameter, with any whitespace already removed.
1374 *
1375 * "name" is the name of the parameter. The value is appended
1376 * to "out".
1377 */
1378static int extract_param(const char *raw, const char *name,
1379                         struct strbuf *out)
1380{
1381        size_t len = strlen(name);
1382
1383        if (strncasecmp(raw, name, len))
1384                return -1;
1385        raw += len;
1386
1387        if (*raw != '=')
1388                return -1;
1389        raw++;
1390
1391        while (*raw && !isspace(*raw) && *raw != ';')
1392                strbuf_addch(out, *raw++);
1393        return 0;
1394}
1395
1396/*
1397 * Extract a normalized version of the content type, with any
1398 * spaces suppressed, all letters lowercased, and no trailing ";"
1399 * or parameters.
1400 *
1401 * Note that we will silently remove even invalid whitespace. For
1402 * example, "text / plain" is specifically forbidden by RFC 2616,
1403 * but "text/plain" is the only reasonable output, and this keeps
1404 * our code simple.
1405 *
1406 * If the "charset" argument is not NULL, store the value of any
1407 * charset parameter there.
1408 *
1409 * Example:
1410 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1411 *   "text / plain" -> "text/plain"
1412 */
1413static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1414                                 struct strbuf *charset)
1415{
1416        const char *p;
1417
1418        strbuf_reset(type);
1419        strbuf_grow(type, raw->len);
1420        for (p = raw->buf; *p; p++) {
1421                if (isspace(*p))
1422                        continue;
1423                if (*p == ';') {
1424                        p++;
1425                        break;
1426                }
1427                strbuf_addch(type, tolower(*p));
1428        }
1429
1430        if (!charset)
1431                return;
1432
1433        strbuf_reset(charset);
1434        while (*p) {
1435                while (isspace(*p) || *p == ';')
1436                        p++;
1437                if (!extract_param(p, "charset", charset))
1438                        return;
1439                while (*p && !isspace(*p))
1440                        p++;
1441        }
1442
1443        if (!charset->len && starts_with(type->buf, "text/"))
1444                strbuf_addstr(charset, "ISO-8859-1");
1445}
1446
1447static void write_accept_language(struct strbuf *buf)
1448{
1449        /*
1450         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1451         * that, q-value will be smaller than 0.001, the minimum q-value the
1452         * HTTP specification allows. See
1453         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1454         */
1455        const int MAX_DECIMAL_PLACES = 3;
1456        const int MAX_LANGUAGE_TAGS = 1000;
1457        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1458        char **language_tags = NULL;
1459        int num_langs = 0;
1460        const char *s = get_preferred_languages();
1461        int i;
1462        struct strbuf tag = STRBUF_INIT;
1463
1464        /* Don't add Accept-Language header if no language is preferred. */
1465        if (!s)
1466                return;
1467
1468        /*
1469         * Split the colon-separated string of preferred languages into
1470         * language_tags array.
1471         */
1472        do {
1473                /* collect language tag */
1474                for (; *s && (isalnum(*s) || *s == '_'); s++)
1475                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1476
1477                /* skip .codeset, @modifier and any other unnecessary parts */
1478                while (*s && *s != ':')
1479                        s++;
1480
1481                if (tag.len) {
1482                        num_langs++;
1483                        REALLOC_ARRAY(language_tags, num_langs);
1484                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1485                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1486                                break;
1487                }
1488        } while (*s++);
1489
1490        /* write Accept-Language header into buf */
1491        if (num_langs) {
1492                int last_buf_len = 0;
1493                int max_q;
1494                int decimal_places;
1495                char q_format[32];
1496
1497                /* add '*' */
1498                REALLOC_ARRAY(language_tags, num_langs + 1);
1499                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1500
1501                /* compute decimal_places */
1502                for (max_q = 1, decimal_places = 0;
1503                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1504                     decimal_places++, max_q *= 10)
1505                        ;
1506
1507                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1508
1509                strbuf_addstr(buf, "Accept-Language: ");
1510
1511                for (i = 0; i < num_langs; i++) {
1512                        if (i > 0)
1513                                strbuf_addstr(buf, ", ");
1514
1515                        strbuf_addstr(buf, language_tags[i]);
1516
1517                        if (i > 0)
1518                                strbuf_addf(buf, q_format, max_q - i);
1519
1520                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1521                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1522                                break;
1523                        }
1524
1525                        last_buf_len = buf->len;
1526                }
1527        }
1528
1529        /* free language tags -- last one is a static '*' */
1530        for (i = 0; i < num_langs - 1; i++)
1531                free(language_tags[i]);
1532        free(language_tags);
1533}
1534
1535/*
1536 * Get an Accept-Language header which indicates user's preferred languages.
1537 *
1538 * Examples:
1539 *   LANGUAGE= -> ""
1540 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1541 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1542 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1543 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1544 *   LANGUAGE= LANG=C -> ""
1545 */
1546static const char *get_accept_language(void)
1547{
1548        if (!cached_accept_language) {
1549                struct strbuf buf = STRBUF_INIT;
1550                write_accept_language(&buf);
1551                if (buf.len > 0)
1552                        cached_accept_language = strbuf_detach(&buf, NULL);
1553        }
1554
1555        return cached_accept_language;
1556}
1557
1558static void http_opt_request_remainder(CURL *curl, off_t pos)
1559{
1560        char buf[128];
1561        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1562        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1563}
1564
1565/* http_request() targets */
1566#define HTTP_REQUEST_STRBUF     0
1567#define HTTP_REQUEST_FILE       1
1568
1569static int http_request(const char *url,
1570                        void *result, int target,
1571                        const struct http_get_options *options)
1572{
1573        struct active_request_slot *slot;
1574        struct slot_results results;
1575        struct curl_slist *headers = http_copy_default_headers();
1576        struct strbuf buf = STRBUF_INIT;
1577        const char *accept_language;
1578        int ret;
1579
1580        slot = get_active_slot();
1581        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1582
1583        if (result == NULL) {
1584                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1585        } else {
1586                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1587                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1588
1589                if (target == HTTP_REQUEST_FILE) {
1590                        off_t posn = ftello(result);
1591                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1592                                         fwrite);
1593                        if (posn > 0)
1594                                http_opt_request_remainder(slot->curl, posn);
1595                } else
1596                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1597                                         fwrite_buffer);
1598        }
1599
1600        accept_language = get_accept_language();
1601
1602        if (accept_language)
1603                headers = curl_slist_append(headers, accept_language);
1604
1605        strbuf_addstr(&buf, "Pragma:");
1606        if (options && options->no_cache)
1607                strbuf_addstr(&buf, " no-cache");
1608        if (options && options->keep_error)
1609                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1610
1611        headers = curl_slist_append(headers, buf.buf);
1612
1613        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1614        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1615        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1616
1617        ret = run_one_slot(slot, &results);
1618
1619        if (options && options->content_type) {
1620                struct strbuf raw = STRBUF_INIT;
1621                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1622                extract_content_type(&raw, options->content_type,
1623                                     options->charset);
1624                strbuf_release(&raw);
1625        }
1626
1627        if (options && options->effective_url)
1628                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1629                                options->effective_url);
1630
1631        curl_slist_free_all(headers);
1632        strbuf_release(&buf);
1633
1634        return ret;
1635}
1636
1637/*
1638 * Update the "base" url to a more appropriate value, as deduced by
1639 * redirects seen when requesting a URL starting with "url".
1640 *
1641 * The "asked" parameter is a URL that we asked curl to access, and must begin
1642 * with "base".
1643 *
1644 * The "got" parameter is the URL that curl reported to us as where we ended
1645 * up.
1646 *
1647 * Returns 1 if we updated the base url, 0 otherwise.
1648 *
1649 * Our basic strategy is to compare "base" and "asked" to find the bits
1650 * specific to our request. We then strip those bits off of "got" to yield the
1651 * new base. So for example, if our base is "http://example.com/foo.git",
1652 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1653 * with "https://other.example.com/foo.git/info/refs". We would want the
1654 * new URL to become "https://other.example.com/foo.git".
1655 *
1656 * Note that this assumes a sane redirect scheme. It's entirely possible
1657 * in the example above to end up at a URL that does not even end in
1658 * "info/refs".  In such a case we simply punt, as there is not much we can
1659 * do (and such a scheme is unlikely to represent a real git repository,
1660 * which means we are likely about to abort anyway).
1661 */
1662static int update_url_from_redirect(struct strbuf *base,
1663                                    const char *asked,
1664                                    const struct strbuf *got)
1665{
1666        const char *tail;
1667        size_t tail_len;
1668
1669        if (!strcmp(asked, got->buf))
1670                return 0;
1671
1672        if (!skip_prefix(asked, base->buf, &tail))
1673                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1674                    asked, base->buf);
1675
1676        tail_len = strlen(tail);
1677
1678        if (got->len < tail_len ||
1679            strcmp(tail, got->buf + got->len - tail_len))
1680                return 0; /* insane redirect scheme */
1681
1682        strbuf_reset(base);
1683        strbuf_add(base, got->buf, got->len - tail_len);
1684        return 1;
1685}
1686
1687static int http_request_reauth(const char *url,
1688                               void *result, int target,
1689                               struct http_get_options *options)
1690{
1691        int ret = http_request(url, result, target, options);
1692
1693        if (options && options->effective_url && options->base_url) {
1694                if (update_url_from_redirect(options->base_url,
1695                                             url, options->effective_url)) {
1696                        credential_from_url(&http_auth, options->base_url->buf);
1697                        url = options->effective_url->buf;
1698                }
1699        }
1700
1701        if (ret != HTTP_REAUTH)
1702                return ret;
1703
1704        /*
1705         * If we are using KEEP_ERROR, the previous request may have
1706         * put cruft into our output stream; we should clear it out before
1707         * making our next request. We only know how to do this for
1708         * the strbuf case, but that is enough to satisfy current callers.
1709         */
1710        if (options && options->keep_error) {
1711                switch (target) {
1712                case HTTP_REQUEST_STRBUF:
1713                        strbuf_reset(result);
1714                        break;
1715                default:
1716                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1717                }
1718        }
1719
1720        credential_fill(&http_auth);
1721
1722        return http_request(url, result, target, options);
1723}
1724
1725int http_get_strbuf(const char *url,
1726                    struct strbuf *result,
1727                    struct http_get_options *options)
1728{
1729        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1730}
1731
1732/*
1733 * Downloads a URL and stores the result in the given file.
1734 *
1735 * If a previous interrupted download is detected (i.e. a previous temporary
1736 * file is still around) the download is resumed.
1737 */
1738static int http_get_file(const char *url, const char *filename,
1739                         struct http_get_options *options)
1740{
1741        int ret;
1742        struct strbuf tmpfile = STRBUF_INIT;
1743        FILE *result;
1744
1745        strbuf_addf(&tmpfile, "%s.temp", filename);
1746        result = fopen(tmpfile.buf, "a");
1747        if (!result) {
1748                error("Unable to open local file %s", tmpfile.buf);
1749                ret = HTTP_ERROR;
1750                goto cleanup;
1751        }
1752
1753        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1754        fclose(result);
1755
1756        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1757                ret = HTTP_ERROR;
1758cleanup:
1759        strbuf_release(&tmpfile);
1760        return ret;
1761}
1762
1763int http_fetch_ref(const char *base, struct ref *ref)
1764{
1765        struct http_get_options options = {0};
1766        char *url;
1767        struct strbuf buffer = STRBUF_INIT;
1768        int ret = -1;
1769
1770        options.no_cache = 1;
1771
1772        url = quote_ref_url(base, ref->name);
1773        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1774                strbuf_rtrim(&buffer);
1775                if (buffer.len == 40)
1776                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
1777                else if (starts_with(buffer.buf, "ref: ")) {
1778                        ref->symref = xstrdup(buffer.buf + 5);
1779                        ret = 0;
1780                }
1781        }
1782
1783        strbuf_release(&buffer);
1784        free(url);
1785        return ret;
1786}
1787
1788/* Helpers for fetching packs */
1789static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1790{
1791        char *url, *tmp;
1792        struct strbuf buf = STRBUF_INIT;
1793
1794        if (http_is_verbose)
1795                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1796
1797        end_url_with_slash(&buf, base_url);
1798        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1799        url = strbuf_detach(&buf, NULL);
1800
1801        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1802        tmp = strbuf_detach(&buf, NULL);
1803
1804        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1805                error("Unable to get pack index %s", url);
1806                free(tmp);
1807                tmp = NULL;
1808        }
1809
1810        free(url);
1811        return tmp;
1812}
1813
1814static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1815        unsigned char *sha1, const char *base_url)
1816{
1817        struct packed_git *new_pack;
1818        char *tmp_idx = NULL;
1819        int ret;
1820
1821        if (has_pack_index(sha1)) {
1822                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1823                if (!new_pack)
1824                        return -1; /* parse_pack_index() already issued error message */
1825                goto add_pack;
1826        }
1827
1828        tmp_idx = fetch_pack_index(sha1, base_url);
1829        if (!tmp_idx)
1830                return -1;
1831
1832        new_pack = parse_pack_index(sha1, tmp_idx);
1833        if (!new_pack) {
1834                unlink(tmp_idx);
1835                free(tmp_idx);
1836
1837                return -1; /* parse_pack_index() already issued error message */
1838        }
1839
1840        ret = verify_pack_index(new_pack);
1841        if (!ret) {
1842                close_pack_index(new_pack);
1843                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1844        }
1845        free(tmp_idx);
1846        if (ret)
1847                return -1;
1848
1849add_pack:
1850        new_pack->next = *packs_head;
1851        *packs_head = new_pack;
1852        return 0;
1853}
1854
1855int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1856{
1857        struct http_get_options options = {0};
1858        int ret = 0, i = 0;
1859        char *url, *data;
1860        struct strbuf buf = STRBUF_INIT;
1861        unsigned char sha1[20];
1862
1863        end_url_with_slash(&buf, base_url);
1864        strbuf_addstr(&buf, "objects/info/packs");
1865        url = strbuf_detach(&buf, NULL);
1866
1867        options.no_cache = 1;
1868        ret = http_get_strbuf(url, &buf, &options);
1869        if (ret != HTTP_OK)
1870                goto cleanup;
1871
1872        data = buf.buf;
1873        while (i < buf.len) {
1874                switch (data[i]) {
1875                case 'P':
1876                        i++;
1877                        if (i + 52 <= buf.len &&
1878                            starts_with(data + i, " pack-") &&
1879                            starts_with(data + i + 46, ".pack\n")) {
1880                                get_sha1_hex(data + i + 6, sha1);
1881                                fetch_and_setup_pack_index(packs_head, sha1,
1882                                                      base_url);
1883                                i += 51;
1884                                break;
1885                        }
1886                default:
1887                        while (i < buf.len && data[i] != '\n')
1888                                i++;
1889                }
1890                i++;
1891        }
1892
1893cleanup:
1894        free(url);
1895        return ret;
1896}
1897
1898void release_http_pack_request(struct http_pack_request *preq)
1899{
1900        if (preq->packfile != NULL) {
1901                fclose(preq->packfile);
1902                preq->packfile = NULL;
1903        }
1904        preq->slot = NULL;
1905        free(preq->url);
1906        free(preq);
1907}
1908
1909int finish_http_pack_request(struct http_pack_request *preq)
1910{
1911        struct packed_git **lst;
1912        struct packed_git *p = preq->target;
1913        char *tmp_idx;
1914        size_t len;
1915        struct child_process ip = CHILD_PROCESS_INIT;
1916        const char *ip_argv[8];
1917
1918        close_pack_index(p);
1919
1920        fclose(preq->packfile);
1921        preq->packfile = NULL;
1922
1923        lst = preq->lst;
1924        while (*lst != p)
1925                lst = &((*lst)->next);
1926        *lst = (*lst)->next;
1927
1928        if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1929                die("BUG: pack tmpfile does not end in .pack.temp?");
1930        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1931
1932        ip_argv[0] = "index-pack";
1933        ip_argv[1] = "-o";
1934        ip_argv[2] = tmp_idx;
1935        ip_argv[3] = preq->tmpfile;
1936        ip_argv[4] = NULL;
1937
1938        ip.argv = ip_argv;
1939        ip.git_cmd = 1;
1940        ip.no_stdin = 1;
1941        ip.no_stdout = 1;
1942
1943        if (run_command(&ip)) {
1944                unlink(preq->tmpfile);
1945                unlink(tmp_idx);
1946                free(tmp_idx);
1947                return -1;
1948        }
1949
1950        unlink(sha1_pack_index_name(p->sha1));
1951
1952        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1953         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1954                free(tmp_idx);
1955                return -1;
1956        }
1957
1958        install_packed_git(p);
1959        free(tmp_idx);
1960        return 0;
1961}
1962
1963struct http_pack_request *new_http_pack_request(
1964        struct packed_git *target, const char *base_url)
1965{
1966        off_t prev_posn = 0;
1967        struct strbuf buf = STRBUF_INIT;
1968        struct http_pack_request *preq;
1969
1970        preq = xcalloc(1, sizeof(*preq));
1971        preq->target = target;
1972
1973        end_url_with_slash(&buf, base_url);
1974        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1975                sha1_to_hex(target->sha1));
1976        preq->url = strbuf_detach(&buf, NULL);
1977
1978        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1979                sha1_pack_name(target->sha1));
1980        preq->packfile = fopen(preq->tmpfile, "a");
1981        if (!preq->packfile) {
1982                error("Unable to open local file %s for pack",
1983                      preq->tmpfile);
1984                goto abort;
1985        }
1986
1987        preq->slot = get_active_slot();
1988        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1989        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1990        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1991        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1992                no_pragma_header);
1993
1994        /*
1995         * If there is data present from a previous transfer attempt,
1996         * resume where it left off
1997         */
1998        prev_posn = ftello(preq->packfile);
1999        if (prev_posn>0) {
2000                if (http_is_verbose)
2001                        fprintf(stderr,
2002                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2003                                sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2004                http_opt_request_remainder(preq->slot->curl, prev_posn);
2005        }
2006
2007        return preq;
2008
2009abort:
2010        free(preq->url);
2011        free(preq);
2012        return NULL;
2013}
2014
2015/* Helpers for fetching objects (loose) */
2016static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2017                               void *data)
2018{
2019        unsigned char expn[4096];
2020        size_t size = eltsize * nmemb;
2021        int posn = 0;
2022        struct http_object_request *freq = data;
2023        struct active_request_slot *slot = freq->slot;
2024
2025        if (slot) {
2026                CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2027                                                &slot->http_code);
2028                if (c != CURLE_OK)
2029                        die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2030                                curl_easy_strerror(c));
2031                if (slot->http_code >= 400)
2032                        return size;
2033        }
2034
2035        do {
2036                ssize_t retval = xwrite(freq->localfile,
2037                                        (char *) ptr + posn, size - posn);
2038                if (retval < 0)
2039                        return posn;
2040                posn += retval;
2041        } while (posn < size);
2042
2043        freq->stream.avail_in = size;
2044        freq->stream.next_in = (void *)ptr;
2045        do {
2046                freq->stream.next_out = expn;
2047                freq->stream.avail_out = sizeof(expn);
2048                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2049                git_SHA1_Update(&freq->c, expn,
2050                                sizeof(expn) - freq->stream.avail_out);
2051        } while (freq->stream.avail_in && freq->zret == Z_OK);
2052        return size;
2053}
2054
2055struct http_object_request *new_http_object_request(const char *base_url,
2056        unsigned char *sha1)
2057{
2058        char *hex = sha1_to_hex(sha1);
2059        const char *filename;
2060        char prevfile[PATH_MAX];
2061        int prevlocal;
2062        char prev_buf[PREV_BUF_SIZE];
2063        ssize_t prev_read = 0;
2064        off_t prev_posn = 0;
2065        struct http_object_request *freq;
2066
2067        freq = xcalloc(1, sizeof(*freq));
2068        hashcpy(freq->sha1, sha1);
2069        freq->localfile = -1;
2070
2071        filename = sha1_file_name(sha1);
2072        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2073                 "%s.temp", filename);
2074
2075        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2076        unlink_or_warn(prevfile);
2077        rename(freq->tmpfile, prevfile);
2078        unlink_or_warn(freq->tmpfile);
2079
2080        if (freq->localfile != -1)
2081                error("fd leakage in start: %d", freq->localfile);
2082        freq->localfile = open(freq->tmpfile,
2083                               O_WRONLY | O_CREAT | O_EXCL, 0666);
2084        /*
2085         * This could have failed due to the "lazy directory creation";
2086         * try to mkdir the last path component.
2087         */
2088        if (freq->localfile < 0 && errno == ENOENT) {
2089                char *dir = strrchr(freq->tmpfile, '/');
2090                if (dir) {
2091                        *dir = 0;
2092                        mkdir(freq->tmpfile, 0777);
2093                        *dir = '/';
2094                }
2095                freq->localfile = open(freq->tmpfile,
2096                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
2097        }
2098
2099        if (freq->localfile < 0) {
2100                error_errno("Couldn't create temporary file %s", freq->tmpfile);
2101                goto abort;
2102        }
2103
2104        git_inflate_init(&freq->stream);
2105
2106        git_SHA1_Init(&freq->c);
2107
2108        freq->url = get_remote_object_url(base_url, hex, 0);
2109
2110        /*
2111         * If a previous temp file is present, process what was already
2112         * fetched.
2113         */
2114        prevlocal = open(prevfile, O_RDONLY);
2115        if (prevlocal != -1) {
2116                do {
2117                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2118                        if (prev_read>0) {
2119                                if (fwrite_sha1_file(prev_buf,
2120                                                     1,
2121                                                     prev_read,
2122                                                     freq) == prev_read) {
2123                                        prev_posn += prev_read;
2124                                } else {
2125                                        prev_read = -1;
2126                                }
2127                        }
2128                } while (prev_read > 0);
2129                close(prevlocal);
2130        }
2131        unlink_or_warn(prevfile);
2132
2133        /*
2134         * Reset inflate/SHA1 if there was an error reading the previous temp
2135         * file; also rewind to the beginning of the local file.
2136         */
2137        if (prev_read == -1) {
2138                memset(&freq->stream, 0, sizeof(freq->stream));
2139                git_inflate_init(&freq->stream);
2140                git_SHA1_Init(&freq->c);
2141                if (prev_posn>0) {
2142                        prev_posn = 0;
2143                        lseek(freq->localfile, 0, SEEK_SET);
2144                        if (ftruncate(freq->localfile, 0) < 0) {
2145                                error_errno("Couldn't truncate temporary file %s",
2146                                            freq->tmpfile);
2147                                goto abort;
2148                        }
2149                }
2150        }
2151
2152        freq->slot = get_active_slot();
2153
2154        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2155        curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2156        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2157        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2158        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2159        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2160
2161        /*
2162         * If we have successfully processed data from a previous fetch
2163         * attempt, only fetch the data we don't already have.
2164         */
2165        if (prev_posn>0) {
2166                if (http_is_verbose)
2167                        fprintf(stderr,
2168                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2169                                hex, (uintmax_t)prev_posn);
2170                http_opt_request_remainder(freq->slot->curl, prev_posn);
2171        }
2172
2173        return freq;
2174
2175abort:
2176        free(freq->url);
2177        free(freq);
2178        return NULL;
2179}
2180
2181void process_http_object_request(struct http_object_request *freq)
2182{
2183        if (freq->slot == NULL)
2184                return;
2185        freq->curl_result = freq->slot->curl_result;
2186        freq->http_code = freq->slot->http_code;
2187        freq->slot = NULL;
2188}
2189
2190int finish_http_object_request(struct http_object_request *freq)
2191{
2192        struct stat st;
2193
2194        close(freq->localfile);
2195        freq->localfile = -1;
2196
2197        process_http_object_request(freq);
2198
2199        if (freq->http_code == 416) {
2200                warning("requested range invalid; we may already have all the data.");
2201        } else if (freq->curl_result != CURLE_OK) {
2202                if (stat(freq->tmpfile, &st) == 0)
2203                        if (st.st_size == 0)
2204                                unlink_or_warn(freq->tmpfile);
2205                return -1;
2206        }
2207
2208        git_inflate_end(&freq->stream);
2209        git_SHA1_Final(freq->real_sha1, &freq->c);
2210        if (freq->zret != Z_STREAM_END) {
2211                unlink_or_warn(freq->tmpfile);
2212                return -1;
2213        }
2214        if (hashcmp(freq->sha1, freq->real_sha1)) {
2215                unlink_or_warn(freq->tmpfile);
2216                return -1;
2217        }
2218        freq->rename =
2219                finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2220
2221        return freq->rename;
2222}
2223
2224void abort_http_object_request(struct http_object_request *freq)
2225{
2226        unlink_or_warn(freq->tmpfile);
2227
2228        release_http_object_request(freq);
2229}
2230
2231void release_http_object_request(struct http_object_request *freq)
2232{
2233        if (freq->localfile != -1) {
2234                close(freq->localfile);
2235                freq->localfile = -1;
2236        }
2237        if (freq->url != NULL) {
2238                free(freq->url);
2239                freq->url = NULL;
2240        }
2241        if (freq->slot != NULL) {
2242                freq->slot->callback_func = NULL;
2243                freq->slot->callback_data = NULL;
2244                release_active_slot(freq->slot);
2245                freq->slot = NULL;
2246        }
2247}