http.con commit Merge branch 'rs/cocci-strbuf-addf-to-addstr' (ab66fc2)
   1#include "git-compat-util.h"
   2#include "http.h"
   3#include "config.h"
   4#include "pack.h"
   5#include "sideband.h"
   6#include "run-command.h"
   7#include "url.h"
   8#include "urlmatch.h"
   9#include "credential.h"
  10#include "version.h"
  11#include "pkt-line.h"
  12#include "gettext.h"
  13#include "transport.h"
  14#include "packfile.h"
  15#include "protocol.h"
  16#include "string-list.h"
  17
  18static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
  19static int trace_curl_data = 1;
  20static struct string_list cookies_to_redact = STRING_LIST_INIT_DUP;
  21#if LIBCURL_VERSION_NUM >= 0x070a08
  22long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  23#else
  24long int git_curl_ipresolve;
  25#endif
  26int active_requests;
  27int http_is_verbose;
  28ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  29
  30#if LIBCURL_VERSION_NUM >= 0x070a06
  31#define LIBCURL_CAN_HANDLE_AUTH_ANY
  32#endif
  33
  34static int min_curl_sessions = 1;
  35static int curl_session_count;
  36#ifdef USE_CURL_MULTI
  37static int max_requests = -1;
  38static CURLM *curlm;
  39#endif
  40#ifndef NO_CURL_EASY_DUPHANDLE
  41static CURL *curl_default;
  42#endif
  43
  44#define PREV_BUF_SIZE 4096
  45
  46char curl_errorstr[CURL_ERROR_SIZE];
  47
  48static int curl_ssl_verify = -1;
  49static int curl_ssl_try;
  50static const char *ssl_cert;
  51static const char *ssl_cipherlist;
  52static const char *ssl_version;
  53static struct {
  54        const char *name;
  55        long ssl_version;
  56} sslversions[] = {
  57        { "sslv2", CURL_SSLVERSION_SSLv2 },
  58        { "sslv3", CURL_SSLVERSION_SSLv3 },
  59        { "tlsv1", CURL_SSLVERSION_TLSv1 },
  60#if LIBCURL_VERSION_NUM >= 0x072200
  61        { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  62        { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  63        { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  64#endif
  65};
  66#if LIBCURL_VERSION_NUM >= 0x070903
  67static const char *ssl_key;
  68#endif
  69#if LIBCURL_VERSION_NUM >= 0x070908
  70static const char *ssl_capath;
  71#endif
  72#if LIBCURL_VERSION_NUM >= 0x072c00
  73static const char *ssl_pinnedkey;
  74#endif
  75static const char *ssl_cainfo;
  76static long curl_low_speed_limit = -1;
  77static long curl_low_speed_time = -1;
  78static int curl_ftp_no_epsv;
  79static const char *curl_http_proxy;
  80static const char *curl_no_proxy;
  81static const char *http_proxy_authmethod;
  82static struct {
  83        const char *name;
  84        long curlauth_param;
  85} proxy_authmethods[] = {
  86        { "basic", CURLAUTH_BASIC },
  87        { "digest", CURLAUTH_DIGEST },
  88        { "negotiate", CURLAUTH_GSSNEGOTIATE },
  89        { "ntlm", CURLAUTH_NTLM },
  90#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  91        { "anyauth", CURLAUTH_ANY },
  92#endif
  93        /*
  94         * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  95         * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  96         * here, too
  97         */
  98};
  99#ifdef CURLGSSAPI_DELEGATION_FLAG
 100static const char *curl_deleg;
 101static struct {
 102        const char *name;
 103        long curl_deleg_param;
 104} curl_deleg_levels[] = {
 105        { "none", CURLGSSAPI_DELEGATION_NONE },
 106        { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
 107        { "always", CURLGSSAPI_DELEGATION_FLAG },
 108};
 109#endif
 110
 111static struct credential proxy_auth = CREDENTIAL_INIT;
 112static const char *curl_proxyuserpwd;
 113static const char *curl_cookie_file;
 114static int curl_save_cookies;
 115struct credential http_auth = CREDENTIAL_INIT;
 116static int http_proactive_auth;
 117static const char *user_agent;
 118static int curl_empty_auth = -1;
 119
 120enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
 121
 122#if LIBCURL_VERSION_NUM >= 0x071700
 123/* Use CURLOPT_KEYPASSWD as is */
 124#elif LIBCURL_VERSION_NUM >= 0x070903
 125#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 126#else
 127#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 128#endif
 129
 130static struct credential cert_auth = CREDENTIAL_INIT;
 131static int ssl_cert_password_required;
 132#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 133static unsigned long http_auth_methods = CURLAUTH_ANY;
 134static int http_auth_methods_restricted;
 135/* Modes for which empty_auth cannot actually help us. */
 136static unsigned long empty_auth_useless =
 137        CURLAUTH_BASIC
 138#ifdef CURLAUTH_DIGEST_IE
 139        | CURLAUTH_DIGEST_IE
 140#endif
 141        | CURLAUTH_DIGEST;
 142#endif
 143
 144static struct curl_slist *pragma_header;
 145static struct curl_slist *no_pragma_header;
 146static struct curl_slist *extra_http_headers;
 147
 148static struct active_request_slot *active_queue_head;
 149
 150static char *cached_accept_language;
 151
 152size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 153{
 154        size_t size = eltsize * nmemb;
 155        struct buffer *buffer = buffer_;
 156
 157        if (size > buffer->buf.len - buffer->posn)
 158                size = buffer->buf.len - buffer->posn;
 159        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 160        buffer->posn += size;
 161
 162        return size;
 163}
 164
 165#ifndef NO_CURL_IOCTL
 166curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 167{
 168        struct buffer *buffer = clientp;
 169
 170        switch (cmd) {
 171        case CURLIOCMD_NOP:
 172                return CURLIOE_OK;
 173
 174        case CURLIOCMD_RESTARTREAD:
 175                buffer->posn = 0;
 176                return CURLIOE_OK;
 177
 178        default:
 179                return CURLIOE_UNKNOWNCMD;
 180        }
 181}
 182#endif
 183
 184size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 185{
 186        size_t size = eltsize * nmemb;
 187        struct strbuf *buffer = buffer_;
 188
 189        strbuf_add(buffer, ptr, size);
 190        return size;
 191}
 192
 193size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 194{
 195        return eltsize * nmemb;
 196}
 197
 198static void closedown_active_slot(struct active_request_slot *slot)
 199{
 200        active_requests--;
 201        slot->in_use = 0;
 202}
 203
 204static void finish_active_slot(struct active_request_slot *slot)
 205{
 206        closedown_active_slot(slot);
 207        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 208
 209        if (slot->finished != NULL)
 210                (*slot->finished) = 1;
 211
 212        /* Store slot results so they can be read after the slot is reused */
 213        if (slot->results != NULL) {
 214                slot->results->curl_result = slot->curl_result;
 215                slot->results->http_code = slot->http_code;
 216#if LIBCURL_VERSION_NUM >= 0x070a08
 217                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 218                                  &slot->results->auth_avail);
 219#else
 220                slot->results->auth_avail = 0;
 221#endif
 222
 223                curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 224                        &slot->results->http_connectcode);
 225        }
 226
 227        /* Run callback if appropriate */
 228        if (slot->callback_func != NULL)
 229                slot->callback_func(slot->callback_data);
 230}
 231
 232static void xmulti_remove_handle(struct active_request_slot *slot)
 233{
 234#ifdef USE_CURL_MULTI
 235        curl_multi_remove_handle(curlm, slot->curl);
 236#endif
 237}
 238
 239#ifdef USE_CURL_MULTI
 240static void process_curl_messages(void)
 241{
 242        int num_messages;
 243        struct active_request_slot *slot;
 244        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 245
 246        while (curl_message != NULL) {
 247                if (curl_message->msg == CURLMSG_DONE) {
 248                        int curl_result = curl_message->data.result;
 249                        slot = active_queue_head;
 250                        while (slot != NULL &&
 251                               slot->curl != curl_message->easy_handle)
 252                                slot = slot->next;
 253                        if (slot != NULL) {
 254                                xmulti_remove_handle(slot);
 255                                slot->curl_result = curl_result;
 256                                finish_active_slot(slot);
 257                        } else {
 258                                fprintf(stderr, "Received DONE message for unknown request!\n");
 259                        }
 260                } else {
 261                        fprintf(stderr, "Unknown CURL message received: %d\n",
 262                                (int)curl_message->msg);
 263                }
 264                curl_message = curl_multi_info_read(curlm, &num_messages);
 265        }
 266}
 267#endif
 268
 269static int http_options(const char *var, const char *value, void *cb)
 270{
 271        if (!strcmp("http.sslverify", var)) {
 272                curl_ssl_verify = git_config_bool(var, value);
 273                return 0;
 274        }
 275        if (!strcmp("http.sslcipherlist", var))
 276                return git_config_string(&ssl_cipherlist, var, value);
 277        if (!strcmp("http.sslversion", var))
 278                return git_config_string(&ssl_version, var, value);
 279        if (!strcmp("http.sslcert", var))
 280                return git_config_pathname(&ssl_cert, var, value);
 281#if LIBCURL_VERSION_NUM >= 0x070903
 282        if (!strcmp("http.sslkey", var))
 283                return git_config_pathname(&ssl_key, var, value);
 284#endif
 285#if LIBCURL_VERSION_NUM >= 0x070908
 286        if (!strcmp("http.sslcapath", var))
 287                return git_config_pathname(&ssl_capath, var, value);
 288#endif
 289        if (!strcmp("http.sslcainfo", var))
 290                return git_config_pathname(&ssl_cainfo, var, value);
 291        if (!strcmp("http.sslcertpasswordprotected", var)) {
 292                ssl_cert_password_required = git_config_bool(var, value);
 293                return 0;
 294        }
 295        if (!strcmp("http.ssltry", var)) {
 296                curl_ssl_try = git_config_bool(var, value);
 297                return 0;
 298        }
 299        if (!strcmp("http.minsessions", var)) {
 300                min_curl_sessions = git_config_int(var, value);
 301#ifndef USE_CURL_MULTI
 302                if (min_curl_sessions > 1)
 303                        min_curl_sessions = 1;
 304#endif
 305                return 0;
 306        }
 307#ifdef USE_CURL_MULTI
 308        if (!strcmp("http.maxrequests", var)) {
 309                max_requests = git_config_int(var, value);
 310                return 0;
 311        }
 312#endif
 313        if (!strcmp("http.lowspeedlimit", var)) {
 314                curl_low_speed_limit = (long)git_config_int(var, value);
 315                return 0;
 316        }
 317        if (!strcmp("http.lowspeedtime", var)) {
 318                curl_low_speed_time = (long)git_config_int(var, value);
 319                return 0;
 320        }
 321
 322        if (!strcmp("http.noepsv", var)) {
 323                curl_ftp_no_epsv = git_config_bool(var, value);
 324                return 0;
 325        }
 326        if (!strcmp("http.proxy", var))
 327                return git_config_string(&curl_http_proxy, var, value);
 328
 329        if (!strcmp("http.proxyauthmethod", var))
 330                return git_config_string(&http_proxy_authmethod, var, value);
 331
 332        if (!strcmp("http.cookiefile", var))
 333                return git_config_pathname(&curl_cookie_file, var, value);
 334        if (!strcmp("http.savecookies", var)) {
 335                curl_save_cookies = git_config_bool(var, value);
 336                return 0;
 337        }
 338
 339        if (!strcmp("http.postbuffer", var)) {
 340                http_post_buffer = git_config_ssize_t(var, value);
 341                if (http_post_buffer < 0)
 342                        warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
 343                if (http_post_buffer < LARGE_PACKET_MAX)
 344                        http_post_buffer = LARGE_PACKET_MAX;
 345                return 0;
 346        }
 347
 348        if (!strcmp("http.useragent", var))
 349                return git_config_string(&user_agent, var, value);
 350
 351        if (!strcmp("http.emptyauth", var)) {
 352                if (value && !strcmp("auto", value))
 353                        curl_empty_auth = -1;
 354                else
 355                        curl_empty_auth = git_config_bool(var, value);
 356                return 0;
 357        }
 358
 359        if (!strcmp("http.delegation", var)) {
 360#ifdef CURLGSSAPI_DELEGATION_FLAG
 361                return git_config_string(&curl_deleg, var, value);
 362#else
 363                warning(_("Delegation control is not supported with cURL < 7.22.0"));
 364                return 0;
 365#endif
 366        }
 367
 368        if (!strcmp("http.pinnedpubkey", var)) {
 369#if LIBCURL_VERSION_NUM >= 0x072c00
 370                return git_config_pathname(&ssl_pinnedkey, var, value);
 371#else
 372                warning(_("Public key pinning not supported with cURL < 7.44.0"));
 373                return 0;
 374#endif
 375        }
 376
 377        if (!strcmp("http.extraheader", var)) {
 378                if (!value) {
 379                        return config_error_nonbool(var);
 380                } else if (!*value) {
 381                        curl_slist_free_all(extra_http_headers);
 382                        extra_http_headers = NULL;
 383                } else {
 384                        extra_http_headers =
 385                                curl_slist_append(extra_http_headers, value);
 386                }
 387                return 0;
 388        }
 389
 390        if (!strcmp("http.followredirects", var)) {
 391                if (value && !strcmp(value, "initial"))
 392                        http_follow_config = HTTP_FOLLOW_INITIAL;
 393                else if (git_config_bool(var, value))
 394                        http_follow_config = HTTP_FOLLOW_ALWAYS;
 395                else
 396                        http_follow_config = HTTP_FOLLOW_NONE;
 397                return 0;
 398        }
 399
 400        /* Fall back on the default ones */
 401        return git_default_config(var, value, cb);
 402}
 403
 404static int curl_empty_auth_enabled(void)
 405{
 406        if (curl_empty_auth >= 0)
 407                return curl_empty_auth;
 408
 409#ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
 410        /*
 411         * Our libcurl is too old to do AUTH_ANY in the first place;
 412         * just default to turning the feature off.
 413         */
 414#else
 415        /*
 416         * In the automatic case, kick in the empty-auth
 417         * hack as long as we would potentially try some
 418         * method more exotic than "Basic" or "Digest".
 419         *
 420         * But only do this when this is our second or
 421         * subsequent request, as by then we know what
 422         * methods are available.
 423         */
 424        if (http_auth_methods_restricted &&
 425            (http_auth_methods & ~empty_auth_useless))
 426                return 1;
 427#endif
 428        return 0;
 429}
 430
 431static void init_curl_http_auth(CURL *result)
 432{
 433        if (!http_auth.username || !*http_auth.username) {
 434                if (curl_empty_auth_enabled())
 435                        curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 436                return;
 437        }
 438
 439        credential_fill(&http_auth);
 440
 441#if LIBCURL_VERSION_NUM >= 0x071301
 442        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 443        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 444#else
 445        {
 446                static struct strbuf up = STRBUF_INIT;
 447                /*
 448                 * Note that we assume we only ever have a single set of
 449                 * credentials in a given program run, so we do not have
 450                 * to worry about updating this buffer, only setting its
 451                 * initial value.
 452                 */
 453                if (!up.len)
 454                        strbuf_addf(&up, "%s:%s",
 455                                http_auth.username, http_auth.password);
 456                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 457        }
 458#endif
 459}
 460
 461/* *var must be free-able */
 462static void var_override(const char **var, char *value)
 463{
 464        if (value) {
 465                free((void *)*var);
 466                *var = xstrdup(value);
 467        }
 468}
 469
 470static void set_proxyauth_name_password(CURL *result)
 471{
 472#if LIBCURL_VERSION_NUM >= 0x071301
 473                curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 474                        proxy_auth.username);
 475                curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 476                        proxy_auth.password);
 477#else
 478                struct strbuf s = STRBUF_INIT;
 479
 480                strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 481                strbuf_addch(&s, ':');
 482                strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 483                curl_proxyuserpwd = strbuf_detach(&s, NULL);
 484                curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 485#endif
 486}
 487
 488static void init_curl_proxy_auth(CURL *result)
 489{
 490        if (proxy_auth.username) {
 491                if (!proxy_auth.password)
 492                        credential_fill(&proxy_auth);
 493                set_proxyauth_name_password(result);
 494        }
 495
 496        var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 497
 498#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 499        if (http_proxy_authmethod) {
 500                int i;
 501                for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 502                        if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 503                                curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 504                                                proxy_authmethods[i].curlauth_param);
 505                                break;
 506                        }
 507                }
 508                if (i == ARRAY_SIZE(proxy_authmethods)) {
 509                        warning("unsupported proxy authentication method %s: using anyauth",
 510                                        http_proxy_authmethod);
 511                        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 512                }
 513        }
 514        else
 515                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 516#endif
 517}
 518
 519static int has_cert_password(void)
 520{
 521        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 522                return 0;
 523        if (!cert_auth.password) {
 524                cert_auth.protocol = xstrdup("cert");
 525                cert_auth.username = xstrdup("");
 526                cert_auth.path = xstrdup(ssl_cert);
 527                credential_fill(&cert_auth);
 528        }
 529        return 1;
 530}
 531
 532#if LIBCURL_VERSION_NUM >= 0x071900
 533static void set_curl_keepalive(CURL *c)
 534{
 535        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 536}
 537
 538#elif LIBCURL_VERSION_NUM >= 0x071000
 539static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 540{
 541        int ka = 1;
 542        int rc;
 543        socklen_t len = (socklen_t)sizeof(ka);
 544
 545        if (type != CURLSOCKTYPE_IPCXN)
 546                return 0;
 547
 548        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 549        if (rc < 0)
 550                warning_errno("unable to set SO_KEEPALIVE on socket");
 551
 552        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 553}
 554
 555static void set_curl_keepalive(CURL *c)
 556{
 557        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 558}
 559
 560#else
 561static void set_curl_keepalive(CURL *c)
 562{
 563        /* not supported on older curl versions */
 564}
 565#endif
 566
 567static void redact_sensitive_header(struct strbuf *header)
 568{
 569        const char *sensitive_header;
 570
 571        if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 572            skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 573                /* The first token is the type, which is OK to log */
 574                while (isspace(*sensitive_header))
 575                        sensitive_header++;
 576                while (*sensitive_header && !isspace(*sensitive_header))
 577                        sensitive_header++;
 578                /* Everything else is opaque and possibly sensitive */
 579                strbuf_setlen(header,  sensitive_header - header->buf);
 580                strbuf_addstr(header, " <redacted>");
 581        } else if (cookies_to_redact.nr &&
 582                   skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
 583                struct strbuf redacted_header = STRBUF_INIT;
 584                char *cookie;
 585
 586                while (isspace(*sensitive_header))
 587                        sensitive_header++;
 588
 589                /*
 590                 * The contents of header starting from sensitive_header will
 591                 * subsequently be overridden, so it is fine to mutate this
 592                 * string (hence the assignment to "char *").
 593                 */
 594                cookie = (char *) sensitive_header;
 595
 596                while (cookie) {
 597                        char *equals;
 598                        char *semicolon = strstr(cookie, "; ");
 599                        if (semicolon)
 600                                *semicolon = 0;
 601                        equals = strchrnul(cookie, '=');
 602                        if (!equals) {
 603                                /* invalid cookie, just append and continue */
 604                                strbuf_addstr(&redacted_header, cookie);
 605                                continue;
 606                        }
 607                        *equals = 0; /* temporarily set to NUL for lookup */
 608                        if (string_list_lookup(&cookies_to_redact, cookie)) {
 609                                strbuf_addstr(&redacted_header, cookie);
 610                                strbuf_addstr(&redacted_header, "=<redacted>");
 611                        } else {
 612                                *equals = '=';
 613                                strbuf_addstr(&redacted_header, cookie);
 614                        }
 615                        if (semicolon) {
 616                                /*
 617                                 * There are more cookies. (Or, for some
 618                                 * reason, the input string ends in "; ".)
 619                                 */
 620                                strbuf_addstr(&redacted_header, "; ");
 621                                cookie = semicolon + strlen("; ");
 622                        } else {
 623                                cookie = NULL;
 624                        }
 625                }
 626
 627                strbuf_setlen(header, sensitive_header - header->buf);
 628                strbuf_addbuf(header, &redacted_header);
 629        }
 630}
 631
 632static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 633{
 634        struct strbuf out = STRBUF_INIT;
 635        struct strbuf **headers, **header;
 636
 637        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 638                text, (long)size, (long)size);
 639        trace_strbuf(&trace_curl, &out);
 640        strbuf_reset(&out);
 641        strbuf_add(&out, ptr, size);
 642        headers = strbuf_split_max(&out, '\n', 0);
 643
 644        for (header = headers; *header; header++) {
 645                if (hide_sensitive_header)
 646                        redact_sensitive_header(*header);
 647                strbuf_insert((*header), 0, text, strlen(text));
 648                strbuf_insert((*header), strlen(text), ": ", 2);
 649                strbuf_rtrim((*header));
 650                strbuf_addch((*header), '\n');
 651                trace_strbuf(&trace_curl, (*header));
 652        }
 653        strbuf_list_free(headers);
 654        strbuf_release(&out);
 655}
 656
 657static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 658{
 659        size_t i;
 660        struct strbuf out = STRBUF_INIT;
 661        unsigned int width = 60;
 662
 663        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 664                text, (long)size, (long)size);
 665        trace_strbuf(&trace_curl, &out);
 666
 667        for (i = 0; i < size; i += width) {
 668                size_t w;
 669
 670                strbuf_reset(&out);
 671                strbuf_addf(&out, "%s: ", text);
 672                for (w = 0; (w < width) && (i + w < size); w++) {
 673                        unsigned char ch = ptr[i + w];
 674
 675                        strbuf_addch(&out,
 676                                       (ch >= 0x20) && (ch < 0x80)
 677                                       ? ch : '.');
 678                }
 679                strbuf_addch(&out, '\n');
 680                trace_strbuf(&trace_curl, &out);
 681        }
 682        strbuf_release(&out);
 683}
 684
 685static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 686{
 687        const char *text;
 688        enum { NO_FILTER = 0, DO_FILTER = 1 };
 689
 690        switch (type) {
 691        case CURLINFO_TEXT:
 692                trace_printf_key(&trace_curl, "== Info: %s", data);
 693                break;
 694        case CURLINFO_HEADER_OUT:
 695                text = "=> Send header";
 696                curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 697                break;
 698        case CURLINFO_DATA_OUT:
 699                if (trace_curl_data) {
 700                        text = "=> Send data";
 701                        curl_dump_data(text, (unsigned char *)data, size);
 702                }
 703                break;
 704        case CURLINFO_SSL_DATA_OUT:
 705                if (trace_curl_data) {
 706                        text = "=> Send SSL data";
 707                        curl_dump_data(text, (unsigned char *)data, size);
 708                }
 709                break;
 710        case CURLINFO_HEADER_IN:
 711                text = "<= Recv header";
 712                curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 713                break;
 714        case CURLINFO_DATA_IN:
 715                if (trace_curl_data) {
 716                        text = "<= Recv data";
 717                        curl_dump_data(text, (unsigned char *)data, size);
 718                }
 719                break;
 720        case CURLINFO_SSL_DATA_IN:
 721                if (trace_curl_data) {
 722                        text = "<= Recv SSL data";
 723                        curl_dump_data(text, (unsigned char *)data, size);
 724                }
 725                break;
 726
 727        default:                /* we ignore unknown types by default */
 728                return 0;
 729        }
 730        return 0;
 731}
 732
 733void setup_curl_trace(CURL *handle)
 734{
 735        if (!trace_want(&trace_curl))
 736                return;
 737        curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 738        curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 739        curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 740}
 741
 742#ifdef CURLPROTO_HTTP
 743static long get_curl_allowed_protocols(int from_user)
 744{
 745        long allowed_protocols = 0;
 746
 747        if (is_transport_allowed("http", from_user))
 748                allowed_protocols |= CURLPROTO_HTTP;
 749        if (is_transport_allowed("https", from_user))
 750                allowed_protocols |= CURLPROTO_HTTPS;
 751        if (is_transport_allowed("ftp", from_user))
 752                allowed_protocols |= CURLPROTO_FTP;
 753        if (is_transport_allowed("ftps", from_user))
 754                allowed_protocols |= CURLPROTO_FTPS;
 755
 756        return allowed_protocols;
 757}
 758#endif
 759
 760static CURL *get_curl_handle(void)
 761{
 762        CURL *result = curl_easy_init();
 763
 764        if (!result)
 765                die("curl_easy_init failed");
 766
 767        if (!curl_ssl_verify) {
 768                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 769                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 770        } else {
 771                /* Verify authenticity of the peer's certificate */
 772                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 773                /* The name in the cert must match whom we tried to connect */
 774                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 775        }
 776
 777#if LIBCURL_VERSION_NUM >= 0x070907
 778        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 779#endif
 780#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 781        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 782#endif
 783
 784#ifdef CURLGSSAPI_DELEGATION_FLAG
 785        if (curl_deleg) {
 786                int i;
 787                for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
 788                        if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
 789                                curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
 790                                                curl_deleg_levels[i].curl_deleg_param);
 791                                break;
 792                        }
 793                }
 794                if (i == ARRAY_SIZE(curl_deleg_levels))
 795                        warning("Unknown delegation method '%s': using default",
 796                                curl_deleg);
 797        }
 798#endif
 799
 800        if (http_proactive_auth)
 801                init_curl_http_auth(result);
 802
 803        if (getenv("GIT_SSL_VERSION"))
 804                ssl_version = getenv("GIT_SSL_VERSION");
 805        if (ssl_version && *ssl_version) {
 806                int i;
 807                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 808                        if (!strcmp(ssl_version, sslversions[i].name)) {
 809                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 810                                                 sslversions[i].ssl_version);
 811                                break;
 812                        }
 813                }
 814                if (i == ARRAY_SIZE(sslversions))
 815                        warning("unsupported ssl version %s: using default",
 816                                ssl_version);
 817        }
 818
 819        if (getenv("GIT_SSL_CIPHER_LIST"))
 820                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 821        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 822                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 823                                ssl_cipherlist);
 824
 825        if (ssl_cert != NULL)
 826                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 827        if (has_cert_password())
 828                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 829#if LIBCURL_VERSION_NUM >= 0x070903
 830        if (ssl_key != NULL)
 831                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 832#endif
 833#if LIBCURL_VERSION_NUM >= 0x070908
 834        if (ssl_capath != NULL)
 835                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 836#endif
 837#if LIBCURL_VERSION_NUM >= 0x072c00
 838        if (ssl_pinnedkey != NULL)
 839                curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 840#endif
 841        if (ssl_cainfo != NULL)
 842                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 843
 844        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 845                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 846                                 curl_low_speed_limit);
 847                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 848                                 curl_low_speed_time);
 849        }
 850
 851        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 852#if LIBCURL_VERSION_NUM >= 0x071301
 853        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 854#elif LIBCURL_VERSION_NUM >= 0x071101
 855        curl_easy_setopt(result, CURLOPT_POST301, 1);
 856#endif
 857#ifdef CURLPROTO_HTTP
 858        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
 859                         get_curl_allowed_protocols(0));
 860        curl_easy_setopt(result, CURLOPT_PROTOCOLS,
 861                         get_curl_allowed_protocols(-1));
 862#else
 863        warning("protocol restrictions not applied to curl redirects because\n"
 864                "your curl version is too old (>= 7.19.4)");
 865#endif
 866        if (getenv("GIT_CURL_VERBOSE"))
 867                curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
 868        setup_curl_trace(result);
 869        if (getenv("GIT_TRACE_CURL_NO_DATA"))
 870                trace_curl_data = 0;
 871        if (getenv("GIT_REDACT_COOKIES")) {
 872                string_list_split(&cookies_to_redact,
 873                                  getenv("GIT_REDACT_COOKIES"), ',', -1);
 874                string_list_sort(&cookies_to_redact);
 875        }
 876
 877        curl_easy_setopt(result, CURLOPT_USERAGENT,
 878                user_agent ? user_agent : git_user_agent());
 879
 880        if (curl_ftp_no_epsv)
 881                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 882
 883#ifdef CURLOPT_USE_SSL
 884        if (curl_ssl_try)
 885                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 886#endif
 887
 888        /*
 889         * CURL also examines these variables as a fallback; but we need to query
 890         * them here in order to decide whether to prompt for missing password (cf.
 891         * init_curl_proxy_auth()).
 892         *
 893         * Unlike many other common environment variables, these are historically
 894         * lowercase only. It appears that CURL did not know this and implemented
 895         * only uppercase variants, which was later corrected to take both - with
 896         * the exception of http_proxy, which is lowercase only also in CURL. As
 897         * the lowercase versions are the historical quasi-standard, they take
 898         * precedence here, as in CURL.
 899         */
 900        if (!curl_http_proxy) {
 901                if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
 902                        var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 903                        var_override(&curl_http_proxy, getenv("https_proxy"));
 904                } else {
 905                        var_override(&curl_http_proxy, getenv("http_proxy"));
 906                }
 907                if (!curl_http_proxy) {
 908                        var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 909                        var_override(&curl_http_proxy, getenv("all_proxy"));
 910                }
 911        }
 912
 913        if (curl_http_proxy && curl_http_proxy[0] == '\0') {
 914                /*
 915                 * Handle case with the empty http.proxy value here to keep
 916                 * common code clean.
 917                 * NB: empty option disables proxying at all.
 918                 */
 919                curl_easy_setopt(result, CURLOPT_PROXY, "");
 920        } else if (curl_http_proxy) {
 921#if LIBCURL_VERSION_NUM >= 0x071800
 922                if (starts_with(curl_http_proxy, "socks5h"))
 923                        curl_easy_setopt(result,
 924                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
 925                else if (starts_with(curl_http_proxy, "socks5"))
 926                        curl_easy_setopt(result,
 927                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 928                else if (starts_with(curl_http_proxy, "socks4a"))
 929                        curl_easy_setopt(result,
 930                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 931                else if (starts_with(curl_http_proxy, "socks"))
 932                        curl_easy_setopt(result,
 933                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 934#endif
 935#if LIBCURL_VERSION_NUM >= 0x073400
 936                else if (starts_with(curl_http_proxy, "https"))
 937                        curl_easy_setopt(result,
 938                                CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
 939#endif
 940                if (strstr(curl_http_proxy, "://"))
 941                        credential_from_url(&proxy_auth, curl_http_proxy);
 942                else {
 943                        struct strbuf url = STRBUF_INIT;
 944                        strbuf_addf(&url, "http://%s", curl_http_proxy);
 945                        credential_from_url(&proxy_auth, url.buf);
 946                        strbuf_release(&url);
 947                }
 948
 949                if (!proxy_auth.host)
 950                        die("Invalid proxy URL '%s'", curl_http_proxy);
 951
 952                curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 953#if LIBCURL_VERSION_NUM >= 0x071304
 954                var_override(&curl_no_proxy, getenv("NO_PROXY"));
 955                var_override(&curl_no_proxy, getenv("no_proxy"));
 956                curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 957#endif
 958        }
 959        init_curl_proxy_auth(result);
 960
 961        set_curl_keepalive(result);
 962
 963        return result;
 964}
 965
 966static void set_from_env(const char **var, const char *envname)
 967{
 968        const char *val = getenv(envname);
 969        if (val)
 970                *var = val;
 971}
 972
 973static void protocol_http_header(void)
 974{
 975        if (get_protocol_version_config() > 0) {
 976                struct strbuf protocol_header = STRBUF_INIT;
 977
 978                strbuf_addf(&protocol_header, GIT_PROTOCOL_HEADER ": version=%d",
 979                            get_protocol_version_config());
 980
 981
 982                extra_http_headers = curl_slist_append(extra_http_headers,
 983                                                       protocol_header.buf);
 984                strbuf_release(&protocol_header);
 985        }
 986}
 987
 988void http_init(struct remote *remote, const char *url, int proactive_auth)
 989{
 990        char *low_speed_limit;
 991        char *low_speed_time;
 992        char *normalized_url;
 993        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 994
 995        config.section = "http";
 996        config.key = NULL;
 997        config.collect_fn = http_options;
 998        config.cascade_fn = git_default_config;
 999        config.cb = NULL;
1000
1001        http_is_verbose = 0;
1002        normalized_url = url_normalize(url, &config.url);
1003
1004        git_config(urlmatch_config_entry, &config);
1005        free(normalized_url);
1006
1007        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1008                die("curl_global_init failed");
1009
1010        http_proactive_auth = proactive_auth;
1011
1012        if (remote && remote->http_proxy)
1013                curl_http_proxy = xstrdup(remote->http_proxy);
1014
1015        if (remote)
1016                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1017
1018        protocol_http_header();
1019
1020        pragma_header = curl_slist_append(http_copy_default_headers(),
1021                "Pragma: no-cache");
1022        no_pragma_header = curl_slist_append(http_copy_default_headers(),
1023                "Pragma:");
1024
1025#ifdef USE_CURL_MULTI
1026        {
1027                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1028                if (http_max_requests != NULL)
1029                        max_requests = atoi(http_max_requests);
1030        }
1031
1032        curlm = curl_multi_init();
1033        if (!curlm)
1034                die("curl_multi_init failed");
1035#endif
1036
1037        if (getenv("GIT_SSL_NO_VERIFY"))
1038                curl_ssl_verify = 0;
1039
1040        set_from_env(&ssl_cert, "GIT_SSL_CERT");
1041#if LIBCURL_VERSION_NUM >= 0x070903
1042        set_from_env(&ssl_key, "GIT_SSL_KEY");
1043#endif
1044#if LIBCURL_VERSION_NUM >= 0x070908
1045        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1046#endif
1047        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1048
1049        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1050
1051        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1052        if (low_speed_limit != NULL)
1053                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1054        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1055        if (low_speed_time != NULL)
1056                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1057
1058        if (curl_ssl_verify == -1)
1059                curl_ssl_verify = 1;
1060
1061        curl_session_count = 0;
1062#ifdef USE_CURL_MULTI
1063        if (max_requests < 1)
1064                max_requests = DEFAULT_MAX_REQUESTS;
1065#endif
1066
1067        if (getenv("GIT_CURL_FTP_NO_EPSV"))
1068                curl_ftp_no_epsv = 1;
1069
1070        if (url) {
1071                credential_from_url(&http_auth, url);
1072                if (!ssl_cert_password_required &&
1073                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1074                    starts_with(url, "https://"))
1075                        ssl_cert_password_required = 1;
1076        }
1077
1078#ifndef NO_CURL_EASY_DUPHANDLE
1079        curl_default = get_curl_handle();
1080#endif
1081}
1082
1083void http_cleanup(void)
1084{
1085        struct active_request_slot *slot = active_queue_head;
1086
1087        while (slot != NULL) {
1088                struct active_request_slot *next = slot->next;
1089                if (slot->curl != NULL) {
1090                        xmulti_remove_handle(slot);
1091                        curl_easy_cleanup(slot->curl);
1092                }
1093                free(slot);
1094                slot = next;
1095        }
1096        active_queue_head = NULL;
1097
1098#ifndef NO_CURL_EASY_DUPHANDLE
1099        curl_easy_cleanup(curl_default);
1100#endif
1101
1102#ifdef USE_CURL_MULTI
1103        curl_multi_cleanup(curlm);
1104#endif
1105        curl_global_cleanup();
1106
1107        curl_slist_free_all(extra_http_headers);
1108        extra_http_headers = NULL;
1109
1110        curl_slist_free_all(pragma_header);
1111        pragma_header = NULL;
1112
1113        curl_slist_free_all(no_pragma_header);
1114        no_pragma_header = NULL;
1115
1116        if (curl_http_proxy) {
1117                free((void *)curl_http_proxy);
1118                curl_http_proxy = NULL;
1119        }
1120
1121        if (proxy_auth.password) {
1122                memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1123                FREE_AND_NULL(proxy_auth.password);
1124        }
1125
1126        free((void *)curl_proxyuserpwd);
1127        curl_proxyuserpwd = NULL;
1128
1129        free((void *)http_proxy_authmethod);
1130        http_proxy_authmethod = NULL;
1131
1132        if (cert_auth.password != NULL) {
1133                memset(cert_auth.password, 0, strlen(cert_auth.password));
1134                FREE_AND_NULL(cert_auth.password);
1135        }
1136        ssl_cert_password_required = 0;
1137
1138        FREE_AND_NULL(cached_accept_language);
1139}
1140
1141struct active_request_slot *get_active_slot(void)
1142{
1143        struct active_request_slot *slot = active_queue_head;
1144        struct active_request_slot *newslot;
1145
1146#ifdef USE_CURL_MULTI
1147        int num_transfers;
1148
1149        /* Wait for a slot to open up if the queue is full */
1150        while (active_requests >= max_requests) {
1151                curl_multi_perform(curlm, &num_transfers);
1152                if (num_transfers < active_requests)
1153                        process_curl_messages();
1154        }
1155#endif
1156
1157        while (slot != NULL && slot->in_use)
1158                slot = slot->next;
1159
1160        if (slot == NULL) {
1161                newslot = xmalloc(sizeof(*newslot));
1162                newslot->curl = NULL;
1163                newslot->in_use = 0;
1164                newslot->next = NULL;
1165
1166                slot = active_queue_head;
1167                if (slot == NULL) {
1168                        active_queue_head = newslot;
1169                } else {
1170                        while (slot->next != NULL)
1171                                slot = slot->next;
1172                        slot->next = newslot;
1173                }
1174                slot = newslot;
1175        }
1176
1177        if (slot->curl == NULL) {
1178#ifdef NO_CURL_EASY_DUPHANDLE
1179                slot->curl = get_curl_handle();
1180#else
1181                slot->curl = curl_easy_duphandle(curl_default);
1182#endif
1183                curl_session_count++;
1184        }
1185
1186        active_requests++;
1187        slot->in_use = 1;
1188        slot->results = NULL;
1189        slot->finished = NULL;
1190        slot->callback_data = NULL;
1191        slot->callback_func = NULL;
1192        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1193        if (curl_save_cookies)
1194                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1195        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1196        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1197        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1198        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1199        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1200        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1201        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1202        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1203        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1204        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1205
1206        /*
1207         * Default following to off unless "ALWAYS" is configured; this gives
1208         * callers a sane starting point, and they can tweak for individual
1209         * HTTP_FOLLOW_* cases themselves.
1210         */
1211        if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1212                curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1213        else
1214                curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1215
1216#if LIBCURL_VERSION_NUM >= 0x070a08
1217        curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1218#endif
1219#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1220        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1221#endif
1222        if (http_auth.password || curl_empty_auth_enabled())
1223                init_curl_http_auth(slot->curl);
1224
1225        return slot;
1226}
1227
1228int start_active_slot(struct active_request_slot *slot)
1229{
1230#ifdef USE_CURL_MULTI
1231        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1232        int num_transfers;
1233
1234        if (curlm_result != CURLM_OK &&
1235            curlm_result != CURLM_CALL_MULTI_PERFORM) {
1236                warning("curl_multi_add_handle failed: %s",
1237                        curl_multi_strerror(curlm_result));
1238                active_requests--;
1239                slot->in_use = 0;
1240                return 0;
1241        }
1242
1243        /*
1244         * We know there must be something to do, since we just added
1245         * something.
1246         */
1247        curl_multi_perform(curlm, &num_transfers);
1248#endif
1249        return 1;
1250}
1251
1252#ifdef USE_CURL_MULTI
1253struct fill_chain {
1254        void *data;
1255        int (*fill)(void *);
1256        struct fill_chain *next;
1257};
1258
1259static struct fill_chain *fill_cfg;
1260
1261void add_fill_function(void *data, int (*fill)(void *))
1262{
1263        struct fill_chain *new = xmalloc(sizeof(*new));
1264        struct fill_chain **linkp = &fill_cfg;
1265        new->data = data;
1266        new->fill = fill;
1267        new->next = NULL;
1268        while (*linkp)
1269                linkp = &(*linkp)->next;
1270        *linkp = new;
1271}
1272
1273void fill_active_slots(void)
1274{
1275        struct active_request_slot *slot = active_queue_head;
1276
1277        while (active_requests < max_requests) {
1278                struct fill_chain *fill;
1279                for (fill = fill_cfg; fill; fill = fill->next)
1280                        if (fill->fill(fill->data))
1281                                break;
1282
1283                if (!fill)
1284                        break;
1285        }
1286
1287        while (slot != NULL) {
1288                if (!slot->in_use && slot->curl != NULL
1289                        && curl_session_count > min_curl_sessions) {
1290                        curl_easy_cleanup(slot->curl);
1291                        slot->curl = NULL;
1292                        curl_session_count--;
1293                }
1294                slot = slot->next;
1295        }
1296}
1297
1298void step_active_slots(void)
1299{
1300        int num_transfers;
1301        CURLMcode curlm_result;
1302
1303        do {
1304                curlm_result = curl_multi_perform(curlm, &num_transfers);
1305        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1306        if (num_transfers < active_requests) {
1307                process_curl_messages();
1308                fill_active_slots();
1309        }
1310}
1311#endif
1312
1313void run_active_slot(struct active_request_slot *slot)
1314{
1315#ifdef USE_CURL_MULTI
1316        fd_set readfds;
1317        fd_set writefds;
1318        fd_set excfds;
1319        int max_fd;
1320        struct timeval select_timeout;
1321        int finished = 0;
1322
1323        slot->finished = &finished;
1324        while (!finished) {
1325                step_active_slots();
1326
1327                if (slot->in_use) {
1328#if LIBCURL_VERSION_NUM >= 0x070f04
1329                        long curl_timeout;
1330                        curl_multi_timeout(curlm, &curl_timeout);
1331                        if (curl_timeout == 0) {
1332                                continue;
1333                        } else if (curl_timeout == -1) {
1334                                select_timeout.tv_sec  = 0;
1335                                select_timeout.tv_usec = 50000;
1336                        } else {
1337                                select_timeout.tv_sec  =  curl_timeout / 1000;
1338                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1339                        }
1340#else
1341                        select_timeout.tv_sec  = 0;
1342                        select_timeout.tv_usec = 50000;
1343#endif
1344
1345                        max_fd = -1;
1346                        FD_ZERO(&readfds);
1347                        FD_ZERO(&writefds);
1348                        FD_ZERO(&excfds);
1349                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1350
1351                        /*
1352                         * It can happen that curl_multi_timeout returns a pathologically
1353                         * long timeout when curl_multi_fdset returns no file descriptors
1354                         * to read.  See commit message for more details.
1355                         */
1356                        if (max_fd < 0 &&
1357                            (select_timeout.tv_sec > 0 ||
1358                             select_timeout.tv_usec > 50000)) {
1359                                select_timeout.tv_sec  = 0;
1360                                select_timeout.tv_usec = 50000;
1361                        }
1362
1363                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1364                }
1365        }
1366#else
1367        while (slot->in_use) {
1368                slot->curl_result = curl_easy_perform(slot->curl);
1369                finish_active_slot(slot);
1370        }
1371#endif
1372}
1373
1374static void release_active_slot(struct active_request_slot *slot)
1375{
1376        closedown_active_slot(slot);
1377        if (slot->curl) {
1378                xmulti_remove_handle(slot);
1379                if (curl_session_count > min_curl_sessions) {
1380                        curl_easy_cleanup(slot->curl);
1381                        slot->curl = NULL;
1382                        curl_session_count--;
1383                }
1384        }
1385#ifdef USE_CURL_MULTI
1386        fill_active_slots();
1387#endif
1388}
1389
1390void finish_all_active_slots(void)
1391{
1392        struct active_request_slot *slot = active_queue_head;
1393
1394        while (slot != NULL)
1395                if (slot->in_use) {
1396                        run_active_slot(slot);
1397                        slot = active_queue_head;
1398                } else {
1399                        slot = slot->next;
1400                }
1401}
1402
1403/* Helpers for modifying and creating URLs */
1404static inline int needs_quote(int ch)
1405{
1406        if (((ch >= 'A') && (ch <= 'Z'))
1407                        || ((ch >= 'a') && (ch <= 'z'))
1408                        || ((ch >= '0') && (ch <= '9'))
1409                        || (ch == '/')
1410                        || (ch == '-')
1411                        || (ch == '.'))
1412                return 0;
1413        return 1;
1414}
1415
1416static char *quote_ref_url(const char *base, const char *ref)
1417{
1418        struct strbuf buf = STRBUF_INIT;
1419        const char *cp;
1420        int ch;
1421
1422        end_url_with_slash(&buf, base);
1423
1424        for (cp = ref; (ch = *cp) != 0; cp++)
1425                if (needs_quote(ch))
1426                        strbuf_addf(&buf, "%%%02x", ch);
1427                else
1428                        strbuf_addch(&buf, *cp);
1429
1430        return strbuf_detach(&buf, NULL);
1431}
1432
1433void append_remote_object_url(struct strbuf *buf, const char *url,
1434                              const char *hex,
1435                              int only_two_digit_prefix)
1436{
1437        end_url_with_slash(buf, url);
1438
1439        strbuf_addf(buf, "objects/%.*s/", 2, hex);
1440        if (!only_two_digit_prefix)
1441                strbuf_addstr(buf, hex + 2);
1442}
1443
1444char *get_remote_object_url(const char *url, const char *hex,
1445                            int only_two_digit_prefix)
1446{
1447        struct strbuf buf = STRBUF_INIT;
1448        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1449        return strbuf_detach(&buf, NULL);
1450}
1451
1452static int handle_curl_result(struct slot_results *results)
1453{
1454        /*
1455         * If we see a failing http code with CURLE_OK, we have turned off
1456         * FAILONERROR (to keep the server's custom error response), and should
1457         * translate the code into failure here.
1458         *
1459         * Likewise, if we see a redirect (30x code), that means we turned off
1460         * redirect-following, and we should treat the result as an error.
1461         */
1462        if (results->curl_result == CURLE_OK &&
1463            results->http_code >= 300) {
1464                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1465                /*
1466                 * Normally curl will already have put the "reason phrase"
1467                 * from the server into curl_errorstr; unfortunately without
1468                 * FAILONERROR it is lost, so we can give only the numeric
1469                 * status code.
1470                 */
1471                xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1472                          "The requested URL returned error: %ld",
1473                          results->http_code);
1474        }
1475
1476        if (results->curl_result == CURLE_OK) {
1477                credential_approve(&http_auth);
1478                if (proxy_auth.password)
1479                        credential_approve(&proxy_auth);
1480                return HTTP_OK;
1481        } else if (missing_target(results))
1482                return HTTP_MISSING_TARGET;
1483        else if (results->http_code == 401) {
1484                if (http_auth.username && http_auth.password) {
1485                        credential_reject(&http_auth);
1486                        return HTTP_NOAUTH;
1487                } else {
1488#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1489                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1490                        if (results->auth_avail) {
1491                                http_auth_methods &= results->auth_avail;
1492                                http_auth_methods_restricted = 1;
1493                        }
1494#endif
1495                        return HTTP_REAUTH;
1496                }
1497        } else {
1498                if (results->http_connectcode == 407)
1499                        credential_reject(&proxy_auth);
1500#if LIBCURL_VERSION_NUM >= 0x070c00
1501                if (!curl_errorstr[0])
1502                        strlcpy(curl_errorstr,
1503                                curl_easy_strerror(results->curl_result),
1504                                sizeof(curl_errorstr));
1505#endif
1506                return HTTP_ERROR;
1507        }
1508}
1509
1510int run_one_slot(struct active_request_slot *slot,
1511                 struct slot_results *results)
1512{
1513        slot->results = results;
1514        if (!start_active_slot(slot)) {
1515                xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1516                          "failed to start HTTP request");
1517                return HTTP_START_FAILED;
1518        }
1519
1520        run_active_slot(slot);
1521        return handle_curl_result(results);
1522}
1523
1524struct curl_slist *http_copy_default_headers(void)
1525{
1526        struct curl_slist *headers = NULL, *h;
1527
1528        for (h = extra_http_headers; h; h = h->next)
1529                headers = curl_slist_append(headers, h->data);
1530
1531        return headers;
1532}
1533
1534static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1535{
1536        char *ptr;
1537        CURLcode ret;
1538
1539        strbuf_reset(buf);
1540        ret = curl_easy_getinfo(curl, info, &ptr);
1541        if (!ret && ptr)
1542                strbuf_addstr(buf, ptr);
1543        return ret;
1544}
1545
1546/*
1547 * Check for and extract a content-type parameter. "raw"
1548 * should be positioned at the start of the potential
1549 * parameter, with any whitespace already removed.
1550 *
1551 * "name" is the name of the parameter. The value is appended
1552 * to "out".
1553 */
1554static int extract_param(const char *raw, const char *name,
1555                         struct strbuf *out)
1556{
1557        size_t len = strlen(name);
1558
1559        if (strncasecmp(raw, name, len))
1560                return -1;
1561        raw += len;
1562
1563        if (*raw != '=')
1564                return -1;
1565        raw++;
1566
1567        while (*raw && !isspace(*raw) && *raw != ';')
1568                strbuf_addch(out, *raw++);
1569        return 0;
1570}
1571
1572/*
1573 * Extract a normalized version of the content type, with any
1574 * spaces suppressed, all letters lowercased, and no trailing ";"
1575 * or parameters.
1576 *
1577 * Note that we will silently remove even invalid whitespace. For
1578 * example, "text / plain" is specifically forbidden by RFC 2616,
1579 * but "text/plain" is the only reasonable output, and this keeps
1580 * our code simple.
1581 *
1582 * If the "charset" argument is not NULL, store the value of any
1583 * charset parameter there.
1584 *
1585 * Example:
1586 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1587 *   "text / plain" -> "text/plain"
1588 */
1589static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1590                                 struct strbuf *charset)
1591{
1592        const char *p;
1593
1594        strbuf_reset(type);
1595        strbuf_grow(type, raw->len);
1596        for (p = raw->buf; *p; p++) {
1597                if (isspace(*p))
1598                        continue;
1599                if (*p == ';') {
1600                        p++;
1601                        break;
1602                }
1603                strbuf_addch(type, tolower(*p));
1604        }
1605
1606        if (!charset)
1607                return;
1608
1609        strbuf_reset(charset);
1610        while (*p) {
1611                while (isspace(*p) || *p == ';')
1612                        p++;
1613                if (!extract_param(p, "charset", charset))
1614                        return;
1615                while (*p && !isspace(*p))
1616                        p++;
1617        }
1618
1619        if (!charset->len && starts_with(type->buf, "text/"))
1620                strbuf_addstr(charset, "ISO-8859-1");
1621}
1622
1623static void write_accept_language(struct strbuf *buf)
1624{
1625        /*
1626         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1627         * that, q-value will be smaller than 0.001, the minimum q-value the
1628         * HTTP specification allows. See
1629         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1630         */
1631        const int MAX_DECIMAL_PLACES = 3;
1632        const int MAX_LANGUAGE_TAGS = 1000;
1633        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1634        char **language_tags = NULL;
1635        int num_langs = 0;
1636        const char *s = get_preferred_languages();
1637        int i;
1638        struct strbuf tag = STRBUF_INIT;
1639
1640        /* Don't add Accept-Language header if no language is preferred. */
1641        if (!s)
1642                return;
1643
1644        /*
1645         * Split the colon-separated string of preferred languages into
1646         * language_tags array.
1647         */
1648        do {
1649                /* collect language tag */
1650                for (; *s && (isalnum(*s) || *s == '_'); s++)
1651                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1652
1653                /* skip .codeset, @modifier and any other unnecessary parts */
1654                while (*s && *s != ':')
1655                        s++;
1656
1657                if (tag.len) {
1658                        num_langs++;
1659                        REALLOC_ARRAY(language_tags, num_langs);
1660                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1661                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1662                                break;
1663                }
1664        } while (*s++);
1665
1666        /* write Accept-Language header into buf */
1667        if (num_langs) {
1668                int last_buf_len = 0;
1669                int max_q;
1670                int decimal_places;
1671                char q_format[32];
1672
1673                /* add '*' */
1674                REALLOC_ARRAY(language_tags, num_langs + 1);
1675                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1676
1677                /* compute decimal_places */
1678                for (max_q = 1, decimal_places = 0;
1679                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1680                     decimal_places++, max_q *= 10)
1681                        ;
1682
1683                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1684
1685                strbuf_addstr(buf, "Accept-Language: ");
1686
1687                for (i = 0; i < num_langs; i++) {
1688                        if (i > 0)
1689                                strbuf_addstr(buf, ", ");
1690
1691                        strbuf_addstr(buf, language_tags[i]);
1692
1693                        if (i > 0)
1694                                strbuf_addf(buf, q_format, max_q - i);
1695
1696                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1697                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1698                                break;
1699                        }
1700
1701                        last_buf_len = buf->len;
1702                }
1703        }
1704
1705        /* free language tags -- last one is a static '*' */
1706        for (i = 0; i < num_langs - 1; i++)
1707                free(language_tags[i]);
1708        free(language_tags);
1709}
1710
1711/*
1712 * Get an Accept-Language header which indicates user's preferred languages.
1713 *
1714 * Examples:
1715 *   LANGUAGE= -> ""
1716 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1717 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1718 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1719 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1720 *   LANGUAGE= LANG=C -> ""
1721 */
1722static const char *get_accept_language(void)
1723{
1724        if (!cached_accept_language) {
1725                struct strbuf buf = STRBUF_INIT;
1726                write_accept_language(&buf);
1727                if (buf.len > 0)
1728                        cached_accept_language = strbuf_detach(&buf, NULL);
1729        }
1730
1731        return cached_accept_language;
1732}
1733
1734static void http_opt_request_remainder(CURL *curl, off_t pos)
1735{
1736        char buf[128];
1737        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1738        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1739}
1740
1741/* http_request() targets */
1742#define HTTP_REQUEST_STRBUF     0
1743#define HTTP_REQUEST_FILE       1
1744
1745static int http_request(const char *url,
1746                        void *result, int target,
1747                        const struct http_get_options *options)
1748{
1749        struct active_request_slot *slot;
1750        struct slot_results results;
1751        struct curl_slist *headers = http_copy_default_headers();
1752        struct strbuf buf = STRBUF_INIT;
1753        const char *accept_language;
1754        int ret;
1755
1756        slot = get_active_slot();
1757        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1758
1759        if (result == NULL) {
1760                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1761        } else {
1762                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1763                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1764
1765                if (target == HTTP_REQUEST_FILE) {
1766                        off_t posn = ftello(result);
1767                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1768                                         fwrite);
1769                        if (posn > 0)
1770                                http_opt_request_remainder(slot->curl, posn);
1771                } else
1772                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1773                                         fwrite_buffer);
1774        }
1775
1776        accept_language = get_accept_language();
1777
1778        if (accept_language)
1779                headers = curl_slist_append(headers, accept_language);
1780
1781        strbuf_addstr(&buf, "Pragma:");
1782        if (options && options->no_cache)
1783                strbuf_addstr(&buf, " no-cache");
1784        if (options && options->keep_error)
1785                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1786        if (options && options->initial_request &&
1787            http_follow_config == HTTP_FOLLOW_INITIAL)
1788                curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1789
1790        headers = curl_slist_append(headers, buf.buf);
1791
1792        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1793        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1794        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1795
1796        ret = run_one_slot(slot, &results);
1797
1798        if (options && options->content_type) {
1799                struct strbuf raw = STRBUF_INIT;
1800                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1801                extract_content_type(&raw, options->content_type,
1802                                     options->charset);
1803                strbuf_release(&raw);
1804        }
1805
1806        if (options && options->effective_url)
1807                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1808                                options->effective_url);
1809
1810        curl_slist_free_all(headers);
1811        strbuf_release(&buf);
1812
1813        return ret;
1814}
1815
1816/*
1817 * Update the "base" url to a more appropriate value, as deduced by
1818 * redirects seen when requesting a URL starting with "url".
1819 *
1820 * The "asked" parameter is a URL that we asked curl to access, and must begin
1821 * with "base".
1822 *
1823 * The "got" parameter is the URL that curl reported to us as where we ended
1824 * up.
1825 *
1826 * Returns 1 if we updated the base url, 0 otherwise.
1827 *
1828 * Our basic strategy is to compare "base" and "asked" to find the bits
1829 * specific to our request. We then strip those bits off of "got" to yield the
1830 * new base. So for example, if our base is "http://example.com/foo.git",
1831 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1832 * with "https://other.example.com/foo.git/info/refs". We would want the
1833 * new URL to become "https://other.example.com/foo.git".
1834 *
1835 * Note that this assumes a sane redirect scheme. It's entirely possible
1836 * in the example above to end up at a URL that does not even end in
1837 * "info/refs".  In such a case we die. There's not much we can do, such a
1838 * scheme is unlikely to represent a real git repository, and failing to
1839 * rewrite the base opens options for malicious redirects to do funny things.
1840 */
1841static int update_url_from_redirect(struct strbuf *base,
1842                                    const char *asked,
1843                                    const struct strbuf *got)
1844{
1845        const char *tail;
1846        size_t new_len;
1847
1848        if (!strcmp(asked, got->buf))
1849                return 0;
1850
1851        if (!skip_prefix(asked, base->buf, &tail))
1852                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1853                    asked, base->buf);
1854
1855        new_len = got->len;
1856        if (!strip_suffix_mem(got->buf, &new_len, tail))
1857                die(_("unable to update url base from redirection:\n"
1858                      "  asked for: %s\n"
1859                      "   redirect: %s"),
1860                    asked, got->buf);
1861
1862        strbuf_reset(base);
1863        strbuf_add(base, got->buf, new_len);
1864
1865        return 1;
1866}
1867
1868static int http_request_reauth(const char *url,
1869                               void *result, int target,
1870                               struct http_get_options *options)
1871{
1872        int ret = http_request(url, result, target, options);
1873
1874        if (ret != HTTP_OK && ret != HTTP_REAUTH)
1875                return ret;
1876
1877        if (options && options->effective_url && options->base_url) {
1878                if (update_url_from_redirect(options->base_url,
1879                                             url, options->effective_url)) {
1880                        credential_from_url(&http_auth, options->base_url->buf);
1881                        url = options->effective_url->buf;
1882                }
1883        }
1884
1885        if (ret != HTTP_REAUTH)
1886                return ret;
1887
1888        /*
1889         * If we are using KEEP_ERROR, the previous request may have
1890         * put cruft into our output stream; we should clear it out before
1891         * making our next request. We only know how to do this for
1892         * the strbuf case, but that is enough to satisfy current callers.
1893         */
1894        if (options && options->keep_error) {
1895                switch (target) {
1896                case HTTP_REQUEST_STRBUF:
1897                        strbuf_reset(result);
1898                        break;
1899                default:
1900                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1901                }
1902        }
1903
1904        credential_fill(&http_auth);
1905
1906        return http_request(url, result, target, options);
1907}
1908
1909int http_get_strbuf(const char *url,
1910                    struct strbuf *result,
1911                    struct http_get_options *options)
1912{
1913        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1914}
1915
1916/*
1917 * Downloads a URL and stores the result in the given file.
1918 *
1919 * If a previous interrupted download is detected (i.e. a previous temporary
1920 * file is still around) the download is resumed.
1921 */
1922static int http_get_file(const char *url, const char *filename,
1923                         struct http_get_options *options)
1924{
1925        int ret;
1926        struct strbuf tmpfile = STRBUF_INIT;
1927        FILE *result;
1928
1929        strbuf_addf(&tmpfile, "%s.temp", filename);
1930        result = fopen(tmpfile.buf, "a");
1931        if (!result) {
1932                error("Unable to open local file %s", tmpfile.buf);
1933                ret = HTTP_ERROR;
1934                goto cleanup;
1935        }
1936
1937        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1938        fclose(result);
1939
1940        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1941                ret = HTTP_ERROR;
1942cleanup:
1943        strbuf_release(&tmpfile);
1944        return ret;
1945}
1946
1947int http_fetch_ref(const char *base, struct ref *ref)
1948{
1949        struct http_get_options options = {0};
1950        char *url;
1951        struct strbuf buffer = STRBUF_INIT;
1952        int ret = -1;
1953
1954        options.no_cache = 1;
1955
1956        url = quote_ref_url(base, ref->name);
1957        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1958                strbuf_rtrim(&buffer);
1959                if (buffer.len == 40)
1960                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
1961                else if (starts_with(buffer.buf, "ref: ")) {
1962                        ref->symref = xstrdup(buffer.buf + 5);
1963                        ret = 0;
1964                }
1965        }
1966
1967        strbuf_release(&buffer);
1968        free(url);
1969        return ret;
1970}
1971
1972/* Helpers for fetching packs */
1973static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1974{
1975        char *url, *tmp;
1976        struct strbuf buf = STRBUF_INIT;
1977
1978        if (http_is_verbose)
1979                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1980
1981        end_url_with_slash(&buf, base_url);
1982        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1983        url = strbuf_detach(&buf, NULL);
1984
1985        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1986        tmp = strbuf_detach(&buf, NULL);
1987
1988        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1989                error("Unable to get pack index %s", url);
1990                FREE_AND_NULL(tmp);
1991        }
1992
1993        free(url);
1994        return tmp;
1995}
1996
1997static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1998        unsigned char *sha1, const char *base_url)
1999{
2000        struct packed_git *new_pack;
2001        char *tmp_idx = NULL;
2002        int ret;
2003
2004        if (has_pack_index(sha1)) {
2005                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2006                if (!new_pack)
2007                        return -1; /* parse_pack_index() already issued error message */
2008                goto add_pack;
2009        }
2010
2011        tmp_idx = fetch_pack_index(sha1, base_url);
2012        if (!tmp_idx)
2013                return -1;
2014
2015        new_pack = parse_pack_index(sha1, tmp_idx);
2016        if (!new_pack) {
2017                unlink(tmp_idx);
2018                free(tmp_idx);
2019
2020                return -1; /* parse_pack_index() already issued error message */
2021        }
2022
2023        ret = verify_pack_index(new_pack);
2024        if (!ret) {
2025                close_pack_index(new_pack);
2026                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2027        }
2028        free(tmp_idx);
2029        if (ret)
2030                return -1;
2031
2032add_pack:
2033        new_pack->next = *packs_head;
2034        *packs_head = new_pack;
2035        return 0;
2036}
2037
2038int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2039{
2040        struct http_get_options options = {0};
2041        int ret = 0, i = 0;
2042        char *url, *data;
2043        struct strbuf buf = STRBUF_INIT;
2044        unsigned char sha1[20];
2045
2046        end_url_with_slash(&buf, base_url);
2047        strbuf_addstr(&buf, "objects/info/packs");
2048        url = strbuf_detach(&buf, NULL);
2049
2050        options.no_cache = 1;
2051        ret = http_get_strbuf(url, &buf, &options);
2052        if (ret != HTTP_OK)
2053                goto cleanup;
2054
2055        data = buf.buf;
2056        while (i < buf.len) {
2057                switch (data[i]) {
2058                case 'P':
2059                        i++;
2060                        if (i + 52 <= buf.len &&
2061                            starts_with(data + i, " pack-") &&
2062                            starts_with(data + i + 46, ".pack\n")) {
2063                                get_sha1_hex(data + i + 6, sha1);
2064                                fetch_and_setup_pack_index(packs_head, sha1,
2065                                                      base_url);
2066                                i += 51;
2067                                break;
2068                        }
2069                default:
2070                        while (i < buf.len && data[i] != '\n')
2071                                i++;
2072                }
2073                i++;
2074        }
2075
2076cleanup:
2077        free(url);
2078        return ret;
2079}
2080
2081void release_http_pack_request(struct http_pack_request *preq)
2082{
2083        if (preq->packfile != NULL) {
2084                fclose(preq->packfile);
2085                preq->packfile = NULL;
2086        }
2087        preq->slot = NULL;
2088        free(preq->url);
2089        free(preq);
2090}
2091
2092int finish_http_pack_request(struct http_pack_request *preq)
2093{
2094        struct packed_git **lst;
2095        struct packed_git *p = preq->target;
2096        char *tmp_idx;
2097        size_t len;
2098        struct child_process ip = CHILD_PROCESS_INIT;
2099
2100        close_pack_index(p);
2101
2102        fclose(preq->packfile);
2103        preq->packfile = NULL;
2104
2105        lst = preq->lst;
2106        while (*lst != p)
2107                lst = &((*lst)->next);
2108        *lst = (*lst)->next;
2109
2110        if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2111                die("BUG: pack tmpfile does not end in .pack.temp?");
2112        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2113
2114        argv_array_push(&ip.args, "index-pack");
2115        argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2116        argv_array_push(&ip.args, preq->tmpfile);
2117        ip.git_cmd = 1;
2118        ip.no_stdin = 1;
2119        ip.no_stdout = 1;
2120
2121        if (run_command(&ip)) {
2122                unlink(preq->tmpfile);
2123                unlink(tmp_idx);
2124                free(tmp_idx);
2125                return -1;
2126        }
2127
2128        unlink(sha1_pack_index_name(p->sha1));
2129
2130        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2131         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2132                free(tmp_idx);
2133                return -1;
2134        }
2135
2136        install_packed_git(p);
2137        free(tmp_idx);
2138        return 0;
2139}
2140
2141struct http_pack_request *new_http_pack_request(
2142        struct packed_git *target, const char *base_url)
2143{
2144        off_t prev_posn = 0;
2145        struct strbuf buf = STRBUF_INIT;
2146        struct http_pack_request *preq;
2147
2148        preq = xcalloc(1, sizeof(*preq));
2149        preq->target = target;
2150
2151        end_url_with_slash(&buf, base_url);
2152        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2153                sha1_to_hex(target->sha1));
2154        preq->url = strbuf_detach(&buf, NULL);
2155
2156        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2157                sha1_pack_name(target->sha1));
2158        preq->packfile = fopen(preq->tmpfile, "a");
2159        if (!preq->packfile) {
2160                error("Unable to open local file %s for pack",
2161                      preq->tmpfile);
2162                goto abort;
2163        }
2164
2165        preq->slot = get_active_slot();
2166        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2167        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2168        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2169        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2170                no_pragma_header);
2171
2172        /*
2173         * If there is data present from a previous transfer attempt,
2174         * resume where it left off
2175         */
2176        prev_posn = ftello(preq->packfile);
2177        if (prev_posn>0) {
2178                if (http_is_verbose)
2179                        fprintf(stderr,
2180                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2181                                sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2182                http_opt_request_remainder(preq->slot->curl, prev_posn);
2183        }
2184
2185        return preq;
2186
2187abort:
2188        free(preq->url);
2189        free(preq);
2190        return NULL;
2191}
2192
2193/* Helpers for fetching objects (loose) */
2194static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2195                               void *data)
2196{
2197        unsigned char expn[4096];
2198        size_t size = eltsize * nmemb;
2199        int posn = 0;
2200        struct http_object_request *freq = data;
2201        struct active_request_slot *slot = freq->slot;
2202
2203        if (slot) {
2204                CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2205                                                &slot->http_code);
2206                if (c != CURLE_OK)
2207                        die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2208                                curl_easy_strerror(c));
2209                if (slot->http_code >= 300)
2210                        return size;
2211        }
2212
2213        do {
2214                ssize_t retval = xwrite(freq->localfile,
2215                                        (char *) ptr + posn, size - posn);
2216                if (retval < 0)
2217                        return posn;
2218                posn += retval;
2219        } while (posn < size);
2220
2221        freq->stream.avail_in = size;
2222        freq->stream.next_in = (void *)ptr;
2223        do {
2224                freq->stream.next_out = expn;
2225                freq->stream.avail_out = sizeof(expn);
2226                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2227                git_SHA1_Update(&freq->c, expn,
2228                                sizeof(expn) - freq->stream.avail_out);
2229        } while (freq->stream.avail_in && freq->zret == Z_OK);
2230        return size;
2231}
2232
2233struct http_object_request *new_http_object_request(const char *base_url,
2234        unsigned char *sha1)
2235{
2236        char *hex = sha1_to_hex(sha1);
2237        struct strbuf filename = STRBUF_INIT;
2238        char prevfile[PATH_MAX];
2239        int prevlocal;
2240        char prev_buf[PREV_BUF_SIZE];
2241        ssize_t prev_read = 0;
2242        off_t prev_posn = 0;
2243        struct http_object_request *freq;
2244
2245        freq = xcalloc(1, sizeof(*freq));
2246        hashcpy(freq->sha1, sha1);
2247        freq->localfile = -1;
2248
2249        sha1_file_name(&filename, sha1);
2250        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2251                 "%s.temp", filename.buf);
2252
2253        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename.buf);
2254        unlink_or_warn(prevfile);
2255        rename(freq->tmpfile, prevfile);
2256        unlink_or_warn(freq->tmpfile);
2257        strbuf_release(&filename);
2258
2259        if (freq->localfile != -1)
2260                error("fd leakage in start: %d", freq->localfile);
2261        freq->localfile = open(freq->tmpfile,
2262                               O_WRONLY | O_CREAT | O_EXCL, 0666);
2263        /*
2264         * This could have failed due to the "lazy directory creation";
2265         * try to mkdir the last path component.
2266         */
2267        if (freq->localfile < 0 && errno == ENOENT) {
2268                char *dir = strrchr(freq->tmpfile, '/');
2269                if (dir) {
2270                        *dir = 0;
2271                        mkdir(freq->tmpfile, 0777);
2272                        *dir = '/';
2273                }
2274                freq->localfile = open(freq->tmpfile,
2275                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
2276        }
2277
2278        if (freq->localfile < 0) {
2279                error_errno("Couldn't create temporary file %s", freq->tmpfile);
2280                goto abort;
2281        }
2282
2283        git_inflate_init(&freq->stream);
2284
2285        git_SHA1_Init(&freq->c);
2286
2287        freq->url = get_remote_object_url(base_url, hex, 0);
2288
2289        /*
2290         * If a previous temp file is present, process what was already
2291         * fetched.
2292         */
2293        prevlocal = open(prevfile, O_RDONLY);
2294        if (prevlocal != -1) {
2295                do {
2296                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2297                        if (prev_read>0) {
2298                                if (fwrite_sha1_file(prev_buf,
2299                                                     1,
2300                                                     prev_read,
2301                                                     freq) == prev_read) {
2302                                        prev_posn += prev_read;
2303                                } else {
2304                                        prev_read = -1;
2305                                }
2306                        }
2307                } while (prev_read > 0);
2308                close(prevlocal);
2309        }
2310        unlink_or_warn(prevfile);
2311
2312        /*
2313         * Reset inflate/SHA1 if there was an error reading the previous temp
2314         * file; also rewind to the beginning of the local file.
2315         */
2316        if (prev_read == -1) {
2317                memset(&freq->stream, 0, sizeof(freq->stream));
2318                git_inflate_init(&freq->stream);
2319                git_SHA1_Init(&freq->c);
2320                if (prev_posn>0) {
2321                        prev_posn = 0;
2322                        lseek(freq->localfile, 0, SEEK_SET);
2323                        if (ftruncate(freq->localfile, 0) < 0) {
2324                                error_errno("Couldn't truncate temporary file %s",
2325                                            freq->tmpfile);
2326                                goto abort;
2327                        }
2328                }
2329        }
2330
2331        freq->slot = get_active_slot();
2332
2333        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2334        curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2335        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2336        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2337        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2338        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2339
2340        /*
2341         * If we have successfully processed data from a previous fetch
2342         * attempt, only fetch the data we don't already have.
2343         */
2344        if (prev_posn>0) {
2345                if (http_is_verbose)
2346                        fprintf(stderr,
2347                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2348                                hex, (uintmax_t)prev_posn);
2349                http_opt_request_remainder(freq->slot->curl, prev_posn);
2350        }
2351
2352        return freq;
2353
2354abort:
2355        free(freq->url);
2356        free(freq);
2357        return NULL;
2358}
2359
2360void process_http_object_request(struct http_object_request *freq)
2361{
2362        if (freq->slot == NULL)
2363                return;
2364        freq->curl_result = freq->slot->curl_result;
2365        freq->http_code = freq->slot->http_code;
2366        freq->slot = NULL;
2367}
2368
2369int finish_http_object_request(struct http_object_request *freq)
2370{
2371        struct stat st;
2372        struct strbuf filename = STRBUF_INIT;
2373
2374        close(freq->localfile);
2375        freq->localfile = -1;
2376
2377        process_http_object_request(freq);
2378
2379        if (freq->http_code == 416) {
2380                warning("requested range invalid; we may already have all the data.");
2381        } else if (freq->curl_result != CURLE_OK) {
2382                if (stat(freq->tmpfile, &st) == 0)
2383                        if (st.st_size == 0)
2384                                unlink_or_warn(freq->tmpfile);
2385                return -1;
2386        }
2387
2388        git_inflate_end(&freq->stream);
2389        git_SHA1_Final(freq->real_sha1, &freq->c);
2390        if (freq->zret != Z_STREAM_END) {
2391                unlink_or_warn(freq->tmpfile);
2392                return -1;
2393        }
2394        if (hashcmp(freq->sha1, freq->real_sha1)) {
2395                unlink_or_warn(freq->tmpfile);
2396                return -1;
2397        }
2398
2399        sha1_file_name(&filename, freq->sha1);
2400        freq->rename = finalize_object_file(freq->tmpfile, filename.buf);
2401        strbuf_release(&filename);
2402
2403        return freq->rename;
2404}
2405
2406void abort_http_object_request(struct http_object_request *freq)
2407{
2408        unlink_or_warn(freq->tmpfile);
2409
2410        release_http_object_request(freq);
2411}
2412
2413void release_http_object_request(struct http_object_request *freq)
2414{
2415        if (freq->localfile != -1) {
2416                close(freq->localfile);
2417                freq->localfile = -1;
2418        }
2419        if (freq->url != NULL) {
2420                FREE_AND_NULL(freq->url);
2421        }
2422        if (freq->slot != NULL) {
2423                freq->slot->callback_func = NULL;
2424                freq->slot->callback_data = NULL;
2425                release_active_slot(freq->slot);
2426                freq->slot = NULL;
2427        }
2428}