http.con commit msvc: add a compile-time flag to allow detailed heap debugging (556702f)
   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#include "object-store.h"
  18
  19static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
  20static int trace_curl_data = 1;
  21static struct string_list cookies_to_redact = STRING_LIST_INIT_DUP;
  22#if LIBCURL_VERSION_NUM >= 0x070a08
  23long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  24#else
  25long int git_curl_ipresolve;
  26#endif
  27int active_requests;
  28int http_is_verbose;
  29ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  30
  31#if LIBCURL_VERSION_NUM >= 0x070a06
  32#define LIBCURL_CAN_HANDLE_AUTH_ANY
  33#endif
  34
  35static int min_curl_sessions = 1;
  36static int curl_session_count;
  37#ifdef USE_CURL_MULTI
  38static int max_requests = -1;
  39static CURLM *curlm;
  40#endif
  41#ifndef NO_CURL_EASY_DUPHANDLE
  42static CURL *curl_default;
  43#endif
  44
  45#define PREV_BUF_SIZE 4096
  46
  47char curl_errorstr[CURL_ERROR_SIZE];
  48
  49static int curl_ssl_verify = -1;
  50static int curl_ssl_try;
  51static const char *curl_http_version = NULL;
  52static const char *ssl_cert;
  53static const char *ssl_cipherlist;
  54static const char *ssl_version;
  55static struct {
  56        const char *name;
  57        long ssl_version;
  58} sslversions[] = {
  59        { "sslv2", CURL_SSLVERSION_SSLv2 },
  60        { "sslv3", CURL_SSLVERSION_SSLv3 },
  61        { "tlsv1", CURL_SSLVERSION_TLSv1 },
  62#if LIBCURL_VERSION_NUM >= 0x072200
  63        { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  64        { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  65        { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  66#endif
  67#if LIBCURL_VERSION_NUM >= 0x073400
  68        { "tlsv1.3", CURL_SSLVERSION_TLSv1_3 },
  69#endif
  70};
  71#if LIBCURL_VERSION_NUM >= 0x070903
  72static const char *ssl_key;
  73#endif
  74#if LIBCURL_VERSION_NUM >= 0x070908
  75static const char *ssl_capath;
  76#endif
  77#if LIBCURL_VERSION_NUM >= 0x071304
  78static const char *curl_no_proxy;
  79#endif
  80#if LIBCURL_VERSION_NUM >= 0x072c00
  81static const char *ssl_pinnedkey;
  82#endif
  83static const char *ssl_cainfo;
  84static long curl_low_speed_limit = -1;
  85static long curl_low_speed_time = -1;
  86static int curl_ftp_no_epsv;
  87static const char *curl_http_proxy;
  88static const char *http_proxy_authmethod;
  89static struct {
  90        const char *name;
  91        long curlauth_param;
  92} proxy_authmethods[] = {
  93        { "basic", CURLAUTH_BASIC },
  94        { "digest", CURLAUTH_DIGEST },
  95        { "negotiate", CURLAUTH_GSSNEGOTIATE },
  96        { "ntlm", CURLAUTH_NTLM },
  97#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  98        { "anyauth", CURLAUTH_ANY },
  99#endif
 100        /*
 101         * CURLAUTH_DIGEST_IE has no corresponding command-line option in
 102         * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
 103         * here, too
 104         */
 105};
 106#ifdef CURLGSSAPI_DELEGATION_FLAG
 107static const char *curl_deleg;
 108static struct {
 109        const char *name;
 110        long curl_deleg_param;
 111} curl_deleg_levels[] = {
 112        { "none", CURLGSSAPI_DELEGATION_NONE },
 113        { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
 114        { "always", CURLGSSAPI_DELEGATION_FLAG },
 115};
 116#endif
 117
 118static struct credential proxy_auth = CREDENTIAL_INIT;
 119static const char *curl_proxyuserpwd;
 120static const char *curl_cookie_file;
 121static int curl_save_cookies;
 122struct credential http_auth = CREDENTIAL_INIT;
 123static int http_proactive_auth;
 124static const char *user_agent;
 125static int curl_empty_auth = -1;
 126
 127enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
 128
 129#if LIBCURL_VERSION_NUM >= 0x071700
 130/* Use CURLOPT_KEYPASSWD as is */
 131#elif LIBCURL_VERSION_NUM >= 0x070903
 132#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 133#else
 134#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 135#endif
 136
 137static struct credential cert_auth = CREDENTIAL_INIT;
 138static int ssl_cert_password_required;
 139#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 140static unsigned long http_auth_methods = CURLAUTH_ANY;
 141static int http_auth_methods_restricted;
 142/* Modes for which empty_auth cannot actually help us. */
 143static unsigned long empty_auth_useless =
 144        CURLAUTH_BASIC
 145#ifdef CURLAUTH_DIGEST_IE
 146        | CURLAUTH_DIGEST_IE
 147#endif
 148        | CURLAUTH_DIGEST;
 149#endif
 150
 151static struct curl_slist *pragma_header;
 152static struct curl_slist *no_pragma_header;
 153static struct curl_slist *extra_http_headers;
 154
 155static struct active_request_slot *active_queue_head;
 156
 157static char *cached_accept_language;
 158
 159static char *http_ssl_backend;
 160
 161static int http_schannel_check_revoke = 1;
 162/*
 163 * With the backend being set to `schannel`, setting sslCAinfo would override
 164 * the Certificate Store in cURL v7.60.0 and later, which is not what we want
 165 * by default.
 166 */
 167static int http_schannel_use_ssl_cainfo;
 168
 169size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 170{
 171        size_t size = eltsize * nmemb;
 172        struct buffer *buffer = buffer_;
 173
 174        if (size > buffer->buf.len - buffer->posn)
 175                size = buffer->buf.len - buffer->posn;
 176        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 177        buffer->posn += size;
 178
 179        return size / eltsize;
 180}
 181
 182#ifndef NO_CURL_IOCTL
 183curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 184{
 185        struct buffer *buffer = clientp;
 186
 187        switch (cmd) {
 188        case CURLIOCMD_NOP:
 189                return CURLIOE_OK;
 190
 191        case CURLIOCMD_RESTARTREAD:
 192                buffer->posn = 0;
 193                return CURLIOE_OK;
 194
 195        default:
 196                return CURLIOE_UNKNOWNCMD;
 197        }
 198}
 199#endif
 200
 201size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 202{
 203        size_t size = eltsize * nmemb;
 204        struct strbuf *buffer = buffer_;
 205
 206        strbuf_add(buffer, ptr, size);
 207        return nmemb;
 208}
 209
 210size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 211{
 212        return nmemb;
 213}
 214
 215static void closedown_active_slot(struct active_request_slot *slot)
 216{
 217        active_requests--;
 218        slot->in_use = 0;
 219}
 220
 221static void finish_active_slot(struct active_request_slot *slot)
 222{
 223        closedown_active_slot(slot);
 224        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 225
 226        if (slot->finished != NULL)
 227                (*slot->finished) = 1;
 228
 229        /* Store slot results so they can be read after the slot is reused */
 230        if (slot->results != NULL) {
 231                slot->results->curl_result = slot->curl_result;
 232                slot->results->http_code = slot->http_code;
 233#if LIBCURL_VERSION_NUM >= 0x070a08
 234                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 235                                  &slot->results->auth_avail);
 236#else
 237                slot->results->auth_avail = 0;
 238#endif
 239
 240                curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 241                        &slot->results->http_connectcode);
 242        }
 243
 244        /* Run callback if appropriate */
 245        if (slot->callback_func != NULL)
 246                slot->callback_func(slot->callback_data);
 247}
 248
 249static void xmulti_remove_handle(struct active_request_slot *slot)
 250{
 251#ifdef USE_CURL_MULTI
 252        curl_multi_remove_handle(curlm, slot->curl);
 253#endif
 254}
 255
 256#ifdef USE_CURL_MULTI
 257static void process_curl_messages(void)
 258{
 259        int num_messages;
 260        struct active_request_slot *slot;
 261        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 262
 263        while (curl_message != NULL) {
 264                if (curl_message->msg == CURLMSG_DONE) {
 265                        int curl_result = curl_message->data.result;
 266                        slot = active_queue_head;
 267                        while (slot != NULL &&
 268                               slot->curl != curl_message->easy_handle)
 269                                slot = slot->next;
 270                        if (slot != NULL) {
 271                                xmulti_remove_handle(slot);
 272                                slot->curl_result = curl_result;
 273                                finish_active_slot(slot);
 274                        } else {
 275                                fprintf(stderr, "Received DONE message for unknown request!\n");
 276                        }
 277                } else {
 278                        fprintf(stderr, "Unknown CURL message received: %d\n",
 279                                (int)curl_message->msg);
 280                }
 281                curl_message = curl_multi_info_read(curlm, &num_messages);
 282        }
 283}
 284#endif
 285
 286static int http_options(const char *var, const char *value, void *cb)
 287{
 288        if (!strcmp("http.version", var)) {
 289                return git_config_string(&curl_http_version, var, value);
 290        }
 291        if (!strcmp("http.sslverify", var)) {
 292                curl_ssl_verify = git_config_bool(var, value);
 293                return 0;
 294        }
 295        if (!strcmp("http.sslcipherlist", var))
 296                return git_config_string(&ssl_cipherlist, var, value);
 297        if (!strcmp("http.sslversion", var))
 298                return git_config_string(&ssl_version, var, value);
 299        if (!strcmp("http.sslcert", var))
 300                return git_config_pathname(&ssl_cert, var, value);
 301#if LIBCURL_VERSION_NUM >= 0x070903
 302        if (!strcmp("http.sslkey", var))
 303                return git_config_pathname(&ssl_key, var, value);
 304#endif
 305#if LIBCURL_VERSION_NUM >= 0x070908
 306        if (!strcmp("http.sslcapath", var))
 307                return git_config_pathname(&ssl_capath, var, value);
 308#endif
 309        if (!strcmp("http.sslcainfo", var))
 310                return git_config_pathname(&ssl_cainfo, var, value);
 311        if (!strcmp("http.sslcertpasswordprotected", var)) {
 312                ssl_cert_password_required = git_config_bool(var, value);
 313                return 0;
 314        }
 315        if (!strcmp("http.ssltry", var)) {
 316                curl_ssl_try = git_config_bool(var, value);
 317                return 0;
 318        }
 319        if (!strcmp("http.sslbackend", var)) {
 320                free(http_ssl_backend);
 321                http_ssl_backend = xstrdup_or_null(value);
 322                return 0;
 323        }
 324
 325        if (!strcmp("http.schannelcheckrevoke", var)) {
 326                http_schannel_check_revoke = git_config_bool(var, value);
 327                return 0;
 328        }
 329
 330        if (!strcmp("http.schannelusesslcainfo", var)) {
 331                http_schannel_use_ssl_cainfo = git_config_bool(var, value);
 332                return 0;
 333        }
 334
 335        if (!strcmp("http.minsessions", var)) {
 336                min_curl_sessions = git_config_int(var, value);
 337#ifndef USE_CURL_MULTI
 338                if (min_curl_sessions > 1)
 339                        min_curl_sessions = 1;
 340#endif
 341                return 0;
 342        }
 343#ifdef USE_CURL_MULTI
 344        if (!strcmp("http.maxrequests", var)) {
 345                max_requests = git_config_int(var, value);
 346                return 0;
 347        }
 348#endif
 349        if (!strcmp("http.lowspeedlimit", var)) {
 350                curl_low_speed_limit = (long)git_config_int(var, value);
 351                return 0;
 352        }
 353        if (!strcmp("http.lowspeedtime", var)) {
 354                curl_low_speed_time = (long)git_config_int(var, value);
 355                return 0;
 356        }
 357
 358        if (!strcmp("http.noepsv", var)) {
 359                curl_ftp_no_epsv = git_config_bool(var, value);
 360                return 0;
 361        }
 362        if (!strcmp("http.proxy", var))
 363                return git_config_string(&curl_http_proxy, var, value);
 364
 365        if (!strcmp("http.proxyauthmethod", var))
 366                return git_config_string(&http_proxy_authmethod, var, value);
 367
 368        if (!strcmp("http.cookiefile", var))
 369                return git_config_pathname(&curl_cookie_file, var, value);
 370        if (!strcmp("http.savecookies", var)) {
 371                curl_save_cookies = git_config_bool(var, value);
 372                return 0;
 373        }
 374
 375        if (!strcmp("http.postbuffer", var)) {
 376                http_post_buffer = git_config_ssize_t(var, value);
 377                if (http_post_buffer < 0)
 378                        warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
 379                if (http_post_buffer < LARGE_PACKET_MAX)
 380                        http_post_buffer = LARGE_PACKET_MAX;
 381                return 0;
 382        }
 383
 384        if (!strcmp("http.useragent", var))
 385                return git_config_string(&user_agent, var, value);
 386
 387        if (!strcmp("http.emptyauth", var)) {
 388                if (value && !strcmp("auto", value))
 389                        curl_empty_auth = -1;
 390                else
 391                        curl_empty_auth = git_config_bool(var, value);
 392                return 0;
 393        }
 394
 395        if (!strcmp("http.delegation", var)) {
 396#ifdef CURLGSSAPI_DELEGATION_FLAG
 397                return git_config_string(&curl_deleg, var, value);
 398#else
 399                warning(_("Delegation control is not supported with cURL < 7.22.0"));
 400                return 0;
 401#endif
 402        }
 403
 404        if (!strcmp("http.pinnedpubkey", var)) {
 405#if LIBCURL_VERSION_NUM >= 0x072c00
 406                return git_config_pathname(&ssl_pinnedkey, var, value);
 407#else
 408                warning(_("Public key pinning not supported with cURL < 7.44.0"));
 409                return 0;
 410#endif
 411        }
 412
 413        if (!strcmp("http.extraheader", var)) {
 414                if (!value) {
 415                        return config_error_nonbool(var);
 416                } else if (!*value) {
 417                        curl_slist_free_all(extra_http_headers);
 418                        extra_http_headers = NULL;
 419                } else {
 420                        extra_http_headers =
 421                                curl_slist_append(extra_http_headers, value);
 422                }
 423                return 0;
 424        }
 425
 426        if (!strcmp("http.followredirects", var)) {
 427                if (value && !strcmp(value, "initial"))
 428                        http_follow_config = HTTP_FOLLOW_INITIAL;
 429                else if (git_config_bool(var, value))
 430                        http_follow_config = HTTP_FOLLOW_ALWAYS;
 431                else
 432                        http_follow_config = HTTP_FOLLOW_NONE;
 433                return 0;
 434        }
 435
 436        /* Fall back on the default ones */
 437        return git_default_config(var, value, cb);
 438}
 439
 440static int curl_empty_auth_enabled(void)
 441{
 442        if (curl_empty_auth >= 0)
 443                return curl_empty_auth;
 444
 445#ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
 446        /*
 447         * Our libcurl is too old to do AUTH_ANY in the first place;
 448         * just default to turning the feature off.
 449         */
 450#else
 451        /*
 452         * In the automatic case, kick in the empty-auth
 453         * hack as long as we would potentially try some
 454         * method more exotic than "Basic" or "Digest".
 455         *
 456         * But only do this when this is our second or
 457         * subsequent request, as by then we know what
 458         * methods are available.
 459         */
 460        if (http_auth_methods_restricted &&
 461            (http_auth_methods & ~empty_auth_useless))
 462                return 1;
 463#endif
 464        return 0;
 465}
 466
 467static void init_curl_http_auth(CURL *result)
 468{
 469        if (!http_auth.username || !*http_auth.username) {
 470                if (curl_empty_auth_enabled())
 471                        curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 472                return;
 473        }
 474
 475        credential_fill(&http_auth);
 476
 477#if LIBCURL_VERSION_NUM >= 0x071301
 478        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 479        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 480#else
 481        {
 482                static struct strbuf up = STRBUF_INIT;
 483                /*
 484                 * Note that we assume we only ever have a single set of
 485                 * credentials in a given program run, so we do not have
 486                 * to worry about updating this buffer, only setting its
 487                 * initial value.
 488                 */
 489                if (!up.len)
 490                        strbuf_addf(&up, "%s:%s",
 491                                http_auth.username, http_auth.password);
 492                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 493        }
 494#endif
 495}
 496
 497/* *var must be free-able */
 498static void var_override(const char **var, char *value)
 499{
 500        if (value) {
 501                free((void *)*var);
 502                *var = xstrdup(value);
 503        }
 504}
 505
 506static void set_proxyauth_name_password(CURL *result)
 507{
 508#if LIBCURL_VERSION_NUM >= 0x071301
 509                curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 510                        proxy_auth.username);
 511                curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 512                        proxy_auth.password);
 513#else
 514                struct strbuf s = STRBUF_INIT;
 515
 516                strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 517                strbuf_addch(&s, ':');
 518                strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 519                curl_proxyuserpwd = strbuf_detach(&s, NULL);
 520                curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 521#endif
 522}
 523
 524static void init_curl_proxy_auth(CURL *result)
 525{
 526        if (proxy_auth.username) {
 527                if (!proxy_auth.password)
 528                        credential_fill(&proxy_auth);
 529                set_proxyauth_name_password(result);
 530        }
 531
 532        var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 533
 534#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 535        if (http_proxy_authmethod) {
 536                int i;
 537                for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 538                        if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 539                                curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 540                                                proxy_authmethods[i].curlauth_param);
 541                                break;
 542                        }
 543                }
 544                if (i == ARRAY_SIZE(proxy_authmethods)) {
 545                        warning("unsupported proxy authentication method %s: using anyauth",
 546                                        http_proxy_authmethod);
 547                        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 548                }
 549        }
 550        else
 551                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 552#endif
 553}
 554
 555static int has_cert_password(void)
 556{
 557        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 558                return 0;
 559        if (!cert_auth.password) {
 560                cert_auth.protocol = xstrdup("cert");
 561                cert_auth.username = xstrdup("");
 562                cert_auth.path = xstrdup(ssl_cert);
 563                credential_fill(&cert_auth);
 564        }
 565        return 1;
 566}
 567
 568#if LIBCURL_VERSION_NUM >= 0x071900
 569static void set_curl_keepalive(CURL *c)
 570{
 571        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 572}
 573
 574#elif LIBCURL_VERSION_NUM >= 0x071000
 575static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 576{
 577        int ka = 1;
 578        int rc;
 579        socklen_t len = (socklen_t)sizeof(ka);
 580
 581        if (type != CURLSOCKTYPE_IPCXN)
 582                return 0;
 583
 584        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 585        if (rc < 0)
 586                warning_errno("unable to set SO_KEEPALIVE on socket");
 587
 588        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 589}
 590
 591static void set_curl_keepalive(CURL *c)
 592{
 593        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 594}
 595
 596#else
 597static void set_curl_keepalive(CURL *c)
 598{
 599        /* not supported on older curl versions */
 600}
 601#endif
 602
 603static void redact_sensitive_header(struct strbuf *header)
 604{
 605        const char *sensitive_header;
 606
 607        if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 608            skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 609                /* The first token is the type, which is OK to log */
 610                while (isspace(*sensitive_header))
 611                        sensitive_header++;
 612                while (*sensitive_header && !isspace(*sensitive_header))
 613                        sensitive_header++;
 614                /* Everything else is opaque and possibly sensitive */
 615                strbuf_setlen(header,  sensitive_header - header->buf);
 616                strbuf_addstr(header, " <redacted>");
 617        } else if (cookies_to_redact.nr &&
 618                   skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
 619                struct strbuf redacted_header = STRBUF_INIT;
 620                char *cookie;
 621
 622                while (isspace(*sensitive_header))
 623                        sensitive_header++;
 624
 625                /*
 626                 * The contents of header starting from sensitive_header will
 627                 * subsequently be overridden, so it is fine to mutate this
 628                 * string (hence the assignment to "char *").
 629                 */
 630                cookie = (char *) sensitive_header;
 631
 632                while (cookie) {
 633                        char *equals;
 634                        char *semicolon = strstr(cookie, "; ");
 635                        if (semicolon)
 636                                *semicolon = 0;
 637                        equals = strchrnul(cookie, '=');
 638                        if (!equals) {
 639                                /* invalid cookie, just append and continue */
 640                                strbuf_addstr(&redacted_header, cookie);
 641                                continue;
 642                        }
 643                        *equals = 0; /* temporarily set to NUL for lookup */
 644                        if (string_list_lookup(&cookies_to_redact, cookie)) {
 645                                strbuf_addstr(&redacted_header, cookie);
 646                                strbuf_addstr(&redacted_header, "=<redacted>");
 647                        } else {
 648                                *equals = '=';
 649                                strbuf_addstr(&redacted_header, cookie);
 650                        }
 651                        if (semicolon) {
 652                                /*
 653                                 * There are more cookies. (Or, for some
 654                                 * reason, the input string ends in "; ".)
 655                                 */
 656                                strbuf_addstr(&redacted_header, "; ");
 657                                cookie = semicolon + strlen("; ");
 658                        } else {
 659                                cookie = NULL;
 660                        }
 661                }
 662
 663                strbuf_setlen(header, sensitive_header - header->buf);
 664                strbuf_addbuf(header, &redacted_header);
 665        }
 666}
 667
 668static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 669{
 670        struct strbuf out = STRBUF_INIT;
 671        struct strbuf **headers, **header;
 672
 673        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 674                text, (long)size, (long)size);
 675        trace_strbuf(&trace_curl, &out);
 676        strbuf_reset(&out);
 677        strbuf_add(&out, ptr, size);
 678        headers = strbuf_split_max(&out, '\n', 0);
 679
 680        for (header = headers; *header; header++) {
 681                if (hide_sensitive_header)
 682                        redact_sensitive_header(*header);
 683                strbuf_insert((*header), 0, text, strlen(text));
 684                strbuf_insert((*header), strlen(text), ": ", 2);
 685                strbuf_rtrim((*header));
 686                strbuf_addch((*header), '\n');
 687                trace_strbuf(&trace_curl, (*header));
 688        }
 689        strbuf_list_free(headers);
 690        strbuf_release(&out);
 691}
 692
 693static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 694{
 695        size_t i;
 696        struct strbuf out = STRBUF_INIT;
 697        unsigned int width = 60;
 698
 699        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 700                text, (long)size, (long)size);
 701        trace_strbuf(&trace_curl, &out);
 702
 703        for (i = 0; i < size; i += width) {
 704                size_t w;
 705
 706                strbuf_reset(&out);
 707                strbuf_addf(&out, "%s: ", text);
 708                for (w = 0; (w < width) && (i + w < size); w++) {
 709                        unsigned char ch = ptr[i + w];
 710
 711                        strbuf_addch(&out,
 712                                       (ch >= 0x20) && (ch < 0x80)
 713                                       ? ch : '.');
 714                }
 715                strbuf_addch(&out, '\n');
 716                trace_strbuf(&trace_curl, &out);
 717        }
 718        strbuf_release(&out);
 719}
 720
 721static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 722{
 723        const char *text;
 724        enum { NO_FILTER = 0, DO_FILTER = 1 };
 725
 726        switch (type) {
 727        case CURLINFO_TEXT:
 728                trace_printf_key(&trace_curl, "== Info: %s", data);
 729                break;
 730        case CURLINFO_HEADER_OUT:
 731                text = "=> Send header";
 732                curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 733                break;
 734        case CURLINFO_DATA_OUT:
 735                if (trace_curl_data) {
 736                        text = "=> Send data";
 737                        curl_dump_data(text, (unsigned char *)data, size);
 738                }
 739                break;
 740        case CURLINFO_SSL_DATA_OUT:
 741                if (trace_curl_data) {
 742                        text = "=> Send SSL data";
 743                        curl_dump_data(text, (unsigned char *)data, size);
 744                }
 745                break;
 746        case CURLINFO_HEADER_IN:
 747                text = "<= Recv header";
 748                curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 749                break;
 750        case CURLINFO_DATA_IN:
 751                if (trace_curl_data) {
 752                        text = "<= Recv data";
 753                        curl_dump_data(text, (unsigned char *)data, size);
 754                }
 755                break;
 756        case CURLINFO_SSL_DATA_IN:
 757                if (trace_curl_data) {
 758                        text = "<= Recv SSL data";
 759                        curl_dump_data(text, (unsigned char *)data, size);
 760                }
 761                break;
 762
 763        default:                /* we ignore unknown types by default */
 764                return 0;
 765        }
 766        return 0;
 767}
 768
 769void setup_curl_trace(CURL *handle)
 770{
 771        if (!trace_want(&trace_curl))
 772                return;
 773        curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 774        curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 775        curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 776}
 777
 778#ifdef CURLPROTO_HTTP
 779static long get_curl_allowed_protocols(int from_user)
 780{
 781        long allowed_protocols = 0;
 782
 783        if (is_transport_allowed("http", from_user))
 784                allowed_protocols |= CURLPROTO_HTTP;
 785        if (is_transport_allowed("https", from_user))
 786                allowed_protocols |= CURLPROTO_HTTPS;
 787        if (is_transport_allowed("ftp", from_user))
 788                allowed_protocols |= CURLPROTO_FTP;
 789        if (is_transport_allowed("ftps", from_user))
 790                allowed_protocols |= CURLPROTO_FTPS;
 791
 792        return allowed_protocols;
 793}
 794#endif
 795
 796#if LIBCURL_VERSION_NUM >=0x072f00
 797static int get_curl_http_version_opt(const char *version_string, long *opt)
 798{
 799        int i;
 800        static struct {
 801                const char *name;
 802                long opt_token;
 803        } choice[] = {
 804                { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
 805                { "HTTP/2", CURL_HTTP_VERSION_2 }
 806        };
 807
 808        for (i = 0; i < ARRAY_SIZE(choice); i++) {
 809                if (!strcmp(version_string, choice[i].name)) {
 810                        *opt = choice[i].opt_token;
 811                        return 0;
 812                }
 813        }
 814
 815        warning("unknown value given to http.version: '%s'", version_string);
 816        return -1; /* not found */
 817}
 818
 819#endif
 820
 821static CURL *get_curl_handle(void)
 822{
 823        CURL *result = curl_easy_init();
 824
 825        if (!result)
 826                die("curl_easy_init failed");
 827
 828        if (!curl_ssl_verify) {
 829                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 830                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 831        } else {
 832                /* Verify authenticity of the peer's certificate */
 833                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 834                /* The name in the cert must match whom we tried to connect */
 835                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 836        }
 837
 838#if LIBCURL_VERSION_NUM >= 0x072f00 // 7.47.0
 839    if (curl_http_version) {
 840                long opt;
 841                if (!get_curl_http_version_opt(curl_http_version, &opt)) {
 842                        /* Set request use http version */
 843                        curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
 844                }
 845    }
 846#endif
 847
 848#if LIBCURL_VERSION_NUM >= 0x070907
 849        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 850#endif
 851#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 852        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 853#endif
 854
 855#ifdef CURLGSSAPI_DELEGATION_FLAG
 856        if (curl_deleg) {
 857                int i;
 858                for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
 859                        if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
 860                                curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
 861                                                curl_deleg_levels[i].curl_deleg_param);
 862                                break;
 863                        }
 864                }
 865                if (i == ARRAY_SIZE(curl_deleg_levels))
 866                        warning("Unknown delegation method '%s': using default",
 867                                curl_deleg);
 868        }
 869#endif
 870
 871        if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
 872            !http_schannel_check_revoke) {
 873#if LIBCURL_VERSION_NUM >= 0x072c00
 874                curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
 875#else
 876                warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
 877#endif
 878        }
 879
 880        if (http_proactive_auth)
 881                init_curl_http_auth(result);
 882
 883        if (getenv("GIT_SSL_VERSION"))
 884                ssl_version = getenv("GIT_SSL_VERSION");
 885        if (ssl_version && *ssl_version) {
 886                int i;
 887                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 888                        if (!strcmp(ssl_version, sslversions[i].name)) {
 889                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 890                                                 sslversions[i].ssl_version);
 891                                break;
 892                        }
 893                }
 894                if (i == ARRAY_SIZE(sslversions))
 895                        warning("unsupported ssl version %s: using default",
 896                                ssl_version);
 897        }
 898
 899        if (getenv("GIT_SSL_CIPHER_LIST"))
 900                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 901        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 902                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 903                                ssl_cipherlist);
 904
 905        if (ssl_cert != NULL)
 906                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 907        if (has_cert_password())
 908                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 909#if LIBCURL_VERSION_NUM >= 0x070903
 910        if (ssl_key != NULL)
 911                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 912#endif
 913#if LIBCURL_VERSION_NUM >= 0x070908
 914        if (ssl_capath != NULL)
 915                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 916#endif
 917#if LIBCURL_VERSION_NUM >= 0x072c00
 918        if (ssl_pinnedkey != NULL)
 919                curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 920#endif
 921        if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
 922            !http_schannel_use_ssl_cainfo) {
 923                curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
 924#if LIBCURL_VERSION_NUM >= 0x073400
 925                curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
 926#endif
 927        } else if (ssl_cainfo != NULL)
 928                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 929
 930        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 931                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 932                                 curl_low_speed_limit);
 933                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 934                                 curl_low_speed_time);
 935        }
 936
 937        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 938#if LIBCURL_VERSION_NUM >= 0x071301
 939        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 940#elif LIBCURL_VERSION_NUM >= 0x071101
 941        curl_easy_setopt(result, CURLOPT_POST301, 1);
 942#endif
 943#ifdef CURLPROTO_HTTP
 944        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
 945                         get_curl_allowed_protocols(0));
 946        curl_easy_setopt(result, CURLOPT_PROTOCOLS,
 947                         get_curl_allowed_protocols(-1));
 948#else
 949        warning(_("Protocol restrictions not supported with cURL < 7.19.4"));
 950#endif
 951        if (getenv("GIT_CURL_VERBOSE"))
 952                curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
 953        setup_curl_trace(result);
 954        if (getenv("GIT_TRACE_CURL_NO_DATA"))
 955                trace_curl_data = 0;
 956        if (getenv("GIT_REDACT_COOKIES")) {
 957                string_list_split(&cookies_to_redact,
 958                                  getenv("GIT_REDACT_COOKIES"), ',', -1);
 959                string_list_sort(&cookies_to_redact);
 960        }
 961
 962        curl_easy_setopt(result, CURLOPT_USERAGENT,
 963                user_agent ? user_agent : git_user_agent());
 964
 965        if (curl_ftp_no_epsv)
 966                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 967
 968#ifdef CURLOPT_USE_SSL
 969        if (curl_ssl_try)
 970                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 971#endif
 972
 973        /*
 974         * CURL also examines these variables as a fallback; but we need to query
 975         * them here in order to decide whether to prompt for missing password (cf.
 976         * init_curl_proxy_auth()).
 977         *
 978         * Unlike many other common environment variables, these are historically
 979         * lowercase only. It appears that CURL did not know this and implemented
 980         * only uppercase variants, which was later corrected to take both - with
 981         * the exception of http_proxy, which is lowercase only also in CURL. As
 982         * the lowercase versions are the historical quasi-standard, they take
 983         * precedence here, as in CURL.
 984         */
 985        if (!curl_http_proxy) {
 986                if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
 987                        var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 988                        var_override(&curl_http_proxy, getenv("https_proxy"));
 989                } else {
 990                        var_override(&curl_http_proxy, getenv("http_proxy"));
 991                }
 992                if (!curl_http_proxy) {
 993                        var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 994                        var_override(&curl_http_proxy, getenv("all_proxy"));
 995                }
 996        }
 997
 998        if (curl_http_proxy && curl_http_proxy[0] == '\0') {
 999                /*
1000                 * Handle case with the empty http.proxy value here to keep
1001                 * common code clean.
1002                 * NB: empty option disables proxying at all.
1003                 */
1004                curl_easy_setopt(result, CURLOPT_PROXY, "");
1005        } else if (curl_http_proxy) {
1006#if LIBCURL_VERSION_NUM >= 0x071800
1007                if (starts_with(curl_http_proxy, "socks5h"))
1008                        curl_easy_setopt(result,
1009                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
1010                else if (starts_with(curl_http_proxy, "socks5"))
1011                        curl_easy_setopt(result,
1012                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
1013                else if (starts_with(curl_http_proxy, "socks4a"))
1014                        curl_easy_setopt(result,
1015                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
1016                else if (starts_with(curl_http_proxy, "socks"))
1017                        curl_easy_setopt(result,
1018                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
1019#endif
1020#if LIBCURL_VERSION_NUM >= 0x073400
1021                else if (starts_with(curl_http_proxy, "https"))
1022                        curl_easy_setopt(result,
1023                                CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
1024#endif
1025                if (strstr(curl_http_proxy, "://"))
1026                        credential_from_url(&proxy_auth, curl_http_proxy);
1027                else {
1028                        struct strbuf url = STRBUF_INIT;
1029                        strbuf_addf(&url, "http://%s", curl_http_proxy);
1030                        credential_from_url(&proxy_auth, url.buf);
1031                        strbuf_release(&url);
1032                }
1033
1034                if (!proxy_auth.host)
1035                        die("Invalid proxy URL '%s'", curl_http_proxy);
1036
1037                curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
1038#if LIBCURL_VERSION_NUM >= 0x071304
1039                var_override(&curl_no_proxy, getenv("NO_PROXY"));
1040                var_override(&curl_no_proxy, getenv("no_proxy"));
1041                curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1042#endif
1043        }
1044        init_curl_proxy_auth(result);
1045
1046        set_curl_keepalive(result);
1047
1048        return result;
1049}
1050
1051static void set_from_env(const char **var, const char *envname)
1052{
1053        const char *val = getenv(envname);
1054        if (val)
1055                *var = val;
1056}
1057
1058void http_init(struct remote *remote, const char *url, int proactive_auth)
1059{
1060        char *low_speed_limit;
1061        char *low_speed_time;
1062        char *normalized_url;
1063        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
1064
1065        config.section = "http";
1066        config.key = NULL;
1067        config.collect_fn = http_options;
1068        config.cascade_fn = git_default_config;
1069        config.cb = NULL;
1070
1071        http_is_verbose = 0;
1072        normalized_url = url_normalize(url, &config.url);
1073
1074        git_config(urlmatch_config_entry, &config);
1075        free(normalized_url);
1076
1077#if LIBCURL_VERSION_NUM >= 0x073800
1078        if (http_ssl_backend) {
1079                const curl_ssl_backend **backends;
1080                struct strbuf buf = STRBUF_INIT;
1081                int i;
1082
1083                switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1084                case CURLSSLSET_UNKNOWN_BACKEND:
1085                        strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1086                                            "Supported SSL backends:"),
1087                                            http_ssl_backend);
1088                        for (i = 0; backends[i]; i++)
1089                                strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1090                        die("%s", buf.buf);
1091                case CURLSSLSET_NO_BACKENDS:
1092                        die(_("Could not set SSL backend to '%s': "
1093                              "cURL was built without SSL backends"),
1094                            http_ssl_backend);
1095                case CURLSSLSET_TOO_LATE:
1096                        die(_("Could not set SSL backend to '%s': already set"),
1097                            http_ssl_backend);
1098                case CURLSSLSET_OK:
1099                        break; /* Okay! */
1100                }
1101        }
1102#endif
1103
1104        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1105                die("curl_global_init failed");
1106
1107        http_proactive_auth = proactive_auth;
1108
1109        if (remote && remote->http_proxy)
1110                curl_http_proxy = xstrdup(remote->http_proxy);
1111
1112        if (remote)
1113                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1114
1115        pragma_header = curl_slist_append(http_copy_default_headers(),
1116                "Pragma: no-cache");
1117        no_pragma_header = curl_slist_append(http_copy_default_headers(),
1118                "Pragma:");
1119
1120#ifdef USE_CURL_MULTI
1121        {
1122                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1123                if (http_max_requests != NULL)
1124                        max_requests = atoi(http_max_requests);
1125        }
1126
1127        curlm = curl_multi_init();
1128        if (!curlm)
1129                die("curl_multi_init failed");
1130#endif
1131
1132        if (getenv("GIT_SSL_NO_VERIFY"))
1133                curl_ssl_verify = 0;
1134
1135        set_from_env(&ssl_cert, "GIT_SSL_CERT");
1136#if LIBCURL_VERSION_NUM >= 0x070903
1137        set_from_env(&ssl_key, "GIT_SSL_KEY");
1138#endif
1139#if LIBCURL_VERSION_NUM >= 0x070908
1140        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1141#endif
1142        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1143
1144        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1145
1146        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1147        if (low_speed_limit != NULL)
1148                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1149        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1150        if (low_speed_time != NULL)
1151                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1152
1153        if (curl_ssl_verify == -1)
1154                curl_ssl_verify = 1;
1155
1156        curl_session_count = 0;
1157#ifdef USE_CURL_MULTI
1158        if (max_requests < 1)
1159                max_requests = DEFAULT_MAX_REQUESTS;
1160#endif
1161
1162        if (getenv("GIT_CURL_FTP_NO_EPSV"))
1163                curl_ftp_no_epsv = 1;
1164
1165        if (url) {
1166                credential_from_url(&http_auth, url);
1167                if (!ssl_cert_password_required &&
1168                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1169                    starts_with(url, "https://"))
1170                        ssl_cert_password_required = 1;
1171        }
1172
1173#ifndef NO_CURL_EASY_DUPHANDLE
1174        curl_default = get_curl_handle();
1175#endif
1176}
1177
1178void http_cleanup(void)
1179{
1180        struct active_request_slot *slot = active_queue_head;
1181
1182        while (slot != NULL) {
1183                struct active_request_slot *next = slot->next;
1184                if (slot->curl != NULL) {
1185                        xmulti_remove_handle(slot);
1186                        curl_easy_cleanup(slot->curl);
1187                }
1188                free(slot);
1189                slot = next;
1190        }
1191        active_queue_head = NULL;
1192
1193#ifndef NO_CURL_EASY_DUPHANDLE
1194        curl_easy_cleanup(curl_default);
1195#endif
1196
1197#ifdef USE_CURL_MULTI
1198        curl_multi_cleanup(curlm);
1199#endif
1200        curl_global_cleanup();
1201
1202        curl_slist_free_all(extra_http_headers);
1203        extra_http_headers = NULL;
1204
1205        curl_slist_free_all(pragma_header);
1206        pragma_header = NULL;
1207
1208        curl_slist_free_all(no_pragma_header);
1209        no_pragma_header = NULL;
1210
1211        if (curl_http_proxy) {
1212                free((void *)curl_http_proxy);
1213                curl_http_proxy = NULL;
1214        }
1215
1216        if (proxy_auth.password) {
1217                memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1218                FREE_AND_NULL(proxy_auth.password);
1219        }
1220
1221        free((void *)curl_proxyuserpwd);
1222        curl_proxyuserpwd = NULL;
1223
1224        free((void *)http_proxy_authmethod);
1225        http_proxy_authmethod = NULL;
1226
1227        if (cert_auth.password != NULL) {
1228                memset(cert_auth.password, 0, strlen(cert_auth.password));
1229                FREE_AND_NULL(cert_auth.password);
1230        }
1231        ssl_cert_password_required = 0;
1232
1233        FREE_AND_NULL(cached_accept_language);
1234}
1235
1236struct active_request_slot *get_active_slot(void)
1237{
1238        struct active_request_slot *slot = active_queue_head;
1239        struct active_request_slot *newslot;
1240
1241#ifdef USE_CURL_MULTI
1242        int num_transfers;
1243
1244        /* Wait for a slot to open up if the queue is full */
1245        while (active_requests >= max_requests) {
1246                curl_multi_perform(curlm, &num_transfers);
1247                if (num_transfers < active_requests)
1248                        process_curl_messages();
1249        }
1250#endif
1251
1252        while (slot != NULL && slot->in_use)
1253                slot = slot->next;
1254
1255        if (slot == NULL) {
1256                newslot = xmalloc(sizeof(*newslot));
1257                newslot->curl = NULL;
1258                newslot->in_use = 0;
1259                newslot->next = NULL;
1260
1261                slot = active_queue_head;
1262                if (slot == NULL) {
1263                        active_queue_head = newslot;
1264                } else {
1265                        while (slot->next != NULL)
1266                                slot = slot->next;
1267                        slot->next = newslot;
1268                }
1269                slot = newslot;
1270        }
1271
1272        if (slot->curl == NULL) {
1273#ifdef NO_CURL_EASY_DUPHANDLE
1274                slot->curl = get_curl_handle();
1275#else
1276                slot->curl = curl_easy_duphandle(curl_default);
1277#endif
1278                curl_session_count++;
1279        }
1280
1281        active_requests++;
1282        slot->in_use = 1;
1283        slot->results = NULL;
1284        slot->finished = NULL;
1285        slot->callback_data = NULL;
1286        slot->callback_func = NULL;
1287        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1288        if (curl_save_cookies)
1289                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1290        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1291        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1292        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1293        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1294        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1295        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1296        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1297        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1298        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1299        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1300
1301        /*
1302         * Default following to off unless "ALWAYS" is configured; this gives
1303         * callers a sane starting point, and they can tweak for individual
1304         * HTTP_FOLLOW_* cases themselves.
1305         */
1306        if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1307                curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1308        else
1309                curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1310
1311#if LIBCURL_VERSION_NUM >= 0x070a08
1312        curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1313#endif
1314#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1315        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1316#endif
1317        if (http_auth.password || curl_empty_auth_enabled())
1318                init_curl_http_auth(slot->curl);
1319
1320        return slot;
1321}
1322
1323int start_active_slot(struct active_request_slot *slot)
1324{
1325#ifdef USE_CURL_MULTI
1326        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1327        int num_transfers;
1328
1329        if (curlm_result != CURLM_OK &&
1330            curlm_result != CURLM_CALL_MULTI_PERFORM) {
1331                warning("curl_multi_add_handle failed: %s",
1332                        curl_multi_strerror(curlm_result));
1333                active_requests--;
1334                slot->in_use = 0;
1335                return 0;
1336        }
1337
1338        /*
1339         * We know there must be something to do, since we just added
1340         * something.
1341         */
1342        curl_multi_perform(curlm, &num_transfers);
1343#endif
1344        return 1;
1345}
1346
1347#ifdef USE_CURL_MULTI
1348struct fill_chain {
1349        void *data;
1350        int (*fill)(void *);
1351        struct fill_chain *next;
1352};
1353
1354static struct fill_chain *fill_cfg;
1355
1356void add_fill_function(void *data, int (*fill)(void *))
1357{
1358        struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1359        struct fill_chain **linkp = &fill_cfg;
1360        new_fill->data = data;
1361        new_fill->fill = fill;
1362        new_fill->next = NULL;
1363        while (*linkp)
1364                linkp = &(*linkp)->next;
1365        *linkp = new_fill;
1366}
1367
1368void fill_active_slots(void)
1369{
1370        struct active_request_slot *slot = active_queue_head;
1371
1372        while (active_requests < max_requests) {
1373                struct fill_chain *fill;
1374                for (fill = fill_cfg; fill; fill = fill->next)
1375                        if (fill->fill(fill->data))
1376                                break;
1377
1378                if (!fill)
1379                        break;
1380        }
1381
1382        while (slot != NULL) {
1383                if (!slot->in_use && slot->curl != NULL
1384                        && curl_session_count > min_curl_sessions) {
1385                        curl_easy_cleanup(slot->curl);
1386                        slot->curl = NULL;
1387                        curl_session_count--;
1388                }
1389                slot = slot->next;
1390        }
1391}
1392
1393void step_active_slots(void)
1394{
1395        int num_transfers;
1396        CURLMcode curlm_result;
1397
1398        do {
1399                curlm_result = curl_multi_perform(curlm, &num_transfers);
1400        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1401        if (num_transfers < active_requests) {
1402                process_curl_messages();
1403                fill_active_slots();
1404        }
1405}
1406#endif
1407
1408void run_active_slot(struct active_request_slot *slot)
1409{
1410#ifdef USE_CURL_MULTI
1411        fd_set readfds;
1412        fd_set writefds;
1413        fd_set excfds;
1414        int max_fd;
1415        struct timeval select_timeout;
1416        int finished = 0;
1417
1418        slot->finished = &finished;
1419        while (!finished) {
1420                step_active_slots();
1421
1422                if (slot->in_use) {
1423#if LIBCURL_VERSION_NUM >= 0x070f04
1424                        long curl_timeout;
1425                        curl_multi_timeout(curlm, &curl_timeout);
1426                        if (curl_timeout == 0) {
1427                                continue;
1428                        } else if (curl_timeout == -1) {
1429                                select_timeout.tv_sec  = 0;
1430                                select_timeout.tv_usec = 50000;
1431                        } else {
1432                                select_timeout.tv_sec  =  curl_timeout / 1000;
1433                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1434                        }
1435#else
1436                        select_timeout.tv_sec  = 0;
1437                        select_timeout.tv_usec = 50000;
1438#endif
1439
1440                        max_fd = -1;
1441                        FD_ZERO(&readfds);
1442                        FD_ZERO(&writefds);
1443                        FD_ZERO(&excfds);
1444                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1445
1446                        /*
1447                         * It can happen that curl_multi_timeout returns a pathologically
1448                         * long timeout when curl_multi_fdset returns no file descriptors
1449                         * to read.  See commit message for more details.
1450                         */
1451                        if (max_fd < 0 &&
1452                            (select_timeout.tv_sec > 0 ||
1453                             select_timeout.tv_usec > 50000)) {
1454                                select_timeout.tv_sec  = 0;
1455                                select_timeout.tv_usec = 50000;
1456                        }
1457
1458                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1459                }
1460        }
1461#else
1462        while (slot->in_use) {
1463                slot->curl_result = curl_easy_perform(slot->curl);
1464                finish_active_slot(slot);
1465        }
1466#endif
1467}
1468
1469static void release_active_slot(struct active_request_slot *slot)
1470{
1471        closedown_active_slot(slot);
1472        if (slot->curl) {
1473                xmulti_remove_handle(slot);
1474                if (curl_session_count > min_curl_sessions) {
1475                        curl_easy_cleanup(slot->curl);
1476                        slot->curl = NULL;
1477                        curl_session_count--;
1478                }
1479        }
1480#ifdef USE_CURL_MULTI
1481        fill_active_slots();
1482#endif
1483}
1484
1485void finish_all_active_slots(void)
1486{
1487        struct active_request_slot *slot = active_queue_head;
1488
1489        while (slot != NULL)
1490                if (slot->in_use) {
1491                        run_active_slot(slot);
1492                        slot = active_queue_head;
1493                } else {
1494                        slot = slot->next;
1495                }
1496}
1497
1498/* Helpers for modifying and creating URLs */
1499static inline int needs_quote(int ch)
1500{
1501        if (((ch >= 'A') && (ch <= 'Z'))
1502                        || ((ch >= 'a') && (ch <= 'z'))
1503                        || ((ch >= '0') && (ch <= '9'))
1504                        || (ch == '/')
1505                        || (ch == '-')
1506                        || (ch == '.'))
1507                return 0;
1508        return 1;
1509}
1510
1511static char *quote_ref_url(const char *base, const char *ref)
1512{
1513        struct strbuf buf = STRBUF_INIT;
1514        const char *cp;
1515        int ch;
1516
1517        end_url_with_slash(&buf, base);
1518
1519        for (cp = ref; (ch = *cp) != 0; cp++)
1520                if (needs_quote(ch))
1521                        strbuf_addf(&buf, "%%%02x", ch);
1522                else
1523                        strbuf_addch(&buf, *cp);
1524
1525        return strbuf_detach(&buf, NULL);
1526}
1527
1528void append_remote_object_url(struct strbuf *buf, const char *url,
1529                              const char *hex,
1530                              int only_two_digit_prefix)
1531{
1532        end_url_with_slash(buf, url);
1533
1534        strbuf_addf(buf, "objects/%.*s/", 2, hex);
1535        if (!only_two_digit_prefix)
1536                strbuf_addstr(buf, hex + 2);
1537}
1538
1539char *get_remote_object_url(const char *url, const char *hex,
1540                            int only_two_digit_prefix)
1541{
1542        struct strbuf buf = STRBUF_INIT;
1543        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1544        return strbuf_detach(&buf, NULL);
1545}
1546
1547void normalize_curl_result(CURLcode *result, long http_code,
1548                           char *errorstr, size_t errorlen)
1549{
1550        /*
1551         * If we see a failing http code with CURLE_OK, we have turned off
1552         * FAILONERROR (to keep the server's custom error response), and should
1553         * translate the code into failure here.
1554         *
1555         * Likewise, if we see a redirect (30x code), that means we turned off
1556         * redirect-following, and we should treat the result as an error.
1557         */
1558        if (*result == CURLE_OK && http_code >= 300) {
1559                *result = CURLE_HTTP_RETURNED_ERROR;
1560                /*
1561                 * Normally curl will already have put the "reason phrase"
1562                 * from the server into curl_errorstr; unfortunately without
1563                 * FAILONERROR it is lost, so we can give only the numeric
1564                 * status code.
1565                 */
1566                xsnprintf(errorstr, errorlen,
1567                          "The requested URL returned error: %ld",
1568                          http_code);
1569        }
1570}
1571
1572static int handle_curl_result(struct slot_results *results)
1573{
1574        normalize_curl_result(&results->curl_result, results->http_code,
1575                              curl_errorstr, sizeof(curl_errorstr));
1576
1577        if (results->curl_result == CURLE_OK) {
1578                credential_approve(&http_auth);
1579                if (proxy_auth.password)
1580                        credential_approve(&proxy_auth);
1581                return HTTP_OK;
1582        } else if (missing_target(results))
1583                return HTTP_MISSING_TARGET;
1584        else if (results->http_code == 401) {
1585                if (http_auth.username && http_auth.password) {
1586                        credential_reject(&http_auth);
1587                        return HTTP_NOAUTH;
1588                } else {
1589#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1590                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1591                        if (results->auth_avail) {
1592                                http_auth_methods &= results->auth_avail;
1593                                http_auth_methods_restricted = 1;
1594                        }
1595#endif
1596                        return HTTP_REAUTH;
1597                }
1598        } else {
1599                if (results->http_connectcode == 407)
1600                        credential_reject(&proxy_auth);
1601#if LIBCURL_VERSION_NUM >= 0x070c00
1602                if (!curl_errorstr[0])
1603                        strlcpy(curl_errorstr,
1604                                curl_easy_strerror(results->curl_result),
1605                                sizeof(curl_errorstr));
1606#endif
1607                return HTTP_ERROR;
1608        }
1609}
1610
1611int run_one_slot(struct active_request_slot *slot,
1612                 struct slot_results *results)
1613{
1614        slot->results = results;
1615        if (!start_active_slot(slot)) {
1616                xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1617                          "failed to start HTTP request");
1618                return HTTP_START_FAILED;
1619        }
1620
1621        run_active_slot(slot);
1622        return handle_curl_result(results);
1623}
1624
1625struct curl_slist *http_copy_default_headers(void)
1626{
1627        struct curl_slist *headers = NULL, *h;
1628
1629        for (h = extra_http_headers; h; h = h->next)
1630                headers = curl_slist_append(headers, h->data);
1631
1632        return headers;
1633}
1634
1635static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1636{
1637        char *ptr;
1638        CURLcode ret;
1639
1640        strbuf_reset(buf);
1641        ret = curl_easy_getinfo(curl, info, &ptr);
1642        if (!ret && ptr)
1643                strbuf_addstr(buf, ptr);
1644        return ret;
1645}
1646
1647/*
1648 * Check for and extract a content-type parameter. "raw"
1649 * should be positioned at the start of the potential
1650 * parameter, with any whitespace already removed.
1651 *
1652 * "name" is the name of the parameter. The value is appended
1653 * to "out".
1654 */
1655static int extract_param(const char *raw, const char *name,
1656                         struct strbuf *out)
1657{
1658        size_t len = strlen(name);
1659
1660        if (strncasecmp(raw, name, len))
1661                return -1;
1662        raw += len;
1663
1664        if (*raw != '=')
1665                return -1;
1666        raw++;
1667
1668        while (*raw && !isspace(*raw) && *raw != ';')
1669                strbuf_addch(out, *raw++);
1670        return 0;
1671}
1672
1673/*
1674 * Extract a normalized version of the content type, with any
1675 * spaces suppressed, all letters lowercased, and no trailing ";"
1676 * or parameters.
1677 *
1678 * Note that we will silently remove even invalid whitespace. For
1679 * example, "text / plain" is specifically forbidden by RFC 2616,
1680 * but "text/plain" is the only reasonable output, and this keeps
1681 * our code simple.
1682 *
1683 * If the "charset" argument is not NULL, store the value of any
1684 * charset parameter there.
1685 *
1686 * Example:
1687 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1688 *   "text / plain" -> "text/plain"
1689 */
1690static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1691                                 struct strbuf *charset)
1692{
1693        const char *p;
1694
1695        strbuf_reset(type);
1696        strbuf_grow(type, raw->len);
1697        for (p = raw->buf; *p; p++) {
1698                if (isspace(*p))
1699                        continue;
1700                if (*p == ';') {
1701                        p++;
1702                        break;
1703                }
1704                strbuf_addch(type, tolower(*p));
1705        }
1706
1707        if (!charset)
1708                return;
1709
1710        strbuf_reset(charset);
1711        while (*p) {
1712                while (isspace(*p) || *p == ';')
1713                        p++;
1714                if (!extract_param(p, "charset", charset))
1715                        return;
1716                while (*p && !isspace(*p))
1717                        p++;
1718        }
1719
1720        if (!charset->len && starts_with(type->buf, "text/"))
1721                strbuf_addstr(charset, "ISO-8859-1");
1722}
1723
1724static void write_accept_language(struct strbuf *buf)
1725{
1726        /*
1727         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1728         * that, q-value will be smaller than 0.001, the minimum q-value the
1729         * HTTP specification allows. See
1730         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1731         */
1732        const int MAX_DECIMAL_PLACES = 3;
1733        const int MAX_LANGUAGE_TAGS = 1000;
1734        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1735        char **language_tags = NULL;
1736        int num_langs = 0;
1737        const char *s = get_preferred_languages();
1738        int i;
1739        struct strbuf tag = STRBUF_INIT;
1740
1741        /* Don't add Accept-Language header if no language is preferred. */
1742        if (!s)
1743                return;
1744
1745        /*
1746         * Split the colon-separated string of preferred languages into
1747         * language_tags array.
1748         */
1749        do {
1750                /* collect language tag */
1751                for (; *s && (isalnum(*s) || *s == '_'); s++)
1752                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1753
1754                /* skip .codeset, @modifier and any other unnecessary parts */
1755                while (*s && *s != ':')
1756                        s++;
1757
1758                if (tag.len) {
1759                        num_langs++;
1760                        REALLOC_ARRAY(language_tags, num_langs);
1761                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1762                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1763                                break;
1764                }
1765        } while (*s++);
1766
1767        /* write Accept-Language header into buf */
1768        if (num_langs) {
1769                int last_buf_len = 0;
1770                int max_q;
1771                int decimal_places;
1772                char q_format[32];
1773
1774                /* add '*' */
1775                REALLOC_ARRAY(language_tags, num_langs + 1);
1776                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1777
1778                /* compute decimal_places */
1779                for (max_q = 1, decimal_places = 0;
1780                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1781                     decimal_places++, max_q *= 10)
1782                        ;
1783
1784                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1785
1786                strbuf_addstr(buf, "Accept-Language: ");
1787
1788                for (i = 0; i < num_langs; i++) {
1789                        if (i > 0)
1790                                strbuf_addstr(buf, ", ");
1791
1792                        strbuf_addstr(buf, language_tags[i]);
1793
1794                        if (i > 0)
1795                                strbuf_addf(buf, q_format, max_q - i);
1796
1797                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1798                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1799                                break;
1800                        }
1801
1802                        last_buf_len = buf->len;
1803                }
1804        }
1805
1806        /* free language tags -- last one is a static '*' */
1807        for (i = 0; i < num_langs - 1; i++)
1808                free(language_tags[i]);
1809        free(language_tags);
1810}
1811
1812/*
1813 * Get an Accept-Language header which indicates user's preferred languages.
1814 *
1815 * Examples:
1816 *   LANGUAGE= -> ""
1817 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1818 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1819 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1820 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1821 *   LANGUAGE= LANG=C -> ""
1822 */
1823static const char *get_accept_language(void)
1824{
1825        if (!cached_accept_language) {
1826                struct strbuf buf = STRBUF_INIT;
1827                write_accept_language(&buf);
1828                if (buf.len > 0)
1829                        cached_accept_language = strbuf_detach(&buf, NULL);
1830        }
1831
1832        return cached_accept_language;
1833}
1834
1835static void http_opt_request_remainder(CURL *curl, off_t pos)
1836{
1837        char buf[128];
1838        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1839        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1840}
1841
1842/* http_request() targets */
1843#define HTTP_REQUEST_STRBUF     0
1844#define HTTP_REQUEST_FILE       1
1845
1846static int http_request(const char *url,
1847                        void *result, int target,
1848                        const struct http_get_options *options)
1849{
1850        struct active_request_slot *slot;
1851        struct slot_results results;
1852        struct curl_slist *headers = http_copy_default_headers();
1853        struct strbuf buf = STRBUF_INIT;
1854        const char *accept_language;
1855        int ret;
1856
1857        slot = get_active_slot();
1858        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1859
1860        if (result == NULL) {
1861                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1862        } else {
1863                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1864                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1865
1866                if (target == HTTP_REQUEST_FILE) {
1867                        off_t posn = ftello(result);
1868                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1869                                         fwrite);
1870                        if (posn > 0)
1871                                http_opt_request_remainder(slot->curl, posn);
1872                } else
1873                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1874                                         fwrite_buffer);
1875        }
1876
1877        accept_language = get_accept_language();
1878
1879        if (accept_language)
1880                headers = curl_slist_append(headers, accept_language);
1881
1882        strbuf_addstr(&buf, "Pragma:");
1883        if (options && options->no_cache)
1884                strbuf_addstr(&buf, " no-cache");
1885        if (options && options->initial_request &&
1886            http_follow_config == HTTP_FOLLOW_INITIAL)
1887                curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1888
1889        headers = curl_slist_append(headers, buf.buf);
1890
1891        /* Add additional headers here */
1892        if (options && options->extra_headers) {
1893                const struct string_list_item *item;
1894                for_each_string_list_item(item, options->extra_headers) {
1895                        headers = curl_slist_append(headers, item->string);
1896                }
1897        }
1898
1899        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1900        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1901        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1902        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1903
1904        ret = run_one_slot(slot, &results);
1905
1906        if (options && options->content_type) {
1907                struct strbuf raw = STRBUF_INIT;
1908                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1909                extract_content_type(&raw, options->content_type,
1910                                     options->charset);
1911                strbuf_release(&raw);
1912        }
1913
1914        if (options && options->effective_url)
1915                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1916                                options->effective_url);
1917
1918        curl_slist_free_all(headers);
1919        strbuf_release(&buf);
1920
1921        return ret;
1922}
1923
1924/*
1925 * Update the "base" url to a more appropriate value, as deduced by
1926 * redirects seen when requesting a URL starting with "url".
1927 *
1928 * The "asked" parameter is a URL that we asked curl to access, and must begin
1929 * with "base".
1930 *
1931 * The "got" parameter is the URL that curl reported to us as where we ended
1932 * up.
1933 *
1934 * Returns 1 if we updated the base url, 0 otherwise.
1935 *
1936 * Our basic strategy is to compare "base" and "asked" to find the bits
1937 * specific to our request. We then strip those bits off of "got" to yield the
1938 * new base. So for example, if our base is "http://example.com/foo.git",
1939 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1940 * with "https://other.example.com/foo.git/info/refs". We would want the
1941 * new URL to become "https://other.example.com/foo.git".
1942 *
1943 * Note that this assumes a sane redirect scheme. It's entirely possible
1944 * in the example above to end up at a URL that does not even end in
1945 * "info/refs".  In such a case we die. There's not much we can do, such a
1946 * scheme is unlikely to represent a real git repository, and failing to
1947 * rewrite the base opens options for malicious redirects to do funny things.
1948 */
1949static int update_url_from_redirect(struct strbuf *base,
1950                                    const char *asked,
1951                                    const struct strbuf *got)
1952{
1953        const char *tail;
1954        size_t new_len;
1955
1956        if (!strcmp(asked, got->buf))
1957                return 0;
1958
1959        if (!skip_prefix(asked, base->buf, &tail))
1960                BUG("update_url_from_redirect: %s is not a superset of %s",
1961                    asked, base->buf);
1962
1963        new_len = got->len;
1964        if (!strip_suffix_mem(got->buf, &new_len, tail))
1965                die(_("unable to update url base from redirection:\n"
1966                      "  asked for: %s\n"
1967                      "   redirect: %s"),
1968                    asked, got->buf);
1969
1970        strbuf_reset(base);
1971        strbuf_add(base, got->buf, new_len);
1972
1973        return 1;
1974}
1975
1976static int http_request_reauth(const char *url,
1977                               void *result, int target,
1978                               struct http_get_options *options)
1979{
1980        int ret = http_request(url, result, target, options);
1981
1982        if (ret != HTTP_OK && ret != HTTP_REAUTH)
1983                return ret;
1984
1985        if (options && options->effective_url && options->base_url) {
1986                if (update_url_from_redirect(options->base_url,
1987                                             url, options->effective_url)) {
1988                        credential_from_url(&http_auth, options->base_url->buf);
1989                        url = options->effective_url->buf;
1990                }
1991        }
1992
1993        if (ret != HTTP_REAUTH)
1994                return ret;
1995
1996        /*
1997         * The previous request may have put cruft into our output stream; we
1998         * should clear it out before making our next request.
1999         */
2000        switch (target) {
2001        case HTTP_REQUEST_STRBUF:
2002                strbuf_reset(result);
2003                break;
2004        case HTTP_REQUEST_FILE:
2005                if (fflush(result)) {
2006                        error_errno("unable to flush a file");
2007                        return HTTP_START_FAILED;
2008                }
2009                rewind(result);
2010                if (ftruncate(fileno(result), 0) < 0) {
2011                        error_errno("unable to truncate a file");
2012                        return HTTP_START_FAILED;
2013                }
2014                break;
2015        default:
2016                BUG("Unknown http_request target");
2017        }
2018
2019        credential_fill(&http_auth);
2020
2021        return http_request(url, result, target, options);
2022}
2023
2024int http_get_strbuf(const char *url,
2025                    struct strbuf *result,
2026                    struct http_get_options *options)
2027{
2028        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
2029}
2030
2031/*
2032 * Downloads a URL and stores the result in the given file.
2033 *
2034 * If a previous interrupted download is detected (i.e. a previous temporary
2035 * file is still around) the download is resumed.
2036 */
2037static int http_get_file(const char *url, const char *filename,
2038                         struct http_get_options *options)
2039{
2040        int ret;
2041        struct strbuf tmpfile = STRBUF_INIT;
2042        FILE *result;
2043
2044        strbuf_addf(&tmpfile, "%s.temp", filename);
2045        result = fopen(tmpfile.buf, "a");
2046        if (!result) {
2047                error("Unable to open local file %s", tmpfile.buf);
2048                ret = HTTP_ERROR;
2049                goto cleanup;
2050        }
2051
2052        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2053        fclose(result);
2054
2055        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2056                ret = HTTP_ERROR;
2057cleanup:
2058        strbuf_release(&tmpfile);
2059        return ret;
2060}
2061
2062int http_fetch_ref(const char *base, struct ref *ref)
2063{
2064        struct http_get_options options = {0};
2065        char *url;
2066        struct strbuf buffer = STRBUF_INIT;
2067        int ret = -1;
2068
2069        options.no_cache = 1;
2070
2071        url = quote_ref_url(base, ref->name);
2072        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2073                strbuf_rtrim(&buffer);
2074                if (buffer.len == the_hash_algo->hexsz)
2075                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
2076                else if (starts_with(buffer.buf, "ref: ")) {
2077                        ref->symref = xstrdup(buffer.buf + 5);
2078                        ret = 0;
2079                }
2080        }
2081
2082        strbuf_release(&buffer);
2083        free(url);
2084        return ret;
2085}
2086
2087/* Helpers for fetching packs */
2088static char *fetch_pack_index(unsigned char *hash, const char *base_url)
2089{
2090        char *url, *tmp;
2091        struct strbuf buf = STRBUF_INIT;
2092
2093        if (http_is_verbose)
2094                fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2095
2096        end_url_with_slash(&buf, base_url);
2097        strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2098        url = strbuf_detach(&buf, NULL);
2099
2100        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2101        tmp = strbuf_detach(&buf, NULL);
2102
2103        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2104                error("Unable to get pack index %s", url);
2105                FREE_AND_NULL(tmp);
2106        }
2107
2108        free(url);
2109        return tmp;
2110}
2111
2112static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2113        unsigned char *sha1, const char *base_url)
2114{
2115        struct packed_git *new_pack;
2116        char *tmp_idx = NULL;
2117        int ret;
2118
2119        if (has_pack_index(sha1)) {
2120                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2121                if (!new_pack)
2122                        return -1; /* parse_pack_index() already issued error message */
2123                goto add_pack;
2124        }
2125
2126        tmp_idx = fetch_pack_index(sha1, base_url);
2127        if (!tmp_idx)
2128                return -1;
2129
2130        new_pack = parse_pack_index(sha1, tmp_idx);
2131        if (!new_pack) {
2132                unlink(tmp_idx);
2133                free(tmp_idx);
2134
2135                return -1; /* parse_pack_index() already issued error message */
2136        }
2137
2138        ret = verify_pack_index(new_pack);
2139        if (!ret) {
2140                close_pack_index(new_pack);
2141                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2142        }
2143        free(tmp_idx);
2144        if (ret)
2145                return -1;
2146
2147add_pack:
2148        new_pack->next = *packs_head;
2149        *packs_head = new_pack;
2150        return 0;
2151}
2152
2153int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2154{
2155        struct http_get_options options = {0};
2156        int ret = 0;
2157        char *url;
2158        const char *data;
2159        struct strbuf buf = STRBUF_INIT;
2160        struct object_id oid;
2161
2162        end_url_with_slash(&buf, base_url);
2163        strbuf_addstr(&buf, "objects/info/packs");
2164        url = strbuf_detach(&buf, NULL);
2165
2166        options.no_cache = 1;
2167        ret = http_get_strbuf(url, &buf, &options);
2168        if (ret != HTTP_OK)
2169                goto cleanup;
2170
2171        data = buf.buf;
2172        while (*data) {
2173                if (skip_prefix(data, "P pack-", &data) &&
2174                    !parse_oid_hex(data, &oid, &data) &&
2175                    skip_prefix(data, ".pack", &data) &&
2176                    (*data == '\n' || *data == '\0')) {
2177                        fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2178                } else {
2179                        data = strchrnul(data, '\n');
2180                }
2181                if (*data)
2182                        data++; /* skip past newline */
2183        }
2184
2185cleanup:
2186        free(url);
2187        return ret;
2188}
2189
2190void release_http_pack_request(struct http_pack_request *preq)
2191{
2192        if (preq->packfile != NULL) {
2193                fclose(preq->packfile);
2194                preq->packfile = NULL;
2195        }
2196        preq->slot = NULL;
2197        strbuf_release(&preq->tmpfile);
2198        free(preq->url);
2199        free(preq);
2200}
2201
2202int finish_http_pack_request(struct http_pack_request *preq)
2203{
2204        struct packed_git **lst;
2205        struct packed_git *p = preq->target;
2206        char *tmp_idx;
2207        size_t len;
2208        struct child_process ip = CHILD_PROCESS_INIT;
2209
2210        close_pack_index(p);
2211
2212        fclose(preq->packfile);
2213        preq->packfile = NULL;
2214
2215        lst = preq->lst;
2216        while (*lst != p)
2217                lst = &((*lst)->next);
2218        *lst = (*lst)->next;
2219
2220        if (!strip_suffix(preq->tmpfile.buf, ".pack.temp", &len))
2221                BUG("pack tmpfile does not end in .pack.temp?");
2222        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile.buf);
2223
2224        argv_array_push(&ip.args, "index-pack");
2225        argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2226        argv_array_push(&ip.args, preq->tmpfile.buf);
2227        ip.git_cmd = 1;
2228        ip.no_stdin = 1;
2229        ip.no_stdout = 1;
2230
2231        if (run_command(&ip)) {
2232                unlink(preq->tmpfile.buf);
2233                unlink(tmp_idx);
2234                free(tmp_idx);
2235                return -1;
2236        }
2237
2238        unlink(sha1_pack_index_name(p->hash));
2239
2240        if (finalize_object_file(preq->tmpfile.buf, sha1_pack_name(p->hash))
2241         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->hash))) {
2242                free(tmp_idx);
2243                return -1;
2244        }
2245
2246        install_packed_git(the_repository, p);
2247        free(tmp_idx);
2248        return 0;
2249}
2250
2251struct http_pack_request *new_http_pack_request(
2252        struct packed_git *target, const char *base_url)
2253{
2254        off_t prev_posn = 0;
2255        struct strbuf buf = STRBUF_INIT;
2256        struct http_pack_request *preq;
2257
2258        preq = xcalloc(1, sizeof(*preq));
2259        strbuf_init(&preq->tmpfile, 0);
2260        preq->target = target;
2261
2262        end_url_with_slash(&buf, base_url);
2263        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2264                hash_to_hex(target->hash));
2265        preq->url = strbuf_detach(&buf, NULL);
2266
2267        strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(target->hash));
2268        preq->packfile = fopen(preq->tmpfile.buf, "a");
2269        if (!preq->packfile) {
2270                error("Unable to open local file %s for pack",
2271                      preq->tmpfile.buf);
2272                goto abort;
2273        }
2274
2275        preq->slot = get_active_slot();
2276        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2277        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2278        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2279        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2280                no_pragma_header);
2281
2282        /*
2283         * If there is data present from a previous transfer attempt,
2284         * resume where it left off
2285         */
2286        prev_posn = ftello(preq->packfile);
2287        if (prev_posn>0) {
2288                if (http_is_verbose)
2289                        fprintf(stderr,
2290                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2291                                hash_to_hex(target->hash),
2292                                (uintmax_t)prev_posn);
2293                http_opt_request_remainder(preq->slot->curl, prev_posn);
2294        }
2295
2296        return preq;
2297
2298abort:
2299        strbuf_release(&preq->tmpfile);
2300        free(preq->url);
2301        free(preq);
2302        return NULL;
2303}
2304
2305/* Helpers for fetching objects (loose) */
2306static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2307                               void *data)
2308{
2309        unsigned char expn[4096];
2310        size_t size = eltsize * nmemb;
2311        int posn = 0;
2312        struct http_object_request *freq = data;
2313        struct active_request_slot *slot = freq->slot;
2314
2315        if (slot) {
2316                CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2317                                                &slot->http_code);
2318                if (c != CURLE_OK)
2319                        BUG("curl_easy_getinfo for HTTP code failed: %s",
2320                                curl_easy_strerror(c));
2321                if (slot->http_code >= 300)
2322                        return nmemb;
2323        }
2324
2325        do {
2326                ssize_t retval = xwrite(freq->localfile,
2327                                        (char *) ptr + posn, size - posn);
2328                if (retval < 0)
2329                        return posn / eltsize;
2330                posn += retval;
2331        } while (posn < size);
2332
2333        freq->stream.avail_in = size;
2334        freq->stream.next_in = (void *)ptr;
2335        do {
2336                freq->stream.next_out = expn;
2337                freq->stream.avail_out = sizeof(expn);
2338                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2339                the_hash_algo->update_fn(&freq->c, expn,
2340                                         sizeof(expn) - freq->stream.avail_out);
2341        } while (freq->stream.avail_in && freq->zret == Z_OK);
2342        return nmemb;
2343}
2344
2345struct http_object_request *new_http_object_request(const char *base_url,
2346                                                    const struct object_id *oid)
2347{
2348        char *hex = oid_to_hex(oid);
2349        struct strbuf filename = STRBUF_INIT;
2350        struct strbuf prevfile = STRBUF_INIT;
2351        int prevlocal;
2352        char prev_buf[PREV_BUF_SIZE];
2353        ssize_t prev_read = 0;
2354        off_t prev_posn = 0;
2355        struct http_object_request *freq;
2356
2357        freq = xcalloc(1, sizeof(*freq));
2358        strbuf_init(&freq->tmpfile, 0);
2359        oidcpy(&freq->oid, oid);
2360        freq->localfile = -1;
2361
2362        loose_object_path(the_repository, &filename, oid);
2363        strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2364
2365        strbuf_addf(&prevfile, "%s.prev", filename.buf);
2366        unlink_or_warn(prevfile.buf);
2367        rename(freq->tmpfile.buf, prevfile.buf);
2368        unlink_or_warn(freq->tmpfile.buf);
2369        strbuf_release(&filename);
2370
2371        if (freq->localfile != -1)
2372                error("fd leakage in start: %d", freq->localfile);
2373        freq->localfile = open(freq->tmpfile.buf,
2374                               O_WRONLY | O_CREAT | O_EXCL, 0666);
2375        /*
2376         * This could have failed due to the "lazy directory creation";
2377         * try to mkdir the last path component.
2378         */
2379        if (freq->localfile < 0 && errno == ENOENT) {
2380                char *dir = strrchr(freq->tmpfile.buf, '/');
2381                if (dir) {
2382                        *dir = 0;
2383                        mkdir(freq->tmpfile.buf, 0777);
2384                        *dir = '/';
2385                }
2386                freq->localfile = open(freq->tmpfile.buf,
2387                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
2388        }
2389
2390        if (freq->localfile < 0) {
2391                error_errno("Couldn't create temporary file %s",
2392                            freq->tmpfile.buf);
2393                goto abort;
2394        }
2395
2396        git_inflate_init(&freq->stream);
2397
2398        the_hash_algo->init_fn(&freq->c);
2399
2400        freq->url = get_remote_object_url(base_url, hex, 0);
2401
2402        /*
2403         * If a previous temp file is present, process what was already
2404         * fetched.
2405         */
2406        prevlocal = open(prevfile.buf, O_RDONLY);
2407        if (prevlocal != -1) {
2408                do {
2409                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2410                        if (prev_read>0) {
2411                                if (fwrite_sha1_file(prev_buf,
2412                                                     1,
2413                                                     prev_read,
2414                                                     freq) == prev_read) {
2415                                        prev_posn += prev_read;
2416                                } else {
2417                                        prev_read = -1;
2418                                }
2419                        }
2420                } while (prev_read > 0);
2421                close(prevlocal);
2422        }
2423        unlink_or_warn(prevfile.buf);
2424        strbuf_release(&prevfile);
2425
2426        /*
2427         * Reset inflate/SHA1 if there was an error reading the previous temp
2428         * file; also rewind to the beginning of the local file.
2429         */
2430        if (prev_read == -1) {
2431                memset(&freq->stream, 0, sizeof(freq->stream));
2432                git_inflate_init(&freq->stream);
2433                the_hash_algo->init_fn(&freq->c);
2434                if (prev_posn>0) {
2435                        prev_posn = 0;
2436                        lseek(freq->localfile, 0, SEEK_SET);
2437                        if (ftruncate(freq->localfile, 0) < 0) {
2438                                error_errno("Couldn't truncate temporary file %s",
2439                                            freq->tmpfile.buf);
2440                                goto abort;
2441                        }
2442                }
2443        }
2444
2445        freq->slot = get_active_slot();
2446
2447        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2448        curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2449        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2450        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2451        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2452        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2453
2454        /*
2455         * If we have successfully processed data from a previous fetch
2456         * attempt, only fetch the data we don't already have.
2457         */
2458        if (prev_posn>0) {
2459                if (http_is_verbose)
2460                        fprintf(stderr,
2461                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2462                                hex, (uintmax_t)prev_posn);
2463                http_opt_request_remainder(freq->slot->curl, prev_posn);
2464        }
2465
2466        return freq;
2467
2468abort:
2469        strbuf_release(&prevfile);
2470        free(freq->url);
2471        free(freq);
2472        return NULL;
2473}
2474
2475void process_http_object_request(struct http_object_request *freq)
2476{
2477        if (freq->slot == NULL)
2478                return;
2479        freq->curl_result = freq->slot->curl_result;
2480        freq->http_code = freq->slot->http_code;
2481        freq->slot = NULL;
2482}
2483
2484int finish_http_object_request(struct http_object_request *freq)
2485{
2486        struct stat st;
2487        struct strbuf filename = STRBUF_INIT;
2488
2489        close(freq->localfile);
2490        freq->localfile = -1;
2491
2492        process_http_object_request(freq);
2493
2494        if (freq->http_code == 416) {
2495                warning("requested range invalid; we may already have all the data.");
2496        } else if (freq->curl_result != CURLE_OK) {
2497                if (stat(freq->tmpfile.buf, &st) == 0)
2498                        if (st.st_size == 0)
2499                                unlink_or_warn(freq->tmpfile.buf);
2500                return -1;
2501        }
2502
2503        git_inflate_end(&freq->stream);
2504        the_hash_algo->final_fn(freq->real_oid.hash, &freq->c);
2505        if (freq->zret != Z_STREAM_END) {
2506                unlink_or_warn(freq->tmpfile.buf);
2507                return -1;
2508        }
2509        if (!oideq(&freq->oid, &freq->real_oid)) {
2510                unlink_or_warn(freq->tmpfile.buf);
2511                return -1;
2512        }
2513        loose_object_path(the_repository, &filename, &freq->oid);
2514        freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2515        strbuf_release(&filename);
2516
2517        return freq->rename;
2518}
2519
2520void abort_http_object_request(struct http_object_request *freq)
2521{
2522        unlink_or_warn(freq->tmpfile.buf);
2523
2524        release_http_object_request(freq);
2525}
2526
2527void release_http_object_request(struct http_object_request *freq)
2528{
2529        if (freq->localfile != -1) {
2530                close(freq->localfile);
2531                freq->localfile = -1;
2532        }
2533        FREE_AND_NULL(freq->url);
2534        if (freq->slot != NULL) {
2535                freq->slot->callback_func = NULL;
2536                freq->slot->callback_data = NULL;
2537                release_active_slot(freq->slot);
2538                freq->slot = NULL;
2539        }
2540        strbuf_release(&freq->tmpfile);
2541}