http.con commit Merge branch 'bw/push-options-recursively-to-submodules' (a49794d)
   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
  15static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
  16#if LIBCURL_VERSION_NUM >= 0x070a08
  17long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  18#else
  19long int git_curl_ipresolve;
  20#endif
  21int active_requests;
  22int http_is_verbose;
  23ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  24
  25#if LIBCURL_VERSION_NUM >= 0x070a06
  26#define LIBCURL_CAN_HANDLE_AUTH_ANY
  27#endif
  28
  29static int min_curl_sessions = 1;
  30static int curl_session_count;
  31#ifdef USE_CURL_MULTI
  32static int max_requests = -1;
  33static CURLM *curlm;
  34#endif
  35#ifndef NO_CURL_EASY_DUPHANDLE
  36static CURL *curl_default;
  37#endif
  38
  39#define PREV_BUF_SIZE 4096
  40
  41char curl_errorstr[CURL_ERROR_SIZE];
  42
  43static int curl_ssl_verify = -1;
  44static int curl_ssl_try;
  45static const char *ssl_cert;
  46static const char *ssl_cipherlist;
  47static const char *ssl_version;
  48static struct {
  49        const char *name;
  50        long ssl_version;
  51} sslversions[] = {
  52        { "sslv2", CURL_SSLVERSION_SSLv2 },
  53        { "sslv3", CURL_SSLVERSION_SSLv3 },
  54        { "tlsv1", CURL_SSLVERSION_TLSv1 },
  55#if LIBCURL_VERSION_NUM >= 0x072200
  56        { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  57        { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  58        { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  59#endif
  60};
  61#if LIBCURL_VERSION_NUM >= 0x070903
  62static const char *ssl_key;
  63#endif
  64#if LIBCURL_VERSION_NUM >= 0x070908
  65static const char *ssl_capath;
  66#endif
  67#if LIBCURL_VERSION_NUM >= 0x072c00
  68static const char *ssl_pinnedkey;
  69#endif
  70static const char *ssl_cainfo;
  71static long curl_low_speed_limit = -1;
  72static long curl_low_speed_time = -1;
  73static int curl_ftp_no_epsv;
  74static const char *curl_http_proxy;
  75static const char *curl_no_proxy;
  76static const char *http_proxy_authmethod;
  77static struct {
  78        const char *name;
  79        long curlauth_param;
  80} proxy_authmethods[] = {
  81        { "basic", CURLAUTH_BASIC },
  82        { "digest", CURLAUTH_DIGEST },
  83        { "negotiate", CURLAUTH_GSSNEGOTIATE },
  84        { "ntlm", CURLAUTH_NTLM },
  85#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  86        { "anyauth", CURLAUTH_ANY },
  87#endif
  88        /*
  89         * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  90         * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  91         * here, too
  92         */
  93};
  94#if LIBCURL_VERSION_NUM >= 0x071600
  95static const char *curl_deleg;
  96static struct {
  97        const char *name;
  98        long curl_deleg_param;
  99} curl_deleg_levels[] = {
 100        { "none", CURLGSSAPI_DELEGATION_NONE },
 101        { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
 102        { "always", CURLGSSAPI_DELEGATION_FLAG },
 103};
 104#endif
 105
 106static struct credential proxy_auth = CREDENTIAL_INIT;
 107static const char *curl_proxyuserpwd;
 108static const char *curl_cookie_file;
 109static int curl_save_cookies;
 110struct credential http_auth = CREDENTIAL_INIT;
 111static int http_proactive_auth;
 112static const char *user_agent;
 113static int curl_empty_auth = -1;
 114
 115enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
 116
 117#if LIBCURL_VERSION_NUM >= 0x071700
 118/* Use CURLOPT_KEYPASSWD as is */
 119#elif LIBCURL_VERSION_NUM >= 0x070903
 120#define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 121#else
 122#define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 123#endif
 124
 125static struct credential cert_auth = CREDENTIAL_INIT;
 126static int ssl_cert_password_required;
 127#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 128static unsigned long http_auth_methods = CURLAUTH_ANY;
 129static int http_auth_methods_restricted;
 130/* Modes for which empty_auth cannot actually help us. */
 131static unsigned long empty_auth_useless =
 132        CURLAUTH_BASIC
 133#ifdef CURLAUTH_DIGEST_IE
 134        | CURLAUTH_DIGEST_IE
 135#endif
 136        | CURLAUTH_DIGEST;
 137#endif
 138
 139static struct curl_slist *pragma_header;
 140static struct curl_slist *no_pragma_header;
 141static struct curl_slist *extra_http_headers;
 142
 143static struct active_request_slot *active_queue_head;
 144
 145static char *cached_accept_language;
 146
 147size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 148{
 149        size_t size = eltsize * nmemb;
 150        struct buffer *buffer = buffer_;
 151
 152        if (size > buffer->buf.len - buffer->posn)
 153                size = buffer->buf.len - buffer->posn;
 154        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 155        buffer->posn += size;
 156
 157        return size;
 158}
 159
 160#ifndef NO_CURL_IOCTL
 161curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 162{
 163        struct buffer *buffer = clientp;
 164
 165        switch (cmd) {
 166        case CURLIOCMD_NOP:
 167                return CURLIOE_OK;
 168
 169        case CURLIOCMD_RESTARTREAD:
 170                buffer->posn = 0;
 171                return CURLIOE_OK;
 172
 173        default:
 174                return CURLIOE_UNKNOWNCMD;
 175        }
 176}
 177#endif
 178
 179size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 180{
 181        size_t size = eltsize * nmemb;
 182        struct strbuf *buffer = buffer_;
 183
 184        strbuf_add(buffer, ptr, size);
 185        return size;
 186}
 187
 188size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 189{
 190        return eltsize * nmemb;
 191}
 192
 193static void closedown_active_slot(struct active_request_slot *slot)
 194{
 195        active_requests--;
 196        slot->in_use = 0;
 197}
 198
 199static void finish_active_slot(struct active_request_slot *slot)
 200{
 201        closedown_active_slot(slot);
 202        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 203
 204        if (slot->finished != NULL)
 205                (*slot->finished) = 1;
 206
 207        /* Store slot results so they can be read after the slot is reused */
 208        if (slot->results != NULL) {
 209                slot->results->curl_result = slot->curl_result;
 210                slot->results->http_code = slot->http_code;
 211#if LIBCURL_VERSION_NUM >= 0x070a08
 212                curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 213                                  &slot->results->auth_avail);
 214#else
 215                slot->results->auth_avail = 0;
 216#endif
 217
 218                curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 219                        &slot->results->http_connectcode);
 220        }
 221
 222        /* Run callback if appropriate */
 223        if (slot->callback_func != NULL)
 224                slot->callback_func(slot->callback_data);
 225}
 226
 227static void xmulti_remove_handle(struct active_request_slot *slot)
 228{
 229#ifdef USE_CURL_MULTI
 230        curl_multi_remove_handle(curlm, slot->curl);
 231#endif
 232}
 233
 234#ifdef USE_CURL_MULTI
 235static void process_curl_messages(void)
 236{
 237        int num_messages;
 238        struct active_request_slot *slot;
 239        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 240
 241        while (curl_message != NULL) {
 242                if (curl_message->msg == CURLMSG_DONE) {
 243                        int curl_result = curl_message->data.result;
 244                        slot = active_queue_head;
 245                        while (slot != NULL &&
 246                               slot->curl != curl_message->easy_handle)
 247                                slot = slot->next;
 248                        if (slot != NULL) {
 249                                xmulti_remove_handle(slot);
 250                                slot->curl_result = curl_result;
 251                                finish_active_slot(slot);
 252                        } else {
 253                                fprintf(stderr, "Received DONE message for unknown request!\n");
 254                        }
 255                } else {
 256                        fprintf(stderr, "Unknown CURL message received: %d\n",
 257                                (int)curl_message->msg);
 258                }
 259                curl_message = curl_multi_info_read(curlm, &num_messages);
 260        }
 261}
 262#endif
 263
 264static int http_options(const char *var, const char *value, void *cb)
 265{
 266        if (!strcmp("http.sslverify", var)) {
 267                curl_ssl_verify = git_config_bool(var, value);
 268                return 0;
 269        }
 270        if (!strcmp("http.sslcipherlist", var))
 271                return git_config_string(&ssl_cipherlist, var, value);
 272        if (!strcmp("http.sslversion", var))
 273                return git_config_string(&ssl_version, var, value);
 274        if (!strcmp("http.sslcert", var))
 275                return git_config_pathname(&ssl_cert, var, value);
 276#if LIBCURL_VERSION_NUM >= 0x070903
 277        if (!strcmp("http.sslkey", var))
 278                return git_config_pathname(&ssl_key, var, value);
 279#endif
 280#if LIBCURL_VERSION_NUM >= 0x070908
 281        if (!strcmp("http.sslcapath", var))
 282                return git_config_pathname(&ssl_capath, var, value);
 283#endif
 284        if (!strcmp("http.sslcainfo", var))
 285                return git_config_pathname(&ssl_cainfo, var, value);
 286        if (!strcmp("http.sslcertpasswordprotected", var)) {
 287                ssl_cert_password_required = git_config_bool(var, value);
 288                return 0;
 289        }
 290        if (!strcmp("http.ssltry", var)) {
 291                curl_ssl_try = git_config_bool(var, value);
 292                return 0;
 293        }
 294        if (!strcmp("http.minsessions", var)) {
 295                min_curl_sessions = git_config_int(var, value);
 296#ifndef USE_CURL_MULTI
 297                if (min_curl_sessions > 1)
 298                        min_curl_sessions = 1;
 299#endif
 300                return 0;
 301        }
 302#ifdef USE_CURL_MULTI
 303        if (!strcmp("http.maxrequests", var)) {
 304                max_requests = git_config_int(var, value);
 305                return 0;
 306        }
 307#endif
 308        if (!strcmp("http.lowspeedlimit", var)) {
 309                curl_low_speed_limit = (long)git_config_int(var, value);
 310                return 0;
 311        }
 312        if (!strcmp("http.lowspeedtime", var)) {
 313                curl_low_speed_time = (long)git_config_int(var, value);
 314                return 0;
 315        }
 316
 317        if (!strcmp("http.noepsv", var)) {
 318                curl_ftp_no_epsv = git_config_bool(var, value);
 319                return 0;
 320        }
 321        if (!strcmp("http.proxy", var))
 322                return git_config_string(&curl_http_proxy, var, value);
 323
 324        if (!strcmp("http.proxyauthmethod", var))
 325                return git_config_string(&http_proxy_authmethod, var, value);
 326
 327        if (!strcmp("http.cookiefile", var))
 328                return git_config_pathname(&curl_cookie_file, var, value);
 329        if (!strcmp("http.savecookies", var)) {
 330                curl_save_cookies = git_config_bool(var, value);
 331                return 0;
 332        }
 333
 334        if (!strcmp("http.postbuffer", var)) {
 335                http_post_buffer = git_config_ssize_t(var, value);
 336                if (http_post_buffer < 0)
 337                        warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
 338                if (http_post_buffer < LARGE_PACKET_MAX)
 339                        http_post_buffer = LARGE_PACKET_MAX;
 340                return 0;
 341        }
 342
 343        if (!strcmp("http.useragent", var))
 344                return git_config_string(&user_agent, var, value);
 345
 346        if (!strcmp("http.emptyauth", var)) {
 347                if (value && !strcmp("auto", value))
 348                        curl_empty_auth = -1;
 349                else
 350                        curl_empty_auth = git_config_bool(var, value);
 351                return 0;
 352        }
 353
 354        if (!strcmp("http.delegation", var)) {
 355#if LIBCURL_VERSION_NUM >= 0x071600
 356                return git_config_string(&curl_deleg, var, value);
 357#else
 358                warning(_("Delegation control is not supported with cURL < 7.22.0"));
 359                return 0;
 360#endif
 361        }
 362
 363        if (!strcmp("http.pinnedpubkey", var)) {
 364#if LIBCURL_VERSION_NUM >= 0x072c00
 365                return git_config_pathname(&ssl_pinnedkey, var, value);
 366#else
 367                warning(_("Public key pinning not supported with cURL < 7.44.0"));
 368                return 0;
 369#endif
 370        }
 371
 372        if (!strcmp("http.extraheader", var)) {
 373                if (!value) {
 374                        return config_error_nonbool(var);
 375                } else if (!*value) {
 376                        curl_slist_free_all(extra_http_headers);
 377                        extra_http_headers = NULL;
 378                } else {
 379                        extra_http_headers =
 380                                curl_slist_append(extra_http_headers, value);
 381                }
 382                return 0;
 383        }
 384
 385        if (!strcmp("http.followredirects", var)) {
 386                if (value && !strcmp(value, "initial"))
 387                        http_follow_config = HTTP_FOLLOW_INITIAL;
 388                else if (git_config_bool(var, value))
 389                        http_follow_config = HTTP_FOLLOW_ALWAYS;
 390                else
 391                        http_follow_config = HTTP_FOLLOW_NONE;
 392                return 0;
 393        }
 394
 395        /* Fall back on the default ones */
 396        return git_default_config(var, value, cb);
 397}
 398
 399static int curl_empty_auth_enabled(void)
 400{
 401        if (curl_empty_auth >= 0)
 402                return curl_empty_auth;
 403
 404#ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
 405        /*
 406         * Our libcurl is too old to do AUTH_ANY in the first place;
 407         * just default to turning the feature off.
 408         */
 409#else
 410        /*
 411         * In the automatic case, kick in the empty-auth
 412         * hack as long as we would potentially try some
 413         * method more exotic than "Basic" or "Digest".
 414         *
 415         * But only do this when this is our second or
 416         * subsequent request, as by then we know what
 417         * methods are available.
 418         */
 419        if (http_auth_methods_restricted &&
 420            (http_auth_methods & ~empty_auth_useless))
 421                return 1;
 422#endif
 423        return 0;
 424}
 425
 426static void init_curl_http_auth(CURL *result)
 427{
 428        if (!http_auth.username || !*http_auth.username) {
 429                if (curl_empty_auth_enabled())
 430                        curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 431                return;
 432        }
 433
 434        credential_fill(&http_auth);
 435
 436#if LIBCURL_VERSION_NUM >= 0x071301
 437        curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 438        curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 439#else
 440        {
 441                static struct strbuf up = STRBUF_INIT;
 442                /*
 443                 * Note that we assume we only ever have a single set of
 444                 * credentials in a given program run, so we do not have
 445                 * to worry about updating this buffer, only setting its
 446                 * initial value.
 447                 */
 448                if (!up.len)
 449                        strbuf_addf(&up, "%s:%s",
 450                                http_auth.username, http_auth.password);
 451                curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 452        }
 453#endif
 454}
 455
 456/* *var must be free-able */
 457static void var_override(const char **var, char *value)
 458{
 459        if (value) {
 460                free((void *)*var);
 461                *var = xstrdup(value);
 462        }
 463}
 464
 465static void set_proxyauth_name_password(CURL *result)
 466{
 467#if LIBCURL_VERSION_NUM >= 0x071301
 468                curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 469                        proxy_auth.username);
 470                curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 471                        proxy_auth.password);
 472#else
 473                struct strbuf s = STRBUF_INIT;
 474
 475                strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 476                strbuf_addch(&s, ':');
 477                strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 478                curl_proxyuserpwd = strbuf_detach(&s, NULL);
 479                curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 480#endif
 481}
 482
 483static void init_curl_proxy_auth(CURL *result)
 484{
 485        if (proxy_auth.username) {
 486                if (!proxy_auth.password)
 487                        credential_fill(&proxy_auth);
 488                set_proxyauth_name_password(result);
 489        }
 490
 491        var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 492
 493#if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 494        if (http_proxy_authmethod) {
 495                int i;
 496                for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 497                        if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 498                                curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 499                                                proxy_authmethods[i].curlauth_param);
 500                                break;
 501                        }
 502                }
 503                if (i == ARRAY_SIZE(proxy_authmethods)) {
 504                        warning("unsupported proxy authentication method %s: using anyauth",
 505                                        http_proxy_authmethod);
 506                        curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 507                }
 508        }
 509        else
 510                curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 511#endif
 512}
 513
 514static int has_cert_password(void)
 515{
 516        if (ssl_cert == NULL || ssl_cert_password_required != 1)
 517                return 0;
 518        if (!cert_auth.password) {
 519                cert_auth.protocol = xstrdup("cert");
 520                cert_auth.username = xstrdup("");
 521                cert_auth.path = xstrdup(ssl_cert);
 522                credential_fill(&cert_auth);
 523        }
 524        return 1;
 525}
 526
 527#if LIBCURL_VERSION_NUM >= 0x071900
 528static void set_curl_keepalive(CURL *c)
 529{
 530        curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 531}
 532
 533#elif LIBCURL_VERSION_NUM >= 0x071000
 534static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 535{
 536        int ka = 1;
 537        int rc;
 538        socklen_t len = (socklen_t)sizeof(ka);
 539
 540        if (type != CURLSOCKTYPE_IPCXN)
 541                return 0;
 542
 543        rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 544        if (rc < 0)
 545                warning_errno("unable to set SO_KEEPALIVE on socket");
 546
 547        return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 548}
 549
 550static void set_curl_keepalive(CURL *c)
 551{
 552        curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 553}
 554
 555#else
 556static void set_curl_keepalive(CURL *c)
 557{
 558        /* not supported on older curl versions */
 559}
 560#endif
 561
 562static void redact_sensitive_header(struct strbuf *header)
 563{
 564        const char *sensitive_header;
 565
 566        if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 567            skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 568                /* The first token is the type, which is OK to log */
 569                while (isspace(*sensitive_header))
 570                        sensitive_header++;
 571                while (*sensitive_header && !isspace(*sensitive_header))
 572                        sensitive_header++;
 573                /* Everything else is opaque and possibly sensitive */
 574                strbuf_setlen(header,  sensitive_header - header->buf);
 575                strbuf_addstr(header, " <redacted>");
 576        }
 577}
 578
 579static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 580{
 581        struct strbuf out = STRBUF_INIT;
 582        struct strbuf **headers, **header;
 583
 584        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 585                text, (long)size, (long)size);
 586        trace_strbuf(&trace_curl, &out);
 587        strbuf_reset(&out);
 588        strbuf_add(&out, ptr, size);
 589        headers = strbuf_split_max(&out, '\n', 0);
 590
 591        for (header = headers; *header; header++) {
 592                if (hide_sensitive_header)
 593                        redact_sensitive_header(*header);
 594                strbuf_insert((*header), 0, text, strlen(text));
 595                strbuf_insert((*header), strlen(text), ": ", 2);
 596                strbuf_rtrim((*header));
 597                strbuf_addch((*header), '\n');
 598                trace_strbuf(&trace_curl, (*header));
 599        }
 600        strbuf_list_free(headers);
 601        strbuf_release(&out);
 602}
 603
 604static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 605{
 606        size_t i;
 607        struct strbuf out = STRBUF_INIT;
 608        unsigned int width = 60;
 609
 610        strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 611                text, (long)size, (long)size);
 612        trace_strbuf(&trace_curl, &out);
 613
 614        for (i = 0; i < size; i += width) {
 615                size_t w;
 616
 617                strbuf_reset(&out);
 618                strbuf_addf(&out, "%s: ", text);
 619                for (w = 0; (w < width) && (i + w < size); w++) {
 620                        unsigned char ch = ptr[i + w];
 621
 622                        strbuf_addch(&out,
 623                                       (ch >= 0x20) && (ch < 0x80)
 624                                       ? ch : '.');
 625                }
 626                strbuf_addch(&out, '\n');
 627                trace_strbuf(&trace_curl, &out);
 628        }
 629        strbuf_release(&out);
 630}
 631
 632static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 633{
 634        const char *text;
 635        enum { NO_FILTER = 0, DO_FILTER = 1 };
 636
 637        switch (type) {
 638        case CURLINFO_TEXT:
 639                trace_printf_key(&trace_curl, "== Info: %s", data);
 640        default:                /* we ignore unknown types by default */
 641                return 0;
 642
 643        case CURLINFO_HEADER_OUT:
 644                text = "=> Send header";
 645                curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 646                break;
 647        case CURLINFO_DATA_OUT:
 648                text = "=> Send data";
 649                curl_dump_data(text, (unsigned char *)data, size);
 650                break;
 651        case CURLINFO_SSL_DATA_OUT:
 652                text = "=> Send SSL data";
 653                curl_dump_data(text, (unsigned char *)data, size);
 654                break;
 655        case CURLINFO_HEADER_IN:
 656                text = "<= Recv header";
 657                curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 658                break;
 659        case CURLINFO_DATA_IN:
 660                text = "<= Recv data";
 661                curl_dump_data(text, (unsigned char *)data, size);
 662                break;
 663        case CURLINFO_SSL_DATA_IN:
 664                text = "<= Recv SSL data";
 665                curl_dump_data(text, (unsigned char *)data, size);
 666                break;
 667        }
 668        return 0;
 669}
 670
 671void setup_curl_trace(CURL *handle)
 672{
 673        if (!trace_want(&trace_curl))
 674                return;
 675        curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 676        curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 677        curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 678}
 679
 680static long get_curl_allowed_protocols(int from_user)
 681{
 682        long allowed_protocols = 0;
 683
 684        if (is_transport_allowed("http", from_user))
 685                allowed_protocols |= CURLPROTO_HTTP;
 686        if (is_transport_allowed("https", from_user))
 687                allowed_protocols |= CURLPROTO_HTTPS;
 688        if (is_transport_allowed("ftp", from_user))
 689                allowed_protocols |= CURLPROTO_FTP;
 690        if (is_transport_allowed("ftps", from_user))
 691                allowed_protocols |= CURLPROTO_FTPS;
 692
 693        return allowed_protocols;
 694}
 695
 696static CURL *get_curl_handle(void)
 697{
 698        CURL *result = curl_easy_init();
 699
 700        if (!result)
 701                die("curl_easy_init failed");
 702
 703        if (!curl_ssl_verify) {
 704                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 705                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 706        } else {
 707                /* Verify authenticity of the peer's certificate */
 708                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 709                /* The name in the cert must match whom we tried to connect */
 710                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 711        }
 712
 713#if LIBCURL_VERSION_NUM >= 0x070907
 714        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 715#endif
 716#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 717        curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 718#endif
 719
 720#if LIBCURL_VERSION_NUM >= 0x071600
 721        if (curl_deleg) {
 722                int i;
 723                for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
 724                        if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
 725                                curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
 726                                                curl_deleg_levels[i].curl_deleg_param);
 727                                break;
 728                        }
 729                }
 730                if (i == ARRAY_SIZE(curl_deleg_levels))
 731                        warning("Unknown delegation method '%s': using default",
 732                                curl_deleg);
 733        }
 734#endif
 735
 736        if (http_proactive_auth)
 737                init_curl_http_auth(result);
 738
 739        if (getenv("GIT_SSL_VERSION"))
 740                ssl_version = getenv("GIT_SSL_VERSION");
 741        if (ssl_version && *ssl_version) {
 742                int i;
 743                for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 744                        if (!strcmp(ssl_version, sslversions[i].name)) {
 745                                curl_easy_setopt(result, CURLOPT_SSLVERSION,
 746                                                 sslversions[i].ssl_version);
 747                                break;
 748                        }
 749                }
 750                if (i == ARRAY_SIZE(sslversions))
 751                        warning("unsupported ssl version %s: using default",
 752                                ssl_version);
 753        }
 754
 755        if (getenv("GIT_SSL_CIPHER_LIST"))
 756                ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 757        if (ssl_cipherlist != NULL && *ssl_cipherlist)
 758                curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 759                                ssl_cipherlist);
 760
 761        if (ssl_cert != NULL)
 762                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 763        if (has_cert_password())
 764                curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 765#if LIBCURL_VERSION_NUM >= 0x070903
 766        if (ssl_key != NULL)
 767                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 768#endif
 769#if LIBCURL_VERSION_NUM >= 0x070908
 770        if (ssl_capath != NULL)
 771                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 772#endif
 773#if LIBCURL_VERSION_NUM >= 0x072c00
 774        if (ssl_pinnedkey != NULL)
 775                curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 776#endif
 777        if (ssl_cainfo != NULL)
 778                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 779
 780        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 781                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 782                                 curl_low_speed_limit);
 783                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 784                                 curl_low_speed_time);
 785        }
 786
 787        curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 788#if LIBCURL_VERSION_NUM >= 0x071301
 789        curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 790#elif LIBCURL_VERSION_NUM >= 0x071101
 791        curl_easy_setopt(result, CURLOPT_POST301, 1);
 792#endif
 793#if LIBCURL_VERSION_NUM >= 0x071304
 794        curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
 795                         get_curl_allowed_protocols(0));
 796        curl_easy_setopt(result, CURLOPT_PROTOCOLS,
 797                         get_curl_allowed_protocols(-1));
 798#else
 799        warning("protocol restrictions not applied to curl redirects because\n"
 800                "your curl version is too old (>= 7.19.4)");
 801#endif
 802        if (getenv("GIT_CURL_VERBOSE"))
 803                curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
 804        setup_curl_trace(result);
 805
 806        curl_easy_setopt(result, CURLOPT_USERAGENT,
 807                user_agent ? user_agent : git_user_agent());
 808
 809        if (curl_ftp_no_epsv)
 810                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 811
 812#ifdef CURLOPT_USE_SSL
 813        if (curl_ssl_try)
 814                curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 815#endif
 816
 817        /*
 818         * CURL also examines these variables as a fallback; but we need to query
 819         * them here in order to decide whether to prompt for missing password (cf.
 820         * init_curl_proxy_auth()).
 821         *
 822         * Unlike many other common environment variables, these are historically
 823         * lowercase only. It appears that CURL did not know this and implemented
 824         * only uppercase variants, which was later corrected to take both - with
 825         * the exception of http_proxy, which is lowercase only also in CURL. As
 826         * the lowercase versions are the historical quasi-standard, they take
 827         * precedence here, as in CURL.
 828         */
 829        if (!curl_http_proxy) {
 830                if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
 831                        var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 832                        var_override(&curl_http_proxy, getenv("https_proxy"));
 833                } else {
 834                        var_override(&curl_http_proxy, getenv("http_proxy"));
 835                }
 836                if (!curl_http_proxy) {
 837                        var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 838                        var_override(&curl_http_proxy, getenv("all_proxy"));
 839                }
 840        }
 841
 842        if (curl_http_proxy && curl_http_proxy[0] == '\0') {
 843                /*
 844                 * Handle case with the empty http.proxy value here to keep
 845                 * common code clean.
 846                 * NB: empty option disables proxying at all.
 847                 */
 848                curl_easy_setopt(result, CURLOPT_PROXY, "");
 849        } else if (curl_http_proxy) {
 850#if LIBCURL_VERSION_NUM >= 0x071800
 851                if (starts_with(curl_http_proxy, "socks5h"))
 852                        curl_easy_setopt(result,
 853                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
 854                else if (starts_with(curl_http_proxy, "socks5"))
 855                        curl_easy_setopt(result,
 856                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 857                else if (starts_with(curl_http_proxy, "socks4a"))
 858                        curl_easy_setopt(result,
 859                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 860                else if (starts_with(curl_http_proxy, "socks"))
 861                        curl_easy_setopt(result,
 862                                CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 863#endif
 864                if (strstr(curl_http_proxy, "://"))
 865                        credential_from_url(&proxy_auth, curl_http_proxy);
 866                else {
 867                        struct strbuf url = STRBUF_INIT;
 868                        strbuf_addf(&url, "http://%s", curl_http_proxy);
 869                        credential_from_url(&proxy_auth, url.buf);
 870                        strbuf_release(&url);
 871                }
 872
 873                if (!proxy_auth.host)
 874                        die("Invalid proxy URL '%s'", curl_http_proxy);
 875
 876                curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 877#if LIBCURL_VERSION_NUM >= 0x071304
 878                var_override(&curl_no_proxy, getenv("NO_PROXY"));
 879                var_override(&curl_no_proxy, getenv("no_proxy"));
 880                curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 881#endif
 882        }
 883        init_curl_proxy_auth(result);
 884
 885        set_curl_keepalive(result);
 886
 887        return result;
 888}
 889
 890static void set_from_env(const char **var, const char *envname)
 891{
 892        const char *val = getenv(envname);
 893        if (val)
 894                *var = val;
 895}
 896
 897void http_init(struct remote *remote, const char *url, int proactive_auth)
 898{
 899        char *low_speed_limit;
 900        char *low_speed_time;
 901        char *normalized_url;
 902        struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 903
 904        config.section = "http";
 905        config.key = NULL;
 906        config.collect_fn = http_options;
 907        config.cascade_fn = git_default_config;
 908        config.cb = NULL;
 909
 910        http_is_verbose = 0;
 911        normalized_url = url_normalize(url, &config.url);
 912
 913        git_config(urlmatch_config_entry, &config);
 914        free(normalized_url);
 915
 916        if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 917                die("curl_global_init failed");
 918
 919        http_proactive_auth = proactive_auth;
 920
 921        if (remote && remote->http_proxy)
 922                curl_http_proxy = xstrdup(remote->http_proxy);
 923
 924        if (remote)
 925                var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 926
 927        pragma_header = curl_slist_append(http_copy_default_headers(),
 928                "Pragma: no-cache");
 929        no_pragma_header = curl_slist_append(http_copy_default_headers(),
 930                "Pragma:");
 931
 932#ifdef USE_CURL_MULTI
 933        {
 934                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 935                if (http_max_requests != NULL)
 936                        max_requests = atoi(http_max_requests);
 937        }
 938
 939        curlm = curl_multi_init();
 940        if (!curlm)
 941                die("curl_multi_init failed");
 942#endif
 943
 944        if (getenv("GIT_SSL_NO_VERIFY"))
 945                curl_ssl_verify = 0;
 946
 947        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 948#if LIBCURL_VERSION_NUM >= 0x070903
 949        set_from_env(&ssl_key, "GIT_SSL_KEY");
 950#endif
 951#if LIBCURL_VERSION_NUM >= 0x070908
 952        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 953#endif
 954        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 955
 956        set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 957
 958        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 959        if (low_speed_limit != NULL)
 960                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 961        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 962        if (low_speed_time != NULL)
 963                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 964
 965        if (curl_ssl_verify == -1)
 966                curl_ssl_verify = 1;
 967
 968        curl_session_count = 0;
 969#ifdef USE_CURL_MULTI
 970        if (max_requests < 1)
 971                max_requests = DEFAULT_MAX_REQUESTS;
 972#endif
 973
 974        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 975                curl_ftp_no_epsv = 1;
 976
 977        if (url) {
 978                credential_from_url(&http_auth, url);
 979                if (!ssl_cert_password_required &&
 980                    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 981                    starts_with(url, "https://"))
 982                        ssl_cert_password_required = 1;
 983        }
 984
 985#ifndef NO_CURL_EASY_DUPHANDLE
 986        curl_default = get_curl_handle();
 987#endif
 988}
 989
 990void http_cleanup(void)
 991{
 992        struct active_request_slot *slot = active_queue_head;
 993
 994        while (slot != NULL) {
 995                struct active_request_slot *next = slot->next;
 996                if (slot->curl != NULL) {
 997                        xmulti_remove_handle(slot);
 998                        curl_easy_cleanup(slot->curl);
 999                }
1000                free(slot);
1001                slot = next;
1002        }
1003        active_queue_head = NULL;
1004
1005#ifndef NO_CURL_EASY_DUPHANDLE
1006        curl_easy_cleanup(curl_default);
1007#endif
1008
1009#ifdef USE_CURL_MULTI
1010        curl_multi_cleanup(curlm);
1011#endif
1012        curl_global_cleanup();
1013
1014        curl_slist_free_all(extra_http_headers);
1015        extra_http_headers = NULL;
1016
1017        curl_slist_free_all(pragma_header);
1018        pragma_header = NULL;
1019
1020        curl_slist_free_all(no_pragma_header);
1021        no_pragma_header = NULL;
1022
1023        if (curl_http_proxy) {
1024                free((void *)curl_http_proxy);
1025                curl_http_proxy = NULL;
1026        }
1027
1028        if (proxy_auth.password) {
1029                memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1030                FREE_AND_NULL(proxy_auth.password);
1031        }
1032
1033        free((void *)curl_proxyuserpwd);
1034        curl_proxyuserpwd = NULL;
1035
1036        free((void *)http_proxy_authmethod);
1037        http_proxy_authmethod = NULL;
1038
1039        if (cert_auth.password != NULL) {
1040                memset(cert_auth.password, 0, strlen(cert_auth.password));
1041                FREE_AND_NULL(cert_auth.password);
1042        }
1043        ssl_cert_password_required = 0;
1044
1045        FREE_AND_NULL(cached_accept_language);
1046}
1047
1048struct active_request_slot *get_active_slot(void)
1049{
1050        struct active_request_slot *slot = active_queue_head;
1051        struct active_request_slot *newslot;
1052
1053#ifdef USE_CURL_MULTI
1054        int num_transfers;
1055
1056        /* Wait for a slot to open up if the queue is full */
1057        while (active_requests >= max_requests) {
1058                curl_multi_perform(curlm, &num_transfers);
1059                if (num_transfers < active_requests)
1060                        process_curl_messages();
1061        }
1062#endif
1063
1064        while (slot != NULL && slot->in_use)
1065                slot = slot->next;
1066
1067        if (slot == NULL) {
1068                newslot = xmalloc(sizeof(*newslot));
1069                newslot->curl = NULL;
1070                newslot->in_use = 0;
1071                newslot->next = NULL;
1072
1073                slot = active_queue_head;
1074                if (slot == NULL) {
1075                        active_queue_head = newslot;
1076                } else {
1077                        while (slot->next != NULL)
1078                                slot = slot->next;
1079                        slot->next = newslot;
1080                }
1081                slot = newslot;
1082        }
1083
1084        if (slot->curl == NULL) {
1085#ifdef NO_CURL_EASY_DUPHANDLE
1086                slot->curl = get_curl_handle();
1087#else
1088                slot->curl = curl_easy_duphandle(curl_default);
1089#endif
1090                curl_session_count++;
1091        }
1092
1093        active_requests++;
1094        slot->in_use = 1;
1095        slot->results = NULL;
1096        slot->finished = NULL;
1097        slot->callback_data = NULL;
1098        slot->callback_func = NULL;
1099        curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1100        if (curl_save_cookies)
1101                curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1102        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1103        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1104        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1105        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1106        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1107        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1108        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1109        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1110        curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1111        curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1112
1113        /*
1114         * Default following to off unless "ALWAYS" is configured; this gives
1115         * callers a sane starting point, and they can tweak for individual
1116         * HTTP_FOLLOW_* cases themselves.
1117         */
1118        if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1119                curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1120        else
1121                curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1122
1123#if LIBCURL_VERSION_NUM >= 0x070a08
1124        curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1125#endif
1126#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1127        curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1128#endif
1129        if (http_auth.password || curl_empty_auth_enabled())
1130                init_curl_http_auth(slot->curl);
1131
1132        return slot;
1133}
1134
1135int start_active_slot(struct active_request_slot *slot)
1136{
1137#ifdef USE_CURL_MULTI
1138        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1139        int num_transfers;
1140
1141        if (curlm_result != CURLM_OK &&
1142            curlm_result != CURLM_CALL_MULTI_PERFORM) {
1143                warning("curl_multi_add_handle failed: %s",
1144                        curl_multi_strerror(curlm_result));
1145                active_requests--;
1146                slot->in_use = 0;
1147                return 0;
1148        }
1149
1150        /*
1151         * We know there must be something to do, since we just added
1152         * something.
1153         */
1154        curl_multi_perform(curlm, &num_transfers);
1155#endif
1156        return 1;
1157}
1158
1159#ifdef USE_CURL_MULTI
1160struct fill_chain {
1161        void *data;
1162        int (*fill)(void *);
1163        struct fill_chain *next;
1164};
1165
1166static struct fill_chain *fill_cfg;
1167
1168void add_fill_function(void *data, int (*fill)(void *))
1169{
1170        struct fill_chain *new = xmalloc(sizeof(*new));
1171        struct fill_chain **linkp = &fill_cfg;
1172        new->data = data;
1173        new->fill = fill;
1174        new->next = NULL;
1175        while (*linkp)
1176                linkp = &(*linkp)->next;
1177        *linkp = new;
1178}
1179
1180void fill_active_slots(void)
1181{
1182        struct active_request_slot *slot = active_queue_head;
1183
1184        while (active_requests < max_requests) {
1185                struct fill_chain *fill;
1186                for (fill = fill_cfg; fill; fill = fill->next)
1187                        if (fill->fill(fill->data))
1188                                break;
1189
1190                if (!fill)
1191                        break;
1192        }
1193
1194        while (slot != NULL) {
1195                if (!slot->in_use && slot->curl != NULL
1196                        && curl_session_count > min_curl_sessions) {
1197                        curl_easy_cleanup(slot->curl);
1198                        slot->curl = NULL;
1199                        curl_session_count--;
1200                }
1201                slot = slot->next;
1202        }
1203}
1204
1205void step_active_slots(void)
1206{
1207        int num_transfers;
1208        CURLMcode curlm_result;
1209
1210        do {
1211                curlm_result = curl_multi_perform(curlm, &num_transfers);
1212        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1213        if (num_transfers < active_requests) {
1214                process_curl_messages();
1215                fill_active_slots();
1216        }
1217}
1218#endif
1219
1220void run_active_slot(struct active_request_slot *slot)
1221{
1222#ifdef USE_CURL_MULTI
1223        fd_set readfds;
1224        fd_set writefds;
1225        fd_set excfds;
1226        int max_fd;
1227        struct timeval select_timeout;
1228        int finished = 0;
1229
1230        slot->finished = &finished;
1231        while (!finished) {
1232                step_active_slots();
1233
1234                if (slot->in_use) {
1235#if LIBCURL_VERSION_NUM >= 0x070f04
1236                        long curl_timeout;
1237                        curl_multi_timeout(curlm, &curl_timeout);
1238                        if (curl_timeout == 0) {
1239                                continue;
1240                        } else if (curl_timeout == -1) {
1241                                select_timeout.tv_sec  = 0;
1242                                select_timeout.tv_usec = 50000;
1243                        } else {
1244                                select_timeout.tv_sec  =  curl_timeout / 1000;
1245                                select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1246                        }
1247#else
1248                        select_timeout.tv_sec  = 0;
1249                        select_timeout.tv_usec = 50000;
1250#endif
1251
1252                        max_fd = -1;
1253                        FD_ZERO(&readfds);
1254                        FD_ZERO(&writefds);
1255                        FD_ZERO(&excfds);
1256                        curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1257
1258                        /*
1259                         * It can happen that curl_multi_timeout returns a pathologically
1260                         * long timeout when curl_multi_fdset returns no file descriptors
1261                         * to read.  See commit message for more details.
1262                         */
1263                        if (max_fd < 0 &&
1264                            (select_timeout.tv_sec > 0 ||
1265                             select_timeout.tv_usec > 50000)) {
1266                                select_timeout.tv_sec  = 0;
1267                                select_timeout.tv_usec = 50000;
1268                        }
1269
1270                        select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1271                }
1272        }
1273#else
1274        while (slot->in_use) {
1275                slot->curl_result = curl_easy_perform(slot->curl);
1276                finish_active_slot(slot);
1277        }
1278#endif
1279}
1280
1281static void release_active_slot(struct active_request_slot *slot)
1282{
1283        closedown_active_slot(slot);
1284        if (slot->curl) {
1285                xmulti_remove_handle(slot);
1286                if (curl_session_count > min_curl_sessions) {
1287                        curl_easy_cleanup(slot->curl);
1288                        slot->curl = NULL;
1289                        curl_session_count--;
1290                }
1291        }
1292#ifdef USE_CURL_MULTI
1293        fill_active_slots();
1294#endif
1295}
1296
1297void finish_all_active_slots(void)
1298{
1299        struct active_request_slot *slot = active_queue_head;
1300
1301        while (slot != NULL)
1302                if (slot->in_use) {
1303                        run_active_slot(slot);
1304                        slot = active_queue_head;
1305                } else {
1306                        slot = slot->next;
1307                }
1308}
1309
1310/* Helpers for modifying and creating URLs */
1311static inline int needs_quote(int ch)
1312{
1313        if (((ch >= 'A') && (ch <= 'Z'))
1314                        || ((ch >= 'a') && (ch <= 'z'))
1315                        || ((ch >= '0') && (ch <= '9'))
1316                        || (ch == '/')
1317                        || (ch == '-')
1318                        || (ch == '.'))
1319                return 0;
1320        return 1;
1321}
1322
1323static char *quote_ref_url(const char *base, const char *ref)
1324{
1325        struct strbuf buf = STRBUF_INIT;
1326        const char *cp;
1327        int ch;
1328
1329        end_url_with_slash(&buf, base);
1330
1331        for (cp = ref; (ch = *cp) != 0; cp++)
1332                if (needs_quote(ch))
1333                        strbuf_addf(&buf, "%%%02x", ch);
1334                else
1335                        strbuf_addch(&buf, *cp);
1336
1337        return strbuf_detach(&buf, NULL);
1338}
1339
1340void append_remote_object_url(struct strbuf *buf, const char *url,
1341                              const char *hex,
1342                              int only_two_digit_prefix)
1343{
1344        end_url_with_slash(buf, url);
1345
1346        strbuf_addf(buf, "objects/%.*s/", 2, hex);
1347        if (!only_two_digit_prefix)
1348                strbuf_addstr(buf, hex + 2);
1349}
1350
1351char *get_remote_object_url(const char *url, const char *hex,
1352                            int only_two_digit_prefix)
1353{
1354        struct strbuf buf = STRBUF_INIT;
1355        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1356        return strbuf_detach(&buf, NULL);
1357}
1358
1359static int handle_curl_result(struct slot_results *results)
1360{
1361        /*
1362         * If we see a failing http code with CURLE_OK, we have turned off
1363         * FAILONERROR (to keep the server's custom error response), and should
1364         * translate the code into failure here.
1365         *
1366         * Likewise, if we see a redirect (30x code), that means we turned off
1367         * redirect-following, and we should treat the result as an error.
1368         */
1369        if (results->curl_result == CURLE_OK &&
1370            results->http_code >= 300) {
1371                results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1372                /*
1373                 * Normally curl will already have put the "reason phrase"
1374                 * from the server into curl_errorstr; unfortunately without
1375                 * FAILONERROR it is lost, so we can give only the numeric
1376                 * status code.
1377                 */
1378                xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1379                          "The requested URL returned error: %ld",
1380                          results->http_code);
1381        }
1382
1383        if (results->curl_result == CURLE_OK) {
1384                credential_approve(&http_auth);
1385                if (proxy_auth.password)
1386                        credential_approve(&proxy_auth);
1387                return HTTP_OK;
1388        } else if (missing_target(results))
1389                return HTTP_MISSING_TARGET;
1390        else if (results->http_code == 401) {
1391                if (http_auth.username && http_auth.password) {
1392                        credential_reject(&http_auth);
1393                        return HTTP_NOAUTH;
1394                } else {
1395#ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1396                        http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1397                        if (results->auth_avail) {
1398                                http_auth_methods &= results->auth_avail;
1399                                http_auth_methods_restricted = 1;
1400                        }
1401#endif
1402                        return HTTP_REAUTH;
1403                }
1404        } else {
1405                if (results->http_connectcode == 407)
1406                        credential_reject(&proxy_auth);
1407#if LIBCURL_VERSION_NUM >= 0x070c00
1408                if (!curl_errorstr[0])
1409                        strlcpy(curl_errorstr,
1410                                curl_easy_strerror(results->curl_result),
1411                                sizeof(curl_errorstr));
1412#endif
1413                return HTTP_ERROR;
1414        }
1415}
1416
1417int run_one_slot(struct active_request_slot *slot,
1418                 struct slot_results *results)
1419{
1420        slot->results = results;
1421        if (!start_active_slot(slot)) {
1422                xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1423                          "failed to start HTTP request");
1424                return HTTP_START_FAILED;
1425        }
1426
1427        run_active_slot(slot);
1428        return handle_curl_result(results);
1429}
1430
1431struct curl_slist *http_copy_default_headers(void)
1432{
1433        struct curl_slist *headers = NULL, *h;
1434
1435        for (h = extra_http_headers; h; h = h->next)
1436                headers = curl_slist_append(headers, h->data);
1437
1438        return headers;
1439}
1440
1441static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1442{
1443        char *ptr;
1444        CURLcode ret;
1445
1446        strbuf_reset(buf);
1447        ret = curl_easy_getinfo(curl, info, &ptr);
1448        if (!ret && ptr)
1449                strbuf_addstr(buf, ptr);
1450        return ret;
1451}
1452
1453/*
1454 * Check for and extract a content-type parameter. "raw"
1455 * should be positioned at the start of the potential
1456 * parameter, with any whitespace already removed.
1457 *
1458 * "name" is the name of the parameter. The value is appended
1459 * to "out".
1460 */
1461static int extract_param(const char *raw, const char *name,
1462                         struct strbuf *out)
1463{
1464        size_t len = strlen(name);
1465
1466        if (strncasecmp(raw, name, len))
1467                return -1;
1468        raw += len;
1469
1470        if (*raw != '=')
1471                return -1;
1472        raw++;
1473
1474        while (*raw && !isspace(*raw) && *raw != ';')
1475                strbuf_addch(out, *raw++);
1476        return 0;
1477}
1478
1479/*
1480 * Extract a normalized version of the content type, with any
1481 * spaces suppressed, all letters lowercased, and no trailing ";"
1482 * or parameters.
1483 *
1484 * Note that we will silently remove even invalid whitespace. For
1485 * example, "text / plain" is specifically forbidden by RFC 2616,
1486 * but "text/plain" is the only reasonable output, and this keeps
1487 * our code simple.
1488 *
1489 * If the "charset" argument is not NULL, store the value of any
1490 * charset parameter there.
1491 *
1492 * Example:
1493 *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1494 *   "text / plain" -> "text/plain"
1495 */
1496static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1497                                 struct strbuf *charset)
1498{
1499        const char *p;
1500
1501        strbuf_reset(type);
1502        strbuf_grow(type, raw->len);
1503        for (p = raw->buf; *p; p++) {
1504                if (isspace(*p))
1505                        continue;
1506                if (*p == ';') {
1507                        p++;
1508                        break;
1509                }
1510                strbuf_addch(type, tolower(*p));
1511        }
1512
1513        if (!charset)
1514                return;
1515
1516        strbuf_reset(charset);
1517        while (*p) {
1518                while (isspace(*p) || *p == ';')
1519                        p++;
1520                if (!extract_param(p, "charset", charset))
1521                        return;
1522                while (*p && !isspace(*p))
1523                        p++;
1524        }
1525
1526        if (!charset->len && starts_with(type->buf, "text/"))
1527                strbuf_addstr(charset, "ISO-8859-1");
1528}
1529
1530static void write_accept_language(struct strbuf *buf)
1531{
1532        /*
1533         * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1534         * that, q-value will be smaller than 0.001, the minimum q-value the
1535         * HTTP specification allows. See
1536         * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1537         */
1538        const int MAX_DECIMAL_PLACES = 3;
1539        const int MAX_LANGUAGE_TAGS = 1000;
1540        const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1541        char **language_tags = NULL;
1542        int num_langs = 0;
1543        const char *s = get_preferred_languages();
1544        int i;
1545        struct strbuf tag = STRBUF_INIT;
1546
1547        /* Don't add Accept-Language header if no language is preferred. */
1548        if (!s)
1549                return;
1550
1551        /*
1552         * Split the colon-separated string of preferred languages into
1553         * language_tags array.
1554         */
1555        do {
1556                /* collect language tag */
1557                for (; *s && (isalnum(*s) || *s == '_'); s++)
1558                        strbuf_addch(&tag, *s == '_' ? '-' : *s);
1559
1560                /* skip .codeset, @modifier and any other unnecessary parts */
1561                while (*s && *s != ':')
1562                        s++;
1563
1564                if (tag.len) {
1565                        num_langs++;
1566                        REALLOC_ARRAY(language_tags, num_langs);
1567                        language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1568                        if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1569                                break;
1570                }
1571        } while (*s++);
1572
1573        /* write Accept-Language header into buf */
1574        if (num_langs) {
1575                int last_buf_len = 0;
1576                int max_q;
1577                int decimal_places;
1578                char q_format[32];
1579
1580                /* add '*' */
1581                REALLOC_ARRAY(language_tags, num_langs + 1);
1582                language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1583
1584                /* compute decimal_places */
1585                for (max_q = 1, decimal_places = 0;
1586                     max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1587                     decimal_places++, max_q *= 10)
1588                        ;
1589
1590                xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1591
1592                strbuf_addstr(buf, "Accept-Language: ");
1593
1594                for (i = 0; i < num_langs; i++) {
1595                        if (i > 0)
1596                                strbuf_addstr(buf, ", ");
1597
1598                        strbuf_addstr(buf, language_tags[i]);
1599
1600                        if (i > 0)
1601                                strbuf_addf(buf, q_format, max_q - i);
1602
1603                        if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1604                                strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1605                                break;
1606                        }
1607
1608                        last_buf_len = buf->len;
1609                }
1610        }
1611
1612        /* free language tags -- last one is a static '*' */
1613        for (i = 0; i < num_langs - 1; i++)
1614                free(language_tags[i]);
1615        free(language_tags);
1616}
1617
1618/*
1619 * Get an Accept-Language header which indicates user's preferred languages.
1620 *
1621 * Examples:
1622 *   LANGUAGE= -> ""
1623 *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1624 *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1625 *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1626 *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1627 *   LANGUAGE= LANG=C -> ""
1628 */
1629static const char *get_accept_language(void)
1630{
1631        if (!cached_accept_language) {
1632                struct strbuf buf = STRBUF_INIT;
1633                write_accept_language(&buf);
1634                if (buf.len > 0)
1635                        cached_accept_language = strbuf_detach(&buf, NULL);
1636        }
1637
1638        return cached_accept_language;
1639}
1640
1641static void http_opt_request_remainder(CURL *curl, off_t pos)
1642{
1643        char buf[128];
1644        xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1645        curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1646}
1647
1648/* http_request() targets */
1649#define HTTP_REQUEST_STRBUF     0
1650#define HTTP_REQUEST_FILE       1
1651
1652static int http_request(const char *url,
1653                        void *result, int target,
1654                        const struct http_get_options *options)
1655{
1656        struct active_request_slot *slot;
1657        struct slot_results results;
1658        struct curl_slist *headers = http_copy_default_headers();
1659        struct strbuf buf = STRBUF_INIT;
1660        const char *accept_language;
1661        int ret;
1662
1663        slot = get_active_slot();
1664        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1665
1666        if (result == NULL) {
1667                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1668        } else {
1669                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1670                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1671
1672                if (target == HTTP_REQUEST_FILE) {
1673                        off_t posn = ftello(result);
1674                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1675                                         fwrite);
1676                        if (posn > 0)
1677                                http_opt_request_remainder(slot->curl, posn);
1678                } else
1679                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1680                                         fwrite_buffer);
1681        }
1682
1683        accept_language = get_accept_language();
1684
1685        if (accept_language)
1686                headers = curl_slist_append(headers, accept_language);
1687
1688        strbuf_addstr(&buf, "Pragma:");
1689        if (options && options->no_cache)
1690                strbuf_addstr(&buf, " no-cache");
1691        if (options && options->keep_error)
1692                curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1693        if (options && options->initial_request &&
1694            http_follow_config == HTTP_FOLLOW_INITIAL)
1695                curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1696
1697        headers = curl_slist_append(headers, buf.buf);
1698
1699        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1700        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1701        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1702
1703        ret = run_one_slot(slot, &results);
1704
1705        if (options && options->content_type) {
1706                struct strbuf raw = STRBUF_INIT;
1707                curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1708                extract_content_type(&raw, options->content_type,
1709                                     options->charset);
1710                strbuf_release(&raw);
1711        }
1712
1713        if (options && options->effective_url)
1714                curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1715                                options->effective_url);
1716
1717        curl_slist_free_all(headers);
1718        strbuf_release(&buf);
1719
1720        return ret;
1721}
1722
1723/*
1724 * Update the "base" url to a more appropriate value, as deduced by
1725 * redirects seen when requesting a URL starting with "url".
1726 *
1727 * The "asked" parameter is a URL that we asked curl to access, and must begin
1728 * with "base".
1729 *
1730 * The "got" parameter is the URL that curl reported to us as where we ended
1731 * up.
1732 *
1733 * Returns 1 if we updated the base url, 0 otherwise.
1734 *
1735 * Our basic strategy is to compare "base" and "asked" to find the bits
1736 * specific to our request. We then strip those bits off of "got" to yield the
1737 * new base. So for example, if our base is "http://example.com/foo.git",
1738 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1739 * with "https://other.example.com/foo.git/info/refs". We would want the
1740 * new URL to become "https://other.example.com/foo.git".
1741 *
1742 * Note that this assumes a sane redirect scheme. It's entirely possible
1743 * in the example above to end up at a URL that does not even end in
1744 * "info/refs".  In such a case we die. There's not much we can do, such a
1745 * scheme is unlikely to represent a real git repository, and failing to
1746 * rewrite the base opens options for malicious redirects to do funny things.
1747 */
1748static int update_url_from_redirect(struct strbuf *base,
1749                                    const char *asked,
1750                                    const struct strbuf *got)
1751{
1752        const char *tail;
1753        size_t new_len;
1754
1755        if (!strcmp(asked, got->buf))
1756                return 0;
1757
1758        if (!skip_prefix(asked, base->buf, &tail))
1759                die("BUG: update_url_from_redirect: %s is not a superset of %s",
1760                    asked, base->buf);
1761
1762        new_len = got->len;
1763        if (!strip_suffix_mem(got->buf, &new_len, tail))
1764                die(_("unable to update url base from redirection:\n"
1765                      "  asked for: %s\n"
1766                      "   redirect: %s"),
1767                    asked, got->buf);
1768
1769        strbuf_reset(base);
1770        strbuf_add(base, got->buf, new_len);
1771
1772        return 1;
1773}
1774
1775static int http_request_reauth(const char *url,
1776                               void *result, int target,
1777                               struct http_get_options *options)
1778{
1779        int ret = http_request(url, result, target, options);
1780
1781        if (ret != HTTP_OK && ret != HTTP_REAUTH)
1782                return ret;
1783
1784        if (options && options->effective_url && options->base_url) {
1785                if (update_url_from_redirect(options->base_url,
1786                                             url, options->effective_url)) {
1787                        credential_from_url(&http_auth, options->base_url->buf);
1788                        url = options->effective_url->buf;
1789                }
1790        }
1791
1792        if (ret != HTTP_REAUTH)
1793                return ret;
1794
1795        /*
1796         * If we are using KEEP_ERROR, the previous request may have
1797         * put cruft into our output stream; we should clear it out before
1798         * making our next request. We only know how to do this for
1799         * the strbuf case, but that is enough to satisfy current callers.
1800         */
1801        if (options && options->keep_error) {
1802                switch (target) {
1803                case HTTP_REQUEST_STRBUF:
1804                        strbuf_reset(result);
1805                        break;
1806                default:
1807                        die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1808                }
1809        }
1810
1811        credential_fill(&http_auth);
1812
1813        return http_request(url, result, target, options);
1814}
1815
1816int http_get_strbuf(const char *url,
1817                    struct strbuf *result,
1818                    struct http_get_options *options)
1819{
1820        return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1821}
1822
1823/*
1824 * Downloads a URL and stores the result in the given file.
1825 *
1826 * If a previous interrupted download is detected (i.e. a previous temporary
1827 * file is still around) the download is resumed.
1828 */
1829static int http_get_file(const char *url, const char *filename,
1830                         struct http_get_options *options)
1831{
1832        int ret;
1833        struct strbuf tmpfile = STRBUF_INIT;
1834        FILE *result;
1835
1836        strbuf_addf(&tmpfile, "%s.temp", filename);
1837        result = fopen(tmpfile.buf, "a");
1838        if (!result) {
1839                error("Unable to open local file %s", tmpfile.buf);
1840                ret = HTTP_ERROR;
1841                goto cleanup;
1842        }
1843
1844        ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1845        fclose(result);
1846
1847        if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1848                ret = HTTP_ERROR;
1849cleanup:
1850        strbuf_release(&tmpfile);
1851        return ret;
1852}
1853
1854int http_fetch_ref(const char *base, struct ref *ref)
1855{
1856        struct http_get_options options = {0};
1857        char *url;
1858        struct strbuf buffer = STRBUF_INIT;
1859        int ret = -1;
1860
1861        options.no_cache = 1;
1862
1863        url = quote_ref_url(base, ref->name);
1864        if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1865                strbuf_rtrim(&buffer);
1866                if (buffer.len == 40)
1867                        ret = get_oid_hex(buffer.buf, &ref->old_oid);
1868                else if (starts_with(buffer.buf, "ref: ")) {
1869                        ref->symref = xstrdup(buffer.buf + 5);
1870                        ret = 0;
1871                }
1872        }
1873
1874        strbuf_release(&buffer);
1875        free(url);
1876        return ret;
1877}
1878
1879/* Helpers for fetching packs */
1880static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1881{
1882        char *url, *tmp;
1883        struct strbuf buf = STRBUF_INIT;
1884
1885        if (http_is_verbose)
1886                fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1887
1888        end_url_with_slash(&buf, base_url);
1889        strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1890        url = strbuf_detach(&buf, NULL);
1891
1892        strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1893        tmp = strbuf_detach(&buf, NULL);
1894
1895        if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1896                error("Unable to get pack index %s", url);
1897                FREE_AND_NULL(tmp);
1898        }
1899
1900        free(url);
1901        return tmp;
1902}
1903
1904static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1905        unsigned char *sha1, const char *base_url)
1906{
1907        struct packed_git *new_pack;
1908        char *tmp_idx = NULL;
1909        int ret;
1910
1911        if (has_pack_index(sha1)) {
1912                new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1913                if (!new_pack)
1914                        return -1; /* parse_pack_index() already issued error message */
1915                goto add_pack;
1916        }
1917
1918        tmp_idx = fetch_pack_index(sha1, base_url);
1919        if (!tmp_idx)
1920                return -1;
1921
1922        new_pack = parse_pack_index(sha1, tmp_idx);
1923        if (!new_pack) {
1924                unlink(tmp_idx);
1925                free(tmp_idx);
1926
1927                return -1; /* parse_pack_index() already issued error message */
1928        }
1929
1930        ret = verify_pack_index(new_pack);
1931        if (!ret) {
1932                close_pack_index(new_pack);
1933                ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1934        }
1935        free(tmp_idx);
1936        if (ret)
1937                return -1;
1938
1939add_pack:
1940        new_pack->next = *packs_head;
1941        *packs_head = new_pack;
1942        return 0;
1943}
1944
1945int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1946{
1947        struct http_get_options options = {0};
1948        int ret = 0, i = 0;
1949        char *url, *data;
1950        struct strbuf buf = STRBUF_INIT;
1951        unsigned char sha1[20];
1952
1953        end_url_with_slash(&buf, base_url);
1954        strbuf_addstr(&buf, "objects/info/packs");
1955        url = strbuf_detach(&buf, NULL);
1956
1957        options.no_cache = 1;
1958        ret = http_get_strbuf(url, &buf, &options);
1959        if (ret != HTTP_OK)
1960                goto cleanup;
1961
1962        data = buf.buf;
1963        while (i < buf.len) {
1964                switch (data[i]) {
1965                case 'P':
1966                        i++;
1967                        if (i + 52 <= buf.len &&
1968                            starts_with(data + i, " pack-") &&
1969                            starts_with(data + i + 46, ".pack\n")) {
1970                                get_sha1_hex(data + i + 6, sha1);
1971                                fetch_and_setup_pack_index(packs_head, sha1,
1972                                                      base_url);
1973                                i += 51;
1974                                break;
1975                        }
1976                default:
1977                        while (i < buf.len && data[i] != '\n')
1978                                i++;
1979                }
1980                i++;
1981        }
1982
1983cleanup:
1984        free(url);
1985        return ret;
1986}
1987
1988void release_http_pack_request(struct http_pack_request *preq)
1989{
1990        if (preq->packfile != NULL) {
1991                fclose(preq->packfile);
1992                preq->packfile = NULL;
1993        }
1994        preq->slot = NULL;
1995        free(preq->url);
1996        free(preq);
1997}
1998
1999int finish_http_pack_request(struct http_pack_request *preq)
2000{
2001        struct packed_git **lst;
2002        struct packed_git *p = preq->target;
2003        char *tmp_idx;
2004        size_t len;
2005        struct child_process ip = CHILD_PROCESS_INIT;
2006        const char *ip_argv[8];
2007
2008        close_pack_index(p);
2009
2010        fclose(preq->packfile);
2011        preq->packfile = NULL;
2012
2013        lst = preq->lst;
2014        while (*lst != p)
2015                lst = &((*lst)->next);
2016        *lst = (*lst)->next;
2017
2018        if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2019                die("BUG: pack tmpfile does not end in .pack.temp?");
2020        tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2021
2022        ip_argv[0] = "index-pack";
2023        ip_argv[1] = "-o";
2024        ip_argv[2] = tmp_idx;
2025        ip_argv[3] = preq->tmpfile;
2026        ip_argv[4] = NULL;
2027
2028        ip.argv = ip_argv;
2029        ip.git_cmd = 1;
2030        ip.no_stdin = 1;
2031        ip.no_stdout = 1;
2032
2033        if (run_command(&ip)) {
2034                unlink(preq->tmpfile);
2035                unlink(tmp_idx);
2036                free(tmp_idx);
2037                return -1;
2038        }
2039
2040        unlink(sha1_pack_index_name(p->sha1));
2041
2042        if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2043         || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2044                free(tmp_idx);
2045                return -1;
2046        }
2047
2048        install_packed_git(p);
2049        free(tmp_idx);
2050        return 0;
2051}
2052
2053struct http_pack_request *new_http_pack_request(
2054        struct packed_git *target, const char *base_url)
2055{
2056        off_t prev_posn = 0;
2057        struct strbuf buf = STRBUF_INIT;
2058        struct http_pack_request *preq;
2059
2060        preq = xcalloc(1, sizeof(*preq));
2061        preq->target = target;
2062
2063        end_url_with_slash(&buf, base_url);
2064        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2065                sha1_to_hex(target->sha1));
2066        preq->url = strbuf_detach(&buf, NULL);
2067
2068        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2069                sha1_pack_name(target->sha1));
2070        preq->packfile = fopen(preq->tmpfile, "a");
2071        if (!preq->packfile) {
2072                error("Unable to open local file %s for pack",
2073                      preq->tmpfile);
2074                goto abort;
2075        }
2076
2077        preq->slot = get_active_slot();
2078        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2079        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2080        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2081        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2082                no_pragma_header);
2083
2084        /*
2085         * If there is data present from a previous transfer attempt,
2086         * resume where it left off
2087         */
2088        prev_posn = ftello(preq->packfile);
2089        if (prev_posn>0) {
2090                if (http_is_verbose)
2091                        fprintf(stderr,
2092                                "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2093                                sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2094                http_opt_request_remainder(preq->slot->curl, prev_posn);
2095        }
2096
2097        return preq;
2098
2099abort:
2100        free(preq->url);
2101        free(preq);
2102        return NULL;
2103}
2104
2105/* Helpers for fetching objects (loose) */
2106static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2107                               void *data)
2108{
2109        unsigned char expn[4096];
2110        size_t size = eltsize * nmemb;
2111        int posn = 0;
2112        struct http_object_request *freq = data;
2113        struct active_request_slot *slot = freq->slot;
2114
2115        if (slot) {
2116                CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2117                                                &slot->http_code);
2118                if (c != CURLE_OK)
2119                        die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2120                                curl_easy_strerror(c));
2121                if (slot->http_code >= 300)
2122                        return size;
2123        }
2124
2125        do {
2126                ssize_t retval = xwrite(freq->localfile,
2127                                        (char *) ptr + posn, size - posn);
2128                if (retval < 0)
2129                        return posn;
2130                posn += retval;
2131        } while (posn < size);
2132
2133        freq->stream.avail_in = size;
2134        freq->stream.next_in = (void *)ptr;
2135        do {
2136                freq->stream.next_out = expn;
2137                freq->stream.avail_out = sizeof(expn);
2138                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2139                git_SHA1_Update(&freq->c, expn,
2140                                sizeof(expn) - freq->stream.avail_out);
2141        } while (freq->stream.avail_in && freq->zret == Z_OK);
2142        return size;
2143}
2144
2145struct http_object_request *new_http_object_request(const char *base_url,
2146        unsigned char *sha1)
2147{
2148        char *hex = sha1_to_hex(sha1);
2149        const char *filename;
2150        char prevfile[PATH_MAX];
2151        int prevlocal;
2152        char prev_buf[PREV_BUF_SIZE];
2153        ssize_t prev_read = 0;
2154        off_t prev_posn = 0;
2155        struct http_object_request *freq;
2156
2157        freq = xcalloc(1, sizeof(*freq));
2158        hashcpy(freq->sha1, sha1);
2159        freq->localfile = -1;
2160
2161        filename = sha1_file_name(sha1);
2162        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2163                 "%s.temp", filename);
2164
2165        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2166        unlink_or_warn(prevfile);
2167        rename(freq->tmpfile, prevfile);
2168        unlink_or_warn(freq->tmpfile);
2169
2170        if (freq->localfile != -1)
2171                error("fd leakage in start: %d", freq->localfile);
2172        freq->localfile = open(freq->tmpfile,
2173                               O_WRONLY | O_CREAT | O_EXCL, 0666);
2174        /*
2175         * This could have failed due to the "lazy directory creation";
2176         * try to mkdir the last path component.
2177         */
2178        if (freq->localfile < 0 && errno == ENOENT) {
2179                char *dir = strrchr(freq->tmpfile, '/');
2180                if (dir) {
2181                        *dir = 0;
2182                        mkdir(freq->tmpfile, 0777);
2183                        *dir = '/';
2184                }
2185                freq->localfile = open(freq->tmpfile,
2186                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
2187        }
2188
2189        if (freq->localfile < 0) {
2190                error_errno("Couldn't create temporary file %s", freq->tmpfile);
2191                goto abort;
2192        }
2193
2194        git_inflate_init(&freq->stream);
2195
2196        git_SHA1_Init(&freq->c);
2197
2198        freq->url = get_remote_object_url(base_url, hex, 0);
2199
2200        /*
2201         * If a previous temp file is present, process what was already
2202         * fetched.
2203         */
2204        prevlocal = open(prevfile, O_RDONLY);
2205        if (prevlocal != -1) {
2206                do {
2207                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2208                        if (prev_read>0) {
2209                                if (fwrite_sha1_file(prev_buf,
2210                                                     1,
2211                                                     prev_read,
2212                                                     freq) == prev_read) {
2213                                        prev_posn += prev_read;
2214                                } else {
2215                                        prev_read = -1;
2216                                }
2217                        }
2218                } while (prev_read > 0);
2219                close(prevlocal);
2220        }
2221        unlink_or_warn(prevfile);
2222
2223        /*
2224         * Reset inflate/SHA1 if there was an error reading the previous temp
2225         * file; also rewind to the beginning of the local file.
2226         */
2227        if (prev_read == -1) {
2228                memset(&freq->stream, 0, sizeof(freq->stream));
2229                git_inflate_init(&freq->stream);
2230                git_SHA1_Init(&freq->c);
2231                if (prev_posn>0) {
2232                        prev_posn = 0;
2233                        lseek(freq->localfile, 0, SEEK_SET);
2234                        if (ftruncate(freq->localfile, 0) < 0) {
2235                                error_errno("Couldn't truncate temporary file %s",
2236                                            freq->tmpfile);
2237                                goto abort;
2238                        }
2239                }
2240        }
2241
2242        freq->slot = get_active_slot();
2243
2244        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2245        curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2246        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2247        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2248        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2249        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2250
2251        /*
2252         * If we have successfully processed data from a previous fetch
2253         * attempt, only fetch the data we don't already have.
2254         */
2255        if (prev_posn>0) {
2256                if (http_is_verbose)
2257                        fprintf(stderr,
2258                                "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2259                                hex, (uintmax_t)prev_posn);
2260                http_opt_request_remainder(freq->slot->curl, prev_posn);
2261        }
2262
2263        return freq;
2264
2265abort:
2266        free(freq->url);
2267        free(freq);
2268        return NULL;
2269}
2270
2271void process_http_object_request(struct http_object_request *freq)
2272{
2273        if (freq->slot == NULL)
2274                return;
2275        freq->curl_result = freq->slot->curl_result;
2276        freq->http_code = freq->slot->http_code;
2277        freq->slot = NULL;
2278}
2279
2280int finish_http_object_request(struct http_object_request *freq)
2281{
2282        struct stat st;
2283
2284        close(freq->localfile);
2285        freq->localfile = -1;
2286
2287        process_http_object_request(freq);
2288
2289        if (freq->http_code == 416) {
2290                warning("requested range invalid; we may already have all the data.");
2291        } else if (freq->curl_result != CURLE_OK) {
2292                if (stat(freq->tmpfile, &st) == 0)
2293                        if (st.st_size == 0)
2294                                unlink_or_warn(freq->tmpfile);
2295                return -1;
2296        }
2297
2298        git_inflate_end(&freq->stream);
2299        git_SHA1_Final(freq->real_sha1, &freq->c);
2300        if (freq->zret != Z_STREAM_END) {
2301                unlink_or_warn(freq->tmpfile);
2302                return -1;
2303        }
2304        if (hashcmp(freq->sha1, freq->real_sha1)) {
2305                unlink_or_warn(freq->tmpfile);
2306                return -1;
2307        }
2308        freq->rename =
2309                finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2310
2311        return freq->rename;
2312}
2313
2314void abort_http_object_request(struct http_object_request *freq)
2315{
2316        unlink_or_warn(freq->tmpfile);
2317
2318        release_http_object_request(freq);
2319}
2320
2321void release_http_object_request(struct http_object_request *freq)
2322{
2323        if (freq->localfile != -1) {
2324                close(freq->localfile);
2325                freq->localfile = -1;
2326        }
2327        if (freq->url != NULL) {
2328                FREE_AND_NULL(freq->url);
2329        }
2330        if (freq->slot != NULL) {
2331                freq->slot->callback_func = NULL;
2332                freq->slot->callback_data = NULL;
2333                release_active_slot(freq->slot);
2334                freq->slot = NULL;
2335        }
2336}