git.oblomov.eu Git - git/blob - http.c

   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
  19 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
  20 static int trace_curl_data = 1;
  21 static struct string_list cookies_to_redact = STRING_LIST_INIT_DUP;
  22 #if LIBCURL_VERSION_NUM >= 0x070a08
  23 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  24 #else
  25 long int git_curl_ipresolve;
  26 #endif
  27 int active_requests;
  28 int http_is_verbose;
  29 ssize_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
  35 static int min_curl_sessions = 1;
  36 static int curl_session_count;
  37 #ifdef USE_CURL_MULTI
  38 static int max_requests = -1;
  39 static CURLM *curlm;
  40 #endif
  41 #ifndef NO_CURL_EASY_DUPHANDLE
  42 static CURL *curl_default;
  43 #endif
  44
  45 #define PREV_BUF_SIZE 4096
  46
  47 char curl_errorstr[CURL_ERROR_SIZE];
  48
  49 static int curl_ssl_verify = -1;
  50 static int curl_ssl_try;
  51 static const char *curl_http_version = NULL;
  52 static const char *ssl_cert;
  53 static const char *ssl_cipherlist;
  54 static const char *ssl_version;
  55 static 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
  72 static const char *ssl_key;
  73 #endif
  74 #if LIBCURL_VERSION_NUM >= 0x070908
  75 static const char *ssl_capath;
  76 #endif
  77 #if LIBCURL_VERSION_NUM >= 0x071304
  78 static const char *curl_no_proxy;
  79 #endif
  80 #if LIBCURL_VERSION_NUM >= 0x072c00
  81 static const char *ssl_pinnedkey;
  82 #endif
  83 static const char *ssl_cainfo;
  84 static long curl_low_speed_limit = -1;
  85 static long curl_low_speed_time = -1;
  86 static int curl_ftp_no_epsv;
  87 static const char *curl_http_proxy;
  88 static const char *http_proxy_authmethod;
  89
  90 static const char *http_proxy_ssl_cert;
  91 static const char *http_proxy_ssl_key;
  92 static const char *http_proxy_ssl_ca_info;
  93 static struct credential proxy_cert_auth = CREDENTIAL_INIT;
  94 static int proxy_ssl_cert_password_required;
  95
  96 static struct {
  97         const char *name;
  98         long curlauth_param;
  99 } proxy_authmethods[] = {
 100         { "basic", CURLAUTH_BASIC },
 101         { "digest", CURLAUTH_DIGEST },
 102         { "negotiate", CURLAUTH_GSSNEGOTIATE },
 103         { "ntlm", CURLAUTH_NTLM },
 104 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 105         { "anyauth", CURLAUTH_ANY },
 106 #endif
 107         /*
 108          * CURLAUTH_DIGEST_IE has no corresponding command-line option in
 109          * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
 110          * here, too
 111          */
 112 };
 113 #ifdef CURLGSSAPI_DELEGATION_FLAG
 114 static const char *curl_deleg;
 115 static struct {
 116         const char *name;
 117         long curl_deleg_param;
 118 } curl_deleg_levels[] = {
 119         { "none", CURLGSSAPI_DELEGATION_NONE },
 120         { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
 121         { "always", CURLGSSAPI_DELEGATION_FLAG },
 122 };
 123 #endif
 124
 125 static struct credential proxy_auth = CREDENTIAL_INIT;
 126 static const char *curl_proxyuserpwd;
 127 static const char *curl_cookie_file;
 128 static int curl_save_cookies;
 129 struct credential http_auth = CREDENTIAL_INIT;
 130 static int http_proactive_auth;
 131 static const char *user_agent;
 132 static int curl_empty_auth = -1;
 133
 134 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
 135
 136 #if LIBCURL_VERSION_NUM >= 0x071700
 137 /* Use CURLOPT_KEYPASSWD as is */
 138 #elif LIBCURL_VERSION_NUM >= 0x070903
 139 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 140 #else
 141 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 142 #endif
 143
 144 static struct credential cert_auth = CREDENTIAL_INIT;
 145 static int ssl_cert_password_required;
 146 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 147 static unsigned long http_auth_methods = CURLAUTH_ANY;
 148 static int http_auth_methods_restricted;
 149 /* Modes for which empty_auth cannot actually help us. */
 150 static unsigned long empty_auth_useless =
 151         CURLAUTH_BASIC
 152 #ifdef CURLAUTH_DIGEST_IE
 153         | CURLAUTH_DIGEST_IE
 154 #endif
 155         | CURLAUTH_DIGEST;
 156 #endif
 157
 158 static struct curl_slist *pragma_header;
 159 static struct curl_slist *no_pragma_header;
 160 static struct string_list extra_http_headers = STRING_LIST_INIT_DUP;
 161
 162 static struct active_request_slot *active_queue_head;
 163
 164 static char *cached_accept_language;
 165
 166 static char *http_ssl_backend;
 167
 168 static int http_schannel_check_revoke = 1;
 169 /*
 170  * With the backend being set to `schannel`, setting sslCAinfo would override
 171  * the Certificate Store in cURL v7.60.0 and later, which is not what we want
 172  * by default.
 173  */
 174 static int http_schannel_use_ssl_cainfo;
 175
 176 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 177 {
 178         size_t size = eltsize * nmemb;
 179         struct buffer *buffer = buffer_;
 180
 181         if (size > buffer->buf.len - buffer->posn)
 182                 size = buffer->buf.len - buffer->posn;
 183         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 184         buffer->posn += size;
 185
 186         return size / eltsize;
 187 }
 188
 189 #ifndef NO_CURL_IOCTL
 190 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 191 {
 192         struct buffer *buffer = clientp;
 193
 194         switch (cmd) {
 195         case CURLIOCMD_NOP:
 196                 return CURLIOE_OK;
 197
 198         case CURLIOCMD_RESTARTREAD:
 199                 buffer->posn = 0;
 200                 return CURLIOE_OK;
 201
 202         default:
 203                 return CURLIOE_UNKNOWNCMD;
 204         }
 205 }
 206 #endif
 207
 208 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 209 {
 210         size_t size = eltsize * nmemb;
 211         struct strbuf *buffer = buffer_;
 212
 213         strbuf_add(buffer, ptr, size);
 214         return nmemb;
 215 }
 216
 217 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 218 {
 219         return nmemb;
 220 }
 221
 222 static void closedown_active_slot(struct active_request_slot *slot)
 223 {
 224         active_requests--;
 225         slot->in_use = 0;
 226 }
 227
 228 static void finish_active_slot(struct active_request_slot *slot)
 229 {
 230         closedown_active_slot(slot);
 231         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 232
 233         if (slot->finished != NULL)
 234                 (*slot->finished) = 1;
 235
 236         /* Store slot results so they can be read after the slot is reused */
 237         if (slot->results != NULL) {
 238                 slot->results->curl_result = slot->curl_result;
 239                 slot->results->http_code = slot->http_code;
 240 #if LIBCURL_VERSION_NUM >= 0x070a08
 241                 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 242                                   &slot->results->auth_avail);
 243 #else
 244                 slot->results->auth_avail = 0;
 245 #endif
 246
 247                 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 248                         &slot->results->http_connectcode);
 249         }
 250
 251         /* Run callback if appropriate */
 252         if (slot->callback_func != NULL)
 253                 slot->callback_func(slot->callback_data);
 254 }
 255
 256 static void xmulti_remove_handle(struct active_request_slot *slot)
 257 {
 258 #ifdef USE_CURL_MULTI
 259         curl_multi_remove_handle(curlm, slot->curl);
 260 #endif
 261 }
 262
 263 #ifdef USE_CURL_MULTI
 264 static void process_curl_messages(void)
 265 {
 266         int num_messages;
 267         struct active_request_slot *slot;
 268         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 269
 270         while (curl_message != NULL) {
 271                 if (curl_message->msg == CURLMSG_DONE) {
 272                         int curl_result = curl_message->data.result;
 273                         slot = active_queue_head;
 274                         while (slot != NULL &&
 275                                slot->curl != curl_message->easy_handle)
 276                                 slot = slot->next;
 277                         if (slot != NULL) {
 278                                 xmulti_remove_handle(slot);
 279                                 slot->curl_result = curl_result;
 280                                 finish_active_slot(slot);
 281                         } else {
 282                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 283                         }
 284                 } else {
 285                         fprintf(stderr, "Unknown CURL message received: %d\n",
 286                                 (int)curl_message->msg);
 287                 }
 288                 curl_message = curl_multi_info_read(curlm, &num_messages);
 289         }
 290 }
 291 #endif
 292
 293 static int http_options(const char *var, const char *value, void *cb)
 294 {
 295         if (!strcmp("http.version", var)) {
 296                 return git_config_string(&curl_http_version, var, value);
 297         }
 298         if (!strcmp("http.sslverify", var)) {
 299                 curl_ssl_verify = git_config_bool(var, value);
 300                 return 0;
 301         }
 302         if (!strcmp("http.sslcipherlist", var))
 303                 return git_config_string(&ssl_cipherlist, var, value);
 304         if (!strcmp("http.sslversion", var))
 305                 return git_config_string(&ssl_version, var, value);
 306         if (!strcmp("http.sslcert", var))
 307                 return git_config_pathname(&ssl_cert, var, value);
 308 #if LIBCURL_VERSION_NUM >= 0x070903
 309         if (!strcmp("http.sslkey", var))
 310                 return git_config_pathname(&ssl_key, var, value);
 311 #endif
 312 #if LIBCURL_VERSION_NUM >= 0x070908
 313         if (!strcmp("http.sslcapath", var))
 314                 return git_config_pathname(&ssl_capath, var, value);
 315 #endif
 316         if (!strcmp("http.sslcainfo", var))
 317                 return git_config_pathname(&ssl_cainfo, var, value);
 318         if (!strcmp("http.sslcertpasswordprotected", var)) {
 319                 ssl_cert_password_required = git_config_bool(var, value);
 320                 return 0;
 321         }
 322         if (!strcmp("http.ssltry", var)) {
 323                 curl_ssl_try = git_config_bool(var, value);
 324                 return 0;
 325         }
 326         if (!strcmp("http.sslbackend", var)) {
 327                 free(http_ssl_backend);
 328                 http_ssl_backend = xstrdup_or_null(value);
 329                 return 0;
 330         }
 331
 332         if (!strcmp("http.schannelcheckrevoke", var)) {
 333                 http_schannel_check_revoke = git_config_bool(var, value);
 334                 return 0;
 335         }
 336
 337         if (!strcmp("http.schannelusesslcainfo", var)) {
 338                 http_schannel_use_ssl_cainfo = git_config_bool(var, value);
 339                 return 0;
 340         }
 341
 342         if (!strcmp("http.minsessions", var)) {
 343                 min_curl_sessions = git_config_int(var, value);
 344 #ifndef USE_CURL_MULTI
 345                 if (min_curl_sessions > 1)
 346                         min_curl_sessions = 1;
 347 #endif
 348                 return 0;
 349         }
 350 #ifdef USE_CURL_MULTI
 351         if (!strcmp("http.maxrequests", var)) {
 352                 max_requests = git_config_int(var, value);
 353                 return 0;
 354         }
 355 #endif
 356         if (!strcmp("http.lowspeedlimit", var)) {
 357                 curl_low_speed_limit = (long)git_config_int(var, value);
 358                 return 0;
 359         }
 360         if (!strcmp("http.lowspeedtime", var)) {
 361                 curl_low_speed_time = (long)git_config_int(var, value);
 362                 return 0;
 363         }
 364
 365         if (!strcmp("http.noepsv", var)) {
 366                 curl_ftp_no_epsv = git_config_bool(var, value);
 367                 return 0;
 368         }
 369         if (!strcmp("http.proxy", var))
 370                 return git_config_string(&curl_http_proxy, var, value);
 371
 372         if (!strcmp("http.proxyauthmethod", var))
 373                 return git_config_string(&http_proxy_authmethod, var, value);
 374
 375         if (!strcmp("http.proxysslcert", var))
 376                 return git_config_string(&http_proxy_ssl_cert, var, value);
 377
 378         if (!strcmp("http.proxysslkey", var))
 379                 return git_config_string(&http_proxy_ssl_key, var, value);
 380
 381         if (!strcmp("http.proxysslcainfo", var))
 382                 return git_config_string(&http_proxy_ssl_ca_info, var, value);
 383
 384         if (!strcmp("http.proxysslcertpasswordprotected", var)) {
 385                 proxy_ssl_cert_password_required = git_config_bool(var, value);
 386                 return 0;
 387         }
 388
 389         if (!strcmp("http.cookiefile", var))
 390                 return git_config_pathname(&curl_cookie_file, var, value);
 391         if (!strcmp("http.savecookies", var)) {
 392                 curl_save_cookies = git_config_bool(var, value);
 393                 return 0;
 394         }
 395
 396         if (!strcmp("http.postbuffer", var)) {
 397                 http_post_buffer = git_config_ssize_t(var, value);
 398                 if (http_post_buffer < 0)
 399                         warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
 400                 if (http_post_buffer < LARGE_PACKET_MAX)
 401                         http_post_buffer = LARGE_PACKET_MAX;
 402                 return 0;
 403         }
 404
 405         if (!strcmp("http.useragent", var))
 406                 return git_config_string(&user_agent, var, value);
 407
 408         if (!strcmp("http.emptyauth", var)) {
 409                 if (value && !strcmp("auto", value))
 410                         curl_empty_auth = -1;
 411                 else
 412                         curl_empty_auth = git_config_bool(var, value);
 413                 return 0;
 414         }
 415
 416         if (!strcmp("http.delegation", var)) {
 417 #ifdef CURLGSSAPI_DELEGATION_FLAG
 418                 return git_config_string(&curl_deleg, var, value);
 419 #else
 420                 warning(_("Delegation control is not supported with cURL < 7.22.0"));
 421                 return 0;
 422 #endif
 423         }
 424
 425         if (!strcmp("http.pinnedpubkey", var)) {
 426 #if LIBCURL_VERSION_NUM >= 0x072c00
 427                 return git_config_pathname(&ssl_pinnedkey, var, value);
 428 #else
 429                 warning(_("Public key pinning not supported with cURL < 7.44.0"));
 430                 return 0;
 431 #endif
 432         }
 433
 434         if (!strcmp("http.extraheader", var)) {
 435                 if (!value) {
 436                         return config_error_nonbool(var);
 437                 } else if (!*value) {
 438                         string_list_clear(&extra_http_headers, 0);
 439                 } else {
 440                         string_list_append(&extra_http_headers, value);
 441                 }
 442                 return 0;
 443         }
 444
 445         if (!strcmp("http.followredirects", var)) {
 446                 if (value && !strcmp(value, "initial"))
 447                         http_follow_config = HTTP_FOLLOW_INITIAL;
 448                 else if (git_config_bool(var, value))
 449                         http_follow_config = HTTP_FOLLOW_ALWAYS;
 450                 else
 451                         http_follow_config = HTTP_FOLLOW_NONE;
 452                 return 0;
 453         }
 454
 455         /* Fall back on the default ones */
 456         return git_default_config(var, value, cb);
 457 }
 458
 459 static int curl_empty_auth_enabled(void)
 460 {
 461         if (curl_empty_auth >= 0)
 462                 return curl_empty_auth;
 463
 464 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
 465         /*
 466          * Our libcurl is too old to do AUTH_ANY in the first place;
 467          * just default to turning the feature off.
 468          */
 469 #else
 470         /*
 471          * In the automatic case, kick in the empty-auth
 472          * hack as long as we would potentially try some
 473          * method more exotic than "Basic" or "Digest".
 474          *
 475          * But only do this when this is our second or
 476          * subsequent request, as by then we know what
 477          * methods are available.
 478          */
 479         if (http_auth_methods_restricted &&
 480             (http_auth_methods & ~empty_auth_useless))
 481                 return 1;
 482 #endif
 483         return 0;
 484 }
 485
 486 static void init_curl_http_auth(CURL *result)
 487 {
 488         if (!http_auth.username || !*http_auth.username) {
 489                 if (curl_empty_auth_enabled())
 490                         curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 491                 return;
 492         }
 493
 494         credential_fill(&http_auth);
 495
 496 #if LIBCURL_VERSION_NUM >= 0x071301
 497         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 498         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 499 #else
 500         {
 501                 static struct strbuf up = STRBUF_INIT;
 502                 /*
 503                  * Note that we assume we only ever have a single set of
 504                  * credentials in a given program run, so we do not have
 505                  * to worry about updating this buffer, only setting its
 506                  * initial value.
 507                  */
 508                 if (!up.len)
 509                         strbuf_addf(&up, "%s:%s",
 510                                 http_auth.username, http_auth.password);
 511                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 512         }
 513 #endif
 514 }
 515
 516 /* *var must be free-able */
 517 static void var_override(const char **var, char *value)
 518 {
 519         if (value) {
 520                 free((void *)*var);
 521                 *var = xstrdup(value);
 522         }
 523 }
 524
 525 static void set_proxyauth_name_password(CURL *result)
 526 {
 527 #if LIBCURL_VERSION_NUM >= 0x071301
 528                 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 529                         proxy_auth.username);
 530                 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 531                         proxy_auth.password);
 532 #else
 533                 struct strbuf s = STRBUF_INIT;
 534
 535                 strbuf_addstr_urlencode(&s, proxy_auth.username,
 536                                         is_rfc3986_unreserved);
 537                 strbuf_addch(&s, ':');
 538                 strbuf_addstr_urlencode(&s, proxy_auth.password,
 539                                         is_rfc3986_unreserved);
 540                 curl_proxyuserpwd = strbuf_detach(&s, NULL);
 541                 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 542 #endif
 543 }
 544
 545 static void init_curl_proxy_auth(CURL *result)
 546 {
 547         if (proxy_auth.username) {
 548                 if (!proxy_auth.password)
 549                         credential_fill(&proxy_auth);
 550                 set_proxyauth_name_password(result);
 551         }
 552
 553         var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 554
 555 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 556         if (http_proxy_authmethod) {
 557                 int i;
 558                 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 559                         if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 560                                 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 561                                                 proxy_authmethods[i].curlauth_param);
 562                                 break;
 563                         }
 564                 }
 565                 if (i == ARRAY_SIZE(proxy_authmethods)) {
 566                         warning("unsupported proxy authentication method %s: using anyauth",
 567                                         http_proxy_authmethod);
 568                         curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 569                 }
 570         }
 571         else
 572                 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 573 #endif
 574 }
 575
 576 static int has_cert_password(void)
 577 {
 578         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 579                 return 0;
 580         if (!cert_auth.password) {
 581                 cert_auth.protocol = xstrdup("cert");
 582                 cert_auth.host = xstrdup("");
 583                 cert_auth.username = xstrdup("");
 584                 cert_auth.path = xstrdup(ssl_cert);
 585                 credential_fill(&cert_auth);
 586         }
 587         return 1;
 588 }
 589
 590 #if LIBCURL_VERSION_NUM >= 0x073400
 591 static int has_proxy_cert_password(void)
 592 {
 593         if (http_proxy_ssl_cert == NULL || proxy_ssl_cert_password_required != 1)
 594                 return 0;
 595         if (!proxy_cert_auth.password) {
 596                 proxy_cert_auth.protocol = xstrdup("cert");
 597                 proxy_cert_auth.host = xstrdup("");
 598                 proxy_cert_auth.username = xstrdup("");
 599                 proxy_cert_auth.path = xstrdup(http_proxy_ssl_cert);
 600                 credential_fill(&proxy_cert_auth);
 601         }
 602         return 1;
 603 }
 604 #endif
 605
 606 #if LIBCURL_VERSION_NUM >= 0x071900
 607 static void set_curl_keepalive(CURL *c)
 608 {
 609         curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 610 }
 611
 612 #elif LIBCURL_VERSION_NUM >= 0x071000
 613 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 614 {
 615         int ka = 1;
 616         int rc;
 617         socklen_t len = (socklen_t)sizeof(ka);
 618
 619         if (type != CURLSOCKTYPE_IPCXN)
 620                 return 0;
 621
 622         rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 623         if (rc < 0)
 624                 warning_errno("unable to set SO_KEEPALIVE on socket");
 625
 626         return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 627 }
 628
 629 static void set_curl_keepalive(CURL *c)
 630 {
 631         curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 632 }
 633
 634 #else
 635 static void set_curl_keepalive(CURL *c)
 636 {
 637         /* not supported on older curl versions */
 638 }
 639 #endif
 640
 641 static void redact_sensitive_header(struct strbuf *header)
 642 {
 643         const char *sensitive_header;
 644
 645         if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 646             skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 647                 /* The first token is the type, which is OK to log */
 648                 while (isspace(*sensitive_header))
 649                         sensitive_header++;
 650                 while (*sensitive_header && !isspace(*sensitive_header))
 651                         sensitive_header++;
 652                 /* Everything else is opaque and possibly sensitive */
 653                 strbuf_setlen(header,  sensitive_header - header->buf);
 654                 strbuf_addstr(header, " <redacted>");
 655         } else if (cookies_to_redact.nr &&
 656                    skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
 657                 struct strbuf redacted_header = STRBUF_INIT;
 658                 char *cookie;
 659
 660                 while (isspace(*sensitive_header))
 661                         sensitive_header++;
 662
 663                 /*
 664                  * The contents of header starting from sensitive_header will
 665                  * subsequently be overridden, so it is fine to mutate this
 666                  * string (hence the assignment to "char *").
 667                  */
 668                 cookie = (char *) sensitive_header;
 669
 670                 while (cookie) {
 671                         char *equals;
 672                         char *semicolon = strstr(cookie, "; ");
 673                         if (semicolon)
 674                                 *semicolon = 0;
 675                         equals = strchrnul(cookie, '=');
 676                         if (!equals) {
 677                                 /* invalid cookie, just append and continue */
 678                                 strbuf_addstr(&redacted_header, cookie);
 679                                 continue;
 680                         }
 681                         *equals = 0; /* temporarily set to NUL for lookup */
 682                         if (string_list_lookup(&cookies_to_redact, cookie)) {
 683                                 strbuf_addstr(&redacted_header, cookie);
 684                                 strbuf_addstr(&redacted_header, "=<redacted>");
 685                         } else {
 686                                 *equals = '=';
 687                                 strbuf_addstr(&redacted_header, cookie);
 688                         }
 689                         if (semicolon) {
 690                                 /*
 691                                  * There are more cookies. (Or, for some
 692                                  * reason, the input string ends in "; ".)
 693                                  */
 694                                 strbuf_addstr(&redacted_header, "; ");
 695                                 cookie = semicolon + strlen("; ");
 696                         } else {
 697                                 cookie = NULL;
 698                         }
 699                 }
 700
 701                 strbuf_setlen(header, sensitive_header - header->buf);
 702                 strbuf_addbuf(header, &redacted_header);
 703         }
 704 }
 705
 706 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 707 {
 708         struct strbuf out = STRBUF_INIT;
 709         struct strbuf **headers, **header;
 710
 711         strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 712                 text, (long)size, (long)size);
 713         trace_strbuf(&trace_curl, &out);
 714         strbuf_reset(&out);
 715         strbuf_add(&out, ptr, size);
 716         headers = strbuf_split_max(&out, '\n', 0);
 717
 718         for (header = headers; *header; header++) {
 719                 if (hide_sensitive_header)
 720                         redact_sensitive_header(*header);
 721                 strbuf_insertstr((*header), 0, text);
 722                 strbuf_insertstr((*header), strlen(text), ": ");
 723                 strbuf_rtrim((*header));
 724                 strbuf_addch((*header), '\n');
 725                 trace_strbuf(&trace_curl, (*header));
 726         }
 727         strbuf_list_free(headers);
 728         strbuf_release(&out);
 729 }
 730
 731 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 732 {
 733         size_t i;
 734         struct strbuf out = STRBUF_INIT;
 735         unsigned int width = 60;
 736
 737         strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 738                 text, (long)size, (long)size);
 739         trace_strbuf(&trace_curl, &out);
 740
 741         for (i = 0; i < size; i += width) {
 742                 size_t w;
 743
 744                 strbuf_reset(&out);
 745                 strbuf_addf(&out, "%s: ", text);
 746                 for (w = 0; (w < width) && (i + w < size); w++) {
 747                         unsigned char ch = ptr[i + w];
 748
 749                         strbuf_addch(&out,
 750                                        (ch >= 0x20) && (ch < 0x80)
 751                                        ? ch : '.');
 752                 }
 753                 strbuf_addch(&out, '\n');
 754                 trace_strbuf(&trace_curl, &out);
 755         }
 756         strbuf_release(&out);
 757 }
 758
 759 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 760 {
 761         const char *text;
 762         enum { NO_FILTER = 0, DO_FILTER = 1 };
 763
 764         switch (type) {
 765         case CURLINFO_TEXT:
 766                 trace_printf_key(&trace_curl, "== Info: %s", data);
 767                 break;
 768         case CURLINFO_HEADER_OUT:
 769                 text = "=> Send header";
 770                 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 771                 break;
 772         case CURLINFO_DATA_OUT:
 773                 if (trace_curl_data) {
 774                         text = "=> Send data";
 775                         curl_dump_data(text, (unsigned char *)data, size);
 776                 }
 777                 break;
 778         case CURLINFO_SSL_DATA_OUT:
 779                 if (trace_curl_data) {
 780                         text = "=> Send SSL data";
 781                         curl_dump_data(text, (unsigned char *)data, size);
 782                 }
 783                 break;
 784         case CURLINFO_HEADER_IN:
 785                 text = "<= Recv header";
 786                 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 787                 break;
 788         case CURLINFO_DATA_IN:
 789                 if (trace_curl_data) {
 790                         text = "<= Recv data";
 791                         curl_dump_data(text, (unsigned char *)data, size);
 792                 }
 793                 break;
 794         case CURLINFO_SSL_DATA_IN:
 795                 if (trace_curl_data) {
 796                         text = "<= Recv SSL data";
 797                         curl_dump_data(text, (unsigned char *)data, size);
 798                 }
 799                 break;
 800
 801         default:                /* we ignore unknown types by default */
 802                 return 0;
 803         }
 804         return 0;
 805 }
 806
 807 void http_trace_curl_no_data(void)
 808 {
 809         trace_override_envvar(&trace_curl, "1");
 810         trace_curl_data = 0;
 811 }
 812
 813 void setup_curl_trace(CURL *handle)
 814 {
 815         if (!trace_want(&trace_curl))
 816                 return;
 817         curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 818         curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 819         curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 820 }
 821
 822 #ifdef CURLPROTO_HTTP
 823 static long get_curl_allowed_protocols(int from_user)
 824 {
 825         long allowed_protocols = 0;
 826
 827         if (is_transport_allowed("http", from_user))
 828                 allowed_protocols |= CURLPROTO_HTTP;
 829         if (is_transport_allowed("https", from_user))
 830                 allowed_protocols |= CURLPROTO_HTTPS;
 831         if (is_transport_allowed("ftp", from_user))
 832                 allowed_protocols |= CURLPROTO_FTP;
 833         if (is_transport_allowed("ftps", from_user))
 834                 allowed_protocols |= CURLPROTO_FTPS;
 835
 836         return allowed_protocols;
 837 }
 838 #endif
 839
 840 #if LIBCURL_VERSION_NUM >=0x072f00
 841 static int get_curl_http_version_opt(const char *version_string, long *opt)
 842 {
 843         int i;
 844         static struct {
 845                 const char *name;
 846                 long opt_token;
 847         } choice[] = {
 848                 { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
 849                 { "HTTP/2", CURL_HTTP_VERSION_2 }
 850         };
 851
 852         for (i = 0; i < ARRAY_SIZE(choice); i++) {
 853                 if (!strcmp(version_string, choice[i].name)) {
 854                         *opt = choice[i].opt_token;
 855                         return 0;
 856                 }
 857         }
 858
 859         warning("unknown value given to http.version: '%s'", version_string);
 860         return -1; /* not found */
 861 }
 862
 863 #endif
 864
 865 static CURL *get_curl_handle(void)
 866 {
 867         CURL *result = curl_easy_init();
 868
 869         if (!result)
 870                 die("curl_easy_init failed");
 871
 872         if (!curl_ssl_verify) {
 873                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 874                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 875         } else {
 876                 /* Verify authenticity of the peer's certificate */
 877                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 878                 /* The name in the cert must match whom we tried to connect */
 879                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 880         }
 881
 882 #if LIBCURL_VERSION_NUM >= 0x072f00 // 7.47.0
 883     if (curl_http_version) {
 884                 long opt;
 885                 if (!get_curl_http_version_opt(curl_http_version, &opt)) {
 886                         /* Set request use http version */
 887                         curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
 888                 }
 889     }
 890 #endif
 891
 892 #if LIBCURL_VERSION_NUM >= 0x070907
 893         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 894 #endif
 895 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 896         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 897 #endif
 898
 899 #ifdef CURLGSSAPI_DELEGATION_FLAG
 900         if (curl_deleg) {
 901                 int i;
 902                 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
 903                         if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
 904                                 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
 905                                                 curl_deleg_levels[i].curl_deleg_param);
 906                                 break;
 907                         }
 908                 }
 909                 if (i == ARRAY_SIZE(curl_deleg_levels))
 910                         warning("Unknown delegation method '%s': using default",
 911                                 curl_deleg);
 912         }
 913 #endif
 914
 915         if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
 916             !http_schannel_check_revoke) {
 917 #if LIBCURL_VERSION_NUM >= 0x072c00
 918                 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
 919 #else
 920                 warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
 921 #endif
 922         }
 923
 924         if (http_proactive_auth)
 925                 init_curl_http_auth(result);
 926
 927         if (getenv("GIT_SSL_VERSION"))
 928                 ssl_version = getenv("GIT_SSL_VERSION");
 929         if (ssl_version && *ssl_version) {
 930                 int i;
 931                 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 932                         if (!strcmp(ssl_version, sslversions[i].name)) {
 933                                 curl_easy_setopt(result, CURLOPT_SSLVERSION,
 934                                                  sslversions[i].ssl_version);
 935                                 break;
 936                         }
 937                 }
 938                 if (i == ARRAY_SIZE(sslversions))
 939                         warning("unsupported ssl version %s: using default",
 940                                 ssl_version);
 941         }
 942
 943         if (getenv("GIT_SSL_CIPHER_LIST"))
 944                 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 945         if (ssl_cipherlist != NULL && *ssl_cipherlist)
 946                 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 947                                 ssl_cipherlist);
 948
 949         if (ssl_cert != NULL)
 950                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 951         if (has_cert_password())
 952                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 953 #if LIBCURL_VERSION_NUM >= 0x070903
 954         if (ssl_key != NULL)
 955                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 956 #endif
 957 #if LIBCURL_VERSION_NUM >= 0x070908
 958         if (ssl_capath != NULL)
 959                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 960 #endif
 961 #if LIBCURL_VERSION_NUM >= 0x072c00
 962         if (ssl_pinnedkey != NULL)
 963                 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 964 #endif
 965         if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
 966             !http_schannel_use_ssl_cainfo) {
 967                 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
 968 #if LIBCURL_VERSION_NUM >= 0x073400
 969                 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
 970 #endif
 971         } else if (ssl_cainfo != NULL || http_proxy_ssl_ca_info != NULL) {
 972                 if (ssl_cainfo != NULL)
 973                         curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 974 #if LIBCURL_VERSION_NUM >= 0x073400
 975                 if (http_proxy_ssl_ca_info != NULL)
 976                         curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, http_proxy_ssl_ca_info);
 977 #endif
 978         }
 979
 980         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 981                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 982                                  curl_low_speed_limit);
 983                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 984                                  curl_low_speed_time);
 985         }
 986
 987         curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 988 #if LIBCURL_VERSION_NUM >= 0x071301
 989         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 990 #elif LIBCURL_VERSION_NUM >= 0x071101
 991         curl_easy_setopt(result, CURLOPT_POST301, 1);
 992 #endif
 993 #ifdef CURLPROTO_HTTP
 994         curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
 995                          get_curl_allowed_protocols(0));
 996         curl_easy_setopt(result, CURLOPT_PROTOCOLS,
 997                          get_curl_allowed_protocols(-1));
 998 #else
 999         warning(_("Protocol restrictions not supported with cURL < 7.19.4"));
1000 #endif
1001         if (getenv("GIT_CURL_VERBOSE"))
1002                 http_trace_curl_no_data();
1003         setup_curl_trace(result);
1004         if (getenv("GIT_TRACE_CURL_NO_DATA"))
1005                 trace_curl_data = 0;
1006         if (getenv("GIT_REDACT_COOKIES")) {
1007                 string_list_split(&cookies_to_redact,
1008                                   getenv("GIT_REDACT_COOKIES"), ',', -1);
1009                 string_list_sort(&cookies_to_redact);
1010         }
1011
1012         curl_easy_setopt(result, CURLOPT_USERAGENT,
1013                 user_agent ? user_agent : git_user_agent());
1014
1015         if (curl_ftp_no_epsv)
1016                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
1017
1018 #ifdef CURLOPT_USE_SSL
1019         if (curl_ssl_try)
1020                 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
1021 #endif
1022
1023         /*
1024          * CURL also examines these variables as a fallback; but we need to query
1025          * them here in order to decide whether to prompt for missing password (cf.
1026          * init_curl_proxy_auth()).
1027          *
1028          * Unlike many other common environment variables, these are historically
1029          * lowercase only. It appears that CURL did not know this and implemented
1030          * only uppercase variants, which was later corrected to take both - with
1031          * the exception of http_proxy, which is lowercase only also in CURL. As
1032          * the lowercase versions are the historical quasi-standard, they take
1033          * precedence here, as in CURL.
1034          */
1035         if (!curl_http_proxy) {
1036                 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
1037                         var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
1038                         var_override(&curl_http_proxy, getenv("https_proxy"));
1039                 } else {
1040                         var_override(&curl_http_proxy, getenv("http_proxy"));
1041                 }
1042                 if (!curl_http_proxy) {
1043                         var_override(&curl_http_proxy, getenv("ALL_PROXY"));
1044                         var_override(&curl_http_proxy, getenv("all_proxy"));
1045                 }
1046         }
1047
1048         if (curl_http_proxy && curl_http_proxy[0] == '\0') {
1049                 /*
1050                  * Handle case with the empty http.proxy value here to keep
1051                  * common code clean.
1052                  * NB: empty option disables proxying at all.
1053                  */
1054                 curl_easy_setopt(result, CURLOPT_PROXY, "");
1055         } else if (curl_http_proxy) {
1056 #if LIBCURL_VERSION_NUM >= 0x071800
1057                 if (starts_with(curl_http_proxy, "socks5h"))
1058                         curl_easy_setopt(result,
1059                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
1060                 else if (starts_with(curl_http_proxy, "socks5"))
1061                         curl_easy_setopt(result,
1062                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
1063                 else if (starts_with(curl_http_proxy, "socks4a"))
1064                         curl_easy_setopt(result,
1065                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
1066                 else if (starts_with(curl_http_proxy, "socks"))
1067                         curl_easy_setopt(result,
1068                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
1069 #endif
1070 #if LIBCURL_VERSION_NUM >= 0x073400
1071                 else if (starts_with(curl_http_proxy, "https")) {
1072                         curl_easy_setopt(result, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
1073
1074                         if (http_proxy_ssl_cert)
1075                                 curl_easy_setopt(result, CURLOPT_PROXY_SSLCERT, http_proxy_ssl_cert);
1076
1077                         if (http_proxy_ssl_key)
1078                                 curl_easy_setopt(result, CURLOPT_PROXY_SSLKEY, http_proxy_ssl_key);
1079
1080                         if (has_proxy_cert_password())
1081                                 curl_easy_setopt(result, CURLOPT_PROXY_KEYPASSWD, proxy_cert_auth.password);
1082                 }
1083 #endif
1084                 if (strstr(curl_http_proxy, "://"))
1085                         credential_from_url(&proxy_auth, curl_http_proxy);
1086                 else {
1087                         struct strbuf url = STRBUF_INIT;
1088                         strbuf_addf(&url, "http://%s", curl_http_proxy);
1089                         credential_from_url(&proxy_auth, url.buf);
1090                         strbuf_release(&url);
1091                 }
1092
1093                 if (!proxy_auth.host)
1094                         die("Invalid proxy URL '%s'", curl_http_proxy);
1095
1096                 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
1097 #if LIBCURL_VERSION_NUM >= 0x071304
1098                 var_override(&curl_no_proxy, getenv("NO_PROXY"));
1099                 var_override(&curl_no_proxy, getenv("no_proxy"));
1100                 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
1101 #endif
1102         }
1103         init_curl_proxy_auth(result);
1104
1105         set_curl_keepalive(result);
1106
1107         return result;
1108 }
1109
1110 static void set_from_env(const char **var, const char *envname)
1111 {
1112         const char *val = getenv(envname);
1113         if (val)
1114                 *var = val;
1115 }
1116
1117 void http_init(struct remote *remote, const char *url, int proactive_auth)
1118 {
1119         char *low_speed_limit;
1120         char *low_speed_time;
1121         char *normalized_url;
1122         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
1123
1124         config.section = "http";
1125         config.key = NULL;
1126         config.collect_fn = http_options;
1127         config.cascade_fn = git_default_config;
1128         config.cb = NULL;
1129
1130         http_is_verbose = 0;
1131         normalized_url = url_normalize(url, &config.url);
1132
1133         git_config(urlmatch_config_entry, &config);
1134         free(normalized_url);
1135         string_list_clear(&config.vars, 1);
1136
1137 #if LIBCURL_VERSION_NUM >= 0x073800
1138         if (http_ssl_backend) {
1139                 const curl_ssl_backend **backends;
1140                 struct strbuf buf = STRBUF_INIT;
1141                 int i;
1142
1143                 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1144                 case CURLSSLSET_UNKNOWN_BACKEND:
1145                         strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1146                                             "Supported SSL backends:"),
1147                                             http_ssl_backend);
1148                         for (i = 0; backends[i]; i++)
1149                                 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1150                         die("%s", buf.buf);
1151                 case CURLSSLSET_NO_BACKENDS:
1152                         die(_("Could not set SSL backend to '%s': "
1153                               "cURL was built without SSL backends"),
1154                             http_ssl_backend);
1155                 case CURLSSLSET_TOO_LATE:
1156                         die(_("Could not set SSL backend to '%s': already set"),
1157                             http_ssl_backend);
1158                 case CURLSSLSET_OK:
1159                         break; /* Okay! */
1160                 }
1161         }
1162 #endif
1163
1164         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1165                 die("curl_global_init failed");
1166
1167         http_proactive_auth = proactive_auth;
1168
1169         if (remote && remote->http_proxy)
1170                 curl_http_proxy = xstrdup(remote->http_proxy);
1171
1172         if (remote)
1173                 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1174
1175         pragma_header = curl_slist_append(http_copy_default_headers(),
1176                 "Pragma: no-cache");
1177         no_pragma_header = curl_slist_append(http_copy_default_headers(),
1178                 "Pragma:");
1179
1180 #ifdef USE_CURL_MULTI
1181         {
1182                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1183                 if (http_max_requests != NULL)
1184                         max_requests = atoi(http_max_requests);
1185         }
1186
1187         curlm = curl_multi_init();
1188         if (!curlm)
1189                 die("curl_multi_init failed");
1190 #endif
1191
1192         if (getenv("GIT_SSL_NO_VERIFY"))
1193                 curl_ssl_verify = 0;
1194
1195         set_from_env(&ssl_cert, "GIT_SSL_CERT");
1196 #if LIBCURL_VERSION_NUM >= 0x070903
1197         set_from_env(&ssl_key, "GIT_SSL_KEY");
1198 #endif
1199 #if LIBCURL_VERSION_NUM >= 0x070908
1200         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1201 #endif
1202         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1203
1204         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1205
1206         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1207         if (low_speed_limit != NULL)
1208                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1209         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1210         if (low_speed_time != NULL)
1211                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1212
1213         if (curl_ssl_verify == -1)
1214                 curl_ssl_verify = 1;
1215
1216         curl_session_count = 0;
1217 #ifdef USE_CURL_MULTI
1218         if (max_requests < 1)
1219                 max_requests = DEFAULT_MAX_REQUESTS;
1220 #endif
1221
1222         set_from_env(&http_proxy_ssl_cert, "GIT_PROXY_SSL_CERT");
1223         set_from_env(&http_proxy_ssl_key, "GIT_PROXY_SSL_KEY");
1224         set_from_env(&http_proxy_ssl_ca_info, "GIT_PROXY_SSL_CAINFO");
1225
1226         if (getenv("GIT_PROXY_SSL_CERT_PASSWORD_PROTECTED"))
1227                 proxy_ssl_cert_password_required = 1;
1228
1229         if (getenv("GIT_CURL_FTP_NO_EPSV"))
1230                 curl_ftp_no_epsv = 1;
1231
1232         if (url) {
1233                 credential_from_url(&http_auth, url);
1234                 if (!ssl_cert_password_required &&
1235                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1236                     starts_with(url, "https://"))
1237                         ssl_cert_password_required = 1;
1238         }
1239
1240 #ifndef NO_CURL_EASY_DUPHANDLE
1241         curl_default = get_curl_handle();
1242 #endif
1243 }
1244
1245 void http_cleanup(void)
1246 {
1247         struct active_request_slot *slot = active_queue_head;
1248
1249         while (slot != NULL) {
1250                 struct active_request_slot *next = slot->next;
1251                 if (slot->curl != NULL) {
1252                         xmulti_remove_handle(slot);
1253                         curl_easy_cleanup(slot->curl);
1254                 }
1255                 free(slot);
1256                 slot = next;
1257         }
1258         active_queue_head = NULL;
1259
1260 #ifndef NO_CURL_EASY_DUPHANDLE
1261         curl_easy_cleanup(curl_default);
1262 #endif
1263
1264 #ifdef USE_CURL_MULTI
1265         curl_multi_cleanup(curlm);
1266 #endif
1267         curl_global_cleanup();
1268
1269         string_list_clear(&extra_http_headers, 0);
1270
1271         curl_slist_free_all(pragma_header);
1272         pragma_header = NULL;
1273
1274         curl_slist_free_all(no_pragma_header);
1275         no_pragma_header = NULL;
1276
1277         if (curl_http_proxy) {
1278                 free((void *)curl_http_proxy);
1279                 curl_http_proxy = NULL;
1280         }
1281
1282         if (proxy_auth.password) {
1283                 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1284                 FREE_AND_NULL(proxy_auth.password);
1285         }
1286
1287         free((void *)curl_proxyuserpwd);
1288         curl_proxyuserpwd = NULL;
1289
1290         free((void *)http_proxy_authmethod);
1291         http_proxy_authmethod = NULL;
1292
1293         if (cert_auth.password != NULL) {
1294                 memset(cert_auth.password, 0, strlen(cert_auth.password));
1295                 FREE_AND_NULL(cert_auth.password);
1296         }
1297         ssl_cert_password_required = 0;
1298
1299         if (proxy_cert_auth.password != NULL) {
1300                 memset(proxy_cert_auth.password, 0, strlen(proxy_cert_auth.password));
1301                 FREE_AND_NULL(proxy_cert_auth.password);
1302         }
1303         proxy_ssl_cert_password_required = 0;
1304
1305         FREE_AND_NULL(cached_accept_language);
1306 }
1307
1308 struct active_request_slot *get_active_slot(void)
1309 {
1310         struct active_request_slot *slot = active_queue_head;
1311         struct active_request_slot *newslot;
1312
1313 #ifdef USE_CURL_MULTI
1314         int num_transfers;
1315
1316         /* Wait for a slot to open up if the queue is full */
1317         while (active_requests >= max_requests) {
1318                 curl_multi_perform(curlm, &num_transfers);
1319                 if (num_transfers < active_requests)
1320                         process_curl_messages();
1321         }
1322 #endif
1323
1324         while (slot != NULL && slot->in_use)
1325                 slot = slot->next;
1326
1327         if (slot == NULL) {
1328                 newslot = xmalloc(sizeof(*newslot));
1329                 newslot->curl = NULL;
1330                 newslot->in_use = 0;
1331                 newslot->next = NULL;
1332
1333                 slot = active_queue_head;
1334                 if (slot == NULL) {
1335                         active_queue_head = newslot;
1336                 } else {
1337                         while (slot->next != NULL)
1338                                 slot = slot->next;
1339                         slot->next = newslot;
1340                 }
1341                 slot = newslot;
1342         }
1343
1344         if (slot->curl == NULL) {
1345 #ifdef NO_CURL_EASY_DUPHANDLE
1346                 slot->curl = get_curl_handle();
1347 #else
1348                 slot->curl = curl_easy_duphandle(curl_default);
1349 #endif
1350                 curl_session_count++;
1351         }
1352
1353         active_requests++;
1354         slot->in_use = 1;
1355         slot->results = NULL;
1356         slot->finished = NULL;
1357         slot->callback_data = NULL;
1358         slot->callback_func = NULL;
1359         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1360         if (curl_save_cookies)
1361                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1362         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1363         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1364         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1365         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1366         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1367         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1368         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1369         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1370         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1371         curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1372
1373         /*
1374          * Default following to off unless "ALWAYS" is configured; this gives
1375          * callers a sane starting point, and they can tweak for individual
1376          * HTTP_FOLLOW_* cases themselves.
1377          */
1378         if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1379                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1380         else
1381                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1382
1383 #if LIBCURL_VERSION_NUM >= 0x070a08
1384         curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1385 #endif
1386 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1387         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1388 #endif
1389         if (http_auth.password || curl_empty_auth_enabled())
1390                 init_curl_http_auth(slot->curl);
1391
1392         return slot;
1393 }
1394
1395 int start_active_slot(struct active_request_slot *slot)
1396 {
1397 #ifdef USE_CURL_MULTI
1398         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1399         int num_transfers;
1400
1401         if (curlm_result != CURLM_OK &&
1402             curlm_result != CURLM_CALL_MULTI_PERFORM) {
1403                 warning("curl_multi_add_handle failed: %s",
1404                         curl_multi_strerror(curlm_result));
1405                 active_requests--;
1406                 slot->in_use = 0;
1407                 return 0;
1408         }
1409
1410         /*
1411          * We know there must be something to do, since we just added
1412          * something.
1413          */
1414         curl_multi_perform(curlm, &num_transfers);
1415 #endif
1416         return 1;
1417 }
1418
1419 #ifdef USE_CURL_MULTI
1420 struct fill_chain {
1421         void *data;
1422         int (*fill)(void *);
1423         struct fill_chain *next;
1424 };
1425
1426 static struct fill_chain *fill_cfg;
1427
1428 void add_fill_function(void *data, int (*fill)(void *))
1429 {
1430         struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1431         struct fill_chain **linkp = &fill_cfg;
1432         new_fill->data = data;
1433         new_fill->fill = fill;
1434         new_fill->next = NULL;
1435         while (*linkp)
1436                 linkp = &(*linkp)->next;
1437         *linkp = new_fill;
1438 }
1439
1440 void fill_active_slots(void)
1441 {
1442         struct active_request_slot *slot = active_queue_head;
1443
1444         while (active_requests < max_requests) {
1445                 struct fill_chain *fill;
1446                 for (fill = fill_cfg; fill; fill = fill->next)
1447                         if (fill->fill(fill->data))
1448                                 break;
1449
1450                 if (!fill)
1451                         break;
1452         }
1453
1454         while (slot != NULL) {
1455                 if (!slot->in_use && slot->curl != NULL
1456                         && curl_session_count > min_curl_sessions) {
1457                         curl_easy_cleanup(slot->curl);
1458                         slot->curl = NULL;
1459                         curl_session_count--;
1460                 }
1461                 slot = slot->next;
1462         }
1463 }
1464
1465 void step_active_slots(void)
1466 {
1467         int num_transfers;
1468         CURLMcode curlm_result;
1469
1470         do {
1471                 curlm_result = curl_multi_perform(curlm, &num_transfers);
1472         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1473         if (num_transfers < active_requests) {
1474                 process_curl_messages();
1475                 fill_active_slots();
1476         }
1477 }
1478 #endif
1479
1480 void run_active_slot(struct active_request_slot *slot)
1481 {
1482 #ifdef USE_CURL_MULTI
1483         fd_set readfds;
1484         fd_set writefds;
1485         fd_set excfds;
1486         int max_fd;
1487         struct timeval select_timeout;
1488         int finished = 0;
1489
1490         slot->finished = &finished;
1491         while (!finished) {
1492                 step_active_slots();
1493
1494                 if (slot->in_use) {
1495 #if LIBCURL_VERSION_NUM >= 0x070f04
1496                         long curl_timeout;
1497                         curl_multi_timeout(curlm, &curl_timeout);
1498                         if (curl_timeout == 0) {
1499                                 continue;
1500                         } else if (curl_timeout == -1) {
1501                                 select_timeout.tv_sec  = 0;
1502                                 select_timeout.tv_usec = 50000;
1503                         } else {
1504                                 select_timeout.tv_sec  =  curl_timeout / 1000;
1505                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1506                         }
1507 #else
1508                         select_timeout.tv_sec  = 0;
1509                         select_timeout.tv_usec = 50000;
1510 #endif
1511
1512                         max_fd = -1;
1513                         FD_ZERO(&readfds);
1514                         FD_ZERO(&writefds);
1515                         FD_ZERO(&excfds);
1516                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1517
1518                         /*
1519                          * It can happen that curl_multi_timeout returns a pathologically
1520                          * long timeout when curl_multi_fdset returns no file descriptors
1521                          * to read.  See commit message for more details.
1522                          */
1523                         if (max_fd < 0 &&
1524                             (select_timeout.tv_sec > 0 ||
1525                              select_timeout.tv_usec > 50000)) {
1526                                 select_timeout.tv_sec  = 0;
1527                                 select_timeout.tv_usec = 50000;
1528                         }
1529
1530                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1531                 }
1532         }
1533 #else
1534         while (slot->in_use) {
1535                 slot->curl_result = curl_easy_perform(slot->curl);
1536                 finish_active_slot(slot);
1537         }
1538 #endif
1539 }
1540
1541 static void release_active_slot(struct active_request_slot *slot)
1542 {
1543         closedown_active_slot(slot);
1544         if (slot->curl) {
1545                 xmulti_remove_handle(slot);
1546                 if (curl_session_count > min_curl_sessions) {
1547                         curl_easy_cleanup(slot->curl);
1548                         slot->curl = NULL;
1549                         curl_session_count--;
1550                 }
1551         }
1552 #ifdef USE_CURL_MULTI
1553         fill_active_slots();
1554 #endif
1555 }
1556
1557 void finish_all_active_slots(void)
1558 {
1559         struct active_request_slot *slot = active_queue_head;
1560
1561         while (slot != NULL)
1562                 if (slot->in_use) {
1563                         run_active_slot(slot);
1564                         slot = active_queue_head;
1565                 } else {
1566                         slot = slot->next;
1567                 }
1568 }
1569
1570 /* Helpers for modifying and creating URLs */
1571 static inline int needs_quote(int ch)
1572 {
1573         if (((ch >= 'A') && (ch <= 'Z'))
1574                         || ((ch >= 'a') && (ch <= 'z'))
1575                         || ((ch >= '0') && (ch <= '9'))
1576                         || (ch == '/')
1577                         || (ch == '-')
1578                         || (ch == '.'))
1579                 return 0;
1580         return 1;
1581 }
1582
1583 static char *quote_ref_url(const char *base, const char *ref)
1584 {
1585         struct strbuf buf = STRBUF_INIT;
1586         const char *cp;
1587         int ch;
1588
1589         end_url_with_slash(&buf, base);
1590
1591         for (cp = ref; (ch = *cp) != 0; cp++)
1592                 if (needs_quote(ch))
1593                         strbuf_addf(&buf, "%%%02x", ch);
1594                 else
1595                         strbuf_addch(&buf, *cp);
1596
1597         return strbuf_detach(&buf, NULL);
1598 }
1599
1600 void append_remote_object_url(struct strbuf *buf, const char *url,
1601                               const char *hex,
1602                               int only_two_digit_prefix)
1603 {
1604         end_url_with_slash(buf, url);
1605
1606         strbuf_addf(buf, "objects/%.*s/", 2, hex);
1607         if (!only_two_digit_prefix)
1608                 strbuf_addstr(buf, hex + 2);
1609 }
1610
1611 char *get_remote_object_url(const char *url, const char *hex,
1612                             int only_two_digit_prefix)
1613 {
1614         struct strbuf buf = STRBUF_INIT;
1615         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1616         return strbuf_detach(&buf, NULL);
1617 }
1618
1619 void normalize_curl_result(CURLcode *result, long http_code,
1620                            char *errorstr, size_t errorlen)
1621 {
1622         /*
1623          * If we see a failing http code with CURLE_OK, we have turned off
1624          * FAILONERROR (to keep the server's custom error response), and should
1625          * translate the code into failure here.
1626          *
1627          * Likewise, if we see a redirect (30x code), that means we turned off
1628          * redirect-following, and we should treat the result as an error.
1629          */
1630         if (*result == CURLE_OK && http_code >= 300) {
1631                 *result = CURLE_HTTP_RETURNED_ERROR;
1632                 /*
1633                  * Normally curl will already have put the "reason phrase"
1634                  * from the server into curl_errorstr; unfortunately without
1635                  * FAILONERROR it is lost, so we can give only the numeric
1636                  * status code.
1637                  */
1638                 xsnprintf(errorstr, errorlen,
1639                           "The requested URL returned error: %ld",
1640                           http_code);
1641         }
1642 }
1643
1644 static int handle_curl_result(struct slot_results *results)
1645 {
1646         normalize_curl_result(&results->curl_result, results->http_code,
1647                               curl_errorstr, sizeof(curl_errorstr));
1648
1649         if (results->curl_result == CURLE_OK) {
1650                 credential_approve(&http_auth);
1651                 if (proxy_auth.password)
1652                         credential_approve(&proxy_auth);
1653                 return HTTP_OK;
1654         } else if (missing_target(results))
1655                 return HTTP_MISSING_TARGET;
1656         else if (results->http_code == 401) {
1657                 if (http_auth.username && http_auth.password) {
1658                         credential_reject(&http_auth);
1659                         return HTTP_NOAUTH;
1660                 } else {
1661 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1662                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1663                         if (results->auth_avail) {
1664                                 http_auth_methods &= results->auth_avail;
1665                                 http_auth_methods_restricted = 1;
1666                         }
1667 #endif
1668                         return HTTP_REAUTH;
1669                 }
1670         } else {
1671                 if (results->http_connectcode == 407)
1672                         credential_reject(&proxy_auth);
1673 #if LIBCURL_VERSION_NUM >= 0x070c00
1674                 if (!curl_errorstr[0])
1675                         strlcpy(curl_errorstr,
1676                                 curl_easy_strerror(results->curl_result),
1677                                 sizeof(curl_errorstr));
1678 #endif
1679                 return HTTP_ERROR;
1680         }
1681 }
1682
1683 int run_one_slot(struct active_request_slot *slot,
1684                  struct slot_results *results)
1685 {
1686         slot->results = results;
1687         if (!start_active_slot(slot)) {
1688                 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1689                           "failed to start HTTP request");
1690                 return HTTP_START_FAILED;
1691         }
1692
1693         run_active_slot(slot);
1694         return handle_curl_result(results);
1695 }
1696
1697 struct curl_slist *http_copy_default_headers(void)
1698 {
1699         struct curl_slist *headers = NULL;
1700         const struct string_list_item *item;
1701
1702         for_each_string_list_item(item, &extra_http_headers)
1703                 headers = curl_slist_append(headers, item->string);
1704
1705         return headers;
1706 }
1707
1708 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1709 {
1710         char *ptr;
1711         CURLcode ret;
1712
1713         strbuf_reset(buf);
1714         ret = curl_easy_getinfo(curl, info, &ptr);
1715         if (!ret && ptr)
1716                 strbuf_addstr(buf, ptr);
1717         return ret;
1718 }
1719
1720 /*
1721  * Check for and extract a content-type parameter. "raw"
1722  * should be positioned at the start of the potential
1723  * parameter, with any whitespace already removed.
1724  *
1725  * "name" is the name of the parameter. The value is appended
1726  * to "out".
1727  */
1728 static int extract_param(const char *raw, const char *name,
1729                          struct strbuf *out)
1730 {
1731         size_t len = strlen(name);
1732
1733         if (strncasecmp(raw, name, len))
1734                 return -1;
1735         raw += len;
1736
1737         if (*raw != '=')
1738                 return -1;
1739         raw++;
1740
1741         while (*raw && !isspace(*raw) && *raw != ';')
1742                 strbuf_addch(out, *raw++);
1743         return 0;
1744 }
1745
1746 /*
1747  * Extract a normalized version of the content type, with any
1748  * spaces suppressed, all letters lowercased, and no trailing ";"
1749  * or parameters.
1750  *
1751  * Note that we will silently remove even invalid whitespace. For
1752  * example, "text / plain" is specifically forbidden by RFC 2616,
1753  * but "text/plain" is the only reasonable output, and this keeps
1754  * our code simple.
1755  *
1756  * If the "charset" argument is not NULL, store the value of any
1757  * charset parameter there.
1758  *
1759  * Example:
1760  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1761  *   "text / plain" -> "text/plain"
1762  */
1763 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1764                                  struct strbuf *charset)
1765 {
1766         const char *p;
1767
1768         strbuf_reset(type);
1769         strbuf_grow(type, raw->len);
1770         for (p = raw->buf; *p; p++) {
1771                 if (isspace(*p))
1772                         continue;
1773                 if (*p == ';') {
1774                         p++;
1775                         break;
1776                 }
1777                 strbuf_addch(type, tolower(*p));
1778         }
1779
1780         if (!charset)
1781                 return;
1782
1783         strbuf_reset(charset);
1784         while (*p) {
1785                 while (isspace(*p) || *p == ';')
1786                         p++;
1787                 if (!extract_param(p, "charset", charset))
1788                         return;
1789                 while (*p && !isspace(*p))
1790                         p++;
1791         }
1792
1793         if (!charset->len && starts_with(type->buf, "text/"))
1794                 strbuf_addstr(charset, "ISO-8859-1");
1795 }
1796
1797 static void write_accept_language(struct strbuf *buf)
1798 {
1799         /*
1800          * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1801          * that, q-value will be smaller than 0.001, the minimum q-value the
1802          * HTTP specification allows. See
1803          * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1804          */
1805         const int MAX_DECIMAL_PLACES = 3;
1806         const int MAX_LANGUAGE_TAGS = 1000;
1807         const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1808         char **language_tags = NULL;
1809         int num_langs = 0;
1810         const char *s = get_preferred_languages();
1811         int i;
1812         struct strbuf tag = STRBUF_INIT;
1813
1814         /* Don't add Accept-Language header if no language is preferred. */
1815         if (!s)
1816                 return;
1817
1818         /*
1819          * Split the colon-separated string of preferred languages into
1820          * language_tags array.
1821          */
1822         do {
1823                 /* collect language tag */
1824                 for (; *s && (isalnum(*s) || *s == '_'); s++)
1825                         strbuf_addch(&tag, *s == '_' ? '-' : *s);
1826
1827                 /* skip .codeset, @modifier and any other unnecessary parts */
1828                 while (*s && *s != ':')
1829                         s++;
1830
1831                 if (tag.len) {
1832                         num_langs++;
1833                         REALLOC_ARRAY(language_tags, num_langs);
1834                         language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1835                         if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1836                                 break;
1837                 }
1838         } while (*s++);
1839
1840         /* write Accept-Language header into buf */
1841         if (num_langs) {
1842                 int last_buf_len = 0;
1843                 int max_q;
1844                 int decimal_places;
1845                 char q_format[32];
1846
1847                 /* add '*' */
1848                 REALLOC_ARRAY(language_tags, num_langs + 1);
1849                 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1850
1851                 /* compute decimal_places */
1852                 for (max_q = 1, decimal_places = 0;
1853                      max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1854                      decimal_places++, max_q *= 10)
1855                         ;
1856
1857                 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1858
1859                 strbuf_addstr(buf, "Accept-Language: ");
1860
1861                 for (i = 0; i < num_langs; i++) {
1862                         if (i > 0)
1863                                 strbuf_addstr(buf, ", ");
1864
1865                         strbuf_addstr(buf, language_tags[i]);
1866
1867                         if (i > 0)
1868                                 strbuf_addf(buf, q_format, max_q - i);
1869
1870                         if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1871                                 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1872                                 break;
1873                         }
1874
1875                         last_buf_len = buf->len;
1876                 }
1877         }
1878
1879         /* free language tags -- last one is a static '*' */
1880         for (i = 0; i < num_langs - 1; i++)
1881                 free(language_tags[i]);
1882         free(language_tags);
1883 }
1884
1885 /*
1886  * Get an Accept-Language header which indicates user's preferred languages.
1887  *
1888  * Examples:
1889  *   LANGUAGE= -> ""
1890  *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1891  *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1892  *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1893  *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1894  *   LANGUAGE= LANG=C -> ""
1895  */
1896 static const char *get_accept_language(void)
1897 {
1898         if (!cached_accept_language) {
1899                 struct strbuf buf = STRBUF_INIT;
1900                 write_accept_language(&buf);
1901                 if (buf.len > 0)
1902                         cached_accept_language = strbuf_detach(&buf, NULL);
1903         }
1904
1905         return cached_accept_language;
1906 }
1907
1908 static void http_opt_request_remainder(CURL *curl, off_t pos)
1909 {
1910         char buf[128];
1911         xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1912         curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1913 }
1914
1915 /* http_request() targets */
1916 #define HTTP_REQUEST_STRBUF     0
1917 #define HTTP_REQUEST_FILE       1
1918
1919 static int http_request(const char *url,
1920                         void *result, int target,
1921                         const struct http_get_options *options)
1922 {
1923         struct active_request_slot *slot;
1924         struct slot_results results;
1925         struct curl_slist *headers = http_copy_default_headers();
1926         struct strbuf buf = STRBUF_INIT;
1927         const char *accept_language;
1928         int ret;
1929
1930         slot = get_active_slot();
1931         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1932
1933         if (result == NULL) {
1934                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1935         } else {
1936                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1937                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1938
1939                 if (target == HTTP_REQUEST_FILE) {
1940                         off_t posn = ftello(result);
1941                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1942                                          fwrite);
1943                         if (posn > 0)
1944                                 http_opt_request_remainder(slot->curl, posn);
1945                 } else
1946                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1947                                          fwrite_buffer);
1948         }
1949
1950         accept_language = get_accept_language();
1951
1952         if (accept_language)
1953                 headers = curl_slist_append(headers, accept_language);
1954
1955         strbuf_addstr(&buf, "Pragma:");
1956         if (options && options->no_cache)
1957                 strbuf_addstr(&buf, " no-cache");
1958         if (options && options->initial_request &&
1959             http_follow_config == HTTP_FOLLOW_INITIAL)
1960                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1961
1962         headers = curl_slist_append(headers, buf.buf);
1963
1964         /* Add additional headers here */
1965         if (options && options->extra_headers) {
1966                 const struct string_list_item *item;
1967                 for_each_string_list_item(item, options->extra_headers) {
1968                         headers = curl_slist_append(headers, item->string);
1969                 }
1970         }
1971
1972         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1973         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1974         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1975         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1976
1977         ret = run_one_slot(slot, &results);
1978
1979         if (options && options->content_type) {
1980                 struct strbuf raw = STRBUF_INIT;
1981                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1982                 extract_content_type(&raw, options->content_type,
1983                                      options->charset);
1984                 strbuf_release(&raw);
1985         }
1986
1987         if (options && options->effective_url)
1988                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1989                                 options->effective_url);
1990
1991         curl_slist_free_all(headers);
1992         strbuf_release(&buf);
1993
1994         return ret;
1995 }
1996
1997 /*
1998  * Update the "base" url to a more appropriate value, as deduced by
1999  * redirects seen when requesting a URL starting with "url".
2000  *
2001  * The "asked" parameter is a URL that we asked curl to access, and must begin
2002  * with "base".
2003  *
2004  * The "got" parameter is the URL that curl reported to us as where we ended
2005  * up.
2006  *
2007  * Returns 1 if we updated the base url, 0 otherwise.
2008  *
2009  * Our basic strategy is to compare "base" and "asked" to find the bits
2010  * specific to our request. We then strip those bits off of "got" to yield the
2011  * new base. So for example, if our base is "http://example.com/foo.git",
2012  * and we ask for "http://example.com/foo.git/info/refs", we might end up
2013  * with "https://other.example.com/foo.git/info/refs". We would want the
2014  * new URL to become "https://other.example.com/foo.git".
2015  *
2016  * Note that this assumes a sane redirect scheme. It's entirely possible
2017  * in the example above to end up at a URL that does not even end in
2018  * "info/refs".  In such a case we die. There's not much we can do, such a
2019  * scheme is unlikely to represent a real git repository, and failing to
2020  * rewrite the base opens options for malicious redirects to do funny things.
2021  */
2022 static int update_url_from_redirect(struct strbuf *base,
2023                                     const char *asked,
2024                                     const struct strbuf *got)
2025 {
2026         const char *tail;
2027         size_t new_len;
2028
2029         if (!strcmp(asked, got->buf))
2030                 return 0;
2031
2032         if (!skip_prefix(asked, base->buf, &tail))
2033                 BUG("update_url_from_redirect: %s is not a superset of %s",
2034                     asked, base->buf);
2035
2036         new_len = got->len;
2037         if (!strip_suffix_mem(got->buf, &new_len, tail))
2038                 die(_("unable to update url base from redirection:\n"
2039                       "  asked for: %s\n"
2040                       "   redirect: %s"),
2041                     asked, got->buf);
2042
2043         strbuf_reset(base);
2044         strbuf_add(base, got->buf, new_len);
2045
2046         return 1;
2047 }
2048
2049 static int http_request_reauth(const char *url,
2050                                void *result, int target,
2051                                struct http_get_options *options)
2052 {
2053         int ret = http_request(url, result, target, options);
2054
2055         if (ret != HTTP_OK && ret != HTTP_REAUTH)
2056                 return ret;
2057
2058         if (options && options->effective_url && options->base_url) {
2059                 if (update_url_from_redirect(options->base_url,
2060                                              url, options->effective_url)) {
2061                         credential_from_url(&http_auth, options->base_url->buf);
2062                         url = options->effective_url->buf;
2063                 }
2064         }
2065
2066         if (ret != HTTP_REAUTH)
2067                 return ret;
2068
2069         /*
2070          * The previous request may have put cruft into our output stream; we
2071          * should clear it out before making our next request.
2072          */
2073         switch (target) {
2074         case HTTP_REQUEST_STRBUF:
2075                 strbuf_reset(result);
2076                 break;
2077         case HTTP_REQUEST_FILE:
2078                 if (fflush(result)) {
2079                         error_errno("unable to flush a file");
2080                         return HTTP_START_FAILED;
2081                 }
2082                 rewind(result);
2083                 if (ftruncate(fileno(result), 0) < 0) {
2084                         error_errno("unable to truncate a file");
2085                         return HTTP_START_FAILED;
2086                 }
2087                 break;
2088         default:
2089                 BUG("Unknown http_request target");
2090         }
2091
2092         credential_fill(&http_auth);
2093
2094         return http_request(url, result, target, options);
2095 }
2096
2097 int http_get_strbuf(const char *url,
2098                     struct strbuf *result,
2099                     struct http_get_options *options)
2100 {
2101         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
2102 }
2103
2104 /*
2105  * Downloads a URL and stores the result in the given file.
2106  *
2107  * If a previous interrupted download is detected (i.e. a previous temporary
2108  * file is still around) the download is resumed.
2109  */
2110 static int http_get_file(const char *url, const char *filename,
2111                          struct http_get_options *options)
2112 {
2113         int ret;
2114         struct strbuf tmpfile = STRBUF_INIT;
2115         FILE *result;
2116
2117         strbuf_addf(&tmpfile, "%s.temp", filename);
2118         result = fopen(tmpfile.buf, "a");
2119         if (!result) {
2120                 error("Unable to open local file %s", tmpfile.buf);
2121                 ret = HTTP_ERROR;
2122                 goto cleanup;
2123         }
2124
2125         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
2126         fclose(result);
2127
2128         if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
2129                 ret = HTTP_ERROR;
2130 cleanup:
2131         strbuf_release(&tmpfile);
2132         return ret;
2133 }
2134
2135 int http_fetch_ref(const char *base, struct ref *ref)
2136 {
2137         struct http_get_options options = {0};
2138         char *url;
2139         struct strbuf buffer = STRBUF_INIT;
2140         int ret = -1;
2141
2142         options.no_cache = 1;
2143
2144         url = quote_ref_url(base, ref->name);
2145         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
2146                 strbuf_rtrim(&buffer);
2147                 if (buffer.len == the_hash_algo->hexsz)
2148                         ret = get_oid_hex(buffer.buf, &ref->old_oid);
2149                 else if (starts_with(buffer.buf, "ref: ")) {
2150                         ref->symref = xstrdup(buffer.buf + 5);
2151                         ret = 0;
2152                 }
2153         }
2154
2155         strbuf_release(&buffer);
2156         free(url);
2157         return ret;
2158 }
2159
2160 /* Helpers for fetching packs */
2161 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
2162 {
2163         char *url, *tmp;
2164         struct strbuf buf = STRBUF_INIT;
2165
2166         if (http_is_verbose)
2167                 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2168
2169         end_url_with_slash(&buf, base_url);
2170         strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2171         url = strbuf_detach(&buf, NULL);
2172
2173         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2174         tmp = strbuf_detach(&buf, NULL);
2175
2176         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2177                 error("Unable to get pack index %s", url);
2178                 FREE_AND_NULL(tmp);
2179         }
2180
2181         free(url);
2182         return tmp;
2183 }
2184
2185 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2186         unsigned char *sha1, const char *base_url)
2187 {
2188         struct packed_git *new_pack;
2189         char *tmp_idx = NULL;
2190         int ret;
2191
2192         if (has_pack_index(sha1)) {
2193                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2194                 if (!new_pack)
2195                         return -1; /* parse_pack_index() already issued error message */
2196                 goto add_pack;
2197         }
2198
2199         tmp_idx = fetch_pack_index(sha1, base_url);
2200         if (!tmp_idx)
2201                 return -1;
2202
2203         new_pack = parse_pack_index(sha1, tmp_idx);
2204         if (!new_pack) {
2205                 unlink(tmp_idx);
2206                 free(tmp_idx);
2207
2208                 return -1; /* parse_pack_index() already issued error message */
2209         }
2210
2211         ret = verify_pack_index(new_pack);
2212         if (!ret) {
2213                 close_pack_index(new_pack);
2214                 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2215         }
2216         free(tmp_idx);
2217         if (ret)
2218                 return -1;
2219
2220 add_pack:
2221         new_pack->next = *packs_head;
2222         *packs_head = new_pack;
2223         return 0;
2224 }
2225
2226 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2227 {
2228         struct http_get_options options = {0};
2229         int ret = 0;
2230         char *url;
2231         const char *data;
2232         struct strbuf buf = STRBUF_INIT;
2233         struct object_id oid;
2234
2235         end_url_with_slash(&buf, base_url);
2236         strbuf_addstr(&buf, "objects/info/packs");
2237         url = strbuf_detach(&buf, NULL);
2238
2239         options.no_cache = 1;
2240         ret = http_get_strbuf(url, &buf, &options);
2241         if (ret != HTTP_OK)
2242                 goto cleanup;
2243
2244         data = buf.buf;
2245         while (*data) {
2246                 if (skip_prefix(data, "P pack-", &data) &&
2247                     !parse_oid_hex(data, &oid, &data) &&
2248                     skip_prefix(data, ".pack", &data) &&
2249                     (*data == '\n' || *data == '\0')) {
2250                         fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2251                 } else {
2252                         data = strchrnul(data, '\n');
2253                 }
2254                 if (*data)
2255                         data++; /* skip past newline */
2256         }
2257
2258 cleanup:
2259         free(url);
2260         return ret;
2261 }
2262
2263 void release_http_pack_request(struct http_pack_request *preq)
2264 {
2265         if (preq->packfile != NULL) {
2266                 fclose(preq->packfile);
2267                 preq->packfile = NULL;
2268         }
2269         preq->slot = NULL;
2270         strbuf_release(&preq->tmpfile);
2271         free(preq->url);
2272         free(preq);
2273 }
2274
2275 int finish_http_pack_request(struct http_pack_request *preq)
2276 {
2277         struct packed_git **lst;
2278         struct packed_git *p = preq->target;
2279         char *tmp_idx;
2280         size_t len;
2281         struct child_process ip = CHILD_PROCESS_INIT;
2282
2283         close_pack_index(p);
2284
2285         fclose(preq->packfile);
2286         preq->packfile = NULL;
2287
2288         lst = preq->lst;
2289         while (*lst != p)
2290                 lst = &((*lst)->next);
2291         *lst = (*lst)->next;
2292
2293         if (!strip_suffix(preq->tmpfile.buf, ".pack.temp", &len))
2294                 BUG("pack tmpfile does not end in .pack.temp?");
2295         tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile.buf);
2296
2297         argv_array_push(&ip.args, "index-pack");
2298         argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2299         argv_array_push(&ip.args, preq->tmpfile.buf);
2300         ip.git_cmd = 1;
2301         ip.no_stdin = 1;
2302         ip.no_stdout = 1;
2303
2304         if (run_command(&ip)) {
2305                 unlink(preq->tmpfile.buf);
2306                 unlink(tmp_idx);
2307                 free(tmp_idx);
2308                 return -1;
2309         }
2310
2311         unlink(sha1_pack_index_name(p->hash));
2312
2313         if (finalize_object_file(preq->tmpfile.buf, sha1_pack_name(p->hash))
2314          || finalize_object_file(tmp_idx, sha1_pack_index_name(p->hash))) {
2315                 free(tmp_idx);
2316                 return -1;
2317         }
2318
2319         install_packed_git(the_repository, p);
2320         free(tmp_idx);
2321         return 0;
2322 }
2323
2324 struct http_pack_request *new_http_pack_request(
2325         struct packed_git *target, const char *base_url)
2326 {
2327         off_t prev_posn = 0;
2328         struct strbuf buf = STRBUF_INIT;
2329         struct http_pack_request *preq;
2330
2331         preq = xcalloc(1, sizeof(*preq));
2332         strbuf_init(&preq->tmpfile, 0);
2333         preq->target = target;
2334
2335         end_url_with_slash(&buf, base_url);
2336         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2337                 hash_to_hex(target->hash));
2338         preq->url = strbuf_detach(&buf, NULL);
2339
2340         strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(target->hash));
2341         preq->packfile = fopen(preq->tmpfile.buf, "a");
2342         if (!preq->packfile) {
2343                 error("Unable to open local file %s for pack",
2344                       preq->tmpfile.buf);
2345                 goto abort;
2346         }
2347
2348         preq->slot = get_active_slot();
2349         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2350         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2351         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2352         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2353                 no_pragma_header);
2354
2355         /*
2356          * If there is data present from a previous transfer attempt,
2357          * resume where it left off
2358          */
2359         prev_posn = ftello(preq->packfile);
2360         if (prev_posn>0) {
2361                 if (http_is_verbose)
2362                         fprintf(stderr,
2363                                 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2364                                 hash_to_hex(target->hash),
2365                                 (uintmax_t)prev_posn);
2366                 http_opt_request_remainder(preq->slot->curl, prev_posn);
2367         }
2368
2369         return preq;
2370
2371 abort:
2372         strbuf_release(&preq->tmpfile);
2373         free(preq->url);
2374         free(preq);
2375         return NULL;
2376 }
2377
2378 /* Helpers for fetching objects (loose) */
2379 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2380                                void *data)
2381 {
2382         unsigned char expn[4096];
2383         size_t size = eltsize * nmemb;
2384         int posn = 0;
2385         struct http_object_request *freq = data;
2386         struct active_request_slot *slot = freq->slot;
2387
2388         if (slot) {
2389                 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2390                                                 &slot->http_code);
2391                 if (c != CURLE_OK)
2392                         BUG("curl_easy_getinfo for HTTP code failed: %s",
2393                                 curl_easy_strerror(c));
2394                 if (slot->http_code >= 300)
2395                         return nmemb;
2396         }
2397
2398         do {
2399                 ssize_t retval = xwrite(freq->localfile,
2400                                         (char *) ptr + posn, size - posn);
2401                 if (retval < 0)
2402                         return posn / eltsize;
2403                 posn += retval;
2404         } while (posn < size);
2405
2406         freq->stream.avail_in = size;
2407         freq->stream.next_in = (void *)ptr;
2408         do {
2409                 freq->stream.next_out = expn;
2410                 freq->stream.avail_out = sizeof(expn);
2411                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2412                 the_hash_algo->update_fn(&freq->c, expn,
2413                                          sizeof(expn) - freq->stream.avail_out);
2414         } while (freq->stream.avail_in && freq->zret == Z_OK);
2415         return nmemb;
2416 }
2417
2418 struct http_object_request *new_http_object_request(const char *base_url,
2419                                                     const struct object_id *oid)
2420 {
2421         char *hex = oid_to_hex(oid);
2422         struct strbuf filename = STRBUF_INIT;
2423         struct strbuf prevfile = STRBUF_INIT;
2424         int prevlocal;
2425         char prev_buf[PREV_BUF_SIZE];
2426         ssize_t prev_read = 0;
2427         off_t prev_posn = 0;
2428         struct http_object_request *freq;
2429
2430         freq = xcalloc(1, sizeof(*freq));
2431         strbuf_init(&freq->tmpfile, 0);
2432         oidcpy(&freq->oid, oid);
2433         freq->localfile = -1;
2434
2435         loose_object_path(the_repository, &filename, oid);
2436         strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2437
2438         strbuf_addf(&prevfile, "%s.prev", filename.buf);
2439         unlink_or_warn(prevfile.buf);
2440         rename(freq->tmpfile.buf, prevfile.buf);
2441         unlink_or_warn(freq->tmpfile.buf);
2442         strbuf_release(&filename);
2443
2444         if (freq->localfile != -1)
2445                 error("fd leakage in start: %d", freq->localfile);
2446         freq->localfile = open(freq->tmpfile.buf,
2447                                O_WRONLY | O_CREAT | O_EXCL, 0666);
2448         /*
2449          * This could have failed due to the "lazy directory creation";
2450          * try to mkdir the last path component.
2451          */
2452         if (freq->localfile < 0 && errno == ENOENT) {
2453                 char *dir = strrchr(freq->tmpfile.buf, '/');
2454                 if (dir) {
2455                         *dir = 0;
2456                         mkdir(freq->tmpfile.buf, 0777);
2457                         *dir = '/';
2458                 }
2459                 freq->localfile = open(freq->tmpfile.buf,
2460                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
2461         }
2462
2463         if (freq->localfile < 0) {
2464                 error_errno("Couldn't create temporary file %s",
2465                             freq->tmpfile.buf);
2466                 goto abort;
2467         }
2468
2469         git_inflate_init(&freq->stream);
2470
2471         the_hash_algo->init_fn(&freq->c);
2472
2473         freq->url = get_remote_object_url(base_url, hex, 0);
2474
2475         /*
2476          * If a previous temp file is present, process what was already
2477          * fetched.
2478          */
2479         prevlocal = open(prevfile.buf, O_RDONLY);
2480         if (prevlocal != -1) {
2481                 do {
2482                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2483                         if (prev_read>0) {
2484                                 if (fwrite_sha1_file(prev_buf,
2485                                                      1,
2486                                                      prev_read,
2487                                                      freq) == prev_read) {
2488                                         prev_posn += prev_read;
2489                                 } else {
2490                                         prev_read = -1;
2491                                 }
2492                         }
2493                 } while (prev_read > 0);
2494                 close(prevlocal);
2495         }
2496         unlink_or_warn(prevfile.buf);
2497         strbuf_release(&prevfile);
2498
2499         /*
2500          * Reset inflate/SHA1 if there was an error reading the previous temp
2501          * file; also rewind to the beginning of the local file.
2502          */
2503         if (prev_read == -1) {
2504                 memset(&freq->stream, 0, sizeof(freq->stream));
2505                 git_inflate_init(&freq->stream);
2506                 the_hash_algo->init_fn(&freq->c);
2507                 if (prev_posn>0) {
2508                         prev_posn = 0;
2509                         lseek(freq->localfile, 0, SEEK_SET);
2510                         if (ftruncate(freq->localfile, 0) < 0) {
2511                                 error_errno("Couldn't truncate temporary file %s",
2512                                             freq->tmpfile.buf);
2513                                 goto abort;
2514                         }
2515                 }
2516         }
2517
2518         freq->slot = get_active_slot();
2519
2520         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2521         curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2522         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2523         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2524         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2525         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2526
2527         /*
2528          * If we have successfully processed data from a previous fetch
2529          * attempt, only fetch the data we don't already have.
2530          */
2531         if (prev_posn>0) {
2532                 if (http_is_verbose)
2533                         fprintf(stderr,
2534                                 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2535                                 hex, (uintmax_t)prev_posn);
2536                 http_opt_request_remainder(freq->slot->curl, prev_posn);
2537         }
2538
2539         return freq;
2540
2541 abort:
2542         strbuf_release(&prevfile);
2543         free(freq->url);
2544         free(freq);
2545         return NULL;
2546 }
2547
2548 void process_http_object_request(struct http_object_request *freq)
2549 {
2550         if (freq->slot == NULL)
2551                 return;
2552         freq->curl_result = freq->slot->curl_result;
2553         freq->http_code = freq->slot->http_code;
2554         freq->slot = NULL;
2555 }
2556
2557 int finish_http_object_request(struct http_object_request *freq)
2558 {
2559         struct stat st;
2560         struct strbuf filename = STRBUF_INIT;
2561
2562         close(freq->localfile);
2563         freq->localfile = -1;
2564
2565         process_http_object_request(freq);
2566
2567         if (freq->http_code == 416) {
2568                 warning("requested range invalid; we may already have all the data.");
2569         } else if (freq->curl_result != CURLE_OK) {
2570                 if (stat(freq->tmpfile.buf, &st) == 0)
2571                         if (st.st_size == 0)
2572                                 unlink_or_warn(freq->tmpfile.buf);
2573                 return -1;
2574         }
2575
2576         git_inflate_end(&freq->stream);
2577         the_hash_algo->final_fn(freq->real_oid.hash, &freq->c);
2578         if (freq->zret != Z_STREAM_END) {
2579                 unlink_or_warn(freq->tmpfile.buf);
2580                 return -1;
2581         }
2582         if (!oideq(&freq->oid, &freq->real_oid)) {
2583                 unlink_or_warn(freq->tmpfile.buf);
2584                 return -1;
2585         }
2586         loose_object_path(the_repository, &filename, &freq->oid);
2587         freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2588         strbuf_release(&filename);
2589
2590         return freq->rename;
2591 }
2592
2593 void abort_http_object_request(struct http_object_request *freq)
2594 {
2595         unlink_or_warn(freq->tmpfile.buf);
2596
2597         release_http_object_request(freq);
2598 }
2599
2600 void release_http_object_request(struct http_object_request *freq)
2601 {
2602         if (freq->localfile != -1) {
2603                 close(freq->localfile);
2604                 freq->localfile = -1;
2605         }
2606         FREE_AND_NULL(freq->url);
2607         if (freq->slot != NULL) {
2608                 freq->slot->callback_func = NULL;
2609                 freq->slot->callback_data = NULL;
2610                 release_active_slot(freq->slot);
2611                 freq->slot = NULL;
2612         }
2613         strbuf_release(&freq->tmpfile);
2614 }