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