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