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
  18 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
  19 static struct string_list cookies_to_redact = STRING_LIST_INIT_DUP;
  20 #if LIBCURL_VERSION_NUM >= 0x070a08
  21 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  22 #else
  23 long int git_curl_ipresolve;
  24 #endif
  25 int active_requests;
  26 int http_is_verbose;
  27 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  28
  29 #if LIBCURL_VERSION_NUM >= 0x070a06
  30 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  31 #endif
  32
  33 static int min_curl_sessions = 1;
  34 static int curl_session_count;
  35 #ifdef USE_CURL_MULTI
  36 static int max_requests = -1;
  37 static CURLM *curlm;
  38 #endif
  39 #ifndef NO_CURL_EASY_DUPHANDLE
  40 static CURL *curl_default;
  41 #endif
  42
  43 #define PREV_BUF_SIZE 4096
  44
  45 char curl_errorstr[CURL_ERROR_SIZE];
  46
  47 static int curl_ssl_verify = -1;
  48 static int curl_ssl_try;
  49 static const char *ssl_cert;
  50 static const char *ssl_cipherlist;
  51 static const char *ssl_version;
  52 static struct {
  53         const char *name;
  54         long ssl_version;
  55 } sslversions[] = {
  56         { "sslv2", CURL_SSLVERSION_SSLv2 },
  57         { "sslv3", CURL_SSLVERSION_SSLv3 },
  58         { "tlsv1", CURL_SSLVERSION_TLSv1 },
  59 #if LIBCURL_VERSION_NUM >= 0x072200
  60         { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  61         { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  62         { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  63 #endif
  64 };
  65 #if LIBCURL_VERSION_NUM >= 0x070903
  66 static const char *ssl_key;
  67 #endif
  68 #if LIBCURL_VERSION_NUM >= 0x070908
  69 static const char *ssl_capath;
  70 #endif
  71 #if LIBCURL_VERSION_NUM >= 0x072c00
  72 static const char *ssl_pinnedkey;
  73 #endif
  74 static const char *ssl_cainfo;
  75 static long curl_low_speed_limit = -1;
  76 static long curl_low_speed_time = -1;
  77 static int curl_ftp_no_epsv;
  78 static const char *curl_http_proxy;
  79 static const char *curl_no_proxy;
  80 static const char *http_proxy_authmethod;
  81 static struct {
  82         const char *name;
  83         long curlauth_param;
  84 } proxy_authmethods[] = {
  85         { "basic", CURLAUTH_BASIC },
  86         { "digest", CURLAUTH_DIGEST },
  87         { "negotiate", CURLAUTH_GSSNEGOTIATE },
  88         { "ntlm", CURLAUTH_NTLM },
  89 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  90         { "anyauth", CURLAUTH_ANY },
  91 #endif
  92         /*
  93          * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  94          * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  95          * here, too
  96          */
  97 };
  98 #ifdef CURLGSSAPI_DELEGATION_FLAG
  99 static const char *curl_deleg;
 100 static struct {
 101         const char *name;
 102         long curl_deleg_param;
 103 } curl_deleg_levels[] = {
 104         { "none", CURLGSSAPI_DELEGATION_NONE },
 105         { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
 106         { "always", CURLGSSAPI_DELEGATION_FLAG },
 107 };
 108 #endif
 109
 110 static struct credential proxy_auth = CREDENTIAL_INIT;
 111 static const char *curl_proxyuserpwd;
 112 static const char *curl_cookie_file;
 113 static int curl_save_cookies;
 114 struct credential http_auth = CREDENTIAL_INIT;
 115 static int http_proactive_auth;
 116 static const char *user_agent;
 117 static int curl_empty_auth = -1;
 118
 119 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
 120
 121 #if LIBCURL_VERSION_NUM >= 0x071700
 122 /* Use CURLOPT_KEYPASSWD as is */
 123 #elif LIBCURL_VERSION_NUM >= 0x070903
 124 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 125 #else
 126 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 127 #endif
 128
 129 static struct credential cert_auth = CREDENTIAL_INIT;
 130 static int ssl_cert_password_required;
 131 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 132 static unsigned long http_auth_methods = CURLAUTH_ANY;
 133 static int http_auth_methods_restricted;
 134 /* Modes for which empty_auth cannot actually help us. */
 135 static unsigned long empty_auth_useless =
 136         CURLAUTH_BASIC
 137 #ifdef CURLAUTH_DIGEST_IE
 138         | CURLAUTH_DIGEST_IE
 139 #endif
 140         | CURLAUTH_DIGEST;
 141 #endif
 142
 143 static struct curl_slist *pragma_header;
 144 static struct curl_slist *no_pragma_header;
 145 static struct curl_slist *extra_http_headers;
 146
 147 static struct active_request_slot *active_queue_head;
 148
 149 static char *cached_accept_language;
 150
 151 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 152 {
 153         size_t size = eltsize * nmemb;
 154         struct buffer *buffer = buffer_;
 155
 156         if (size > buffer->buf.len - buffer->posn)
 157                 size = buffer->buf.len - buffer->posn;
 158         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 159         buffer->posn += size;
 160
 161         return size;
 162 }
 163
 164 #ifndef NO_CURL_IOCTL
 165 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 166 {
 167         struct buffer *buffer = clientp;
 168
 169         switch (cmd) {
 170         case CURLIOCMD_NOP:
 171                 return CURLIOE_OK;
 172
 173         case CURLIOCMD_RESTARTREAD:
 174                 buffer->posn = 0;
 175                 return CURLIOE_OK;
 176
 177         default:
 178                 return CURLIOE_UNKNOWNCMD;
 179         }
 180 }
 181 #endif
 182
 183 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 184 {
 185         size_t size = eltsize * nmemb;
 186         struct strbuf *buffer = buffer_;
 187
 188         strbuf_add(buffer, ptr, size);
 189         return size;
 190 }
 191
 192 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 193 {
 194         return eltsize * nmemb;
 195 }
 196
 197 static void closedown_active_slot(struct active_request_slot *slot)
 198 {
 199         active_requests--;
 200         slot->in_use = 0;
 201 }
 202
 203 static void finish_active_slot(struct active_request_slot *slot)
 204 {
 205         closedown_active_slot(slot);
 206         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 207
 208         if (slot->finished != NULL)
 209                 (*slot->finished) = 1;
 210
 211         /* Store slot results so they can be read after the slot is reused */
 212         if (slot->results != NULL) {
 213                 slot->results->curl_result = slot->curl_result;
 214                 slot->results->http_code = slot->http_code;
 215 #if LIBCURL_VERSION_NUM >= 0x070a08
 216                 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 217                                   &slot->results->auth_avail);
 218 #else
 219                 slot->results->auth_avail = 0;
 220 #endif
 221
 222                 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 223                         &slot->results->http_connectcode);
 224         }
 225
 226         /* Run callback if appropriate */
 227         if (slot->callback_func != NULL)
 228                 slot->callback_func(slot->callback_data);
 229 }
 230
 231 static void xmulti_remove_handle(struct active_request_slot *slot)
 232 {
 233 #ifdef USE_CURL_MULTI
 234         curl_multi_remove_handle(curlm, slot->curl);
 235 #endif
 236 }
 237
 238 #ifdef USE_CURL_MULTI
 239 static void process_curl_messages(void)
 240 {
 241         int num_messages;
 242         struct active_request_slot *slot;
 243         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 244
 245         while (curl_message != NULL) {
 246                 if (curl_message->msg == CURLMSG_DONE) {
 247                         int curl_result = curl_message->data.result;
 248                         slot = active_queue_head;
 249                         while (slot != NULL &&
 250                                slot->curl != curl_message->easy_handle)
 251                                 slot = slot->next;
 252                         if (slot != NULL) {
 253                                 xmulti_remove_handle(slot);
 254                                 slot->curl_result = curl_result;
 255                                 finish_active_slot(slot);
 256                         } else {
 257                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 258                         }
 259                 } else {
 260                         fprintf(stderr, "Unknown CURL message received: %d\n",
 261                                 (int)curl_message->msg);
 262                 }
 263                 curl_message = curl_multi_info_read(curlm, &num_messages);
 264         }
 265 }
 266 #endif
 267
 268 static int http_options(const char *var, const char *value, void *cb)
 269 {
 270         if (!strcmp("http.sslverify", var)) {
 271                 curl_ssl_verify = git_config_bool(var, value);
 272                 return 0;
 273         }
 274         if (!strcmp("http.sslcipherlist", var))
 275                 return git_config_string(&ssl_cipherlist, var, value);
 276         if (!strcmp("http.sslversion", var))
 277                 return git_config_string(&ssl_version, var, value);
 278         if (!strcmp("http.sslcert", var))
 279                 return git_config_pathname(&ssl_cert, var, value);
 280 #if LIBCURL_VERSION_NUM >= 0x070903
 281         if (!strcmp("http.sslkey", var))
 282                 return git_config_pathname(&ssl_key, var, value);
 283 #endif
 284 #if LIBCURL_VERSION_NUM >= 0x070908
 285         if (!strcmp("http.sslcapath", var))
 286                 return git_config_pathname(&ssl_capath, var, value);
 287 #endif
 288         if (!strcmp("http.sslcainfo", var))
 289                 return git_config_pathname(&ssl_cainfo, var, value);
 290         if (!strcmp("http.sslcertpasswordprotected", var)) {
 291                 ssl_cert_password_required = git_config_bool(var, value);
 292                 return 0;
 293         }
 294         if (!strcmp("http.ssltry", var)) {
 295                 curl_ssl_try = git_config_bool(var, value);
 296                 return 0;
 297         }
 298         if (!strcmp("http.minsessions", var)) {
 299                 min_curl_sessions = git_config_int(var, value);
 300 #ifndef USE_CURL_MULTI
 301                 if (min_curl_sessions > 1)
 302                         min_curl_sessions = 1;
 303 #endif
 304                 return 0;
 305         }
 306 #ifdef USE_CURL_MULTI
 307         if (!strcmp("http.maxrequests", var)) {
 308                 max_requests = git_config_int(var, value);
 309                 return 0;
 310         }
 311 #endif
 312         if (!strcmp("http.lowspeedlimit", var)) {
 313                 curl_low_speed_limit = (long)git_config_int(var, value);
 314                 return 0;
 315         }
 316         if (!strcmp("http.lowspeedtime", var)) {
 317                 curl_low_speed_time = (long)git_config_int(var, value);
 318                 return 0;
 319         }
 320
 321         if (!strcmp("http.noepsv", var)) {
 322                 curl_ftp_no_epsv = git_config_bool(var, value);
 323                 return 0;
 324         }
 325         if (!strcmp("http.proxy", var))
 326                 return git_config_string(&curl_http_proxy, var, value);
 327
 328         if (!strcmp("http.proxyauthmethod", var))
 329                 return git_config_string(&http_proxy_authmethod, var, value);
 330
 331         if (!strcmp("http.cookiefile", var))
 332                 return git_config_pathname(&curl_cookie_file, var, value);
 333         if (!strcmp("http.savecookies", var)) {
 334                 curl_save_cookies = git_config_bool(var, value);
 335                 return 0;
 336         }
 337
 338         if (!strcmp("http.postbuffer", var)) {
 339                 http_post_buffer = git_config_ssize_t(var, value);
 340                 if (http_post_buffer < 0)
 341                         warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
 342                 if (http_post_buffer < LARGE_PACKET_MAX)
 343                         http_post_buffer = LARGE_PACKET_MAX;
 344                 return 0;
 345         }
 346
 347         if (!strcmp("http.useragent", var))
 348                 return git_config_string(&user_agent, var, value);
 349
 350         if (!strcmp("http.emptyauth", var)) {
 351                 if (value && !strcmp("auto", value))
 352                         curl_empty_auth = -1;
 353                 else
 354                         curl_empty_auth = git_config_bool(var, value);
 355                 return 0;
 356         }
 357
 358         if (!strcmp("http.delegation", var)) {
 359 #ifdef CURLGSSAPI_DELEGATION_FLAG
 360                 return git_config_string(&curl_deleg, var, value);
 361 #else
 362                 warning(_("Delegation control is not supported with cURL < 7.22.0"));
 363                 return 0;
 364 #endif
 365         }
 366
 367         if (!strcmp("http.pinnedpubkey", var)) {
 368 #if LIBCURL_VERSION_NUM >= 0x072c00
 369                 return git_config_pathname(&ssl_pinnedkey, var, value);
 370 #else
 371                 warning(_("Public key pinning not supported with cURL < 7.44.0"));
 372                 return 0;
 373 #endif
 374         }
 375
 376         if (!strcmp("http.extraheader", var)) {
 377                 if (!value) {
 378                         return config_error_nonbool(var);
 379                 } else if (!*value) {
 380                         curl_slist_free_all(extra_http_headers);
 381                         extra_http_headers = NULL;
 382                 } else {
 383                         extra_http_headers =
 384                                 curl_slist_append(extra_http_headers, value);
 385                 }
 386                 return 0;
 387         }
 388
 389         if (!strcmp("http.followredirects", var)) {
 390                 if (value && !strcmp(value, "initial"))
 391                         http_follow_config = HTTP_FOLLOW_INITIAL;
 392                 else if (git_config_bool(var, value))
 393                         http_follow_config = HTTP_FOLLOW_ALWAYS;
 394                 else
 395                         http_follow_config = HTTP_FOLLOW_NONE;
 396                 return 0;
 397         }
 398
 399         /* Fall back on the default ones */
 400         return git_default_config(var, value, cb);
 401 }
 402
 403 static int curl_empty_auth_enabled(void)
 404 {
 405         if (curl_empty_auth >= 0)
 406                 return curl_empty_auth;
 407
 408 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
 409         /*
 410          * Our libcurl is too old to do AUTH_ANY in the first place;
 411          * just default to turning the feature off.
 412          */
 413 #else
 414         /*
 415          * In the automatic case, kick in the empty-auth
 416          * hack as long as we would potentially try some
 417          * method more exotic than "Basic" or "Digest".
 418          *
 419          * But only do this when this is our second or
 420          * subsequent request, as by then we know what
 421          * methods are available.
 422          */
 423         if (http_auth_methods_restricted &&
 424             (http_auth_methods & ~empty_auth_useless))
 425                 return 1;
 426 #endif
 427         return 0;
 428 }
 429
 430 static void init_curl_http_auth(CURL *result)
 431 {
 432         if (!http_auth.username || !*http_auth.username) {
 433                 if (curl_empty_auth_enabled())
 434                         curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 435                 return;
 436         }
 437
 438         credential_fill(&http_auth);
 439
 440 #if LIBCURL_VERSION_NUM >= 0x071301
 441         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 442         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 443 #else
 444         {
 445                 static struct strbuf up = STRBUF_INIT;
 446                 /*
 447                  * Note that we assume we only ever have a single set of
 448                  * credentials in a given program run, so we do not have
 449                  * to worry about updating this buffer, only setting its
 450                  * initial value.
 451                  */
 452                 if (!up.len)
 453                         strbuf_addf(&up, "%s:%s",
 454                                 http_auth.username, http_auth.password);
 455                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 456         }
 457 #endif
 458 }
 459
 460 /* *var must be free-able */
 461 static void var_override(const char **var, char *value)
 462 {
 463         if (value) {
 464                 free((void *)*var);
 465                 *var = xstrdup(value);
 466         }
 467 }
 468
 469 static void set_proxyauth_name_password(CURL *result)
 470 {
 471 #if LIBCURL_VERSION_NUM >= 0x071301
 472                 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 473                         proxy_auth.username);
 474                 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 475                         proxy_auth.password);
 476 #else
 477                 struct strbuf s = STRBUF_INIT;
 478
 479                 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 480                 strbuf_addch(&s, ':');
 481                 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 482                 curl_proxyuserpwd = strbuf_detach(&s, NULL);
 483                 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 484 #endif
 485 }
 486
 487 static void init_curl_proxy_auth(CURL *result)
 488 {
 489         if (proxy_auth.username) {
 490                 if (!proxy_auth.password)
 491                         credential_fill(&proxy_auth);
 492                 set_proxyauth_name_password(result);
 493         }
 494
 495         var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 496
 497 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 498         if (http_proxy_authmethod) {
 499                 int i;
 500                 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 501                         if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 502                                 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 503                                                 proxy_authmethods[i].curlauth_param);
 504                                 break;
 505                         }
 506                 }
 507                 if (i == ARRAY_SIZE(proxy_authmethods)) {
 508                         warning("unsupported proxy authentication method %s: using anyauth",
 509                                         http_proxy_authmethod);
 510                         curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 511                 }
 512         }
 513         else
 514                 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 515 #endif
 516 }
 517
 518 static int has_cert_password(void)
 519 {
 520         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 521                 return 0;
 522         if (!cert_auth.password) {
 523                 cert_auth.protocol = xstrdup("cert");
 524                 cert_auth.username = xstrdup("");
 525                 cert_auth.path = xstrdup(ssl_cert);
 526                 credential_fill(&cert_auth);
 527         }
 528         return 1;
 529 }
 530
 531 #if LIBCURL_VERSION_NUM >= 0x071900
 532 static void set_curl_keepalive(CURL *c)
 533 {
 534         curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 535 }
 536
 537 #elif LIBCURL_VERSION_NUM >= 0x071000
 538 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 539 {
 540         int ka = 1;
 541         int rc;
 542         socklen_t len = (socklen_t)sizeof(ka);
 543
 544         if (type != CURLSOCKTYPE_IPCXN)
 545                 return 0;
 546
 547         rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 548         if (rc < 0)
 549                 warning_errno("unable to set SO_KEEPALIVE on socket");
 550
 551         return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 552 }
 553
 554 static void set_curl_keepalive(CURL *c)
 555 {
 556         curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 557 }
 558
 559 #else
 560 static void set_curl_keepalive(CURL *c)
 561 {
 562         /* not supported on older curl versions */
 563 }
 564 #endif
 565
 566 static void redact_sensitive_header(struct strbuf *header)
 567 {
 568         const char *sensitive_header;
 569
 570         if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 571             skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 572                 /* The first token is the type, which is OK to log */
 573                 while (isspace(*sensitive_header))
 574                         sensitive_header++;
 575                 while (*sensitive_header && !isspace(*sensitive_header))
 576                         sensitive_header++;
 577                 /* Everything else is opaque and possibly sensitive */
 578                 strbuf_setlen(header,  sensitive_header - header->buf);
 579                 strbuf_addstr(header, " <redacted>");
 580         } else if (cookies_to_redact.nr &&
 581                    skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
 582                 struct strbuf redacted_header = STRBUF_INIT;
 583                 char *cookie;
 584
 585                 while (isspace(*sensitive_header))
 586                         sensitive_header++;
 587
 588                 /*
 589                  * The contents of header starting from sensitive_header will
 590                  * subsequently be overridden, so it is fine to mutate this
 591                  * string (hence the assignment to "char *").
 592                  */
 593                 cookie = (char *) sensitive_header;
 594
 595                 while (cookie) {
 596                         char *equals;
 597                         char *semicolon = strstr(cookie, "; ");
 598                         if (semicolon)
 599                                 *semicolon = 0;
 600                         equals = strchrnul(cookie, '=');
 601                         if (!equals) {
 602                                 /* invalid cookie, just append and continue */
 603                                 strbuf_addstr(&redacted_header, cookie);
 604                                 continue;
 605                         }
 606                         *equals = 0; /* temporarily set to NUL for lookup */
 607                         if (string_list_lookup(&cookies_to_redact, cookie)) {
 608                                 strbuf_addstr(&redacted_header, cookie);
 609                                 strbuf_addstr(&redacted_header, "=<redacted>");
 610                         } else {
 611                                 *equals = '=';
 612                                 strbuf_addstr(&redacted_header, cookie);
 613                         }
 614                         if (semicolon) {
 615                                 /*
 616                                  * There are more cookies. (Or, for some
 617                                  * reason, the input string ends in "; ".)
 618                                  */
 619                                 strbuf_addstr(&redacted_header, "; ");
 620                                 cookie = semicolon + strlen("; ");
 621                         } else {
 622                                 cookie = NULL;
 623                         }
 624                 }
 625
 626                 strbuf_setlen(header, sensitive_header - header->buf);
 627                 strbuf_addbuf(header, &redacted_header);
 628         }
 629 }
 630
 631 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 632 {
 633         struct strbuf out = STRBUF_INIT;
 634         struct strbuf **headers, **header;
 635
 636         strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 637                 text, (long)size, (long)size);
 638         trace_strbuf(&trace_curl, &out);
 639         strbuf_reset(&out);
 640         strbuf_add(&out, ptr, size);
 641         headers = strbuf_split_max(&out, '\n', 0);
 642
 643         for (header = headers; *header; header++) {
 644                 if (hide_sensitive_header)
 645                         redact_sensitive_header(*header);
 646                 strbuf_insert((*header), 0, text, strlen(text));
 647                 strbuf_insert((*header), strlen(text), ": ", 2);
 648                 strbuf_rtrim((*header));
 649                 strbuf_addch((*header), '\n');
 650                 trace_strbuf(&trace_curl, (*header));
 651         }
 652         strbuf_list_free(headers);
 653         strbuf_release(&out);
 654 }
 655
 656 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 657 {
 658         size_t i;
 659         struct strbuf out = STRBUF_INIT;
 660         unsigned int width = 60;
 661
 662         strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 663                 text, (long)size, (long)size);
 664         trace_strbuf(&trace_curl, &out);
 665
 666         for (i = 0; i < size; i += width) {
 667                 size_t w;
 668
 669                 strbuf_reset(&out);
 670                 strbuf_addf(&out, "%s: ", text);
 671                 for (w = 0; (w < width) && (i + w < size); w++) {
 672                         unsigned char ch = ptr[i + w];
 673
 674                         strbuf_addch(&out,
 675                                        (ch >= 0x20) && (ch < 0x80)
 676                                        ? ch : '.');
 677                 }
 678                 strbuf_addch(&out, '\n');
 679                 trace_strbuf(&trace_curl, &out);
 680         }
 681         strbuf_release(&out);
 682 }
 683
 684 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 685 {
 686         const char *text;
 687         enum { NO_FILTER = 0, DO_FILTER = 1 };
 688
 689         switch (type) {
 690         case CURLINFO_TEXT:
 691                 trace_printf_key(&trace_curl, "== Info: %s", data);
 692                 break;
 693         case CURLINFO_HEADER_OUT:
 694                 text = "=> Send header";
 695                 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 696                 break;
 697         case CURLINFO_DATA_OUT:
 698                 text = "=> Send data";
 699                 curl_dump_data(text, (unsigned char *)data, size);
 700                 break;
 701         case CURLINFO_SSL_DATA_OUT:
 702                 text = "=> Send SSL data";
 703                 curl_dump_data(text, (unsigned char *)data, size);
 704                 break;
 705         case CURLINFO_HEADER_IN:
 706                 text = "<= Recv header";
 707                 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 708                 break;
 709         case CURLINFO_DATA_IN:
 710                 text = "<= Recv data";
 711                 curl_dump_data(text, (unsigned char *)data, size);
 712                 break;
 713         case CURLINFO_SSL_DATA_IN:
 714                 text = "<= Recv SSL data";
 715                 curl_dump_data(text, (unsigned char *)data, size);
 716                 break;
 717
 718         default:                /* we ignore unknown types by default */
 719                 return 0;
 720         }
 721         return 0;
 722 }
 723
 724 void setup_curl_trace(CURL *handle)
 725 {
 726         if (!trace_want(&trace_curl))
 727                 return;
 728         curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 729         curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 730         curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 731 }
 732
 733 #ifdef CURLPROTO_HTTP
 734 static long get_curl_allowed_protocols(int from_user)
 735 {
 736         long allowed_protocols = 0;
 737
 738         if (is_transport_allowed("http", from_user))
 739                 allowed_protocols |= CURLPROTO_HTTP;
 740         if (is_transport_allowed("https", from_user))
 741                 allowed_protocols |= CURLPROTO_HTTPS;
 742         if (is_transport_allowed("ftp", from_user))
 743                 allowed_protocols |= CURLPROTO_FTP;
 744         if (is_transport_allowed("ftps", from_user))
 745                 allowed_protocols |= CURLPROTO_FTPS;
 746
 747         return allowed_protocols;
 748 }
 749 #endif
 750
 751 static CURL *get_curl_handle(void)
 752 {
 753         CURL *result = curl_easy_init();
 754
 755         if (!result)
 756                 die("curl_easy_init failed");
 757
 758         if (!curl_ssl_verify) {
 759                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 760                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 761         } else {
 762                 /* Verify authenticity of the peer's certificate */
 763                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 764                 /* The name in the cert must match whom we tried to connect */
 765                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 766         }
 767
 768 #if LIBCURL_VERSION_NUM >= 0x070907
 769         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 770 #endif
 771 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 772         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 773 #endif
 774
 775 #ifdef CURLGSSAPI_DELEGATION_FLAG
 776         if (curl_deleg) {
 777                 int i;
 778                 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
 779                         if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
 780                                 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
 781                                                 curl_deleg_levels[i].curl_deleg_param);
 782                                 break;
 783                         }
 784                 }
 785                 if (i == ARRAY_SIZE(curl_deleg_levels))
 786                         warning("Unknown delegation method '%s': using default",
 787                                 curl_deleg);
 788         }
 789 #endif
 790
 791         if (http_proactive_auth)
 792                 init_curl_http_auth(result);
 793
 794         if (getenv("GIT_SSL_VERSION"))
 795                 ssl_version = getenv("GIT_SSL_VERSION");
 796         if (ssl_version && *ssl_version) {
 797                 int i;
 798                 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 799                         if (!strcmp(ssl_version, sslversions[i].name)) {
 800                                 curl_easy_setopt(result, CURLOPT_SSLVERSION,
 801                                                  sslversions[i].ssl_version);
 802                                 break;
 803                         }
 804                 }
 805                 if (i == ARRAY_SIZE(sslversions))
 806                         warning("unsupported ssl version %s: using default",
 807                                 ssl_version);
 808         }
 809
 810         if (getenv("GIT_SSL_CIPHER_LIST"))
 811                 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 812         if (ssl_cipherlist != NULL && *ssl_cipherlist)
 813                 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 814                                 ssl_cipherlist);
 815
 816         if (ssl_cert != NULL)
 817                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 818         if (has_cert_password())
 819                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 820 #if LIBCURL_VERSION_NUM >= 0x070903
 821         if (ssl_key != NULL)
 822                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 823 #endif
 824 #if LIBCURL_VERSION_NUM >= 0x070908
 825         if (ssl_capath != NULL)
 826                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 827 #endif
 828 #if LIBCURL_VERSION_NUM >= 0x072c00
 829         if (ssl_pinnedkey != NULL)
 830                 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 831 #endif
 832         if (ssl_cainfo != NULL)
 833                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 834
 835         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 836                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 837                                  curl_low_speed_limit);
 838                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 839                                  curl_low_speed_time);
 840         }
 841
 842         curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 843 #if LIBCURL_VERSION_NUM >= 0x071301
 844         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 845 #elif LIBCURL_VERSION_NUM >= 0x071101
 846         curl_easy_setopt(result, CURLOPT_POST301, 1);
 847 #endif
 848 #ifdef CURLPROTO_HTTP
 849         curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
 850                          get_curl_allowed_protocols(0));
 851         curl_easy_setopt(result, CURLOPT_PROTOCOLS,
 852                          get_curl_allowed_protocols(-1));
 853 #else
 854         warning("protocol restrictions not applied to curl redirects because\n"
 855                 "your curl version is too old (>= 7.19.4)");
 856 #endif
 857         if (getenv("GIT_CURL_VERBOSE"))
 858                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
 859         setup_curl_trace(result);
 860         if (getenv("GIT_REDACT_COOKIES")) {
 861                 string_list_split(&cookies_to_redact,
 862                                   getenv("GIT_REDACT_COOKIES"), ',', -1);
 863                 string_list_sort(&cookies_to_redact);
 864         }
 865
 866         curl_easy_setopt(result, CURLOPT_USERAGENT,
 867                 user_agent ? user_agent : git_user_agent());
 868
 869         if (curl_ftp_no_epsv)
 870                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 871
 872 #ifdef CURLOPT_USE_SSL
 873         if (curl_ssl_try)
 874                 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 875 #endif
 876
 877         /*
 878          * CURL also examines these variables as a fallback; but we need to query
 879          * them here in order to decide whether to prompt for missing password (cf.
 880          * init_curl_proxy_auth()).
 881          *
 882          * Unlike many other common environment variables, these are historically
 883          * lowercase only. It appears that CURL did not know this and implemented
 884          * only uppercase variants, which was later corrected to take both - with
 885          * the exception of http_proxy, which is lowercase only also in CURL. As
 886          * the lowercase versions are the historical quasi-standard, they take
 887          * precedence here, as in CURL.
 888          */
 889         if (!curl_http_proxy) {
 890                 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
 891                         var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 892                         var_override(&curl_http_proxy, getenv("https_proxy"));
 893                 } else {
 894                         var_override(&curl_http_proxy, getenv("http_proxy"));
 895                 }
 896                 if (!curl_http_proxy) {
 897                         var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 898                         var_override(&curl_http_proxy, getenv("all_proxy"));
 899                 }
 900         }
 901
 902         if (curl_http_proxy && curl_http_proxy[0] == '\0') {
 903                 /*
 904                  * Handle case with the empty http.proxy value here to keep
 905                  * common code clean.
 906                  * NB: empty option disables proxying at all.
 907                  */
 908                 curl_easy_setopt(result, CURLOPT_PROXY, "");
 909         } else if (curl_http_proxy) {
 910 #if LIBCURL_VERSION_NUM >= 0x071800
 911                 if (starts_with(curl_http_proxy, "socks5h"))
 912                         curl_easy_setopt(result,
 913                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
 914                 else if (starts_with(curl_http_proxy, "socks5"))
 915                         curl_easy_setopt(result,
 916                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 917                 else if (starts_with(curl_http_proxy, "socks4a"))
 918                         curl_easy_setopt(result,
 919                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 920                 else if (starts_with(curl_http_proxy, "socks"))
 921                         curl_easy_setopt(result,
 922                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 923 #endif
 924 #if LIBCURL_VERSION_NUM >= 0x073400
 925                 else if (starts_with(curl_http_proxy, "https"))
 926                         curl_easy_setopt(result,
 927                                 CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
 928 #endif
 929                 if (strstr(curl_http_proxy, "://"))
 930                         credential_from_url(&proxy_auth, curl_http_proxy);
 931                 else {
 932                         struct strbuf url = STRBUF_INIT;
 933                         strbuf_addf(&url, "http://%s", curl_http_proxy);
 934                         credential_from_url(&proxy_auth, url.buf);
 935                         strbuf_release(&url);
 936                 }
 937
 938                 if (!proxy_auth.host)
 939                         die("Invalid proxy URL '%s'", curl_http_proxy);
 940
 941                 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 942 #if LIBCURL_VERSION_NUM >= 0x071304
 943                 var_override(&curl_no_proxy, getenv("NO_PROXY"));
 944                 var_override(&curl_no_proxy, getenv("no_proxy"));
 945                 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 946 #endif
 947         }
 948         init_curl_proxy_auth(result);
 949
 950         set_curl_keepalive(result);
 951
 952         return result;
 953 }
 954
 955 static void set_from_env(const char **var, const char *envname)
 956 {
 957         const char *val = getenv(envname);
 958         if (val)
 959                 *var = val;
 960 }
 961
 962 static void protocol_http_header(void)
 963 {
 964         if (get_protocol_version_config() > 0) {
 965                 struct strbuf protocol_header = STRBUF_INIT;
 966
 967                 strbuf_addf(&protocol_header, GIT_PROTOCOL_HEADER ": version=%d",
 968                             get_protocol_version_config());
 969
 970
 971                 extra_http_headers = curl_slist_append(extra_http_headers,
 972                                                        protocol_header.buf);
 973                 strbuf_release(&protocol_header);
 974         }
 975 }
 976
 977 void http_init(struct remote *remote, const char *url, int proactive_auth)
 978 {
 979         char *low_speed_limit;
 980         char *low_speed_time;
 981         char *normalized_url;
 982         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 983
 984         config.section = "http";
 985         config.key = NULL;
 986         config.collect_fn = http_options;
 987         config.cascade_fn = git_default_config;
 988         config.cb = NULL;
 989
 990         http_is_verbose = 0;
 991         normalized_url = url_normalize(url, &config.url);
 992
 993         git_config(urlmatch_config_entry, &config);
 994         free(normalized_url);
 995
 996         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 997                 die("curl_global_init failed");
 998
 999         http_proactive_auth = proactive_auth;
1000
1001         if (remote && remote->http_proxy)
1002                 curl_http_proxy = xstrdup(remote->http_proxy);
1003
1004         if (remote)
1005                 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1006
1007         protocol_http_header();
1008
1009         pragma_header = curl_slist_append(http_copy_default_headers(),
1010                 "Pragma: no-cache");
1011         no_pragma_header = curl_slist_append(http_copy_default_headers(),
1012                 "Pragma:");
1013
1014 #ifdef USE_CURL_MULTI
1015         {
1016                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1017                 if (http_max_requests != NULL)
1018                         max_requests = atoi(http_max_requests);
1019         }
1020
1021         curlm = curl_multi_init();
1022         if (!curlm)
1023                 die("curl_multi_init failed");
1024 #endif
1025
1026         if (getenv("GIT_SSL_NO_VERIFY"))
1027                 curl_ssl_verify = 0;
1028
1029         set_from_env(&ssl_cert, "GIT_SSL_CERT");
1030 #if LIBCURL_VERSION_NUM >= 0x070903
1031         set_from_env(&ssl_key, "GIT_SSL_KEY");
1032 #endif
1033 #if LIBCURL_VERSION_NUM >= 0x070908
1034         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1035 #endif
1036         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1037
1038         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1039
1040         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1041         if (low_speed_limit != NULL)
1042                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1043         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1044         if (low_speed_time != NULL)
1045                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1046
1047         if (curl_ssl_verify == -1)
1048                 curl_ssl_verify = 1;
1049
1050         curl_session_count = 0;
1051 #ifdef USE_CURL_MULTI
1052         if (max_requests < 1)
1053                 max_requests = DEFAULT_MAX_REQUESTS;
1054 #endif
1055
1056         if (getenv("GIT_CURL_FTP_NO_EPSV"))
1057                 curl_ftp_no_epsv = 1;
1058
1059         if (url) {
1060                 credential_from_url(&http_auth, url);
1061                 if (!ssl_cert_password_required &&
1062                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1063                     starts_with(url, "https://"))
1064                         ssl_cert_password_required = 1;
1065         }
1066
1067 #ifndef NO_CURL_EASY_DUPHANDLE
1068         curl_default = get_curl_handle();
1069 #endif
1070 }
1071
1072 void http_cleanup(void)
1073 {
1074         struct active_request_slot *slot = active_queue_head;
1075
1076         while (slot != NULL) {
1077                 struct active_request_slot *next = slot->next;
1078                 if (slot->curl != NULL) {
1079                         xmulti_remove_handle(slot);
1080                         curl_easy_cleanup(slot->curl);
1081                 }
1082                 free(slot);
1083                 slot = next;
1084         }
1085         active_queue_head = NULL;
1086
1087 #ifndef NO_CURL_EASY_DUPHANDLE
1088         curl_easy_cleanup(curl_default);
1089 #endif
1090
1091 #ifdef USE_CURL_MULTI
1092         curl_multi_cleanup(curlm);
1093 #endif
1094         curl_global_cleanup();
1095
1096         curl_slist_free_all(extra_http_headers);
1097         extra_http_headers = NULL;
1098
1099         curl_slist_free_all(pragma_header);
1100         pragma_header = NULL;
1101
1102         curl_slist_free_all(no_pragma_header);
1103         no_pragma_header = NULL;
1104
1105         if (curl_http_proxy) {
1106                 free((void *)curl_http_proxy);
1107                 curl_http_proxy = NULL;
1108         }
1109
1110         if (proxy_auth.password) {
1111                 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1112                 FREE_AND_NULL(proxy_auth.password);
1113         }
1114
1115         free((void *)curl_proxyuserpwd);
1116         curl_proxyuserpwd = NULL;
1117
1118         free((void *)http_proxy_authmethod);
1119         http_proxy_authmethod = NULL;
1120
1121         if (cert_auth.password != NULL) {
1122                 memset(cert_auth.password, 0, strlen(cert_auth.password));
1123                 FREE_AND_NULL(cert_auth.password);
1124         }
1125         ssl_cert_password_required = 0;
1126
1127         FREE_AND_NULL(cached_accept_language);
1128 }
1129
1130 struct active_request_slot *get_active_slot(void)
1131 {
1132         struct active_request_slot *slot = active_queue_head;
1133         struct active_request_slot *newslot;
1134
1135 #ifdef USE_CURL_MULTI
1136         int num_transfers;
1137
1138         /* Wait for a slot to open up if the queue is full */
1139         while (active_requests >= max_requests) {
1140                 curl_multi_perform(curlm, &num_transfers);
1141                 if (num_transfers < active_requests)
1142                         process_curl_messages();
1143         }
1144 #endif
1145
1146         while (slot != NULL && slot->in_use)
1147                 slot = slot->next;
1148
1149         if (slot == NULL) {
1150                 newslot = xmalloc(sizeof(*newslot));
1151                 newslot->curl = NULL;
1152                 newslot->in_use = 0;
1153                 newslot->next = NULL;
1154
1155                 slot = active_queue_head;
1156                 if (slot == NULL) {
1157                         active_queue_head = newslot;
1158                 } else {
1159                         while (slot->next != NULL)
1160                                 slot = slot->next;
1161                         slot->next = newslot;
1162                 }
1163                 slot = newslot;
1164         }
1165
1166         if (slot->curl == NULL) {
1167 #ifdef NO_CURL_EASY_DUPHANDLE
1168                 slot->curl = get_curl_handle();
1169 #else
1170                 slot->curl = curl_easy_duphandle(curl_default);
1171 #endif
1172                 curl_session_count++;
1173         }
1174
1175         active_requests++;
1176         slot->in_use = 1;
1177         slot->results = NULL;
1178         slot->finished = NULL;
1179         slot->callback_data = NULL;
1180         slot->callback_func = NULL;
1181         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1182         if (curl_save_cookies)
1183                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1184         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1185         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1186         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1187         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1188         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1189         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1190         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1191         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1192         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1193         curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1194
1195         /*
1196          * Default following to off unless "ALWAYS" is configured; this gives
1197          * callers a sane starting point, and they can tweak for individual
1198          * HTTP_FOLLOW_* cases themselves.
1199          */
1200         if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1201                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1202         else
1203                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1204
1205 #if LIBCURL_VERSION_NUM >= 0x070a08
1206         curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1207 #endif
1208 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1209         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1210 #endif
1211         if (http_auth.password || curl_empty_auth_enabled())
1212                 init_curl_http_auth(slot->curl);
1213
1214         return slot;
1215 }
1216
1217 int start_active_slot(struct active_request_slot *slot)
1218 {
1219 #ifdef USE_CURL_MULTI
1220         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1221         int num_transfers;
1222
1223         if (curlm_result != CURLM_OK &&
1224             curlm_result != CURLM_CALL_MULTI_PERFORM) {
1225                 warning("curl_multi_add_handle failed: %s",
1226                         curl_multi_strerror(curlm_result));
1227                 active_requests--;
1228                 slot->in_use = 0;
1229                 return 0;
1230         }
1231
1232         /*
1233          * We know there must be something to do, since we just added
1234          * something.
1235          */
1236         curl_multi_perform(curlm, &num_transfers);
1237 #endif
1238         return 1;
1239 }
1240
1241 #ifdef USE_CURL_MULTI
1242 struct fill_chain {
1243         void *data;
1244         int (*fill)(void *);
1245         struct fill_chain *next;
1246 };
1247
1248 static struct fill_chain *fill_cfg;
1249
1250 void add_fill_function(void *data, int (*fill)(void *))
1251 {
1252         struct fill_chain *new = xmalloc(sizeof(*new));
1253         struct fill_chain **linkp = &fill_cfg;
1254         new->data = data;
1255         new->fill = fill;
1256         new->next = NULL;
1257         while (*linkp)
1258                 linkp = &(*linkp)->next;
1259         *linkp = new;
1260 }
1261
1262 void fill_active_slots(void)
1263 {
1264         struct active_request_slot *slot = active_queue_head;
1265
1266         while (active_requests < max_requests) {
1267                 struct fill_chain *fill;
1268                 for (fill = fill_cfg; fill; fill = fill->next)
1269                         if (fill->fill(fill->data))
1270                                 break;
1271
1272                 if (!fill)
1273                         break;
1274         }
1275
1276         while (slot != NULL) {
1277                 if (!slot->in_use && slot->curl != NULL
1278                         && curl_session_count > min_curl_sessions) {
1279                         curl_easy_cleanup(slot->curl);
1280                         slot->curl = NULL;
1281                         curl_session_count--;
1282                 }
1283                 slot = slot->next;
1284         }
1285 }
1286
1287 void step_active_slots(void)
1288 {
1289         int num_transfers;
1290         CURLMcode curlm_result;
1291
1292         do {
1293                 curlm_result = curl_multi_perform(curlm, &num_transfers);
1294         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1295         if (num_transfers < active_requests) {
1296                 process_curl_messages();
1297                 fill_active_slots();
1298         }
1299 }
1300 #endif
1301
1302 void run_active_slot(struct active_request_slot *slot)
1303 {
1304 #ifdef USE_CURL_MULTI
1305         fd_set readfds;
1306         fd_set writefds;
1307         fd_set excfds;
1308         int max_fd;
1309         struct timeval select_timeout;
1310         int finished = 0;
1311
1312         slot->finished = &finished;
1313         while (!finished) {
1314                 step_active_slots();
1315
1316                 if (slot->in_use) {
1317 #if LIBCURL_VERSION_NUM >= 0x070f04
1318                         long curl_timeout;
1319                         curl_multi_timeout(curlm, &curl_timeout);
1320                         if (curl_timeout == 0) {
1321                                 continue;
1322                         } else if (curl_timeout == -1) {
1323                                 select_timeout.tv_sec  = 0;
1324                                 select_timeout.tv_usec = 50000;
1325                         } else {
1326                                 select_timeout.tv_sec  =  curl_timeout / 1000;
1327                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1328                         }
1329 #else
1330                         select_timeout.tv_sec  = 0;
1331                         select_timeout.tv_usec = 50000;
1332 #endif
1333
1334                         max_fd = -1;
1335                         FD_ZERO(&readfds);
1336                         FD_ZERO(&writefds);
1337                         FD_ZERO(&excfds);
1338                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1339
1340                         /*
1341                          * It can happen that curl_multi_timeout returns a pathologically
1342                          * long timeout when curl_multi_fdset returns no file descriptors
1343                          * to read.  See commit message for more details.
1344                          */
1345                         if (max_fd < 0 &&
1346                             (select_timeout.tv_sec > 0 ||
1347                              select_timeout.tv_usec > 50000)) {
1348                                 select_timeout.tv_sec  = 0;
1349                                 select_timeout.tv_usec = 50000;
1350                         }
1351
1352                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1353                 }
1354         }
1355 #else
1356         while (slot->in_use) {
1357                 slot->curl_result = curl_easy_perform(slot->curl);
1358                 finish_active_slot(slot);
1359         }
1360 #endif
1361 }
1362
1363 static void release_active_slot(struct active_request_slot *slot)
1364 {
1365         closedown_active_slot(slot);
1366         if (slot->curl) {
1367                 xmulti_remove_handle(slot);
1368                 if (curl_session_count > min_curl_sessions) {
1369                         curl_easy_cleanup(slot->curl);
1370                         slot->curl = NULL;
1371                         curl_session_count--;
1372                 }
1373         }
1374 #ifdef USE_CURL_MULTI
1375         fill_active_slots();
1376 #endif
1377 }
1378
1379 void finish_all_active_slots(void)
1380 {
1381         struct active_request_slot *slot = active_queue_head;
1382
1383         while (slot != NULL)
1384                 if (slot->in_use) {
1385                         run_active_slot(slot);
1386                         slot = active_queue_head;
1387                 } else {
1388                         slot = slot->next;
1389                 }
1390 }
1391
1392 /* Helpers for modifying and creating URLs */
1393 static inline int needs_quote(int ch)
1394 {
1395         if (((ch >= 'A') && (ch <= 'Z'))
1396                         || ((ch >= 'a') && (ch <= 'z'))
1397                         || ((ch >= '0') && (ch <= '9'))
1398                         || (ch == '/')
1399                         || (ch == '-')
1400                         || (ch == '.'))
1401                 return 0;
1402         return 1;
1403 }
1404
1405 static char *quote_ref_url(const char *base, const char *ref)
1406 {
1407         struct strbuf buf = STRBUF_INIT;
1408         const char *cp;
1409         int ch;
1410
1411         end_url_with_slash(&buf, base);
1412
1413         for (cp = ref; (ch = *cp) != 0; cp++)
1414                 if (needs_quote(ch))
1415                         strbuf_addf(&buf, "%%%02x", ch);
1416                 else
1417                         strbuf_addch(&buf, *cp);
1418
1419         return strbuf_detach(&buf, NULL);
1420 }
1421
1422 void append_remote_object_url(struct strbuf *buf, const char *url,
1423                               const char *hex,
1424                               int only_two_digit_prefix)
1425 {
1426         end_url_with_slash(buf, url);
1427
1428         strbuf_addf(buf, "objects/%.*s/", 2, hex);
1429         if (!only_two_digit_prefix)
1430                 strbuf_addstr(buf, hex + 2);
1431 }
1432
1433 char *get_remote_object_url(const char *url, const char *hex,
1434                             int only_two_digit_prefix)
1435 {
1436         struct strbuf buf = STRBUF_INIT;
1437         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1438         return strbuf_detach(&buf, NULL);
1439 }
1440
1441 static int handle_curl_result(struct slot_results *results)
1442 {
1443         /*
1444          * If we see a failing http code with CURLE_OK, we have turned off
1445          * FAILONERROR (to keep the server's custom error response), and should
1446          * translate the code into failure here.
1447          *
1448          * Likewise, if we see a redirect (30x code), that means we turned off
1449          * redirect-following, and we should treat the result as an error.
1450          */
1451         if (results->curl_result == CURLE_OK &&
1452             results->http_code >= 300) {
1453                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1454                 /*
1455                  * Normally curl will already have put the "reason phrase"
1456                  * from the server into curl_errorstr; unfortunately without
1457                  * FAILONERROR it is lost, so we can give only the numeric
1458                  * status code.
1459                  */
1460                 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1461                           "The requested URL returned error: %ld",
1462                           results->http_code);
1463         }
1464
1465         if (results->curl_result == CURLE_OK) {
1466                 credential_approve(&http_auth);
1467                 if (proxy_auth.password)
1468                         credential_approve(&proxy_auth);
1469                 return HTTP_OK;
1470         } else if (missing_target(results))
1471                 return HTTP_MISSING_TARGET;
1472         else if (results->http_code == 401) {
1473                 if (http_auth.username && http_auth.password) {
1474                         credential_reject(&http_auth);
1475                         return HTTP_NOAUTH;
1476                 } else {
1477 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1478                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1479                         if (results->auth_avail) {
1480                                 http_auth_methods &= results->auth_avail;
1481                                 http_auth_methods_restricted = 1;
1482                         }
1483 #endif
1484                         return HTTP_REAUTH;
1485                 }
1486         } else {
1487                 if (results->http_connectcode == 407)
1488                         credential_reject(&proxy_auth);
1489 #if LIBCURL_VERSION_NUM >= 0x070c00
1490                 if (!curl_errorstr[0])
1491                         strlcpy(curl_errorstr,
1492                                 curl_easy_strerror(results->curl_result),
1493                                 sizeof(curl_errorstr));
1494 #endif
1495                 return HTTP_ERROR;
1496         }
1497 }
1498
1499 int run_one_slot(struct active_request_slot *slot,
1500                  struct slot_results *results)
1501 {
1502         slot->results = results;
1503         if (!start_active_slot(slot)) {
1504                 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1505                           "failed to start HTTP request");
1506                 return HTTP_START_FAILED;
1507         }
1508
1509         run_active_slot(slot);
1510         return handle_curl_result(results);
1511 }
1512
1513 struct curl_slist *http_copy_default_headers(void)
1514 {
1515         struct curl_slist *headers = NULL, *h;
1516
1517         for (h = extra_http_headers; h; h = h->next)
1518                 headers = curl_slist_append(headers, h->data);
1519
1520         return headers;
1521 }
1522
1523 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1524 {
1525         char *ptr;
1526         CURLcode ret;
1527
1528         strbuf_reset(buf);
1529         ret = curl_easy_getinfo(curl, info, &ptr);
1530         if (!ret && ptr)
1531                 strbuf_addstr(buf, ptr);
1532         return ret;
1533 }
1534
1535 /*
1536  * Check for and extract a content-type parameter. "raw"
1537  * should be positioned at the start of the potential
1538  * parameter, with any whitespace already removed.
1539  *
1540  * "name" is the name of the parameter. The value is appended
1541  * to "out".
1542  */
1543 static int extract_param(const char *raw, const char *name,
1544                          struct strbuf *out)
1545 {
1546         size_t len = strlen(name);
1547
1548         if (strncasecmp(raw, name, len))
1549                 return -1;
1550         raw += len;
1551
1552         if (*raw != '=')
1553                 return -1;
1554         raw++;
1555
1556         while (*raw && !isspace(*raw) && *raw != ';')
1557                 strbuf_addch(out, *raw++);
1558         return 0;
1559 }
1560
1561 /*
1562  * Extract a normalized version of the content type, with any
1563  * spaces suppressed, all letters lowercased, and no trailing ";"
1564  * or parameters.
1565  *
1566  * Note that we will silently remove even invalid whitespace. For
1567  * example, "text / plain" is specifically forbidden by RFC 2616,
1568  * but "text/plain" is the only reasonable output, and this keeps
1569  * our code simple.
1570  *
1571  * If the "charset" argument is not NULL, store the value of any
1572  * charset parameter there.
1573  *
1574  * Example:
1575  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1576  *   "text / plain" -> "text/plain"
1577  */
1578 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1579                                  struct strbuf *charset)
1580 {
1581         const char *p;
1582
1583         strbuf_reset(type);
1584         strbuf_grow(type, raw->len);
1585         for (p = raw->buf; *p; p++) {
1586                 if (isspace(*p))
1587                         continue;
1588                 if (*p == ';') {
1589                         p++;
1590                         break;
1591                 }
1592                 strbuf_addch(type, tolower(*p));
1593         }
1594
1595         if (!charset)
1596                 return;
1597
1598         strbuf_reset(charset);
1599         while (*p) {
1600                 while (isspace(*p) || *p == ';')
1601                         p++;
1602                 if (!extract_param(p, "charset", charset))
1603                         return;
1604                 while (*p && !isspace(*p))
1605                         p++;
1606         }
1607
1608         if (!charset->len && starts_with(type->buf, "text/"))
1609                 strbuf_addstr(charset, "ISO-8859-1");
1610 }
1611
1612 static void write_accept_language(struct strbuf *buf)
1613 {
1614         /*
1615          * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1616          * that, q-value will be smaller than 0.001, the minimum q-value the
1617          * HTTP specification allows. See
1618          * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1619          */
1620         const int MAX_DECIMAL_PLACES = 3;
1621         const int MAX_LANGUAGE_TAGS = 1000;
1622         const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1623         char **language_tags = NULL;
1624         int num_langs = 0;
1625         const char *s = get_preferred_languages();
1626         int i;
1627         struct strbuf tag = STRBUF_INIT;
1628
1629         /* Don't add Accept-Language header if no language is preferred. */
1630         if (!s)
1631                 return;
1632
1633         /*
1634          * Split the colon-separated string of preferred languages into
1635          * language_tags array.
1636          */
1637         do {
1638                 /* collect language tag */
1639                 for (; *s && (isalnum(*s) || *s == '_'); s++)
1640                         strbuf_addch(&tag, *s == '_' ? '-' : *s);
1641
1642                 /* skip .codeset, @modifier and any other unnecessary parts */
1643                 while (*s && *s != ':')
1644                         s++;
1645
1646                 if (tag.len) {
1647                         num_langs++;
1648                         REALLOC_ARRAY(language_tags, num_langs);
1649                         language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1650                         if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1651                                 break;
1652                 }
1653         } while (*s++);
1654
1655         /* write Accept-Language header into buf */
1656         if (num_langs) {
1657                 int last_buf_len = 0;
1658                 int max_q;
1659                 int decimal_places;
1660                 char q_format[32];
1661
1662                 /* add '*' */
1663                 REALLOC_ARRAY(language_tags, num_langs + 1);
1664                 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1665
1666                 /* compute decimal_places */
1667                 for (max_q = 1, decimal_places = 0;
1668                      max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1669                      decimal_places++, max_q *= 10)
1670                         ;
1671
1672                 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1673
1674                 strbuf_addstr(buf, "Accept-Language: ");
1675
1676                 for (i = 0; i < num_langs; i++) {
1677                         if (i > 0)
1678                                 strbuf_addstr(buf, ", ");
1679
1680                         strbuf_addstr(buf, language_tags[i]);
1681
1682                         if (i > 0)
1683                                 strbuf_addf(buf, q_format, max_q - i);
1684
1685                         if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1686                                 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1687                                 break;
1688                         }
1689
1690                         last_buf_len = buf->len;
1691                 }
1692         }
1693
1694         /* free language tags -- last one is a static '*' */
1695         for (i = 0; i < num_langs - 1; i++)
1696                 free(language_tags[i]);
1697         free(language_tags);
1698 }
1699
1700 /*
1701  * Get an Accept-Language header which indicates user's preferred languages.
1702  *
1703  * Examples:
1704  *   LANGUAGE= -> ""
1705  *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1706  *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1707  *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1708  *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1709  *   LANGUAGE= LANG=C -> ""
1710  */
1711 static const char *get_accept_language(void)
1712 {
1713         if (!cached_accept_language) {
1714                 struct strbuf buf = STRBUF_INIT;
1715                 write_accept_language(&buf);
1716                 if (buf.len > 0)
1717                         cached_accept_language = strbuf_detach(&buf, NULL);
1718         }
1719
1720         return cached_accept_language;
1721 }
1722
1723 static void http_opt_request_remainder(CURL *curl, off_t pos)
1724 {
1725         char buf[128];
1726         xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1727         curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1728 }
1729
1730 /* http_request() targets */
1731 #define HTTP_REQUEST_STRBUF     0
1732 #define HTTP_REQUEST_FILE       1
1733
1734 static int http_request(const char *url,
1735                         void *result, int target,
1736                         const struct http_get_options *options)
1737 {
1738         struct active_request_slot *slot;
1739         struct slot_results results;
1740         struct curl_slist *headers = http_copy_default_headers();
1741         struct strbuf buf = STRBUF_INIT;
1742         const char *accept_language;
1743         int ret;
1744
1745         slot = get_active_slot();
1746         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1747
1748         if (result == NULL) {
1749                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1750         } else {
1751                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1752                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1753
1754                 if (target == HTTP_REQUEST_FILE) {
1755                         off_t posn = ftello(result);
1756                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1757                                          fwrite);
1758                         if (posn > 0)
1759                                 http_opt_request_remainder(slot->curl, posn);
1760                 } else
1761                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1762                                          fwrite_buffer);
1763         }
1764
1765         accept_language = get_accept_language();
1766
1767         if (accept_language)
1768                 headers = curl_slist_append(headers, accept_language);
1769
1770         strbuf_addstr(&buf, "Pragma:");
1771         if (options && options->no_cache)
1772                 strbuf_addstr(&buf, " no-cache");
1773         if (options && options->keep_error)
1774                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1775         if (options && options->initial_request &&
1776             http_follow_config == HTTP_FOLLOW_INITIAL)
1777                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1778
1779         headers = curl_slist_append(headers, buf.buf);
1780
1781         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1782         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1783         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1784
1785         ret = run_one_slot(slot, &results);
1786
1787         if (options && options->content_type) {
1788                 struct strbuf raw = STRBUF_INIT;
1789                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1790                 extract_content_type(&raw, options->content_type,
1791                                      options->charset);
1792                 strbuf_release(&raw);
1793         }
1794
1795         if (options && options->effective_url)
1796                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1797                                 options->effective_url);
1798
1799         curl_slist_free_all(headers);
1800         strbuf_release(&buf);
1801
1802         return ret;
1803 }
1804
1805 /*
1806  * Update the "base" url to a more appropriate value, as deduced by
1807  * redirects seen when requesting a URL starting with "url".
1808  *
1809  * The "asked" parameter is a URL that we asked curl to access, and must begin
1810  * with "base".
1811  *
1812  * The "got" parameter is the URL that curl reported to us as where we ended
1813  * up.
1814  *
1815  * Returns 1 if we updated the base url, 0 otherwise.
1816  *
1817  * Our basic strategy is to compare "base" and "asked" to find the bits
1818  * specific to our request. We then strip those bits off of "got" to yield the
1819  * new base. So for example, if our base is "http://example.com/foo.git",
1820  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1821  * with "https://other.example.com/foo.git/info/refs". We would want the
1822  * new URL to become "https://other.example.com/foo.git".
1823  *
1824  * Note that this assumes a sane redirect scheme. It's entirely possible
1825  * in the example above to end up at a URL that does not even end in
1826  * "info/refs".  In such a case we die. There's not much we can do, such a
1827  * scheme is unlikely to represent a real git repository, and failing to
1828  * rewrite the base opens options for malicious redirects to do funny things.
1829  */
1830 static int update_url_from_redirect(struct strbuf *base,
1831                                     const char *asked,
1832                                     const struct strbuf *got)
1833 {
1834         const char *tail;
1835         size_t new_len;
1836
1837         if (!strcmp(asked, got->buf))
1838                 return 0;
1839
1840         if (!skip_prefix(asked, base->buf, &tail))
1841                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1842                     asked, base->buf);
1843
1844         new_len = got->len;
1845         if (!strip_suffix_mem(got->buf, &new_len, tail))
1846                 die(_("unable to update url base from redirection:\n"
1847                       "  asked for: %s\n"
1848                       "   redirect: %s"),
1849                     asked, got->buf);
1850
1851         strbuf_reset(base);
1852         strbuf_add(base, got->buf, new_len);
1853
1854         return 1;
1855 }
1856
1857 static int http_request_reauth(const char *url,
1858                                void *result, int target,
1859                                struct http_get_options *options)
1860 {
1861         int ret = http_request(url, result, target, options);
1862
1863         if (ret != HTTP_OK && ret != HTTP_REAUTH)
1864                 return ret;
1865
1866         if (options && options->effective_url && options->base_url) {
1867                 if (update_url_from_redirect(options->base_url,
1868                                              url, options->effective_url)) {
1869                         credential_from_url(&http_auth, options->base_url->buf);
1870                         url = options->effective_url->buf;
1871                 }
1872         }
1873
1874         if (ret != HTTP_REAUTH)
1875                 return ret;
1876
1877         /*
1878          * If we are using KEEP_ERROR, the previous request may have
1879          * put cruft into our output stream; we should clear it out before
1880          * making our next request. We only know how to do this for
1881          * the strbuf case, but that is enough to satisfy current callers.
1882          */
1883         if (options && options->keep_error) {
1884                 switch (target) {
1885                 case HTTP_REQUEST_STRBUF:
1886                         strbuf_reset(result);
1887                         break;
1888                 default:
1889                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1890                 }
1891         }
1892
1893         credential_fill(&http_auth);
1894
1895         return http_request(url, result, target, options);
1896 }
1897
1898 int http_get_strbuf(const char *url,
1899                     struct strbuf *result,
1900                     struct http_get_options *options)
1901 {
1902         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1903 }
1904
1905 /*
1906  * Downloads a URL and stores the result in the given file.
1907  *
1908  * If a previous interrupted download is detected (i.e. a previous temporary
1909  * file is still around) the download is resumed.
1910  */
1911 static int http_get_file(const char *url, const char *filename,
1912                          struct http_get_options *options)
1913 {
1914         int ret;
1915         struct strbuf tmpfile = STRBUF_INIT;
1916         FILE *result;
1917
1918         strbuf_addf(&tmpfile, "%s.temp", filename);
1919         result = fopen(tmpfile.buf, "a");
1920         if (!result) {
1921                 error("Unable to open local file %s", tmpfile.buf);
1922                 ret = HTTP_ERROR;
1923                 goto cleanup;
1924         }
1925
1926         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1927         fclose(result);
1928
1929         if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1930                 ret = HTTP_ERROR;
1931 cleanup:
1932         strbuf_release(&tmpfile);
1933         return ret;
1934 }
1935
1936 int http_fetch_ref(const char *base, struct ref *ref)
1937 {
1938         struct http_get_options options = {0};
1939         char *url;
1940         struct strbuf buffer = STRBUF_INIT;
1941         int ret = -1;
1942
1943         options.no_cache = 1;
1944
1945         url = quote_ref_url(base, ref->name);
1946         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1947                 strbuf_rtrim(&buffer);
1948                 if (buffer.len == 40)
1949                         ret = get_oid_hex(buffer.buf, &ref->old_oid);
1950                 else if (starts_with(buffer.buf, "ref: ")) {
1951                         ref->symref = xstrdup(buffer.buf + 5);
1952                         ret = 0;
1953                 }
1954         }
1955
1956         strbuf_release(&buffer);
1957         free(url);
1958         return ret;
1959 }
1960
1961 /* Helpers for fetching packs */
1962 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1963 {
1964         char *url, *tmp;
1965         struct strbuf buf = STRBUF_INIT;
1966
1967         if (http_is_verbose)
1968                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1969
1970         end_url_with_slash(&buf, base_url);
1971         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1972         url = strbuf_detach(&buf, NULL);
1973
1974         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1975         tmp = strbuf_detach(&buf, NULL);
1976
1977         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1978                 error("Unable to get pack index %s", url);
1979                 FREE_AND_NULL(tmp);
1980         }
1981
1982         free(url);
1983         return tmp;
1984 }
1985
1986 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1987         unsigned char *sha1, const char *base_url)
1988 {
1989         struct packed_git *new_pack;
1990         char *tmp_idx = NULL;
1991         int ret;
1992
1993         if (has_pack_index(sha1)) {
1994                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1995                 if (!new_pack)
1996                         return -1; /* parse_pack_index() already issued error message */
1997                 goto add_pack;
1998         }
1999
2000         tmp_idx = fetch_pack_index(sha1, base_url);
2001         if (!tmp_idx)
2002                 return -1;
2003
2004         new_pack = parse_pack_index(sha1, tmp_idx);
2005         if (!new_pack) {
2006                 unlink(tmp_idx);
2007                 free(tmp_idx);
2008
2009                 return -1; /* parse_pack_index() already issued error message */
2010         }
2011
2012         ret = verify_pack_index(new_pack);
2013         if (!ret) {
2014                 close_pack_index(new_pack);
2015                 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2016         }
2017         free(tmp_idx);
2018         if (ret)
2019                 return -1;
2020
2021 add_pack:
2022         new_pack->next = *packs_head;
2023         *packs_head = new_pack;
2024         return 0;
2025 }
2026
2027 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2028 {
2029         struct http_get_options options = {0};
2030         int ret = 0, i = 0;
2031         char *url, *data;
2032         struct strbuf buf = STRBUF_INIT;
2033         unsigned char sha1[20];
2034
2035         end_url_with_slash(&buf, base_url);
2036         strbuf_addstr(&buf, "objects/info/packs");
2037         url = strbuf_detach(&buf, NULL);
2038
2039         options.no_cache = 1;
2040         ret = http_get_strbuf(url, &buf, &options);
2041         if (ret != HTTP_OK)
2042                 goto cleanup;
2043
2044         data = buf.buf;
2045         while (i < buf.len) {
2046                 switch (data[i]) {
2047                 case 'P':
2048                         i++;
2049                         if (i + 52 <= buf.len &&
2050                             starts_with(data + i, " pack-") &&
2051                             starts_with(data + i + 46, ".pack\n")) {
2052                                 get_sha1_hex(data + i + 6, sha1);
2053                                 fetch_and_setup_pack_index(packs_head, sha1,
2054                                                       base_url);
2055                                 i += 51;
2056                                 break;
2057                         }
2058                 default:
2059                         while (i < buf.len && data[i] != '\n')
2060                                 i++;
2061                 }
2062                 i++;
2063         }
2064
2065 cleanup:
2066         free(url);
2067         return ret;
2068 }
2069
2070 void release_http_pack_request(struct http_pack_request *preq)
2071 {
2072         if (preq->packfile != NULL) {
2073                 fclose(preq->packfile);
2074                 preq->packfile = NULL;
2075         }
2076         preq->slot = NULL;
2077         free(preq->url);
2078         free(preq);
2079 }
2080
2081 int finish_http_pack_request(struct http_pack_request *preq)
2082 {
2083         struct packed_git **lst;
2084         struct packed_git *p = preq->target;
2085         char *tmp_idx;
2086         size_t len;
2087         struct child_process ip = CHILD_PROCESS_INIT;
2088
2089         close_pack_index(p);
2090
2091         fclose(preq->packfile);
2092         preq->packfile = NULL;
2093
2094         lst = preq->lst;
2095         while (*lst != p)
2096                 lst = &((*lst)->next);
2097         *lst = (*lst)->next;
2098
2099         if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2100                 die("BUG: pack tmpfile does not end in .pack.temp?");
2101         tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2102
2103         argv_array_push(&ip.args, "index-pack");
2104         argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2105         argv_array_push(&ip.args, preq->tmpfile);
2106         ip.git_cmd = 1;
2107         ip.no_stdin = 1;
2108         ip.no_stdout = 1;
2109
2110         if (run_command(&ip)) {
2111                 unlink(preq->tmpfile);
2112                 unlink(tmp_idx);
2113                 free(tmp_idx);
2114                 return -1;
2115         }
2116
2117         unlink(sha1_pack_index_name(p->sha1));
2118
2119         if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2120          || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2121                 free(tmp_idx);
2122                 return -1;
2123         }
2124
2125         install_packed_git(p);
2126         free(tmp_idx);
2127         return 0;
2128 }
2129
2130 struct http_pack_request *new_http_pack_request(
2131         struct packed_git *target, const char *base_url)
2132 {
2133         off_t prev_posn = 0;
2134         struct strbuf buf = STRBUF_INIT;
2135         struct http_pack_request *preq;
2136
2137         preq = xcalloc(1, sizeof(*preq));
2138         preq->target = target;
2139
2140         end_url_with_slash(&buf, base_url);
2141         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2142                 sha1_to_hex(target->sha1));
2143         preq->url = strbuf_detach(&buf, NULL);
2144
2145         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2146                 sha1_pack_name(target->sha1));
2147         preq->packfile = fopen(preq->tmpfile, "a");
2148         if (!preq->packfile) {
2149                 error("Unable to open local file %s for pack",
2150                       preq->tmpfile);
2151                 goto abort;
2152         }
2153
2154         preq->slot = get_active_slot();
2155         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2156         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2157         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2158         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2159                 no_pragma_header);
2160
2161         /*
2162          * If there is data present from a previous transfer attempt,
2163          * resume where it left off
2164          */
2165         prev_posn = ftello(preq->packfile);
2166         if (prev_posn>0) {
2167                 if (http_is_verbose)
2168                         fprintf(stderr,
2169                                 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2170                                 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2171                 http_opt_request_remainder(preq->slot->curl, prev_posn);
2172         }
2173
2174         return preq;
2175
2176 abort:
2177         free(preq->url);
2178         free(preq);
2179         return NULL;
2180 }
2181
2182 /* Helpers for fetching objects (loose) */
2183 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2184                                void *data)
2185 {
2186         unsigned char expn[4096];
2187         size_t size = eltsize * nmemb;
2188         int posn = 0;
2189         struct http_object_request *freq = data;
2190         struct active_request_slot *slot = freq->slot;
2191
2192         if (slot) {
2193                 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2194                                                 &slot->http_code);
2195                 if (c != CURLE_OK)
2196                         die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2197                                 curl_easy_strerror(c));
2198                 if (slot->http_code >= 300)
2199                         return size;
2200         }
2201
2202         do {
2203                 ssize_t retval = xwrite(freq->localfile,
2204                                         (char *) ptr + posn, size - posn);
2205                 if (retval < 0)
2206                         return posn;
2207                 posn += retval;
2208         } while (posn < size);
2209
2210         freq->stream.avail_in = size;
2211         freq->stream.next_in = (void *)ptr;
2212         do {
2213                 freq->stream.next_out = expn;
2214                 freq->stream.avail_out = sizeof(expn);
2215                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2216                 git_SHA1_Update(&freq->c, expn,
2217                                 sizeof(expn) - freq->stream.avail_out);
2218         } while (freq->stream.avail_in && freq->zret == Z_OK);
2219         return size;
2220 }
2221
2222 struct http_object_request *new_http_object_request(const char *base_url,
2223         unsigned char *sha1)
2224 {
2225         char *hex = sha1_to_hex(sha1);
2226         const char *filename;
2227         char prevfile[PATH_MAX];
2228         int prevlocal;
2229         char prev_buf[PREV_BUF_SIZE];
2230         ssize_t prev_read = 0;
2231         off_t prev_posn = 0;
2232         struct http_object_request *freq;
2233
2234         freq = xcalloc(1, sizeof(*freq));
2235         hashcpy(freq->sha1, sha1);
2236         freq->localfile = -1;
2237
2238         filename = sha1_file_name(sha1);
2239         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2240                  "%s.temp", filename);
2241
2242         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2243         unlink_or_warn(prevfile);
2244         rename(freq->tmpfile, prevfile);
2245         unlink_or_warn(freq->tmpfile);
2246
2247         if (freq->localfile != -1)
2248                 error("fd leakage in start: %d", freq->localfile);
2249         freq->localfile = open(freq->tmpfile,
2250                                O_WRONLY | O_CREAT | O_EXCL, 0666);
2251         /*
2252          * This could have failed due to the "lazy directory creation";
2253          * try to mkdir the last path component.
2254          */
2255         if (freq->localfile < 0 && errno == ENOENT) {
2256                 char *dir = strrchr(freq->tmpfile, '/');
2257                 if (dir) {
2258                         *dir = 0;
2259                         mkdir(freq->tmpfile, 0777);
2260                         *dir = '/';
2261                 }
2262                 freq->localfile = open(freq->tmpfile,
2263                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
2264         }
2265
2266         if (freq->localfile < 0) {
2267                 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2268                 goto abort;
2269         }
2270
2271         git_inflate_init(&freq->stream);
2272
2273         git_SHA1_Init(&freq->c);
2274
2275         freq->url = get_remote_object_url(base_url, hex, 0);
2276
2277         /*
2278          * If a previous temp file is present, process what was already
2279          * fetched.
2280          */
2281         prevlocal = open(prevfile, O_RDONLY);
2282         if (prevlocal != -1) {
2283                 do {
2284                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2285                         if (prev_read>0) {
2286                                 if (fwrite_sha1_file(prev_buf,
2287                                                      1,
2288                                                      prev_read,
2289                                                      freq) == prev_read) {
2290                                         prev_posn += prev_read;
2291                                 } else {
2292                                         prev_read = -1;
2293                                 }
2294                         }
2295                 } while (prev_read > 0);
2296                 close(prevlocal);
2297         }
2298         unlink_or_warn(prevfile);
2299
2300         /*
2301          * Reset inflate/SHA1 if there was an error reading the previous temp
2302          * file; also rewind to the beginning of the local file.
2303          */
2304         if (prev_read == -1) {
2305                 memset(&freq->stream, 0, sizeof(freq->stream));
2306                 git_inflate_init(&freq->stream);
2307                 git_SHA1_Init(&freq->c);
2308                 if (prev_posn>0) {
2309                         prev_posn = 0;
2310                         lseek(freq->localfile, 0, SEEK_SET);
2311                         if (ftruncate(freq->localfile, 0) < 0) {
2312                                 error_errno("Couldn't truncate temporary file %s",
2313                                             freq->tmpfile);
2314                                 goto abort;
2315                         }
2316                 }
2317         }
2318
2319         freq->slot = get_active_slot();
2320
2321         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2322         curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2323         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2324         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2325         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2326         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2327
2328         /*
2329          * If we have successfully processed data from a previous fetch
2330          * attempt, only fetch the data we don't already have.
2331          */
2332         if (prev_posn>0) {
2333                 if (http_is_verbose)
2334                         fprintf(stderr,
2335                                 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2336                                 hex, (uintmax_t)prev_posn);
2337                 http_opt_request_remainder(freq->slot->curl, prev_posn);
2338         }
2339
2340         return freq;
2341
2342 abort:
2343         free(freq->url);
2344         free(freq);
2345         return NULL;
2346 }
2347
2348 void process_http_object_request(struct http_object_request *freq)
2349 {
2350         if (freq->slot == NULL)
2351                 return;
2352         freq->curl_result = freq->slot->curl_result;
2353         freq->http_code = freq->slot->http_code;
2354         freq->slot = NULL;
2355 }
2356
2357 int finish_http_object_request(struct http_object_request *freq)
2358 {
2359         struct stat st;
2360
2361         close(freq->localfile);
2362         freq->localfile = -1;
2363
2364         process_http_object_request(freq);
2365
2366         if (freq->http_code == 416) {
2367                 warning("requested range invalid; we may already have all the data.");
2368         } else if (freq->curl_result != CURLE_OK) {
2369                 if (stat(freq->tmpfile, &st) == 0)
2370                         if (st.st_size == 0)
2371                                 unlink_or_warn(freq->tmpfile);
2372                 return -1;
2373         }
2374
2375         git_inflate_end(&freq->stream);
2376         git_SHA1_Final(freq->real_sha1, &freq->c);
2377         if (freq->zret != Z_STREAM_END) {
2378                 unlink_or_warn(freq->tmpfile);
2379                 return -1;
2380         }
2381         if (hashcmp(freq->sha1, freq->real_sha1)) {
2382                 unlink_or_warn(freq->tmpfile);
2383                 return -1;
2384         }
2385         freq->rename =
2386                 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2387
2388         return freq->rename;
2389 }
2390
2391 void abort_http_object_request(struct http_object_request *freq)
2392 {
2393         unlink_or_warn(freq->tmpfile);
2394
2395         release_http_object_request(freq);
2396 }
2397
2398 void release_http_object_request(struct http_object_request *freq)
2399 {
2400         if (freq->localfile != -1) {
2401                 close(freq->localfile);
2402                 freq->localfile = -1;
2403         }
2404         if (freq->url != NULL) {
2405                 FREE_AND_NULL(freq->url);
2406         }
2407         if (freq->slot != NULL) {
2408                 freq->slot->callback_func = NULL;
2409                 freq->slot->callback_data = NULL;
2410                 release_active_slot(freq->slot);
2411                 freq->slot = NULL;
2412         }
2413 }