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

   1 #include "git-compat-util.h"
   2 #include "http.h"
   3 #include "pack.h"
   4 #include "sideband.h"
   5 #include "run-command.h"
   6 #include "url.h"
   7 #include "urlmatch.h"
   8 #include "credential.h"
   9 #include "version.h"
  10 #include "pkt-line.h"
  11 #include "gettext.h"
  12 #include "transport.h"
  13
  14 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
  15 #if LIBCURL_VERSION_NUM >= 0x070a08
  16 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
  17 #else
  18 long int git_curl_ipresolve;
  19 #endif
  20 int active_requests;
  21 int http_is_verbose;
  22 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  23
  24 #if LIBCURL_VERSION_NUM >= 0x070a06
  25 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  26 #endif
  27
  28 static int min_curl_sessions = 1;
  29 static int curl_session_count;
  30 #ifdef USE_CURL_MULTI
  31 static int max_requests = -1;
  32 static CURLM *curlm;
  33 #endif
  34 #ifndef NO_CURL_EASY_DUPHANDLE
  35 static CURL *curl_default;
  36 #endif
  37
  38 #define PREV_BUF_SIZE 4096
  39
  40 char curl_errorstr[CURL_ERROR_SIZE];
  41
  42 static int curl_ssl_verify = -1;
  43 static int curl_ssl_try;
  44 static const char *ssl_cert;
  45 static const char *ssl_cipherlist;
  46 static const char *ssl_version;
  47 static struct {
  48         const char *name;
  49         long ssl_version;
  50 } sslversions[] = {
  51         { "sslv2", CURL_SSLVERSION_SSLv2 },
  52         { "sslv3", CURL_SSLVERSION_SSLv3 },
  53         { "tlsv1", CURL_SSLVERSION_TLSv1 },
  54 #if LIBCURL_VERSION_NUM >= 0x072200
  55         { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
  56         { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
  57         { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
  58 #endif
  59 };
  60 #if LIBCURL_VERSION_NUM >= 0x070903
  61 static const char *ssl_key;
  62 #endif
  63 #if LIBCURL_VERSION_NUM >= 0x070908
  64 static const char *ssl_capath;
  65 #endif
  66 #if LIBCURL_VERSION_NUM >= 0x072c00
  67 static const char *ssl_pinnedkey;
  68 #endif
  69 static const char *ssl_cainfo;
  70 static long curl_low_speed_limit = -1;
  71 static long curl_low_speed_time = -1;
  72 static int curl_ftp_no_epsv;
  73 static const char *curl_http_proxy;
  74 static const char *curl_no_proxy;
  75 static const char *http_proxy_authmethod;
  76 static struct {
  77         const char *name;
  78         long curlauth_param;
  79 } proxy_authmethods[] = {
  80         { "basic", CURLAUTH_BASIC },
  81         { "digest", CURLAUTH_DIGEST },
  82         { "negotiate", CURLAUTH_GSSNEGOTIATE },
  83         { "ntlm", CURLAUTH_NTLM },
  84 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  85         { "anyauth", CURLAUTH_ANY },
  86 #endif
  87         /*
  88          * CURLAUTH_DIGEST_IE has no corresponding command-line option in
  89          * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
  90          * here, too
  91          */
  92 };
  93 #if LIBCURL_VERSION_NUM >= 0x071600
  94 static const char *curl_deleg;
  95 static struct {
  96         const char *name;
  97         long curl_deleg_param;
  98 } curl_deleg_levels[] = {
  99         { "none", CURLGSSAPI_DELEGATION_NONE },
 100         { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
 101         { "always", CURLGSSAPI_DELEGATION_FLAG },
 102 };
 103 #endif
 104
 105 static struct credential proxy_auth = CREDENTIAL_INIT;
 106 static const char *curl_proxyuserpwd;
 107 static const char *curl_cookie_file;
 108 static int curl_save_cookies;
 109 struct credential http_auth = CREDENTIAL_INIT;
 110 static int http_proactive_auth;
 111 static const char *user_agent;
 112 static int curl_empty_auth = -1;
 113
 114 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
 115
 116 #if LIBCURL_VERSION_NUM >= 0x071700
 117 /* Use CURLOPT_KEYPASSWD as is */
 118 #elif LIBCURL_VERSION_NUM >= 0x070903
 119 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
 120 #else
 121 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
 122 #endif
 123
 124 static struct credential cert_auth = CREDENTIAL_INIT;
 125 static int ssl_cert_password_required;
 126 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 127 static unsigned long http_auth_methods = CURLAUTH_ANY;
 128 static int http_auth_methods_restricted;
 129 /* Modes for which empty_auth cannot actually help us. */
 130 static unsigned long empty_auth_useless =
 131         CURLAUTH_BASIC
 132 #ifdef CURLAUTH_DIGEST_IE
 133         | CURLAUTH_DIGEST_IE
 134 #endif
 135         | CURLAUTH_DIGEST;
 136 #endif
 137
 138 static struct curl_slist *pragma_header;
 139 static struct curl_slist *no_pragma_header;
 140 static struct curl_slist *extra_http_headers;
 141
 142 static struct active_request_slot *active_queue_head;
 143
 144 static char *cached_accept_language;
 145
 146 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 147 {
 148         size_t size = eltsize * nmemb;
 149         struct buffer *buffer = buffer_;
 150
 151         if (size > buffer->buf.len - buffer->posn)
 152                 size = buffer->buf.len - buffer->posn;
 153         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
 154         buffer->posn += size;
 155
 156         return size;
 157 }
 158
 159 #ifndef NO_CURL_IOCTL
 160 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
 161 {
 162         struct buffer *buffer = clientp;
 163
 164         switch (cmd) {
 165         case CURLIOCMD_NOP:
 166                 return CURLIOE_OK;
 167
 168         case CURLIOCMD_RESTARTREAD:
 169                 buffer->posn = 0;
 170                 return CURLIOE_OK;
 171
 172         default:
 173                 return CURLIOE_UNKNOWNCMD;
 174         }
 175 }
 176 #endif
 177
 178 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 179 {
 180         size_t size = eltsize * nmemb;
 181         struct strbuf *buffer = buffer_;
 182
 183         strbuf_add(buffer, ptr, size);
 184         return size;
 185 }
 186
 187 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 188 {
 189         return eltsize * nmemb;
 190 }
 191
 192 static void closedown_active_slot(struct active_request_slot *slot)
 193 {
 194         active_requests--;
 195         slot->in_use = 0;
 196 }
 197
 198 static void finish_active_slot(struct active_request_slot *slot)
 199 {
 200         closedown_active_slot(slot);
 201         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 202
 203         if (slot->finished != NULL)
 204                 (*slot->finished) = 1;
 205
 206         /* Store slot results so they can be read after the slot is reused */
 207         if (slot->results != NULL) {
 208                 slot->results->curl_result = slot->curl_result;
 209                 slot->results->http_code = slot->http_code;
 210 #if LIBCURL_VERSION_NUM >= 0x070a08
 211                 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 212                                   &slot->results->auth_avail);
 213 #else
 214                 slot->results->auth_avail = 0;
 215 #endif
 216
 217                 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
 218                         &slot->results->http_connectcode);
 219         }
 220
 221         /* Run callback if appropriate */
 222         if (slot->callback_func != NULL)
 223                 slot->callback_func(slot->callback_data);
 224 }
 225
 226 static void xmulti_remove_handle(struct active_request_slot *slot)
 227 {
 228 #ifdef USE_CURL_MULTI
 229         curl_multi_remove_handle(curlm, slot->curl);
 230 #endif
 231 }
 232
 233 #ifdef USE_CURL_MULTI
 234 static void process_curl_messages(void)
 235 {
 236         int num_messages;
 237         struct active_request_slot *slot;
 238         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 239
 240         while (curl_message != NULL) {
 241                 if (curl_message->msg == CURLMSG_DONE) {
 242                         int curl_result = curl_message->data.result;
 243                         slot = active_queue_head;
 244                         while (slot != NULL &&
 245                                slot->curl != curl_message->easy_handle)
 246                                 slot = slot->next;
 247                         if (slot != NULL) {
 248                                 xmulti_remove_handle(slot);
 249                                 slot->curl_result = curl_result;
 250                                 finish_active_slot(slot);
 251                         } else {
 252                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 253                         }
 254                 } else {
 255                         fprintf(stderr, "Unknown CURL message received: %d\n",
 256                                 (int)curl_message->msg);
 257                 }
 258                 curl_message = curl_multi_info_read(curlm, &num_messages);
 259         }
 260 }
 261 #endif
 262
 263 static int http_options(const char *var, const char *value, void *cb)
 264 {
 265         if (!strcmp("http.sslverify", var)) {
 266                 curl_ssl_verify = git_config_bool(var, value);
 267                 return 0;
 268         }
 269         if (!strcmp("http.sslcipherlist", var))
 270                 return git_config_string(&ssl_cipherlist, var, value);
 271         if (!strcmp("http.sslversion", var))
 272                 return git_config_string(&ssl_version, var, value);
 273         if (!strcmp("http.sslcert", var))
 274                 return git_config_string(&ssl_cert, var, value);
 275 #if LIBCURL_VERSION_NUM >= 0x070903
 276         if (!strcmp("http.sslkey", var))
 277                 return git_config_string(&ssl_key, var, value);
 278 #endif
 279 #if LIBCURL_VERSION_NUM >= 0x070908
 280         if (!strcmp("http.sslcapath", var))
 281                 return git_config_pathname(&ssl_capath, var, value);
 282 #endif
 283         if (!strcmp("http.sslcainfo", var))
 284                 return git_config_pathname(&ssl_cainfo, var, value);
 285         if (!strcmp("http.sslcertpasswordprotected", var)) {
 286                 ssl_cert_password_required = git_config_bool(var, value);
 287                 return 0;
 288         }
 289         if (!strcmp("http.ssltry", var)) {
 290                 curl_ssl_try = git_config_bool(var, value);
 291                 return 0;
 292         }
 293         if (!strcmp("http.minsessions", var)) {
 294                 min_curl_sessions = git_config_int(var, value);
 295 #ifndef USE_CURL_MULTI
 296                 if (min_curl_sessions > 1)
 297                         min_curl_sessions = 1;
 298 #endif
 299                 return 0;
 300         }
 301 #ifdef USE_CURL_MULTI
 302         if (!strcmp("http.maxrequests", var)) {
 303                 max_requests = git_config_int(var, value);
 304                 return 0;
 305         }
 306 #endif
 307         if (!strcmp("http.lowspeedlimit", var)) {
 308                 curl_low_speed_limit = (long)git_config_int(var, value);
 309                 return 0;
 310         }
 311         if (!strcmp("http.lowspeedtime", var)) {
 312                 curl_low_speed_time = (long)git_config_int(var, value);
 313                 return 0;
 314         }
 315
 316         if (!strcmp("http.noepsv", var)) {
 317                 curl_ftp_no_epsv = git_config_bool(var, value);
 318                 return 0;
 319         }
 320         if (!strcmp("http.proxy", var))
 321                 return git_config_string(&curl_http_proxy, var, value);
 322
 323         if (!strcmp("http.proxyauthmethod", var))
 324                 return git_config_string(&http_proxy_authmethod, var, value);
 325
 326         if (!strcmp("http.cookiefile", var))
 327                 return git_config_pathname(&curl_cookie_file, var, value);
 328         if (!strcmp("http.savecookies", var)) {
 329                 curl_save_cookies = git_config_bool(var, value);
 330                 return 0;
 331         }
 332
 333         if (!strcmp("http.postbuffer", var)) {
 334                 http_post_buffer = git_config_int(var, value);
 335                 if (http_post_buffer < LARGE_PACKET_MAX)
 336                         http_post_buffer = LARGE_PACKET_MAX;
 337                 return 0;
 338         }
 339
 340         if (!strcmp("http.useragent", var))
 341                 return git_config_string(&user_agent, var, value);
 342
 343         if (!strcmp("http.emptyauth", var)) {
 344                 if (value && !strcmp("auto", value))
 345                         curl_empty_auth = -1;
 346                 else
 347                         curl_empty_auth = git_config_bool(var, value);
 348                 return 0;
 349         }
 350
 351         if (!strcmp("http.delegation", var)) {
 352 #if LIBCURL_VERSION_NUM >= 0x071600
 353                 return git_config_string(&curl_deleg, var, value);
 354 #else
 355                 warning(_("Delegation control is not supported with cURL < 7.22.0"));
 356                 return 0;
 357 #endif
 358         }
 359
 360         if (!strcmp("http.pinnedpubkey", var)) {
 361 #if LIBCURL_VERSION_NUM >= 0x072c00
 362                 return git_config_pathname(&ssl_pinnedkey, var, value);
 363 #else
 364                 warning(_("Public key pinning not supported with cURL < 7.44.0"));
 365                 return 0;
 366 #endif
 367         }
 368
 369         if (!strcmp("http.extraheader", var)) {
 370                 if (!value) {
 371                         return config_error_nonbool(var);
 372                 } else if (!*value) {
 373                         curl_slist_free_all(extra_http_headers);
 374                         extra_http_headers = NULL;
 375                 } else {
 376                         extra_http_headers =
 377                                 curl_slist_append(extra_http_headers, value);
 378                 }
 379                 return 0;
 380         }
 381
 382         if (!strcmp("http.followredirects", var)) {
 383                 if (value && !strcmp(value, "initial"))
 384                         http_follow_config = HTTP_FOLLOW_INITIAL;
 385                 else if (git_config_bool(var, value))
 386                         http_follow_config = HTTP_FOLLOW_ALWAYS;
 387                 else
 388                         http_follow_config = HTTP_FOLLOW_NONE;
 389                 return 0;
 390         }
 391
 392         /* Fall back on the default ones */
 393         return git_default_config(var, value, cb);
 394 }
 395
 396 static int curl_empty_auth_enabled(void)
 397 {
 398         if (curl_empty_auth >= 0)
 399                 return curl_empty_auth;
 400
 401 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
 402         /*
 403          * Our libcurl is too old to do AUTH_ANY in the first place;
 404          * just default to turning the feature off.
 405          */
 406 #else
 407         /*
 408          * In the automatic case, kick in the empty-auth
 409          * hack as long as we would potentially try some
 410          * method more exotic than "Basic" or "Digest".
 411          *
 412          * But only do this when this is our second or
 413          * subsequent request, as by then we know what
 414          * methods are available.
 415          */
 416         if (http_auth_methods_restricted &&
 417             (http_auth_methods & ~empty_auth_useless))
 418                 return 1;
 419 #endif
 420         return 0;
 421 }
 422
 423 static void init_curl_http_auth(CURL *result)
 424 {
 425         if (!http_auth.username || !*http_auth.username) {
 426                 if (curl_empty_auth_enabled())
 427                         curl_easy_setopt(result, CURLOPT_USERPWD, ":");
 428                 return;
 429         }
 430
 431         credential_fill(&http_auth);
 432
 433 #if LIBCURL_VERSION_NUM >= 0x071301
 434         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 435         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 436 #else
 437         {
 438                 static struct strbuf up = STRBUF_INIT;
 439                 /*
 440                  * Note that we assume we only ever have a single set of
 441                  * credentials in a given program run, so we do not have
 442                  * to worry about updating this buffer, only setting its
 443                  * initial value.
 444                  */
 445                 if (!up.len)
 446                         strbuf_addf(&up, "%s:%s",
 447                                 http_auth.username, http_auth.password);
 448                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 449         }
 450 #endif
 451 }
 452
 453 /* *var must be free-able */
 454 static void var_override(const char **var, char *value)
 455 {
 456         if (value) {
 457                 free((void *)*var);
 458                 *var = xstrdup(value);
 459         }
 460 }
 461
 462 static void set_proxyauth_name_password(CURL *result)
 463 {
 464 #if LIBCURL_VERSION_NUM >= 0x071301
 465                 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
 466                         proxy_auth.username);
 467                 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
 468                         proxy_auth.password);
 469 #else
 470                 struct strbuf s = STRBUF_INIT;
 471
 472                 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
 473                 strbuf_addch(&s, ':');
 474                 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
 475                 curl_proxyuserpwd = strbuf_detach(&s, NULL);
 476                 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
 477 #endif
 478 }
 479
 480 static void init_curl_proxy_auth(CURL *result)
 481 {
 482         if (proxy_auth.username) {
 483                 if (!proxy_auth.password)
 484                         credential_fill(&proxy_auth);
 485                 set_proxyauth_name_password(result);
 486         }
 487
 488         var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
 489
 490 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
 491         if (http_proxy_authmethod) {
 492                 int i;
 493                 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
 494                         if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
 495                                 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
 496                                                 proxy_authmethods[i].curlauth_param);
 497                                 break;
 498                         }
 499                 }
 500                 if (i == ARRAY_SIZE(proxy_authmethods)) {
 501                         warning("unsupported proxy authentication method %s: using anyauth",
 502                                         http_proxy_authmethod);
 503                         curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 504                 }
 505         }
 506         else
 507                 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 508 #endif
 509 }
 510
 511 static int has_cert_password(void)
 512 {
 513         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 514                 return 0;
 515         if (!cert_auth.password) {
 516                 cert_auth.protocol = xstrdup("cert");
 517                 cert_auth.username = xstrdup("");
 518                 cert_auth.path = xstrdup(ssl_cert);
 519                 credential_fill(&cert_auth);
 520         }
 521         return 1;
 522 }
 523
 524 #if LIBCURL_VERSION_NUM >= 0x071900
 525 static void set_curl_keepalive(CURL *c)
 526 {
 527         curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 528 }
 529
 530 #elif LIBCURL_VERSION_NUM >= 0x071000
 531 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 532 {
 533         int ka = 1;
 534         int rc;
 535         socklen_t len = (socklen_t)sizeof(ka);
 536
 537         if (type != CURLSOCKTYPE_IPCXN)
 538                 return 0;
 539
 540         rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 541         if (rc < 0)
 542                 warning_errno("unable to set SO_KEEPALIVE on socket");
 543
 544         return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 545 }
 546
 547 static void set_curl_keepalive(CURL *c)
 548 {
 549         curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 550 }
 551
 552 #else
 553 static void set_curl_keepalive(CURL *c)
 554 {
 555         /* not supported on older curl versions */
 556 }
 557 #endif
 558
 559 static void redact_sensitive_header(struct strbuf *header)
 560 {
 561         const char *sensitive_header;
 562
 563         if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
 564             skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
 565                 /* The first token is the type, which is OK to log */
 566                 while (isspace(*sensitive_header))
 567                         sensitive_header++;
 568                 while (*sensitive_header && !isspace(*sensitive_header))
 569                         sensitive_header++;
 570                 /* Everything else is opaque and possibly sensitive */
 571                 strbuf_setlen(header,  sensitive_header - header->buf);
 572                 strbuf_addstr(header, " <redacted>");
 573         }
 574 }
 575
 576 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
 577 {
 578         struct strbuf out = STRBUF_INIT;
 579         struct strbuf **headers, **header;
 580
 581         strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 582                 text, (long)size, (long)size);
 583         trace_strbuf(&trace_curl, &out);
 584         strbuf_reset(&out);
 585         strbuf_add(&out, ptr, size);
 586         headers = strbuf_split_max(&out, '\n', 0);
 587
 588         for (header = headers; *header; header++) {
 589                 if (hide_sensitive_header)
 590                         redact_sensitive_header(*header);
 591                 strbuf_insert((*header), 0, text, strlen(text));
 592                 strbuf_insert((*header), strlen(text), ": ", 2);
 593                 strbuf_rtrim((*header));
 594                 strbuf_addch((*header), '\n');
 595                 trace_strbuf(&trace_curl, (*header));
 596         }
 597         strbuf_list_free(headers);
 598         strbuf_release(&out);
 599 }
 600
 601 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
 602 {
 603         size_t i;
 604         struct strbuf out = STRBUF_INIT;
 605         unsigned int width = 60;
 606
 607         strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
 608                 text, (long)size, (long)size);
 609         trace_strbuf(&trace_curl, &out);
 610
 611         for (i = 0; i < size; i += width) {
 612                 size_t w;
 613
 614                 strbuf_reset(&out);
 615                 strbuf_addf(&out, "%s: ", text);
 616                 for (w = 0; (w < width) && (i + w < size); w++) {
 617                         unsigned char ch = ptr[i + w];
 618
 619                         strbuf_addch(&out,
 620                                        (ch >= 0x20) && (ch < 0x80)
 621                                        ? ch : '.');
 622                 }
 623                 strbuf_addch(&out, '\n');
 624                 trace_strbuf(&trace_curl, &out);
 625         }
 626         strbuf_release(&out);
 627 }
 628
 629 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
 630 {
 631         const char *text;
 632         enum { NO_FILTER = 0, DO_FILTER = 1 };
 633
 634         switch (type) {
 635         case CURLINFO_TEXT:
 636                 trace_printf_key(&trace_curl, "== Info: %s", data);
 637         default:                /* we ignore unknown types by default */
 638                 return 0;
 639
 640         case CURLINFO_HEADER_OUT:
 641                 text = "=> Send header";
 642                 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
 643                 break;
 644         case CURLINFO_DATA_OUT:
 645                 text = "=> Send data";
 646                 curl_dump_data(text, (unsigned char *)data, size);
 647                 break;
 648         case CURLINFO_SSL_DATA_OUT:
 649                 text = "=> Send SSL data";
 650                 curl_dump_data(text, (unsigned char *)data, size);
 651                 break;
 652         case CURLINFO_HEADER_IN:
 653                 text = "<= Recv header";
 654                 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
 655                 break;
 656         case CURLINFO_DATA_IN:
 657                 text = "<= Recv data";
 658                 curl_dump_data(text, (unsigned char *)data, size);
 659                 break;
 660         case CURLINFO_SSL_DATA_IN:
 661                 text = "<= Recv SSL data";
 662                 curl_dump_data(text, (unsigned char *)data, size);
 663                 break;
 664         }
 665         return 0;
 666 }
 667
 668 void setup_curl_trace(CURL *handle)
 669 {
 670         if (!trace_want(&trace_curl))
 671                 return;
 672         curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
 673         curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
 674         curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
 675 }
 676
 677 static long get_curl_allowed_protocols(int from_user)
 678 {
 679         long allowed_protocols = 0;
 680
 681         if (is_transport_allowed("http", from_user))
 682                 allowed_protocols |= CURLPROTO_HTTP;
 683         if (is_transport_allowed("https", from_user))
 684                 allowed_protocols |= CURLPROTO_HTTPS;
 685         if (is_transport_allowed("ftp", from_user))
 686                 allowed_protocols |= CURLPROTO_FTP;
 687         if (is_transport_allowed("ftps", from_user))
 688                 allowed_protocols |= CURLPROTO_FTPS;
 689
 690         return allowed_protocols;
 691 }
 692
 693 static CURL *get_curl_handle(void)
 694 {
 695         CURL *result = curl_easy_init();
 696
 697         if (!result)
 698                 die("curl_easy_init failed");
 699
 700         if (!curl_ssl_verify) {
 701                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 702                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 703         } else {
 704                 /* Verify authenticity of the peer's certificate */
 705                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 706                 /* The name in the cert must match whom we tried to connect */
 707                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 708         }
 709
 710 #if LIBCURL_VERSION_NUM >= 0x070907
 711         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 712 #endif
 713 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 714         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 715 #endif
 716
 717 #if LIBCURL_VERSION_NUM >= 0x071600
 718         if (curl_deleg) {
 719                 int i;
 720                 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
 721                         if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
 722                                 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
 723                                                 curl_deleg_levels[i].curl_deleg_param);
 724                                 break;
 725                         }
 726                 }
 727                 if (i == ARRAY_SIZE(curl_deleg_levels))
 728                         warning("Unknown delegation method '%s': using default",
 729                                 curl_deleg);
 730         }
 731 #endif
 732
 733         if (http_proactive_auth)
 734                 init_curl_http_auth(result);
 735
 736         if (getenv("GIT_SSL_VERSION"))
 737                 ssl_version = getenv("GIT_SSL_VERSION");
 738         if (ssl_version && *ssl_version) {
 739                 int i;
 740                 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
 741                         if (!strcmp(ssl_version, sslversions[i].name)) {
 742                                 curl_easy_setopt(result, CURLOPT_SSLVERSION,
 743                                                  sslversions[i].ssl_version);
 744                                 break;
 745                         }
 746                 }
 747                 if (i == ARRAY_SIZE(sslversions))
 748                         warning("unsupported ssl version %s: using default",
 749                                 ssl_version);
 750         }
 751
 752         if (getenv("GIT_SSL_CIPHER_LIST"))
 753                 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 754         if (ssl_cipherlist != NULL && *ssl_cipherlist)
 755                 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 756                                 ssl_cipherlist);
 757
 758         if (ssl_cert != NULL)
 759                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 760         if (has_cert_password())
 761                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 762 #if LIBCURL_VERSION_NUM >= 0x070903
 763         if (ssl_key != NULL)
 764                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 765 #endif
 766 #if LIBCURL_VERSION_NUM >= 0x070908
 767         if (ssl_capath != NULL)
 768                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 769 #endif
 770 #if LIBCURL_VERSION_NUM >= 0x072c00
 771         if (ssl_pinnedkey != NULL)
 772                 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
 773 #endif
 774         if (ssl_cainfo != NULL)
 775                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 776
 777         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 778                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 779                                  curl_low_speed_limit);
 780                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 781                                  curl_low_speed_time);
 782         }
 783
 784         curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 785 #if LIBCURL_VERSION_NUM >= 0x071301
 786         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 787 #elif LIBCURL_VERSION_NUM >= 0x071101
 788         curl_easy_setopt(result, CURLOPT_POST301, 1);
 789 #endif
 790 #if LIBCURL_VERSION_NUM >= 0x071304
 791         curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
 792                          get_curl_allowed_protocols(0));
 793         curl_easy_setopt(result, CURLOPT_PROTOCOLS,
 794                          get_curl_allowed_protocols(-1));
 795 #else
 796         warning("protocol restrictions not applied to curl redirects because\n"
 797                 "your curl version is too old (>= 7.19.4)");
 798 #endif
 799         if (getenv("GIT_CURL_VERBOSE"))
 800                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
 801         setup_curl_trace(result);
 802
 803         curl_easy_setopt(result, CURLOPT_USERAGENT,
 804                 user_agent ? user_agent : git_user_agent());
 805
 806         if (curl_ftp_no_epsv)
 807                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 808
 809 #ifdef CURLOPT_USE_SSL
 810         if (curl_ssl_try)
 811                 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 812 #endif
 813
 814         /*
 815          * CURL also examines these variables as a fallback; but we need to query
 816          * them here in order to decide whether to prompt for missing password (cf.
 817          * init_curl_proxy_auth()).
 818          *
 819          * Unlike many other common environment variables, these are historically
 820          * lowercase only. It appears that CURL did not know this and implemented
 821          * only uppercase variants, which was later corrected to take both - with
 822          * the exception of http_proxy, which is lowercase only also in CURL. As
 823          * the lowercase versions are the historical quasi-standard, they take
 824          * precedence here, as in CURL.
 825          */
 826         if (!curl_http_proxy) {
 827                 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
 828                         var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
 829                         var_override(&curl_http_proxy, getenv("https_proxy"));
 830                 } else {
 831                         var_override(&curl_http_proxy, getenv("http_proxy"));
 832                 }
 833                 if (!curl_http_proxy) {
 834                         var_override(&curl_http_proxy, getenv("ALL_PROXY"));
 835                         var_override(&curl_http_proxy, getenv("all_proxy"));
 836                 }
 837         }
 838
 839         if (curl_http_proxy) {
 840                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 841 #if LIBCURL_VERSION_NUM >= 0x071800
 842                 if (starts_with(curl_http_proxy, "socks5h"))
 843                         curl_easy_setopt(result,
 844                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
 845                 else if (starts_with(curl_http_proxy, "socks5"))
 846                         curl_easy_setopt(result,
 847                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 848                 else if (starts_with(curl_http_proxy, "socks4a"))
 849                         curl_easy_setopt(result,
 850                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 851                 else if (starts_with(curl_http_proxy, "socks"))
 852                         curl_easy_setopt(result,
 853                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 854 #endif
 855                 if (strstr(curl_http_proxy, "://"))
 856                         credential_from_url(&proxy_auth, curl_http_proxy);
 857                 else {
 858                         struct strbuf url = STRBUF_INIT;
 859                         strbuf_addf(&url, "http://%s", curl_http_proxy);
 860                         credential_from_url(&proxy_auth, url.buf);
 861                         strbuf_release(&url);
 862                 }
 863
 864                 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 865 #if LIBCURL_VERSION_NUM >= 0x071304
 866                 var_override(&curl_no_proxy, getenv("NO_PROXY"));
 867                 var_override(&curl_no_proxy, getenv("no_proxy"));
 868                 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 869 #endif
 870         }
 871         init_curl_proxy_auth(result);
 872
 873         set_curl_keepalive(result);
 874
 875         return result;
 876 }
 877
 878 static void set_from_env(const char **var, const char *envname)
 879 {
 880         const char *val = getenv(envname);
 881         if (val)
 882                 *var = val;
 883 }
 884
 885 void http_init(struct remote *remote, const char *url, int proactive_auth)
 886 {
 887         char *low_speed_limit;
 888         char *low_speed_time;
 889         char *normalized_url;
 890         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 891
 892         config.section = "http";
 893         config.key = NULL;
 894         config.collect_fn = http_options;
 895         config.cascade_fn = git_default_config;
 896         config.cb = NULL;
 897
 898         http_is_verbose = 0;
 899         normalized_url = url_normalize(url, &config.url);
 900
 901         git_config(urlmatch_config_entry, &config);
 902         free(normalized_url);
 903
 904         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 905                 die("curl_global_init failed");
 906
 907         http_proactive_auth = proactive_auth;
 908
 909         if (remote && remote->http_proxy)
 910                 curl_http_proxy = xstrdup(remote->http_proxy);
 911
 912         if (remote)
 913                 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 914
 915         pragma_header = curl_slist_append(http_copy_default_headers(),
 916                 "Pragma: no-cache");
 917         no_pragma_header = curl_slist_append(http_copy_default_headers(),
 918                 "Pragma:");
 919
 920 #ifdef USE_CURL_MULTI
 921         {
 922                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 923                 if (http_max_requests != NULL)
 924                         max_requests = atoi(http_max_requests);
 925         }
 926
 927         curlm = curl_multi_init();
 928         if (!curlm)
 929                 die("curl_multi_init failed");
 930 #endif
 931
 932         if (getenv("GIT_SSL_NO_VERIFY"))
 933                 curl_ssl_verify = 0;
 934
 935         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 936 #if LIBCURL_VERSION_NUM >= 0x070903
 937         set_from_env(&ssl_key, "GIT_SSL_KEY");
 938 #endif
 939 #if LIBCURL_VERSION_NUM >= 0x070908
 940         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 941 #endif
 942         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 943
 944         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 945
 946         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 947         if (low_speed_limit != NULL)
 948                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 949         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 950         if (low_speed_time != NULL)
 951                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 952
 953         if (curl_ssl_verify == -1)
 954                 curl_ssl_verify = 1;
 955
 956         curl_session_count = 0;
 957 #ifdef USE_CURL_MULTI
 958         if (max_requests < 1)
 959                 max_requests = DEFAULT_MAX_REQUESTS;
 960 #endif
 961
 962         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 963                 curl_ftp_no_epsv = 1;
 964
 965         if (url) {
 966                 credential_from_url(&http_auth, url);
 967                 if (!ssl_cert_password_required &&
 968                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 969                     starts_with(url, "https://"))
 970                         ssl_cert_password_required = 1;
 971         }
 972
 973 #ifndef NO_CURL_EASY_DUPHANDLE
 974         curl_default = get_curl_handle();
 975 #endif
 976 }
 977
 978 void http_cleanup(void)
 979 {
 980         struct active_request_slot *slot = active_queue_head;
 981
 982         while (slot != NULL) {
 983                 struct active_request_slot *next = slot->next;
 984                 if (slot->curl != NULL) {
 985                         xmulti_remove_handle(slot);
 986                         curl_easy_cleanup(slot->curl);
 987                 }
 988                 free(slot);
 989                 slot = next;
 990         }
 991         active_queue_head = NULL;
 992
 993 #ifndef NO_CURL_EASY_DUPHANDLE
 994         curl_easy_cleanup(curl_default);
 995 #endif
 996
 997 #ifdef USE_CURL_MULTI
 998         curl_multi_cleanup(curlm);
 999 #endif
1000         curl_global_cleanup();
1001
1002         curl_slist_free_all(extra_http_headers);
1003         extra_http_headers = NULL;
1004
1005         curl_slist_free_all(pragma_header);
1006         pragma_header = NULL;
1007
1008         curl_slist_free_all(no_pragma_header);
1009         no_pragma_header = NULL;
1010
1011         if (curl_http_proxy) {
1012                 free((void *)curl_http_proxy);
1013                 curl_http_proxy = NULL;
1014         }
1015
1016         if (proxy_auth.password) {
1017                 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1018                 free(proxy_auth.password);
1019                 proxy_auth.password = NULL;
1020         }
1021
1022         free((void *)curl_proxyuserpwd);
1023         curl_proxyuserpwd = NULL;
1024
1025         free((void *)http_proxy_authmethod);
1026         http_proxy_authmethod = NULL;
1027
1028         if (cert_auth.password != NULL) {
1029                 memset(cert_auth.password, 0, strlen(cert_auth.password));
1030                 free(cert_auth.password);
1031                 cert_auth.password = NULL;
1032         }
1033         ssl_cert_password_required = 0;
1034
1035         free(cached_accept_language);
1036         cached_accept_language = NULL;
1037 }
1038
1039 struct active_request_slot *get_active_slot(void)
1040 {
1041         struct active_request_slot *slot = active_queue_head;
1042         struct active_request_slot *newslot;
1043
1044 #ifdef USE_CURL_MULTI
1045         int num_transfers;
1046
1047         /* Wait for a slot to open up if the queue is full */
1048         while (active_requests >= max_requests) {
1049                 curl_multi_perform(curlm, &num_transfers);
1050                 if (num_transfers < active_requests)
1051                         process_curl_messages();
1052         }
1053 #endif
1054
1055         while (slot != NULL && slot->in_use)
1056                 slot = slot->next;
1057
1058         if (slot == NULL) {
1059                 newslot = xmalloc(sizeof(*newslot));
1060                 newslot->curl = NULL;
1061                 newslot->in_use = 0;
1062                 newslot->next = NULL;
1063
1064                 slot = active_queue_head;
1065                 if (slot == NULL) {
1066                         active_queue_head = newslot;
1067                 } else {
1068                         while (slot->next != NULL)
1069                                 slot = slot->next;
1070                         slot->next = newslot;
1071                 }
1072                 slot = newslot;
1073         }
1074
1075         if (slot->curl == NULL) {
1076 #ifdef NO_CURL_EASY_DUPHANDLE
1077                 slot->curl = get_curl_handle();
1078 #else
1079                 slot->curl = curl_easy_duphandle(curl_default);
1080 #endif
1081                 curl_session_count++;
1082         }
1083
1084         active_requests++;
1085         slot->in_use = 1;
1086         slot->results = NULL;
1087         slot->finished = NULL;
1088         slot->callback_data = NULL;
1089         slot->callback_func = NULL;
1090         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1091         if (curl_save_cookies)
1092                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1093         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1094         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1095         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1096         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1097         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1098         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1099         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1100         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1101         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1102         curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1103
1104         /*
1105          * Default following to off unless "ALWAYS" is configured; this gives
1106          * callers a sane starting point, and they can tweak for individual
1107          * HTTP_FOLLOW_* cases themselves.
1108          */
1109         if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1110                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1111         else
1112                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1113
1114 #if LIBCURL_VERSION_NUM >= 0x070a08
1115         curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1116 #endif
1117 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1118         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1119 #endif
1120         if (http_auth.password || curl_empty_auth_enabled())
1121                 init_curl_http_auth(slot->curl);
1122
1123         return slot;
1124 }
1125
1126 int start_active_slot(struct active_request_slot *slot)
1127 {
1128 #ifdef USE_CURL_MULTI
1129         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1130         int num_transfers;
1131
1132         if (curlm_result != CURLM_OK &&
1133             curlm_result != CURLM_CALL_MULTI_PERFORM) {
1134                 warning("curl_multi_add_handle failed: %s",
1135                         curl_multi_strerror(curlm_result));
1136                 active_requests--;
1137                 slot->in_use = 0;
1138                 return 0;
1139         }
1140
1141         /*
1142          * We know there must be something to do, since we just added
1143          * something.
1144          */
1145         curl_multi_perform(curlm, &num_transfers);
1146 #endif
1147         return 1;
1148 }
1149
1150 #ifdef USE_CURL_MULTI
1151 struct fill_chain {
1152         void *data;
1153         int (*fill)(void *);
1154         struct fill_chain *next;
1155 };
1156
1157 static struct fill_chain *fill_cfg;
1158
1159 void add_fill_function(void *data, int (*fill)(void *))
1160 {
1161         struct fill_chain *new = xmalloc(sizeof(*new));
1162         struct fill_chain **linkp = &fill_cfg;
1163         new->data = data;
1164         new->fill = fill;
1165         new->next = NULL;
1166         while (*linkp)
1167                 linkp = &(*linkp)->next;
1168         *linkp = new;
1169 }
1170
1171 void fill_active_slots(void)
1172 {
1173         struct active_request_slot *slot = active_queue_head;
1174
1175         while (active_requests < max_requests) {
1176                 struct fill_chain *fill;
1177                 for (fill = fill_cfg; fill; fill = fill->next)
1178                         if (fill->fill(fill->data))
1179                                 break;
1180
1181                 if (!fill)
1182                         break;
1183         }
1184
1185         while (slot != NULL) {
1186                 if (!slot->in_use && slot->curl != NULL
1187                         && curl_session_count > min_curl_sessions) {
1188                         curl_easy_cleanup(slot->curl);
1189                         slot->curl = NULL;
1190                         curl_session_count--;
1191                 }
1192                 slot = slot->next;
1193         }
1194 }
1195
1196 void step_active_slots(void)
1197 {
1198         int num_transfers;
1199         CURLMcode curlm_result;
1200
1201         do {
1202                 curlm_result = curl_multi_perform(curlm, &num_transfers);
1203         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1204         if (num_transfers < active_requests) {
1205                 process_curl_messages();
1206                 fill_active_slots();
1207         }
1208 }
1209 #endif
1210
1211 void run_active_slot(struct active_request_slot *slot)
1212 {
1213 #ifdef USE_CURL_MULTI
1214         fd_set readfds;
1215         fd_set writefds;
1216         fd_set excfds;
1217         int max_fd;
1218         struct timeval select_timeout;
1219         int finished = 0;
1220
1221         slot->finished = &finished;
1222         while (!finished) {
1223                 step_active_slots();
1224
1225                 if (slot->in_use) {
1226 #if LIBCURL_VERSION_NUM >= 0x070f04
1227                         long curl_timeout;
1228                         curl_multi_timeout(curlm, &curl_timeout);
1229                         if (curl_timeout == 0) {
1230                                 continue;
1231                         } else if (curl_timeout == -1) {
1232                                 select_timeout.tv_sec  = 0;
1233                                 select_timeout.tv_usec = 50000;
1234                         } else {
1235                                 select_timeout.tv_sec  =  curl_timeout / 1000;
1236                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1237                         }
1238 #else
1239                         select_timeout.tv_sec  = 0;
1240                         select_timeout.tv_usec = 50000;
1241 #endif
1242
1243                         max_fd = -1;
1244                         FD_ZERO(&readfds);
1245                         FD_ZERO(&writefds);
1246                         FD_ZERO(&excfds);
1247                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1248
1249                         /*
1250                          * It can happen that curl_multi_timeout returns a pathologically
1251                          * long timeout when curl_multi_fdset returns no file descriptors
1252                          * to read.  See commit message for more details.
1253                          */
1254                         if (max_fd < 0 &&
1255                             (select_timeout.tv_sec > 0 ||
1256                              select_timeout.tv_usec > 50000)) {
1257                                 select_timeout.tv_sec  = 0;
1258                                 select_timeout.tv_usec = 50000;
1259                         }
1260
1261                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1262                 }
1263         }
1264 #else
1265         while (slot->in_use) {
1266                 slot->curl_result = curl_easy_perform(slot->curl);
1267                 finish_active_slot(slot);
1268         }
1269 #endif
1270 }
1271
1272 static void release_active_slot(struct active_request_slot *slot)
1273 {
1274         closedown_active_slot(slot);
1275         if (slot->curl) {
1276                 xmulti_remove_handle(slot);
1277                 if (curl_session_count > min_curl_sessions) {
1278                         curl_easy_cleanup(slot->curl);
1279                         slot->curl = NULL;
1280                         curl_session_count--;
1281                 }
1282         }
1283 #ifdef USE_CURL_MULTI
1284         fill_active_slots();
1285 #endif
1286 }
1287
1288 void finish_all_active_slots(void)
1289 {
1290         struct active_request_slot *slot = active_queue_head;
1291
1292         while (slot != NULL)
1293                 if (slot->in_use) {
1294                         run_active_slot(slot);
1295                         slot = active_queue_head;
1296                 } else {
1297                         slot = slot->next;
1298                 }
1299 }
1300
1301 /* Helpers for modifying and creating URLs */
1302 static inline int needs_quote(int ch)
1303 {
1304         if (((ch >= 'A') && (ch <= 'Z'))
1305                         || ((ch >= 'a') && (ch <= 'z'))
1306                         || ((ch >= '0') && (ch <= '9'))
1307                         || (ch == '/')
1308                         || (ch == '-')
1309                         || (ch == '.'))
1310                 return 0;
1311         return 1;
1312 }
1313
1314 static char *quote_ref_url(const char *base, const char *ref)
1315 {
1316         struct strbuf buf = STRBUF_INIT;
1317         const char *cp;
1318         int ch;
1319
1320         end_url_with_slash(&buf, base);
1321
1322         for (cp = ref; (ch = *cp) != 0; cp++)
1323                 if (needs_quote(ch))
1324                         strbuf_addf(&buf, "%%%02x", ch);
1325                 else
1326                         strbuf_addch(&buf, *cp);
1327
1328         return strbuf_detach(&buf, NULL);
1329 }
1330
1331 void append_remote_object_url(struct strbuf *buf, const char *url,
1332                               const char *hex,
1333                               int only_two_digit_prefix)
1334 {
1335         end_url_with_slash(buf, url);
1336
1337         strbuf_addf(buf, "objects/%.*s/", 2, hex);
1338         if (!only_two_digit_prefix)
1339                 strbuf_addstr(buf, hex + 2);
1340 }
1341
1342 char *get_remote_object_url(const char *url, const char *hex,
1343                             int only_two_digit_prefix)
1344 {
1345         struct strbuf buf = STRBUF_INIT;
1346         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1347         return strbuf_detach(&buf, NULL);
1348 }
1349
1350 static int handle_curl_result(struct slot_results *results)
1351 {
1352         /*
1353          * If we see a failing http code with CURLE_OK, we have turned off
1354          * FAILONERROR (to keep the server's custom error response), and should
1355          * translate the code into failure here.
1356          *
1357          * Likewise, if we see a redirect (30x code), that means we turned off
1358          * redirect-following, and we should treat the result as an error.
1359          */
1360         if (results->curl_result == CURLE_OK &&
1361             results->http_code >= 300) {
1362                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1363                 /*
1364                  * Normally curl will already have put the "reason phrase"
1365                  * from the server into curl_errorstr; unfortunately without
1366                  * FAILONERROR it is lost, so we can give only the numeric
1367                  * status code.
1368                  */
1369                 snprintf(curl_errorstr, sizeof(curl_errorstr),
1370                          "The requested URL returned error: %ld",
1371                          results->http_code);
1372         }
1373
1374         if (results->curl_result == CURLE_OK) {
1375                 credential_approve(&http_auth);
1376                 if (proxy_auth.password)
1377                         credential_approve(&proxy_auth);
1378                 return HTTP_OK;
1379         } else if (missing_target(results))
1380                 return HTTP_MISSING_TARGET;
1381         else if (results->http_code == 401) {
1382                 if (http_auth.username && http_auth.password) {
1383                         credential_reject(&http_auth);
1384                         return HTTP_NOAUTH;
1385                 } else {
1386 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1387                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1388                         if (results->auth_avail) {
1389                                 http_auth_methods &= results->auth_avail;
1390                                 http_auth_methods_restricted = 1;
1391                         }
1392 #endif
1393                         return HTTP_REAUTH;
1394                 }
1395         } else {
1396                 if (results->http_connectcode == 407)
1397                         credential_reject(&proxy_auth);
1398 #if LIBCURL_VERSION_NUM >= 0x070c00
1399                 if (!curl_errorstr[0])
1400                         strlcpy(curl_errorstr,
1401                                 curl_easy_strerror(results->curl_result),
1402                                 sizeof(curl_errorstr));
1403 #endif
1404                 return HTTP_ERROR;
1405         }
1406 }
1407
1408 int run_one_slot(struct active_request_slot *slot,
1409                  struct slot_results *results)
1410 {
1411         slot->results = results;
1412         if (!start_active_slot(slot)) {
1413                 snprintf(curl_errorstr, sizeof(curl_errorstr),
1414                          "failed to start HTTP request");
1415                 return HTTP_START_FAILED;
1416         }
1417
1418         run_active_slot(slot);
1419         return handle_curl_result(results);
1420 }
1421
1422 struct curl_slist *http_copy_default_headers(void)
1423 {
1424         struct curl_slist *headers = NULL, *h;
1425
1426         for (h = extra_http_headers; h; h = h->next)
1427                 headers = curl_slist_append(headers, h->data);
1428
1429         return headers;
1430 }
1431
1432 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1433 {
1434         char *ptr;
1435         CURLcode ret;
1436
1437         strbuf_reset(buf);
1438         ret = curl_easy_getinfo(curl, info, &ptr);
1439         if (!ret && ptr)
1440                 strbuf_addstr(buf, ptr);
1441         return ret;
1442 }
1443
1444 /*
1445  * Check for and extract a content-type parameter. "raw"
1446  * should be positioned at the start of the potential
1447  * parameter, with any whitespace already removed.
1448  *
1449  * "name" is the name of the parameter. The value is appended
1450  * to "out".
1451  */
1452 static int extract_param(const char *raw, const char *name,
1453                          struct strbuf *out)
1454 {
1455         size_t len = strlen(name);
1456
1457         if (strncasecmp(raw, name, len))
1458                 return -1;
1459         raw += len;
1460
1461         if (*raw != '=')
1462                 return -1;
1463         raw++;
1464
1465         while (*raw && !isspace(*raw) && *raw != ';')
1466                 strbuf_addch(out, *raw++);
1467         return 0;
1468 }
1469
1470 /*
1471  * Extract a normalized version of the content type, with any
1472  * spaces suppressed, all letters lowercased, and no trailing ";"
1473  * or parameters.
1474  *
1475  * Note that we will silently remove even invalid whitespace. For
1476  * example, "text / plain" is specifically forbidden by RFC 2616,
1477  * but "text/plain" is the only reasonable output, and this keeps
1478  * our code simple.
1479  *
1480  * If the "charset" argument is not NULL, store the value of any
1481  * charset parameter there.
1482  *
1483  * Example:
1484  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1485  *   "text / plain" -> "text/plain"
1486  */
1487 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1488                                  struct strbuf *charset)
1489 {
1490         const char *p;
1491
1492         strbuf_reset(type);
1493         strbuf_grow(type, raw->len);
1494         for (p = raw->buf; *p; p++) {
1495                 if (isspace(*p))
1496                         continue;
1497                 if (*p == ';') {
1498                         p++;
1499                         break;
1500                 }
1501                 strbuf_addch(type, tolower(*p));
1502         }
1503
1504         if (!charset)
1505                 return;
1506
1507         strbuf_reset(charset);
1508         while (*p) {
1509                 while (isspace(*p) || *p == ';')
1510                         p++;
1511                 if (!extract_param(p, "charset", charset))
1512                         return;
1513                 while (*p && !isspace(*p))
1514                         p++;
1515         }
1516
1517         if (!charset->len && starts_with(type->buf, "text/"))
1518                 strbuf_addstr(charset, "ISO-8859-1");
1519 }
1520
1521 static void write_accept_language(struct strbuf *buf)
1522 {
1523         /*
1524          * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1525          * that, q-value will be smaller than 0.001, the minimum q-value the
1526          * HTTP specification allows. See
1527          * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1528          */
1529         const int MAX_DECIMAL_PLACES = 3;
1530         const int MAX_LANGUAGE_TAGS = 1000;
1531         const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1532         char **language_tags = NULL;
1533         int num_langs = 0;
1534         const char *s = get_preferred_languages();
1535         int i;
1536         struct strbuf tag = STRBUF_INIT;
1537
1538         /* Don't add Accept-Language header if no language is preferred. */
1539         if (!s)
1540                 return;
1541
1542         /*
1543          * Split the colon-separated string of preferred languages into
1544          * language_tags array.
1545          */
1546         do {
1547                 /* collect language tag */
1548                 for (; *s && (isalnum(*s) || *s == '_'); s++)
1549                         strbuf_addch(&tag, *s == '_' ? '-' : *s);
1550
1551                 /* skip .codeset, @modifier and any other unnecessary parts */
1552                 while (*s && *s != ':')
1553                         s++;
1554
1555                 if (tag.len) {
1556                         num_langs++;
1557                         REALLOC_ARRAY(language_tags, num_langs);
1558                         language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1559                         if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1560                                 break;
1561                 }
1562         } while (*s++);
1563
1564         /* write Accept-Language header into buf */
1565         if (num_langs) {
1566                 int last_buf_len = 0;
1567                 int max_q;
1568                 int decimal_places;
1569                 char q_format[32];
1570
1571                 /* add '*' */
1572                 REALLOC_ARRAY(language_tags, num_langs + 1);
1573                 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1574
1575                 /* compute decimal_places */
1576                 for (max_q = 1, decimal_places = 0;
1577                      max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1578                      decimal_places++, max_q *= 10)
1579                         ;
1580
1581                 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1582
1583                 strbuf_addstr(buf, "Accept-Language: ");
1584
1585                 for (i = 0; i < num_langs; i++) {
1586                         if (i > 0)
1587                                 strbuf_addstr(buf, ", ");
1588
1589                         strbuf_addstr(buf, language_tags[i]);
1590
1591                         if (i > 0)
1592                                 strbuf_addf(buf, q_format, max_q - i);
1593
1594                         if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1595                                 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1596                                 break;
1597                         }
1598
1599                         last_buf_len = buf->len;
1600                 }
1601         }
1602
1603         /* free language tags -- last one is a static '*' */
1604         for (i = 0; i < num_langs - 1; i++)
1605                 free(language_tags[i]);
1606         free(language_tags);
1607 }
1608
1609 /*
1610  * Get an Accept-Language header which indicates user's preferred languages.
1611  *
1612  * Examples:
1613  *   LANGUAGE= -> ""
1614  *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1615  *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1616  *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1617  *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1618  *   LANGUAGE= LANG=C -> ""
1619  */
1620 static const char *get_accept_language(void)
1621 {
1622         if (!cached_accept_language) {
1623                 struct strbuf buf = STRBUF_INIT;
1624                 write_accept_language(&buf);
1625                 if (buf.len > 0)
1626                         cached_accept_language = strbuf_detach(&buf, NULL);
1627         }
1628
1629         return cached_accept_language;
1630 }
1631
1632 static void http_opt_request_remainder(CURL *curl, off_t pos)
1633 {
1634         char buf[128];
1635         xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1636         curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1637 }
1638
1639 /* http_request() targets */
1640 #define HTTP_REQUEST_STRBUF     0
1641 #define HTTP_REQUEST_FILE       1
1642
1643 static int http_request(const char *url,
1644                         void *result, int target,
1645                         const struct http_get_options *options)
1646 {
1647         struct active_request_slot *slot;
1648         struct slot_results results;
1649         struct curl_slist *headers = http_copy_default_headers();
1650         struct strbuf buf = STRBUF_INIT;
1651         const char *accept_language;
1652         int ret;
1653
1654         slot = get_active_slot();
1655         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1656
1657         if (result == NULL) {
1658                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1659         } else {
1660                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1661                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1662
1663                 if (target == HTTP_REQUEST_FILE) {
1664                         off_t posn = ftello(result);
1665                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1666                                          fwrite);
1667                         if (posn > 0)
1668                                 http_opt_request_remainder(slot->curl, posn);
1669                 } else
1670                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1671                                          fwrite_buffer);
1672         }
1673
1674         accept_language = get_accept_language();
1675
1676         if (accept_language)
1677                 headers = curl_slist_append(headers, accept_language);
1678
1679         strbuf_addstr(&buf, "Pragma:");
1680         if (options && options->no_cache)
1681                 strbuf_addstr(&buf, " no-cache");
1682         if (options && options->keep_error)
1683                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1684         if (options && options->initial_request &&
1685             http_follow_config == HTTP_FOLLOW_INITIAL)
1686                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1687
1688         headers = curl_slist_append(headers, buf.buf);
1689
1690         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1691         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1692         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1693
1694         ret = run_one_slot(slot, &results);
1695
1696         if (options && options->content_type) {
1697                 struct strbuf raw = STRBUF_INIT;
1698                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1699                 extract_content_type(&raw, options->content_type,
1700                                      options->charset);
1701                 strbuf_release(&raw);
1702         }
1703
1704         if (options && options->effective_url)
1705                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1706                                 options->effective_url);
1707
1708         curl_slist_free_all(headers);
1709         strbuf_release(&buf);
1710
1711         return ret;
1712 }
1713
1714 /*
1715  * Update the "base" url to a more appropriate value, as deduced by
1716  * redirects seen when requesting a URL starting with "url".
1717  *
1718  * The "asked" parameter is a URL that we asked curl to access, and must begin
1719  * with "base".
1720  *
1721  * The "got" parameter is the URL that curl reported to us as where we ended
1722  * up.
1723  *
1724  * Returns 1 if we updated the base url, 0 otherwise.
1725  *
1726  * Our basic strategy is to compare "base" and "asked" to find the bits
1727  * specific to our request. We then strip those bits off of "got" to yield the
1728  * new base. So for example, if our base is "http://example.com/foo.git",
1729  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1730  * with "https://other.example.com/foo.git/info/refs". We would want the
1731  * new URL to become "https://other.example.com/foo.git".
1732  *
1733  * Note that this assumes a sane redirect scheme. It's entirely possible
1734  * in the example above to end up at a URL that does not even end in
1735  * "info/refs".  In such a case we die. There's not much we can do, such a
1736  * scheme is unlikely to represent a real git repository, and failing to
1737  * rewrite the base opens options for malicious redirects to do funny things.
1738  */
1739 static int update_url_from_redirect(struct strbuf *base,
1740                                     const char *asked,
1741                                     const struct strbuf *got)
1742 {
1743         const char *tail;
1744         size_t new_len;
1745
1746         if (!strcmp(asked, got->buf))
1747                 return 0;
1748
1749         if (!skip_prefix(asked, base->buf, &tail))
1750                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1751                     asked, base->buf);
1752
1753         new_len = got->len;
1754         if (!strip_suffix_mem(got->buf, &new_len, tail))
1755                 die(_("unable to update url base from redirection:\n"
1756                       "  asked for: %s\n"
1757                       "   redirect: %s"),
1758                     asked, got->buf);
1759
1760         strbuf_reset(base);
1761         strbuf_add(base, got->buf, new_len);
1762
1763         return 1;
1764 }
1765
1766 static int http_request_reauth(const char *url,
1767                                void *result, int target,
1768                                struct http_get_options *options)
1769 {
1770         int ret = http_request(url, result, target, options);
1771
1772         if (ret != HTTP_OK && ret != HTTP_REAUTH)
1773                 return ret;
1774
1775         if (options && options->effective_url && options->base_url) {
1776                 if (update_url_from_redirect(options->base_url,
1777                                              url, options->effective_url)) {
1778                         credential_from_url(&http_auth, options->base_url->buf);
1779                         url = options->effective_url->buf;
1780                 }
1781         }
1782
1783         if (ret != HTTP_REAUTH)
1784                 return ret;
1785
1786         /*
1787          * If we are using KEEP_ERROR, the previous request may have
1788          * put cruft into our output stream; we should clear it out before
1789          * making our next request. We only know how to do this for
1790          * the strbuf case, but that is enough to satisfy current callers.
1791          */
1792         if (options && options->keep_error) {
1793                 switch (target) {
1794                 case HTTP_REQUEST_STRBUF:
1795                         strbuf_reset(result);
1796                         break;
1797                 default:
1798                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1799                 }
1800         }
1801
1802         credential_fill(&http_auth);
1803
1804         return http_request(url, result, target, options);
1805 }
1806
1807 int http_get_strbuf(const char *url,
1808                     struct strbuf *result,
1809                     struct http_get_options *options)
1810 {
1811         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1812 }
1813
1814 /*
1815  * Downloads a URL and stores the result in the given file.
1816  *
1817  * If a previous interrupted download is detected (i.e. a previous temporary
1818  * file is still around) the download is resumed.
1819  */
1820 static int http_get_file(const char *url, const char *filename,
1821                          struct http_get_options *options)
1822 {
1823         int ret;
1824         struct strbuf tmpfile = STRBUF_INIT;
1825         FILE *result;
1826
1827         strbuf_addf(&tmpfile, "%s.temp", filename);
1828         result = fopen(tmpfile.buf, "a");
1829         if (!result) {
1830                 error("Unable to open local file %s", tmpfile.buf);
1831                 ret = HTTP_ERROR;
1832                 goto cleanup;
1833         }
1834
1835         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1836         fclose(result);
1837
1838         if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1839                 ret = HTTP_ERROR;
1840 cleanup:
1841         strbuf_release(&tmpfile);
1842         return ret;
1843 }
1844
1845 int http_fetch_ref(const char *base, struct ref *ref)
1846 {
1847         struct http_get_options options = {0};
1848         char *url;
1849         struct strbuf buffer = STRBUF_INIT;
1850         int ret = -1;
1851
1852         options.no_cache = 1;
1853
1854         url = quote_ref_url(base, ref->name);
1855         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1856                 strbuf_rtrim(&buffer);
1857                 if (buffer.len == 40)
1858                         ret = get_oid_hex(buffer.buf, &ref->old_oid);
1859                 else if (starts_with(buffer.buf, "ref: ")) {
1860                         ref->symref = xstrdup(buffer.buf + 5);
1861                         ret = 0;
1862                 }
1863         }
1864
1865         strbuf_release(&buffer);
1866         free(url);
1867         return ret;
1868 }
1869
1870 /* Helpers for fetching packs */
1871 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1872 {
1873         char *url, *tmp;
1874         struct strbuf buf = STRBUF_INIT;
1875
1876         if (http_is_verbose)
1877                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1878
1879         end_url_with_slash(&buf, base_url);
1880         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1881         url = strbuf_detach(&buf, NULL);
1882
1883         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1884         tmp = strbuf_detach(&buf, NULL);
1885
1886         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1887                 error("Unable to get pack index %s", url);
1888                 free(tmp);
1889                 tmp = NULL;
1890         }
1891
1892         free(url);
1893         return tmp;
1894 }
1895
1896 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1897         unsigned char *sha1, const char *base_url)
1898 {
1899         struct packed_git *new_pack;
1900         char *tmp_idx = NULL;
1901         int ret;
1902
1903         if (has_pack_index(sha1)) {
1904                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1905                 if (!new_pack)
1906                         return -1; /* parse_pack_index() already issued error message */
1907                 goto add_pack;
1908         }
1909
1910         tmp_idx = fetch_pack_index(sha1, base_url);
1911         if (!tmp_idx)
1912                 return -1;
1913
1914         new_pack = parse_pack_index(sha1, tmp_idx);
1915         if (!new_pack) {
1916                 unlink(tmp_idx);
1917                 free(tmp_idx);
1918
1919                 return -1; /* parse_pack_index() already issued error message */
1920         }
1921
1922         ret = verify_pack_index(new_pack);
1923         if (!ret) {
1924                 close_pack_index(new_pack);
1925                 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1926         }
1927         free(tmp_idx);
1928         if (ret)
1929                 return -1;
1930
1931 add_pack:
1932         new_pack->next = *packs_head;
1933         *packs_head = new_pack;
1934         return 0;
1935 }
1936
1937 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1938 {
1939         struct http_get_options options = {0};
1940         int ret = 0, i = 0;
1941         char *url, *data;
1942         struct strbuf buf = STRBUF_INIT;
1943         unsigned char sha1[20];
1944
1945         end_url_with_slash(&buf, base_url);
1946         strbuf_addstr(&buf, "objects/info/packs");
1947         url = strbuf_detach(&buf, NULL);
1948
1949         options.no_cache = 1;
1950         ret = http_get_strbuf(url, &buf, &options);
1951         if (ret != HTTP_OK)
1952                 goto cleanup;
1953
1954         data = buf.buf;
1955         while (i < buf.len) {
1956                 switch (data[i]) {
1957                 case 'P':
1958                         i++;
1959                         if (i + 52 <= buf.len &&
1960                             starts_with(data + i, " pack-") &&
1961                             starts_with(data + i + 46, ".pack\n")) {
1962                                 get_sha1_hex(data + i + 6, sha1);
1963                                 fetch_and_setup_pack_index(packs_head, sha1,
1964                                                       base_url);
1965                                 i += 51;
1966                                 break;
1967                         }
1968                 default:
1969                         while (i < buf.len && data[i] != '\n')
1970                                 i++;
1971                 }
1972                 i++;
1973         }
1974
1975 cleanup:
1976         free(url);
1977         return ret;
1978 }
1979
1980 void release_http_pack_request(struct http_pack_request *preq)
1981 {
1982         if (preq->packfile != NULL) {
1983                 fclose(preq->packfile);
1984                 preq->packfile = NULL;
1985         }
1986         preq->slot = NULL;
1987         free(preq->url);
1988         free(preq);
1989 }
1990
1991 int finish_http_pack_request(struct http_pack_request *preq)
1992 {
1993         struct packed_git **lst;
1994         struct packed_git *p = preq->target;
1995         char *tmp_idx;
1996         size_t len;
1997         struct child_process ip = CHILD_PROCESS_INIT;
1998         const char *ip_argv[8];
1999
2000         close_pack_index(p);
2001
2002         fclose(preq->packfile);
2003         preq->packfile = NULL;
2004
2005         lst = preq->lst;
2006         while (*lst != p)
2007                 lst = &((*lst)->next);
2008         *lst = (*lst)->next;
2009
2010         if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2011                 die("BUG: pack tmpfile does not end in .pack.temp?");
2012         tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2013
2014         ip_argv[0] = "index-pack";
2015         ip_argv[1] = "-o";
2016         ip_argv[2] = tmp_idx;
2017         ip_argv[3] = preq->tmpfile;
2018         ip_argv[4] = NULL;
2019
2020         ip.argv = ip_argv;
2021         ip.git_cmd = 1;
2022         ip.no_stdin = 1;
2023         ip.no_stdout = 1;
2024
2025         if (run_command(&ip)) {
2026                 unlink(preq->tmpfile);
2027                 unlink(tmp_idx);
2028                 free(tmp_idx);
2029                 return -1;
2030         }
2031
2032         unlink(sha1_pack_index_name(p->sha1));
2033
2034         if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2035          || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2036                 free(tmp_idx);
2037                 return -1;
2038         }
2039
2040         install_packed_git(p);
2041         free(tmp_idx);
2042         return 0;
2043 }
2044
2045 struct http_pack_request *new_http_pack_request(
2046         struct packed_git *target, const char *base_url)
2047 {
2048         off_t prev_posn = 0;
2049         struct strbuf buf = STRBUF_INIT;
2050         struct http_pack_request *preq;
2051
2052         preq = xcalloc(1, sizeof(*preq));
2053         preq->target = target;
2054
2055         end_url_with_slash(&buf, base_url);
2056         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2057                 sha1_to_hex(target->sha1));
2058         preq->url = strbuf_detach(&buf, NULL);
2059
2060         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2061                 sha1_pack_name(target->sha1));
2062         preq->packfile = fopen(preq->tmpfile, "a");
2063         if (!preq->packfile) {
2064                 error("Unable to open local file %s for pack",
2065                       preq->tmpfile);
2066                 goto abort;
2067         }
2068
2069         preq->slot = get_active_slot();
2070         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2071         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2072         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2073         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2074                 no_pragma_header);
2075
2076         /*
2077          * If there is data present from a previous transfer attempt,
2078          * resume where it left off
2079          */
2080         prev_posn = ftello(preq->packfile);
2081         if (prev_posn>0) {
2082                 if (http_is_verbose)
2083                         fprintf(stderr,
2084                                 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2085                                 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2086                 http_opt_request_remainder(preq->slot->curl, prev_posn);
2087         }
2088
2089         return preq;
2090
2091 abort:
2092         free(preq->url);
2093         free(preq);
2094         return NULL;
2095 }
2096
2097 /* Helpers for fetching objects (loose) */
2098 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2099                                void *data)
2100 {
2101         unsigned char expn[4096];
2102         size_t size = eltsize * nmemb;
2103         int posn = 0;
2104         struct http_object_request *freq = data;
2105         struct active_request_slot *slot = freq->slot;
2106
2107         if (slot) {
2108                 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2109                                                 &slot->http_code);
2110                 if (c != CURLE_OK)
2111                         die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2112                                 curl_easy_strerror(c));
2113                 if (slot->http_code >= 300)
2114                         return size;
2115         }
2116
2117         do {
2118                 ssize_t retval = xwrite(freq->localfile,
2119                                         (char *) ptr + posn, size - posn);
2120                 if (retval < 0)
2121                         return posn;
2122                 posn += retval;
2123         } while (posn < size);
2124
2125         freq->stream.avail_in = size;
2126         freq->stream.next_in = (void *)ptr;
2127         do {
2128                 freq->stream.next_out = expn;
2129                 freq->stream.avail_out = sizeof(expn);
2130                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2131                 git_SHA1_Update(&freq->c, expn,
2132                                 sizeof(expn) - freq->stream.avail_out);
2133         } while (freq->stream.avail_in && freq->zret == Z_OK);
2134         return size;
2135 }
2136
2137 struct http_object_request *new_http_object_request(const char *base_url,
2138         unsigned char *sha1)
2139 {
2140         char *hex = sha1_to_hex(sha1);
2141         const char *filename;
2142         char prevfile[PATH_MAX];
2143         int prevlocal;
2144         char prev_buf[PREV_BUF_SIZE];
2145         ssize_t prev_read = 0;
2146         off_t prev_posn = 0;
2147         struct http_object_request *freq;
2148
2149         freq = xcalloc(1, sizeof(*freq));
2150         hashcpy(freq->sha1, sha1);
2151         freq->localfile = -1;
2152
2153         filename = sha1_file_name(sha1);
2154         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2155                  "%s.temp", filename);
2156
2157         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2158         unlink_or_warn(prevfile);
2159         rename(freq->tmpfile, prevfile);
2160         unlink_or_warn(freq->tmpfile);
2161
2162         if (freq->localfile != -1)
2163                 error("fd leakage in start: %d", freq->localfile);
2164         freq->localfile = open(freq->tmpfile,
2165                                O_WRONLY | O_CREAT | O_EXCL, 0666);
2166         /*
2167          * This could have failed due to the "lazy directory creation";
2168          * try to mkdir the last path component.
2169          */
2170         if (freq->localfile < 0 && errno == ENOENT) {
2171                 char *dir = strrchr(freq->tmpfile, '/');
2172                 if (dir) {
2173                         *dir = 0;
2174                         mkdir(freq->tmpfile, 0777);
2175                         *dir = '/';
2176                 }
2177                 freq->localfile = open(freq->tmpfile,
2178                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
2179         }
2180
2181         if (freq->localfile < 0) {
2182                 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2183                 goto abort;
2184         }
2185
2186         git_inflate_init(&freq->stream);
2187
2188         git_SHA1_Init(&freq->c);
2189
2190         freq->url = get_remote_object_url(base_url, hex, 0);
2191
2192         /*
2193          * If a previous temp file is present, process what was already
2194          * fetched.
2195          */
2196         prevlocal = open(prevfile, O_RDONLY);
2197         if (prevlocal != -1) {
2198                 do {
2199                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2200                         if (prev_read>0) {
2201                                 if (fwrite_sha1_file(prev_buf,
2202                                                      1,
2203                                                      prev_read,
2204                                                      freq) == prev_read) {
2205                                         prev_posn += prev_read;
2206                                 } else {
2207                                         prev_read = -1;
2208                                 }
2209                         }
2210                 } while (prev_read > 0);
2211                 close(prevlocal);
2212         }
2213         unlink_or_warn(prevfile);
2214
2215         /*
2216          * Reset inflate/SHA1 if there was an error reading the previous temp
2217          * file; also rewind to the beginning of the local file.
2218          */
2219         if (prev_read == -1) {
2220                 memset(&freq->stream, 0, sizeof(freq->stream));
2221                 git_inflate_init(&freq->stream);
2222                 git_SHA1_Init(&freq->c);
2223                 if (prev_posn>0) {
2224                         prev_posn = 0;
2225                         lseek(freq->localfile, 0, SEEK_SET);
2226                         if (ftruncate(freq->localfile, 0) < 0) {
2227                                 error_errno("Couldn't truncate temporary file %s",
2228                                             freq->tmpfile);
2229                                 goto abort;
2230                         }
2231                 }
2232         }
2233
2234         freq->slot = get_active_slot();
2235
2236         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2237         curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2238         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2239         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2240         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2241         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2242
2243         /*
2244          * If we have successfully processed data from a previous fetch
2245          * attempt, only fetch the data we don't already have.
2246          */
2247         if (prev_posn>0) {
2248                 if (http_is_verbose)
2249                         fprintf(stderr,
2250                                 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2251                                 hex, (uintmax_t)prev_posn);
2252                 http_opt_request_remainder(freq->slot->curl, prev_posn);
2253         }
2254
2255         return freq;
2256
2257 abort:
2258         free(freq->url);
2259         free(freq);
2260         return NULL;
2261 }
2262
2263 void process_http_object_request(struct http_object_request *freq)
2264 {
2265         if (freq->slot == NULL)
2266                 return;
2267         freq->curl_result = freq->slot->curl_result;
2268         freq->http_code = freq->slot->http_code;
2269         freq->slot = NULL;
2270 }
2271
2272 int finish_http_object_request(struct http_object_request *freq)
2273 {
2274         struct stat st;
2275
2276         close(freq->localfile);
2277         freq->localfile = -1;
2278
2279         process_http_object_request(freq);
2280
2281         if (freq->http_code == 416) {
2282                 warning("requested range invalid; we may already have all the data.");
2283         } else if (freq->curl_result != CURLE_OK) {
2284                 if (stat(freq->tmpfile, &st) == 0)
2285                         if (st.st_size == 0)
2286                                 unlink_or_warn(freq->tmpfile);
2287                 return -1;
2288         }
2289
2290         git_inflate_end(&freq->stream);
2291         git_SHA1_Final(freq->real_sha1, &freq->c);
2292         if (freq->zret != Z_STREAM_END) {
2293                 unlink_or_warn(freq->tmpfile);
2294                 return -1;
2295         }
2296         if (hashcmp(freq->sha1, freq->real_sha1)) {
2297                 unlink_or_warn(freq->tmpfile);
2298                 return -1;
2299         }
2300         freq->rename =
2301                 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2302
2303         return freq->rename;
2304 }
2305
2306 void abort_http_object_request(struct http_object_request *freq)
2307 {
2308         unlink_or_warn(freq->tmpfile);
2309
2310         release_http_object_request(freq);
2311 }
2312
2313 void release_http_object_request(struct http_object_request *freq)
2314 {
2315         if (freq->localfile != -1) {
2316                 close(freq->localfile);
2317                 freq->localfile = -1;
2318         }
2319         if (freq->url != NULL) {
2320                 free(freq->url);
2321                 freq->url = NULL;
2322         }
2323         if (freq->slot != NULL) {
2324                 freq->slot->callback_func = NULL;
2325                 freq->slot->callback_data = NULL;
2326                 release_active_slot(freq->slot);
2327                 freq->slot = NULL;
2328         }
2329 }