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 && curl_http_proxy[0] == '\0') {
 840                 /*
 841                  * Handle case with the empty http.proxy value here to keep
 842                  * common code clean.
 843                  * NB: empty option disables proxying at all.
 844                  */
 845                 curl_easy_setopt(result, CURLOPT_PROXY, "");
 846         } else if (curl_http_proxy) {
 847 #if LIBCURL_VERSION_NUM >= 0x071800
 848                 if (starts_with(curl_http_proxy, "socks5h"))
 849                         curl_easy_setopt(result,
 850                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
 851                 else if (starts_with(curl_http_proxy, "socks5"))
 852                         curl_easy_setopt(result,
 853                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
 854                 else if (starts_with(curl_http_proxy, "socks4a"))
 855                         curl_easy_setopt(result,
 856                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
 857                 else if (starts_with(curl_http_proxy, "socks"))
 858                         curl_easy_setopt(result,
 859                                 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
 860 #endif
 861                 if (strstr(curl_http_proxy, "://"))
 862                         credential_from_url(&proxy_auth, curl_http_proxy);
 863                 else {
 864                         struct strbuf url = STRBUF_INIT;
 865                         strbuf_addf(&url, "http://%s", curl_http_proxy);
 866                         credential_from_url(&proxy_auth, url.buf);
 867                         strbuf_release(&url);
 868                 }
 869
 870                 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
 871 #if LIBCURL_VERSION_NUM >= 0x071304
 872                 var_override(&curl_no_proxy, getenv("NO_PROXY"));
 873                 var_override(&curl_no_proxy, getenv("no_proxy"));
 874                 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
 875 #endif
 876         }
 877         init_curl_proxy_auth(result);
 878
 879         set_curl_keepalive(result);
 880
 881         return result;
 882 }
 883
 884 static void set_from_env(const char **var, const char *envname)
 885 {
 886         const char *val = getenv(envname);
 887         if (val)
 888                 *var = val;
 889 }
 890
 891 void http_init(struct remote *remote, const char *url, int proactive_auth)
 892 {
 893         char *low_speed_limit;
 894         char *low_speed_time;
 895         char *normalized_url;
 896         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 897
 898         config.section = "http";
 899         config.key = NULL;
 900         config.collect_fn = http_options;
 901         config.cascade_fn = git_default_config;
 902         config.cb = NULL;
 903
 904         http_is_verbose = 0;
 905         normalized_url = url_normalize(url, &config.url);
 906
 907         git_config(urlmatch_config_entry, &config);
 908         free(normalized_url);
 909
 910         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 911                 die("curl_global_init failed");
 912
 913         http_proactive_auth = proactive_auth;
 914
 915         if (remote && remote->http_proxy)
 916                 curl_http_proxy = xstrdup(remote->http_proxy);
 917
 918         if (remote)
 919                 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
 920
 921         pragma_header = curl_slist_append(http_copy_default_headers(),
 922                 "Pragma: no-cache");
 923         no_pragma_header = curl_slist_append(http_copy_default_headers(),
 924                 "Pragma:");
 925
 926 #ifdef USE_CURL_MULTI
 927         {
 928                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 929                 if (http_max_requests != NULL)
 930                         max_requests = atoi(http_max_requests);
 931         }
 932
 933         curlm = curl_multi_init();
 934         if (!curlm)
 935                 die("curl_multi_init failed");
 936 #endif
 937
 938         if (getenv("GIT_SSL_NO_VERIFY"))
 939                 curl_ssl_verify = 0;
 940
 941         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 942 #if LIBCURL_VERSION_NUM >= 0x070903
 943         set_from_env(&ssl_key, "GIT_SSL_KEY");
 944 #endif
 945 #if LIBCURL_VERSION_NUM >= 0x070908
 946         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 947 #endif
 948         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 949
 950         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 951
 952         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 953         if (low_speed_limit != NULL)
 954                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 955         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 956         if (low_speed_time != NULL)
 957                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 958
 959         if (curl_ssl_verify == -1)
 960                 curl_ssl_verify = 1;
 961
 962         curl_session_count = 0;
 963 #ifdef USE_CURL_MULTI
 964         if (max_requests < 1)
 965                 max_requests = DEFAULT_MAX_REQUESTS;
 966 #endif
 967
 968         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 969                 curl_ftp_no_epsv = 1;
 970
 971         if (url) {
 972                 credential_from_url(&http_auth, url);
 973                 if (!ssl_cert_password_required &&
 974                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 975                     starts_with(url, "https://"))
 976                         ssl_cert_password_required = 1;
 977         }
 978
 979 #ifndef NO_CURL_EASY_DUPHANDLE
 980         curl_default = get_curl_handle();
 981 #endif
 982 }
 983
 984 void http_cleanup(void)
 985 {
 986         struct active_request_slot *slot = active_queue_head;
 987
 988         while (slot != NULL) {
 989                 struct active_request_slot *next = slot->next;
 990                 if (slot->curl != NULL) {
 991                         xmulti_remove_handle(slot);
 992                         curl_easy_cleanup(slot->curl);
 993                 }
 994                 free(slot);
 995                 slot = next;
 996         }
 997         active_queue_head = NULL;
 998
 999 #ifndef NO_CURL_EASY_DUPHANDLE
1000         curl_easy_cleanup(curl_default);
1001 #endif
1002
1003 #ifdef USE_CURL_MULTI
1004         curl_multi_cleanup(curlm);
1005 #endif
1006         curl_global_cleanup();
1007
1008         curl_slist_free_all(extra_http_headers);
1009         extra_http_headers = NULL;
1010
1011         curl_slist_free_all(pragma_header);
1012         pragma_header = NULL;
1013
1014         curl_slist_free_all(no_pragma_header);
1015         no_pragma_header = NULL;
1016
1017         if (curl_http_proxy) {
1018                 free((void *)curl_http_proxy);
1019                 curl_http_proxy = NULL;
1020         }
1021
1022         if (proxy_auth.password) {
1023                 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1024                 free(proxy_auth.password);
1025                 proxy_auth.password = NULL;
1026         }
1027
1028         free((void *)curl_proxyuserpwd);
1029         curl_proxyuserpwd = NULL;
1030
1031         free((void *)http_proxy_authmethod);
1032         http_proxy_authmethod = NULL;
1033
1034         if (cert_auth.password != NULL) {
1035                 memset(cert_auth.password, 0, strlen(cert_auth.password));
1036                 free(cert_auth.password);
1037                 cert_auth.password = NULL;
1038         }
1039         ssl_cert_password_required = 0;
1040
1041         free(cached_accept_language);
1042         cached_accept_language = NULL;
1043 }
1044
1045 struct active_request_slot *get_active_slot(void)
1046 {
1047         struct active_request_slot *slot = active_queue_head;
1048         struct active_request_slot *newslot;
1049
1050 #ifdef USE_CURL_MULTI
1051         int num_transfers;
1052
1053         /* Wait for a slot to open up if the queue is full */
1054         while (active_requests >= max_requests) {
1055                 curl_multi_perform(curlm, &num_transfers);
1056                 if (num_transfers < active_requests)
1057                         process_curl_messages();
1058         }
1059 #endif
1060
1061         while (slot != NULL && slot->in_use)
1062                 slot = slot->next;
1063
1064         if (slot == NULL) {
1065                 newslot = xmalloc(sizeof(*newslot));
1066                 newslot->curl = NULL;
1067                 newslot->in_use = 0;
1068                 newslot->next = NULL;
1069
1070                 slot = active_queue_head;
1071                 if (slot == NULL) {
1072                         active_queue_head = newslot;
1073                 } else {
1074                         while (slot->next != NULL)
1075                                 slot = slot->next;
1076                         slot->next = newslot;
1077                 }
1078                 slot = newslot;
1079         }
1080
1081         if (slot->curl == NULL) {
1082 #ifdef NO_CURL_EASY_DUPHANDLE
1083                 slot->curl = get_curl_handle();
1084 #else
1085                 slot->curl = curl_easy_duphandle(curl_default);
1086 #endif
1087                 curl_session_count++;
1088         }
1089
1090         active_requests++;
1091         slot->in_use = 1;
1092         slot->results = NULL;
1093         slot->finished = NULL;
1094         slot->callback_data = NULL;
1095         slot->callback_func = NULL;
1096         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1097         if (curl_save_cookies)
1098                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1099         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1100         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1101         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1102         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1103         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1104         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1105         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1106         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1107         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1108         curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1109
1110         /*
1111          * Default following to off unless "ALWAYS" is configured; this gives
1112          * callers a sane starting point, and they can tweak for individual
1113          * HTTP_FOLLOW_* cases themselves.
1114          */
1115         if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1116                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1117         else
1118                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1119
1120 #if LIBCURL_VERSION_NUM >= 0x070a08
1121         curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1122 #endif
1123 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1124         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1125 #endif
1126         if (http_auth.password || curl_empty_auth_enabled())
1127                 init_curl_http_auth(slot->curl);
1128
1129         return slot;
1130 }
1131
1132 int start_active_slot(struct active_request_slot *slot)
1133 {
1134 #ifdef USE_CURL_MULTI
1135         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1136         int num_transfers;
1137
1138         if (curlm_result != CURLM_OK &&
1139             curlm_result != CURLM_CALL_MULTI_PERFORM) {
1140                 warning("curl_multi_add_handle failed: %s",
1141                         curl_multi_strerror(curlm_result));
1142                 active_requests--;
1143                 slot->in_use = 0;
1144                 return 0;
1145         }
1146
1147         /*
1148          * We know there must be something to do, since we just added
1149          * something.
1150          */
1151         curl_multi_perform(curlm, &num_transfers);
1152 #endif
1153         return 1;
1154 }
1155
1156 #ifdef USE_CURL_MULTI
1157 struct fill_chain {
1158         void *data;
1159         int (*fill)(void *);
1160         struct fill_chain *next;
1161 };
1162
1163 static struct fill_chain *fill_cfg;
1164
1165 void add_fill_function(void *data, int (*fill)(void *))
1166 {
1167         struct fill_chain *new = xmalloc(sizeof(*new));
1168         struct fill_chain **linkp = &fill_cfg;
1169         new->data = data;
1170         new->fill = fill;
1171         new->next = NULL;
1172         while (*linkp)
1173                 linkp = &(*linkp)->next;
1174         *linkp = new;
1175 }
1176
1177 void fill_active_slots(void)
1178 {
1179         struct active_request_slot *slot = active_queue_head;
1180
1181         while (active_requests < max_requests) {
1182                 struct fill_chain *fill;
1183                 for (fill = fill_cfg; fill; fill = fill->next)
1184                         if (fill->fill(fill->data))
1185                                 break;
1186
1187                 if (!fill)
1188                         break;
1189         }
1190
1191         while (slot != NULL) {
1192                 if (!slot->in_use && slot->curl != NULL
1193                         && curl_session_count > min_curl_sessions) {
1194                         curl_easy_cleanup(slot->curl);
1195                         slot->curl = NULL;
1196                         curl_session_count--;
1197                 }
1198                 slot = slot->next;
1199         }
1200 }
1201
1202 void step_active_slots(void)
1203 {
1204         int num_transfers;
1205         CURLMcode curlm_result;
1206
1207         do {
1208                 curlm_result = curl_multi_perform(curlm, &num_transfers);
1209         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1210         if (num_transfers < active_requests) {
1211                 process_curl_messages();
1212                 fill_active_slots();
1213         }
1214 }
1215 #endif
1216
1217 void run_active_slot(struct active_request_slot *slot)
1218 {
1219 #ifdef USE_CURL_MULTI
1220         fd_set readfds;
1221         fd_set writefds;
1222         fd_set excfds;
1223         int max_fd;
1224         struct timeval select_timeout;
1225         int finished = 0;
1226
1227         slot->finished = &finished;
1228         while (!finished) {
1229                 step_active_slots();
1230
1231                 if (slot->in_use) {
1232 #if LIBCURL_VERSION_NUM >= 0x070f04
1233                         long curl_timeout;
1234                         curl_multi_timeout(curlm, &curl_timeout);
1235                         if (curl_timeout == 0) {
1236                                 continue;
1237                         } else if (curl_timeout == -1) {
1238                                 select_timeout.tv_sec  = 0;
1239                                 select_timeout.tv_usec = 50000;
1240                         } else {
1241                                 select_timeout.tv_sec  =  curl_timeout / 1000;
1242                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1243                         }
1244 #else
1245                         select_timeout.tv_sec  = 0;
1246                         select_timeout.tv_usec = 50000;
1247 #endif
1248
1249                         max_fd = -1;
1250                         FD_ZERO(&readfds);
1251                         FD_ZERO(&writefds);
1252                         FD_ZERO(&excfds);
1253                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1254
1255                         /*
1256                          * It can happen that curl_multi_timeout returns a pathologically
1257                          * long timeout when curl_multi_fdset returns no file descriptors
1258                          * to read.  See commit message for more details.
1259                          */
1260                         if (max_fd < 0 &&
1261                             (select_timeout.tv_sec > 0 ||
1262                              select_timeout.tv_usec > 50000)) {
1263                                 select_timeout.tv_sec  = 0;
1264                                 select_timeout.tv_usec = 50000;
1265                         }
1266
1267                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1268                 }
1269         }
1270 #else
1271         while (slot->in_use) {
1272                 slot->curl_result = curl_easy_perform(slot->curl);
1273                 finish_active_slot(slot);
1274         }
1275 #endif
1276 }
1277
1278 static void release_active_slot(struct active_request_slot *slot)
1279 {
1280         closedown_active_slot(slot);
1281         if (slot->curl) {
1282                 xmulti_remove_handle(slot);
1283                 if (curl_session_count > min_curl_sessions) {
1284                         curl_easy_cleanup(slot->curl);
1285                         slot->curl = NULL;
1286                         curl_session_count--;
1287                 }
1288         }
1289 #ifdef USE_CURL_MULTI
1290         fill_active_slots();
1291 #endif
1292 }
1293
1294 void finish_all_active_slots(void)
1295 {
1296         struct active_request_slot *slot = active_queue_head;
1297
1298         while (slot != NULL)
1299                 if (slot->in_use) {
1300                         run_active_slot(slot);
1301                         slot = active_queue_head;
1302                 } else {
1303                         slot = slot->next;
1304                 }
1305 }
1306
1307 /* Helpers for modifying and creating URLs */
1308 static inline int needs_quote(int ch)
1309 {
1310         if (((ch >= 'A') && (ch <= 'Z'))
1311                         || ((ch >= 'a') && (ch <= 'z'))
1312                         || ((ch >= '0') && (ch <= '9'))
1313                         || (ch == '/')
1314                         || (ch == '-')
1315                         || (ch == '.'))
1316                 return 0;
1317         return 1;
1318 }
1319
1320 static char *quote_ref_url(const char *base, const char *ref)
1321 {
1322         struct strbuf buf = STRBUF_INIT;
1323         const char *cp;
1324         int ch;
1325
1326         end_url_with_slash(&buf, base);
1327
1328         for (cp = ref; (ch = *cp) != 0; cp++)
1329                 if (needs_quote(ch))
1330                         strbuf_addf(&buf, "%%%02x", ch);
1331                 else
1332                         strbuf_addch(&buf, *cp);
1333
1334         return strbuf_detach(&buf, NULL);
1335 }
1336
1337 void append_remote_object_url(struct strbuf *buf, const char *url,
1338                               const char *hex,
1339                               int only_two_digit_prefix)
1340 {
1341         end_url_with_slash(buf, url);
1342
1343         strbuf_addf(buf, "objects/%.*s/", 2, hex);
1344         if (!only_two_digit_prefix)
1345                 strbuf_addstr(buf, hex + 2);
1346 }
1347
1348 char *get_remote_object_url(const char *url, const char *hex,
1349                             int only_two_digit_prefix)
1350 {
1351         struct strbuf buf = STRBUF_INIT;
1352         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1353         return strbuf_detach(&buf, NULL);
1354 }
1355
1356 static int handle_curl_result(struct slot_results *results)
1357 {
1358         /*
1359          * If we see a failing http code with CURLE_OK, we have turned off
1360          * FAILONERROR (to keep the server's custom error response), and should
1361          * translate the code into failure here.
1362          *
1363          * Likewise, if we see a redirect (30x code), that means we turned off
1364          * redirect-following, and we should treat the result as an error.
1365          */
1366         if (results->curl_result == CURLE_OK &&
1367             results->http_code >= 300) {
1368                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1369                 /*
1370                  * Normally curl will already have put the "reason phrase"
1371                  * from the server into curl_errorstr; unfortunately without
1372                  * FAILONERROR it is lost, so we can give only the numeric
1373                  * status code.
1374                  */
1375                 snprintf(curl_errorstr, sizeof(curl_errorstr),
1376                          "The requested URL returned error: %ld",
1377                          results->http_code);
1378         }
1379
1380         if (results->curl_result == CURLE_OK) {
1381                 credential_approve(&http_auth);
1382                 if (proxy_auth.password)
1383                         credential_approve(&proxy_auth);
1384                 return HTTP_OK;
1385         } else if (missing_target(results))
1386                 return HTTP_MISSING_TARGET;
1387         else if (results->http_code == 401) {
1388                 if (http_auth.username && http_auth.password) {
1389                         credential_reject(&http_auth);
1390                         return HTTP_NOAUTH;
1391                 } else {
1392 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1393                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1394                         if (results->auth_avail) {
1395                                 http_auth_methods &= results->auth_avail;
1396                                 http_auth_methods_restricted = 1;
1397                         }
1398 #endif
1399                         return HTTP_REAUTH;
1400                 }
1401         } else {
1402                 if (results->http_connectcode == 407)
1403                         credential_reject(&proxy_auth);
1404 #if LIBCURL_VERSION_NUM >= 0x070c00
1405                 if (!curl_errorstr[0])
1406                         strlcpy(curl_errorstr,
1407                                 curl_easy_strerror(results->curl_result),
1408                                 sizeof(curl_errorstr));
1409 #endif
1410                 return HTTP_ERROR;
1411         }
1412 }
1413
1414 int run_one_slot(struct active_request_slot *slot,
1415                  struct slot_results *results)
1416 {
1417         slot->results = results;
1418         if (!start_active_slot(slot)) {
1419                 snprintf(curl_errorstr, sizeof(curl_errorstr),
1420                          "failed to start HTTP request");
1421                 return HTTP_START_FAILED;
1422         }
1423
1424         run_active_slot(slot);
1425         return handle_curl_result(results);
1426 }
1427
1428 struct curl_slist *http_copy_default_headers(void)
1429 {
1430         struct curl_slist *headers = NULL, *h;
1431
1432         for (h = extra_http_headers; h; h = h->next)
1433                 headers = curl_slist_append(headers, h->data);
1434
1435         return headers;
1436 }
1437
1438 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1439 {
1440         char *ptr;
1441         CURLcode ret;
1442
1443         strbuf_reset(buf);
1444         ret = curl_easy_getinfo(curl, info, &ptr);
1445         if (!ret && ptr)
1446                 strbuf_addstr(buf, ptr);
1447         return ret;
1448 }
1449
1450 /*
1451  * Check for and extract a content-type parameter. "raw"
1452  * should be positioned at the start of the potential
1453  * parameter, with any whitespace already removed.
1454  *
1455  * "name" is the name of the parameter. The value is appended
1456  * to "out".
1457  */
1458 static int extract_param(const char *raw, const char *name,
1459                          struct strbuf *out)
1460 {
1461         size_t len = strlen(name);
1462
1463         if (strncasecmp(raw, name, len))
1464                 return -1;
1465         raw += len;
1466
1467         if (*raw != '=')
1468                 return -1;
1469         raw++;
1470
1471         while (*raw && !isspace(*raw) && *raw != ';')
1472                 strbuf_addch(out, *raw++);
1473         return 0;
1474 }
1475
1476 /*
1477  * Extract a normalized version of the content type, with any
1478  * spaces suppressed, all letters lowercased, and no trailing ";"
1479  * or parameters.
1480  *
1481  * Note that we will silently remove even invalid whitespace. For
1482  * example, "text / plain" is specifically forbidden by RFC 2616,
1483  * but "text/plain" is the only reasonable output, and this keeps
1484  * our code simple.
1485  *
1486  * If the "charset" argument is not NULL, store the value of any
1487  * charset parameter there.
1488  *
1489  * Example:
1490  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1491  *   "text / plain" -> "text/plain"
1492  */
1493 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1494                                  struct strbuf *charset)
1495 {
1496         const char *p;
1497
1498         strbuf_reset(type);
1499         strbuf_grow(type, raw->len);
1500         for (p = raw->buf; *p; p++) {
1501                 if (isspace(*p))
1502                         continue;
1503                 if (*p == ';') {
1504                         p++;
1505                         break;
1506                 }
1507                 strbuf_addch(type, tolower(*p));
1508         }
1509
1510         if (!charset)
1511                 return;
1512
1513         strbuf_reset(charset);
1514         while (*p) {
1515                 while (isspace(*p) || *p == ';')
1516                         p++;
1517                 if (!extract_param(p, "charset", charset))
1518                         return;
1519                 while (*p && !isspace(*p))
1520                         p++;
1521         }
1522
1523         if (!charset->len && starts_with(type->buf, "text/"))
1524                 strbuf_addstr(charset, "ISO-8859-1");
1525 }
1526
1527 static void write_accept_language(struct strbuf *buf)
1528 {
1529         /*
1530          * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1531          * that, q-value will be smaller than 0.001, the minimum q-value the
1532          * HTTP specification allows. See
1533          * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1534          */
1535         const int MAX_DECIMAL_PLACES = 3;
1536         const int MAX_LANGUAGE_TAGS = 1000;
1537         const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1538         char **language_tags = NULL;
1539         int num_langs = 0;
1540         const char *s = get_preferred_languages();
1541         int i;
1542         struct strbuf tag = STRBUF_INIT;
1543
1544         /* Don't add Accept-Language header if no language is preferred. */
1545         if (!s)
1546                 return;
1547
1548         /*
1549          * Split the colon-separated string of preferred languages into
1550          * language_tags array.
1551          */
1552         do {
1553                 /* collect language tag */
1554                 for (; *s && (isalnum(*s) || *s == '_'); s++)
1555                         strbuf_addch(&tag, *s == '_' ? '-' : *s);
1556
1557                 /* skip .codeset, @modifier and any other unnecessary parts */
1558                 while (*s && *s != ':')
1559                         s++;
1560
1561                 if (tag.len) {
1562                         num_langs++;
1563                         REALLOC_ARRAY(language_tags, num_langs);
1564                         language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1565                         if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1566                                 break;
1567                 }
1568         } while (*s++);
1569
1570         /* write Accept-Language header into buf */
1571         if (num_langs) {
1572                 int last_buf_len = 0;
1573                 int max_q;
1574                 int decimal_places;
1575                 char q_format[32];
1576
1577                 /* add '*' */
1578                 REALLOC_ARRAY(language_tags, num_langs + 1);
1579                 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1580
1581                 /* compute decimal_places */
1582                 for (max_q = 1, decimal_places = 0;
1583                      max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1584                      decimal_places++, max_q *= 10)
1585                         ;
1586
1587                 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1588
1589                 strbuf_addstr(buf, "Accept-Language: ");
1590
1591                 for (i = 0; i < num_langs; i++) {
1592                         if (i > 0)
1593                                 strbuf_addstr(buf, ", ");
1594
1595                         strbuf_addstr(buf, language_tags[i]);
1596
1597                         if (i > 0)
1598                                 strbuf_addf(buf, q_format, max_q - i);
1599
1600                         if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1601                                 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1602                                 break;
1603                         }
1604
1605                         last_buf_len = buf->len;
1606                 }
1607         }
1608
1609         /* free language tags -- last one is a static '*' */
1610         for (i = 0; i < num_langs - 1; i++)
1611                 free(language_tags[i]);
1612         free(language_tags);
1613 }
1614
1615 /*
1616  * Get an Accept-Language header which indicates user's preferred languages.
1617  *
1618  * Examples:
1619  *   LANGUAGE= -> ""
1620  *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1621  *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1622  *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1623  *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1624  *   LANGUAGE= LANG=C -> ""
1625  */
1626 static const char *get_accept_language(void)
1627 {
1628         if (!cached_accept_language) {
1629                 struct strbuf buf = STRBUF_INIT;
1630                 write_accept_language(&buf);
1631                 if (buf.len > 0)
1632                         cached_accept_language = strbuf_detach(&buf, NULL);
1633         }
1634
1635         return cached_accept_language;
1636 }
1637
1638 static void http_opt_request_remainder(CURL *curl, off_t pos)
1639 {
1640         char buf[128];
1641         xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1642         curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1643 }
1644
1645 /* http_request() targets */
1646 #define HTTP_REQUEST_STRBUF     0
1647 #define HTTP_REQUEST_FILE       1
1648
1649 static int http_request(const char *url,
1650                         void *result, int target,
1651                         const struct http_get_options *options)
1652 {
1653         struct active_request_slot *slot;
1654         struct slot_results results;
1655         struct curl_slist *headers = http_copy_default_headers();
1656         struct strbuf buf = STRBUF_INIT;
1657         const char *accept_language;
1658         int ret;
1659
1660         slot = get_active_slot();
1661         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1662
1663         if (result == NULL) {
1664                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1665         } else {
1666                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1667                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1668
1669                 if (target == HTTP_REQUEST_FILE) {
1670                         off_t posn = ftello(result);
1671                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1672                                          fwrite);
1673                         if (posn > 0)
1674                                 http_opt_request_remainder(slot->curl, posn);
1675                 } else
1676                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1677                                          fwrite_buffer);
1678         }
1679
1680         accept_language = get_accept_language();
1681
1682         if (accept_language)
1683                 headers = curl_slist_append(headers, accept_language);
1684
1685         strbuf_addstr(&buf, "Pragma:");
1686         if (options && options->no_cache)
1687                 strbuf_addstr(&buf, " no-cache");
1688         if (options && options->keep_error)
1689                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1690         if (options && options->initial_request &&
1691             http_follow_config == HTTP_FOLLOW_INITIAL)
1692                 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1693
1694         headers = curl_slist_append(headers, buf.buf);
1695
1696         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1697         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1698         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1699
1700         ret = run_one_slot(slot, &results);
1701
1702         if (options && options->content_type) {
1703                 struct strbuf raw = STRBUF_INIT;
1704                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1705                 extract_content_type(&raw, options->content_type,
1706                                      options->charset);
1707                 strbuf_release(&raw);
1708         }
1709
1710         if (options && options->effective_url)
1711                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1712                                 options->effective_url);
1713
1714         curl_slist_free_all(headers);
1715         strbuf_release(&buf);
1716
1717         return ret;
1718 }
1719
1720 /*
1721  * Update the "base" url to a more appropriate value, as deduced by
1722  * redirects seen when requesting a URL starting with "url".
1723  *
1724  * The "asked" parameter is a URL that we asked curl to access, and must begin
1725  * with "base".
1726  *
1727  * The "got" parameter is the URL that curl reported to us as where we ended
1728  * up.
1729  *
1730  * Returns 1 if we updated the base url, 0 otherwise.
1731  *
1732  * Our basic strategy is to compare "base" and "asked" to find the bits
1733  * specific to our request. We then strip those bits off of "got" to yield the
1734  * new base. So for example, if our base is "http://example.com/foo.git",
1735  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1736  * with "https://other.example.com/foo.git/info/refs". We would want the
1737  * new URL to become "https://other.example.com/foo.git".
1738  *
1739  * Note that this assumes a sane redirect scheme. It's entirely possible
1740  * in the example above to end up at a URL that does not even end in
1741  * "info/refs".  In such a case we die. There's not much we can do, such a
1742  * scheme is unlikely to represent a real git repository, and failing to
1743  * rewrite the base opens options for malicious redirects to do funny things.
1744  */
1745 static int update_url_from_redirect(struct strbuf *base,
1746                                     const char *asked,
1747                                     const struct strbuf *got)
1748 {
1749         const char *tail;
1750         size_t new_len;
1751
1752         if (!strcmp(asked, got->buf))
1753                 return 0;
1754
1755         if (!skip_prefix(asked, base->buf, &tail))
1756                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1757                     asked, base->buf);
1758
1759         new_len = got->len;
1760         if (!strip_suffix_mem(got->buf, &new_len, tail))
1761                 die(_("unable to update url base from redirection:\n"
1762                       "  asked for: %s\n"
1763                       "   redirect: %s"),
1764                     asked, got->buf);
1765
1766         strbuf_reset(base);
1767         strbuf_add(base, got->buf, new_len);
1768
1769         return 1;
1770 }
1771
1772 static int http_request_reauth(const char *url,
1773                                void *result, int target,
1774                                struct http_get_options *options)
1775 {
1776         int ret = http_request(url, result, target, options);
1777
1778         if (ret != HTTP_OK && ret != HTTP_REAUTH)
1779                 return ret;
1780
1781         if (options && options->effective_url && options->base_url) {
1782                 if (update_url_from_redirect(options->base_url,
1783                                              url, options->effective_url)) {
1784                         credential_from_url(&http_auth, options->base_url->buf);
1785                         url = options->effective_url->buf;
1786                 }
1787         }
1788
1789         if (ret != HTTP_REAUTH)
1790                 return ret;
1791
1792         /*
1793          * If we are using KEEP_ERROR, the previous request may have
1794          * put cruft into our output stream; we should clear it out before
1795          * making our next request. We only know how to do this for
1796          * the strbuf case, but that is enough to satisfy current callers.
1797          */
1798         if (options && options->keep_error) {
1799                 switch (target) {
1800                 case HTTP_REQUEST_STRBUF:
1801                         strbuf_reset(result);
1802                         break;
1803                 default:
1804                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1805                 }
1806         }
1807
1808         credential_fill(&http_auth);
1809
1810         return http_request(url, result, target, options);
1811 }
1812
1813 int http_get_strbuf(const char *url,
1814                     struct strbuf *result,
1815                     struct http_get_options *options)
1816 {
1817         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1818 }
1819
1820 /*
1821  * Downloads a URL and stores the result in the given file.
1822  *
1823  * If a previous interrupted download is detected (i.e. a previous temporary
1824  * file is still around) the download is resumed.
1825  */
1826 static int http_get_file(const char *url, const char *filename,
1827                          struct http_get_options *options)
1828 {
1829         int ret;
1830         struct strbuf tmpfile = STRBUF_INIT;
1831         FILE *result;
1832
1833         strbuf_addf(&tmpfile, "%s.temp", filename);
1834         result = fopen(tmpfile.buf, "a");
1835         if (!result) {
1836                 error("Unable to open local file %s", tmpfile.buf);
1837                 ret = HTTP_ERROR;
1838                 goto cleanup;
1839         }
1840
1841         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1842         fclose(result);
1843
1844         if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1845                 ret = HTTP_ERROR;
1846 cleanup:
1847         strbuf_release(&tmpfile);
1848         return ret;
1849 }
1850
1851 int http_fetch_ref(const char *base, struct ref *ref)
1852 {
1853         struct http_get_options options = {0};
1854         char *url;
1855         struct strbuf buffer = STRBUF_INIT;
1856         int ret = -1;
1857
1858         options.no_cache = 1;
1859
1860         url = quote_ref_url(base, ref->name);
1861         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1862                 strbuf_rtrim(&buffer);
1863                 if (buffer.len == 40)
1864                         ret = get_oid_hex(buffer.buf, &ref->old_oid);
1865                 else if (starts_with(buffer.buf, "ref: ")) {
1866                         ref->symref = xstrdup(buffer.buf + 5);
1867                         ret = 0;
1868                 }
1869         }
1870
1871         strbuf_release(&buffer);
1872         free(url);
1873         return ret;
1874 }
1875
1876 /* Helpers for fetching packs */
1877 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1878 {
1879         char *url, *tmp;
1880         struct strbuf buf = STRBUF_INIT;
1881
1882         if (http_is_verbose)
1883                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1884
1885         end_url_with_slash(&buf, base_url);
1886         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1887         url = strbuf_detach(&buf, NULL);
1888
1889         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1890         tmp = strbuf_detach(&buf, NULL);
1891
1892         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1893                 error("Unable to get pack index %s", url);
1894                 free(tmp);
1895                 tmp = NULL;
1896         }
1897
1898         free(url);
1899         return tmp;
1900 }
1901
1902 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1903         unsigned char *sha1, const char *base_url)
1904 {
1905         struct packed_git *new_pack;
1906         char *tmp_idx = NULL;
1907         int ret;
1908
1909         if (has_pack_index(sha1)) {
1910                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1911                 if (!new_pack)
1912                         return -1; /* parse_pack_index() already issued error message */
1913                 goto add_pack;
1914         }
1915
1916         tmp_idx = fetch_pack_index(sha1, base_url);
1917         if (!tmp_idx)
1918                 return -1;
1919
1920         new_pack = parse_pack_index(sha1, tmp_idx);
1921         if (!new_pack) {
1922                 unlink(tmp_idx);
1923                 free(tmp_idx);
1924
1925                 return -1; /* parse_pack_index() already issued error message */
1926         }
1927
1928         ret = verify_pack_index(new_pack);
1929         if (!ret) {
1930                 close_pack_index(new_pack);
1931                 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1932         }
1933         free(tmp_idx);
1934         if (ret)
1935                 return -1;
1936
1937 add_pack:
1938         new_pack->next = *packs_head;
1939         *packs_head = new_pack;
1940         return 0;
1941 }
1942
1943 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1944 {
1945         struct http_get_options options = {0};
1946         int ret = 0, i = 0;
1947         char *url, *data;
1948         struct strbuf buf = STRBUF_INIT;
1949         unsigned char sha1[20];
1950
1951         end_url_with_slash(&buf, base_url);
1952         strbuf_addstr(&buf, "objects/info/packs");
1953         url = strbuf_detach(&buf, NULL);
1954
1955         options.no_cache = 1;
1956         ret = http_get_strbuf(url, &buf, &options);
1957         if (ret != HTTP_OK)
1958                 goto cleanup;
1959
1960         data = buf.buf;
1961         while (i < buf.len) {
1962                 switch (data[i]) {
1963                 case 'P':
1964                         i++;
1965                         if (i + 52 <= buf.len &&
1966                             starts_with(data + i, " pack-") &&
1967                             starts_with(data + i + 46, ".pack\n")) {
1968                                 get_sha1_hex(data + i + 6, sha1);
1969                                 fetch_and_setup_pack_index(packs_head, sha1,
1970                                                       base_url);
1971                                 i += 51;
1972                                 break;
1973                         }
1974                 default:
1975                         while (i < buf.len && data[i] != '\n')
1976                                 i++;
1977                 }
1978                 i++;
1979         }
1980
1981 cleanup:
1982         free(url);
1983         return ret;
1984 }
1985
1986 void release_http_pack_request(struct http_pack_request *preq)
1987 {
1988         if (preq->packfile != NULL) {
1989                 fclose(preq->packfile);
1990                 preq->packfile = NULL;
1991         }
1992         preq->slot = NULL;
1993         free(preq->url);
1994         free(preq);
1995 }
1996
1997 int finish_http_pack_request(struct http_pack_request *preq)
1998 {
1999         struct packed_git **lst;
2000         struct packed_git *p = preq->target;
2001         char *tmp_idx;
2002         size_t len;
2003         struct child_process ip = CHILD_PROCESS_INIT;
2004         const char *ip_argv[8];
2005
2006         close_pack_index(p);
2007
2008         fclose(preq->packfile);
2009         preq->packfile = NULL;
2010
2011         lst = preq->lst;
2012         while (*lst != p)
2013                 lst = &((*lst)->next);
2014         *lst = (*lst)->next;
2015
2016         if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2017                 die("BUG: pack tmpfile does not end in .pack.temp?");
2018         tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2019
2020         ip_argv[0] = "index-pack";
2021         ip_argv[1] = "-o";
2022         ip_argv[2] = tmp_idx;
2023         ip_argv[3] = preq->tmpfile;
2024         ip_argv[4] = NULL;
2025
2026         ip.argv = ip_argv;
2027         ip.git_cmd = 1;
2028         ip.no_stdin = 1;
2029         ip.no_stdout = 1;
2030
2031         if (run_command(&ip)) {
2032                 unlink(preq->tmpfile);
2033                 unlink(tmp_idx);
2034                 free(tmp_idx);
2035                 return -1;
2036         }
2037
2038         unlink(sha1_pack_index_name(p->sha1));
2039
2040         if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2041          || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2042                 free(tmp_idx);
2043                 return -1;
2044         }
2045
2046         install_packed_git(p);
2047         free(tmp_idx);
2048         return 0;
2049 }
2050
2051 struct http_pack_request *new_http_pack_request(
2052         struct packed_git *target, const char *base_url)
2053 {
2054         off_t prev_posn = 0;
2055         struct strbuf buf = STRBUF_INIT;
2056         struct http_pack_request *preq;
2057
2058         preq = xcalloc(1, sizeof(*preq));
2059         preq->target = target;
2060
2061         end_url_with_slash(&buf, base_url);
2062         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2063                 sha1_to_hex(target->sha1));
2064         preq->url = strbuf_detach(&buf, NULL);
2065
2066         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2067                 sha1_pack_name(target->sha1));
2068         preq->packfile = fopen(preq->tmpfile, "a");
2069         if (!preq->packfile) {
2070                 error("Unable to open local file %s for pack",
2071                       preq->tmpfile);
2072                 goto abort;
2073         }
2074
2075         preq->slot = get_active_slot();
2076         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2077         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2078         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2079         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2080                 no_pragma_header);
2081
2082         /*
2083          * If there is data present from a previous transfer attempt,
2084          * resume where it left off
2085          */
2086         prev_posn = ftello(preq->packfile);
2087         if (prev_posn>0) {
2088                 if (http_is_verbose)
2089                         fprintf(stderr,
2090                                 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2091                                 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2092                 http_opt_request_remainder(preq->slot->curl, prev_posn);
2093         }
2094
2095         return preq;
2096
2097 abort:
2098         free(preq->url);
2099         free(preq);
2100         return NULL;
2101 }
2102
2103 /* Helpers for fetching objects (loose) */
2104 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2105                                void *data)
2106 {
2107         unsigned char expn[4096];
2108         size_t size = eltsize * nmemb;
2109         int posn = 0;
2110         struct http_object_request *freq = data;
2111         struct active_request_slot *slot = freq->slot;
2112
2113         if (slot) {
2114                 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2115                                                 &slot->http_code);
2116                 if (c != CURLE_OK)
2117                         die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2118                                 curl_easy_strerror(c));
2119                 if (slot->http_code >= 300)
2120                         return size;
2121         }
2122
2123         do {
2124                 ssize_t retval = xwrite(freq->localfile,
2125                                         (char *) ptr + posn, size - posn);
2126                 if (retval < 0)
2127                         return posn;
2128                 posn += retval;
2129         } while (posn < size);
2130
2131         freq->stream.avail_in = size;
2132         freq->stream.next_in = (void *)ptr;
2133         do {
2134                 freq->stream.next_out = expn;
2135                 freq->stream.avail_out = sizeof(expn);
2136                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2137                 git_SHA1_Update(&freq->c, expn,
2138                                 sizeof(expn) - freq->stream.avail_out);
2139         } while (freq->stream.avail_in && freq->zret == Z_OK);
2140         return size;
2141 }
2142
2143 struct http_object_request *new_http_object_request(const char *base_url,
2144         unsigned char *sha1)
2145 {
2146         char *hex = sha1_to_hex(sha1);
2147         const char *filename;
2148         char prevfile[PATH_MAX];
2149         int prevlocal;
2150         char prev_buf[PREV_BUF_SIZE];
2151         ssize_t prev_read = 0;
2152         off_t prev_posn = 0;
2153         struct http_object_request *freq;
2154
2155         freq = xcalloc(1, sizeof(*freq));
2156         hashcpy(freq->sha1, sha1);
2157         freq->localfile = -1;
2158
2159         filename = sha1_file_name(sha1);
2160         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2161                  "%s.temp", filename);
2162
2163         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2164         unlink_or_warn(prevfile);
2165         rename(freq->tmpfile, prevfile);
2166         unlink_or_warn(freq->tmpfile);
2167
2168         if (freq->localfile != -1)
2169                 error("fd leakage in start: %d", freq->localfile);
2170         freq->localfile = open(freq->tmpfile,
2171                                O_WRONLY | O_CREAT | O_EXCL, 0666);
2172         /*
2173          * This could have failed due to the "lazy directory creation";
2174          * try to mkdir the last path component.
2175          */
2176         if (freq->localfile < 0 && errno == ENOENT) {
2177                 char *dir = strrchr(freq->tmpfile, '/');
2178                 if (dir) {
2179                         *dir = 0;
2180                         mkdir(freq->tmpfile, 0777);
2181                         *dir = '/';
2182                 }
2183                 freq->localfile = open(freq->tmpfile,
2184                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
2185         }
2186
2187         if (freq->localfile < 0) {
2188                 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2189                 goto abort;
2190         }
2191
2192         git_inflate_init(&freq->stream);
2193
2194         git_SHA1_Init(&freq->c);
2195
2196         freq->url = get_remote_object_url(base_url, hex, 0);
2197
2198         /*
2199          * If a previous temp file is present, process what was already
2200          * fetched.
2201          */
2202         prevlocal = open(prevfile, O_RDONLY);
2203         if (prevlocal != -1) {
2204                 do {
2205                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2206                         if (prev_read>0) {
2207                                 if (fwrite_sha1_file(prev_buf,
2208                                                      1,
2209                                                      prev_read,
2210                                                      freq) == prev_read) {
2211                                         prev_posn += prev_read;
2212                                 } else {
2213                                         prev_read = -1;
2214                                 }
2215                         }
2216                 } while (prev_read > 0);
2217                 close(prevlocal);
2218         }
2219         unlink_or_warn(prevfile);
2220
2221         /*
2222          * Reset inflate/SHA1 if there was an error reading the previous temp
2223          * file; also rewind to the beginning of the local file.
2224          */
2225         if (prev_read == -1) {
2226                 memset(&freq->stream, 0, sizeof(freq->stream));
2227                 git_inflate_init(&freq->stream);
2228                 git_SHA1_Init(&freq->c);
2229                 if (prev_posn>0) {
2230                         prev_posn = 0;
2231                         lseek(freq->localfile, 0, SEEK_SET);
2232                         if (ftruncate(freq->localfile, 0) < 0) {
2233                                 error_errno("Couldn't truncate temporary file %s",
2234                                             freq->tmpfile);
2235                                 goto abort;
2236                         }
2237                 }
2238         }
2239
2240         freq->slot = get_active_slot();
2241
2242         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2243         curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2244         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2245         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2246         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2247         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2248
2249         /*
2250          * If we have successfully processed data from a previous fetch
2251          * attempt, only fetch the data we don't already have.
2252          */
2253         if (prev_posn>0) {
2254                 if (http_is_verbose)
2255                         fprintf(stderr,
2256                                 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2257                                 hex, (uintmax_t)prev_posn);
2258                 http_opt_request_remainder(freq->slot->curl, prev_posn);
2259         }
2260
2261         return freq;
2262
2263 abort:
2264         free(freq->url);
2265         free(freq);
2266         return NULL;
2267 }
2268
2269 void process_http_object_request(struct http_object_request *freq)
2270 {
2271         if (freq->slot == NULL)
2272                 return;
2273         freq->curl_result = freq->slot->curl_result;
2274         freq->http_code = freq->slot->http_code;
2275         freq->slot = NULL;
2276 }
2277
2278 int finish_http_object_request(struct http_object_request *freq)
2279 {
2280         struct stat st;
2281
2282         close(freq->localfile);
2283         freq->localfile = -1;
2284
2285         process_http_object_request(freq);
2286
2287         if (freq->http_code == 416) {
2288                 warning("requested range invalid; we may already have all the data.");
2289         } else if (freq->curl_result != CURLE_OK) {
2290                 if (stat(freq->tmpfile, &st) == 0)
2291                         if (st.st_size == 0)
2292                                 unlink_or_warn(freq->tmpfile);
2293                 return -1;
2294         }
2295
2296         git_inflate_end(&freq->stream);
2297         git_SHA1_Final(freq->real_sha1, &freq->c);
2298         if (freq->zret != Z_STREAM_END) {
2299                 unlink_or_warn(freq->tmpfile);
2300                 return -1;
2301         }
2302         if (hashcmp(freq->sha1, freq->real_sha1)) {
2303                 unlink_or_warn(freq->tmpfile);
2304                 return -1;
2305         }
2306         freq->rename =
2307                 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2308
2309         return freq->rename;
2310 }
2311
2312 void abort_http_object_request(struct http_object_request *freq)
2313 {
2314         unlink_or_warn(freq->tmpfile);
2315
2316         release_http_object_request(freq);
2317 }
2318
2319 void release_http_object_request(struct http_object_request *freq)
2320 {
2321         if (freq->localfile != -1) {
2322                 close(freq->localfile);
2323                 freq->localfile = -1;
2324         }
2325         if (freq->url != NULL) {
2326                 free(freq->url);
2327                 freq->url = NULL;
2328         }
2329         if (freq->slot != NULL) {
2330                 freq->slot->callback_func = NULL;
2331                 freq->slot->callback_data = NULL;
2332                 release_active_slot(freq->slot);
2333                 freq->slot = NULL;
2334         }
2335 }