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
  12 int active_requests;
  13 int http_is_verbose;
  14 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  15
  16 #if LIBCURL_VERSION_NUM >= 0x070a06
  17 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  18 #endif
  19
  20 static int min_curl_sessions = 1;
  21 static int curl_session_count;
  22 #ifdef USE_CURL_MULTI
  23 static int max_requests = -1;
  24 static CURLM *curlm;
  25 #endif
  26 #ifndef NO_CURL_EASY_DUPHANDLE
  27 static CURL *curl_default;
  28 #endif
  29
  30 #define PREV_BUF_SIZE 4096
  31 #define RANGE_HEADER_SIZE 30
  32
  33 char curl_errorstr[CURL_ERROR_SIZE];
  34
  35 static int curl_ssl_verify = -1;
  36 static int curl_ssl_try;
  37 static const char *ssl_cert;
  38 #if LIBCURL_VERSION_NUM >= 0x070903
  39 static const char *ssl_key;
  40 #endif
  41 #if LIBCURL_VERSION_NUM >= 0x070908
  42 static const char *ssl_capath;
  43 #endif
  44 static const char *ssl_cainfo;
  45 static long curl_low_speed_limit = -1;
  46 static long curl_low_speed_time = -1;
  47 static int curl_ftp_no_epsv;
  48 static const char *curl_http_proxy;
  49 static const char *curl_cookie_file;
  50 static int curl_save_cookies;
  51 struct credential http_auth = CREDENTIAL_INIT;
  52 static int http_proactive_auth;
  53 static const char *user_agent;
  54
  55 #if LIBCURL_VERSION_NUM >= 0x071700
  56 /* Use CURLOPT_KEYPASSWD as is */
  57 #elif LIBCURL_VERSION_NUM >= 0x070903
  58 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  59 #else
  60 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  61 #endif
  62
  63 static struct credential cert_auth = CREDENTIAL_INIT;
  64 static int ssl_cert_password_required;
  65 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  66 static unsigned long http_auth_methods = CURLAUTH_ANY;
  67 #endif
  68
  69 static struct curl_slist *pragma_header;
  70 static struct curl_slist *no_pragma_header;
  71
  72 static struct active_request_slot *active_queue_head;
  73
  74 static char *cached_accept_language;
  75
  76 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  77 {
  78         size_t size = eltsize * nmemb;
  79         struct buffer *buffer = buffer_;
  80
  81         if (size > buffer->buf.len - buffer->posn)
  82                 size = buffer->buf.len - buffer->posn;
  83         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  84         buffer->posn += size;
  85
  86         return size;
  87 }
  88
  89 #ifndef NO_CURL_IOCTL
  90 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  91 {
  92         struct buffer *buffer = clientp;
  93
  94         switch (cmd) {
  95         case CURLIOCMD_NOP:
  96                 return CURLIOE_OK;
  97
  98         case CURLIOCMD_RESTARTREAD:
  99                 buffer->posn = 0;
 100                 return CURLIOE_OK;
 101
 102         default:
 103                 return CURLIOE_UNKNOWNCMD;
 104         }
 105 }
 106 #endif
 107
 108 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 109 {
 110         size_t size = eltsize * nmemb;
 111         struct strbuf *buffer = buffer_;
 112
 113         strbuf_add(buffer, ptr, size);
 114         return size;
 115 }
 116
 117 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 118 {
 119         return eltsize * nmemb;
 120 }
 121
 122 static void closedown_active_slot(struct active_request_slot *slot)
 123 {
 124         active_requests--;
 125         slot->in_use = 0;
 126 }
 127
 128 static void finish_active_slot(struct active_request_slot *slot)
 129 {
 130         closedown_active_slot(slot);
 131         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 132
 133         if (slot->finished != NULL)
 134                 (*slot->finished) = 1;
 135
 136         /* Store slot results so they can be read after the slot is reused */
 137         if (slot->results != NULL) {
 138                 slot->results->curl_result = slot->curl_result;
 139                 slot->results->http_code = slot->http_code;
 140 #if LIBCURL_VERSION_NUM >= 0x070a08
 141                 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 142                                   &slot->results->auth_avail);
 143 #else
 144                 slot->results->auth_avail = 0;
 145 #endif
 146         }
 147
 148         /* Run callback if appropriate */
 149         if (slot->callback_func != NULL)
 150                 slot->callback_func(slot->callback_data);
 151 }
 152
 153 #ifdef USE_CURL_MULTI
 154 static void process_curl_messages(void)
 155 {
 156         int num_messages;
 157         struct active_request_slot *slot;
 158         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 159
 160         while (curl_message != NULL) {
 161                 if (curl_message->msg == CURLMSG_DONE) {
 162                         int curl_result = curl_message->data.result;
 163                         slot = active_queue_head;
 164                         while (slot != NULL &&
 165                                slot->curl != curl_message->easy_handle)
 166                                 slot = slot->next;
 167                         if (slot != NULL) {
 168                                 curl_multi_remove_handle(curlm, slot->curl);
 169                                 slot->curl_result = curl_result;
 170                                 finish_active_slot(slot);
 171                         } else {
 172                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 173                         }
 174                 } else {
 175                         fprintf(stderr, "Unknown CURL message received: %d\n",
 176                                 (int)curl_message->msg);
 177                 }
 178                 curl_message = curl_multi_info_read(curlm, &num_messages);
 179         }
 180 }
 181 #endif
 182
 183 static int http_options(const char *var, const char *value, void *cb)
 184 {
 185         if (!strcmp("http.sslverify", var)) {
 186                 curl_ssl_verify = git_config_bool(var, value);
 187                 return 0;
 188         }
 189         if (!strcmp("http.sslcert", var))
 190                 return git_config_string(&ssl_cert, var, value);
 191 #if LIBCURL_VERSION_NUM >= 0x070903
 192         if (!strcmp("http.sslkey", var))
 193                 return git_config_string(&ssl_key, var, value);
 194 #endif
 195 #if LIBCURL_VERSION_NUM >= 0x070908
 196         if (!strcmp("http.sslcapath", var))
 197                 return git_config_string(&ssl_capath, var, value);
 198 #endif
 199         if (!strcmp("http.sslcainfo", var))
 200                 return git_config_string(&ssl_cainfo, var, value);
 201         if (!strcmp("http.sslcertpasswordprotected", var)) {
 202                 ssl_cert_password_required = git_config_bool(var, value);
 203                 return 0;
 204         }
 205         if (!strcmp("http.ssltry", var)) {
 206                 curl_ssl_try = git_config_bool(var, value);
 207                 return 0;
 208         }
 209         if (!strcmp("http.minsessions", var)) {
 210                 min_curl_sessions = git_config_int(var, value);
 211 #ifndef USE_CURL_MULTI
 212                 if (min_curl_sessions > 1)
 213                         min_curl_sessions = 1;
 214 #endif
 215                 return 0;
 216         }
 217 #ifdef USE_CURL_MULTI
 218         if (!strcmp("http.maxrequests", var)) {
 219                 max_requests = git_config_int(var, value);
 220                 return 0;
 221         }
 222 #endif
 223         if (!strcmp("http.lowspeedlimit", var)) {
 224                 curl_low_speed_limit = (long)git_config_int(var, value);
 225                 return 0;
 226         }
 227         if (!strcmp("http.lowspeedtime", var)) {
 228                 curl_low_speed_time = (long)git_config_int(var, value);
 229                 return 0;
 230         }
 231
 232         if (!strcmp("http.noepsv", var)) {
 233                 curl_ftp_no_epsv = git_config_bool(var, value);
 234                 return 0;
 235         }
 236         if (!strcmp("http.proxy", var))
 237                 return git_config_string(&curl_http_proxy, var, value);
 238
 239         if (!strcmp("http.cookiefile", var))
 240                 return git_config_string(&curl_cookie_file, var, value);
 241         if (!strcmp("http.savecookies", var)) {
 242                 curl_save_cookies = git_config_bool(var, value);
 243                 return 0;
 244         }
 245
 246         if (!strcmp("http.postbuffer", var)) {
 247                 http_post_buffer = git_config_int(var, value);
 248                 if (http_post_buffer < LARGE_PACKET_MAX)
 249                         http_post_buffer = LARGE_PACKET_MAX;
 250                 return 0;
 251         }
 252
 253         if (!strcmp("http.useragent", var))
 254                 return git_config_string(&user_agent, var, value);
 255
 256         /* Fall back on the default ones */
 257         return git_default_config(var, value, cb);
 258 }
 259
 260 static void init_curl_http_auth(CURL *result)
 261 {
 262         if (!http_auth.username)
 263                 return;
 264
 265         credential_fill(&http_auth);
 266
 267 #if LIBCURL_VERSION_NUM >= 0x071301
 268         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 269         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 270 #else
 271         {
 272                 static struct strbuf up = STRBUF_INIT;
 273                 /*
 274                  * Note that we assume we only ever have a single set of
 275                  * credentials in a given program run, so we do not have
 276                  * to worry about updating this buffer, only setting its
 277                  * initial value.
 278                  */
 279                 if (!up.len)
 280                         strbuf_addf(&up, "%s:%s",
 281                                 http_auth.username, http_auth.password);
 282                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 283         }
 284 #endif
 285 }
 286
 287 static int has_cert_password(void)
 288 {
 289         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 290                 return 0;
 291         if (!cert_auth.password) {
 292                 cert_auth.protocol = xstrdup("cert");
 293                 cert_auth.username = xstrdup("");
 294                 cert_auth.path = xstrdup(ssl_cert);
 295                 credential_fill(&cert_auth);
 296         }
 297         return 1;
 298 }
 299
 300 #if LIBCURL_VERSION_NUM >= 0x071900
 301 static void set_curl_keepalive(CURL *c)
 302 {
 303         curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 304 }
 305
 306 #elif LIBCURL_VERSION_NUM >= 0x071000
 307 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 308 {
 309         int ka = 1;
 310         int rc;
 311         socklen_t len = (socklen_t)sizeof(ka);
 312
 313         if (type != CURLSOCKTYPE_IPCXN)
 314                 return 0;
 315
 316         rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 317         if (rc < 0)
 318                 warning("unable to set SO_KEEPALIVE on socket %s",
 319                         strerror(errno));
 320
 321         return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 322 }
 323
 324 static void set_curl_keepalive(CURL *c)
 325 {
 326         curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 327 }
 328
 329 #else
 330 static void set_curl_keepalive(CURL *c)
 331 {
 332         /* not supported on older curl versions */
 333 }
 334 #endif
 335
 336 static CURL *get_curl_handle(void)
 337 {
 338         CURL *result = curl_easy_init();
 339
 340         if (!result)
 341                 die("curl_easy_init failed");
 342
 343         if (!curl_ssl_verify) {
 344                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 345                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 346         } else {
 347                 /* Verify authenticity of the peer's certificate */
 348                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 349                 /* The name in the cert must match whom we tried to connect */
 350                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 351         }
 352
 353 #if LIBCURL_VERSION_NUM >= 0x070907
 354         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 355 #endif
 356 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 357         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 358 #endif
 359
 360         if (http_proactive_auth)
 361                 init_curl_http_auth(result);
 362
 363         if (ssl_cert != NULL)
 364                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 365         if (has_cert_password())
 366                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 367 #if LIBCURL_VERSION_NUM >= 0x070903
 368         if (ssl_key != NULL)
 369                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 370 #endif
 371 #if LIBCURL_VERSION_NUM >= 0x070908
 372         if (ssl_capath != NULL)
 373                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 374 #endif
 375         if (ssl_cainfo != NULL)
 376                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 377
 378         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 379                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 380                                  curl_low_speed_limit);
 381                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 382                                  curl_low_speed_time);
 383         }
 384
 385         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 386 #if LIBCURL_VERSION_NUM >= 0x071301
 387         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 388 #elif LIBCURL_VERSION_NUM >= 0x071101
 389         curl_easy_setopt(result, CURLOPT_POST301, 1);
 390 #endif
 391
 392         if (getenv("GIT_CURL_VERBOSE"))
 393                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 394
 395         curl_easy_setopt(result, CURLOPT_USERAGENT,
 396                 user_agent ? user_agent : git_user_agent());
 397
 398         if (curl_ftp_no_epsv)
 399                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 400
 401 #ifdef CURLOPT_USE_SSL
 402         if (curl_ssl_try)
 403                 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 404 #endif
 405
 406         if (curl_http_proxy) {
 407                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 408 #if LIBCURL_VERSION_NUM >= 0x070a07
 409                 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 410 #endif
 411         }
 412
 413         set_curl_keepalive(result);
 414
 415         return result;
 416 }
 417
 418 static void set_from_env(const char **var, const char *envname)
 419 {
 420         const char *val = getenv(envname);
 421         if (val)
 422                 *var = val;
 423 }
 424
 425 void http_init(struct remote *remote, const char *url, int proactive_auth)
 426 {
 427         char *low_speed_limit;
 428         char *low_speed_time;
 429         char *normalized_url;
 430         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 431
 432         config.section = "http";
 433         config.key = NULL;
 434         config.collect_fn = http_options;
 435         config.cascade_fn = git_default_config;
 436         config.cb = NULL;
 437
 438         http_is_verbose = 0;
 439         normalized_url = url_normalize(url, &config.url);
 440
 441         git_config(urlmatch_config_entry, &config);
 442         free(normalized_url);
 443
 444         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 445                 die("curl_global_init failed");
 446
 447         http_proactive_auth = proactive_auth;
 448
 449         if (remote && remote->http_proxy)
 450                 curl_http_proxy = xstrdup(remote->http_proxy);
 451
 452         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 453         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 454
 455 #ifdef USE_CURL_MULTI
 456         {
 457                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 458                 if (http_max_requests != NULL)
 459                         max_requests = atoi(http_max_requests);
 460         }
 461
 462         curlm = curl_multi_init();
 463         if (!curlm)
 464                 die("curl_multi_init failed");
 465 #endif
 466
 467         if (getenv("GIT_SSL_NO_VERIFY"))
 468                 curl_ssl_verify = 0;
 469
 470         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 471 #if LIBCURL_VERSION_NUM >= 0x070903
 472         set_from_env(&ssl_key, "GIT_SSL_KEY");
 473 #endif
 474 #if LIBCURL_VERSION_NUM >= 0x070908
 475         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 476 #endif
 477         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 478
 479         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 480
 481         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 482         if (low_speed_limit != NULL)
 483                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 484         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 485         if (low_speed_time != NULL)
 486                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 487
 488         if (curl_ssl_verify == -1)
 489                 curl_ssl_verify = 1;
 490
 491         curl_session_count = 0;
 492 #ifdef USE_CURL_MULTI
 493         if (max_requests < 1)
 494                 max_requests = DEFAULT_MAX_REQUESTS;
 495 #endif
 496
 497         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 498                 curl_ftp_no_epsv = 1;
 499
 500         if (url) {
 501                 credential_from_url(&http_auth, url);
 502                 if (!ssl_cert_password_required &&
 503                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 504                     starts_with(url, "https://"))
 505                         ssl_cert_password_required = 1;
 506         }
 507
 508 #ifndef NO_CURL_EASY_DUPHANDLE
 509         curl_default = get_curl_handle();
 510 #endif
 511 }
 512
 513 void http_cleanup(void)
 514 {
 515         struct active_request_slot *slot = active_queue_head;
 516
 517         while (slot != NULL) {
 518                 struct active_request_slot *next = slot->next;
 519                 if (slot->curl != NULL) {
 520 #ifdef USE_CURL_MULTI
 521                         curl_multi_remove_handle(curlm, slot->curl);
 522 #endif
 523                         curl_easy_cleanup(slot->curl);
 524                 }
 525                 free(slot);
 526                 slot = next;
 527         }
 528         active_queue_head = NULL;
 529
 530 #ifndef NO_CURL_EASY_DUPHANDLE
 531         curl_easy_cleanup(curl_default);
 532 #endif
 533
 534 #ifdef USE_CURL_MULTI
 535         curl_multi_cleanup(curlm);
 536 #endif
 537         curl_global_cleanup();
 538
 539         curl_slist_free_all(pragma_header);
 540         pragma_header = NULL;
 541
 542         curl_slist_free_all(no_pragma_header);
 543         no_pragma_header = NULL;
 544
 545         if (curl_http_proxy) {
 546                 free((void *)curl_http_proxy);
 547                 curl_http_proxy = NULL;
 548         }
 549
 550         if (cert_auth.password != NULL) {
 551                 memset(cert_auth.password, 0, strlen(cert_auth.password));
 552                 free(cert_auth.password);
 553                 cert_auth.password = NULL;
 554         }
 555         ssl_cert_password_required = 0;
 556
 557         free(cached_accept_language);
 558         cached_accept_language = NULL;
 559 }
 560
 561 struct active_request_slot *get_active_slot(void)
 562 {
 563         struct active_request_slot *slot = active_queue_head;
 564         struct active_request_slot *newslot;
 565
 566 #ifdef USE_CURL_MULTI
 567         int num_transfers;
 568
 569         /* Wait for a slot to open up if the queue is full */
 570         while (active_requests >= max_requests) {
 571                 curl_multi_perform(curlm, &num_transfers);
 572                 if (num_transfers < active_requests)
 573                         process_curl_messages();
 574         }
 575 #endif
 576
 577         while (slot != NULL && slot->in_use)
 578                 slot = slot->next;
 579
 580         if (slot == NULL) {
 581                 newslot = xmalloc(sizeof(*newslot));
 582                 newslot->curl = NULL;
 583                 newslot->in_use = 0;
 584                 newslot->next = NULL;
 585
 586                 slot = active_queue_head;
 587                 if (slot == NULL) {
 588                         active_queue_head = newslot;
 589                 } else {
 590                         while (slot->next != NULL)
 591                                 slot = slot->next;
 592                         slot->next = newslot;
 593                 }
 594                 slot = newslot;
 595         }
 596
 597         if (slot->curl == NULL) {
 598 #ifdef NO_CURL_EASY_DUPHANDLE
 599                 slot->curl = get_curl_handle();
 600 #else
 601                 slot->curl = curl_easy_duphandle(curl_default);
 602 #endif
 603                 curl_session_count++;
 604         }
 605
 606         active_requests++;
 607         slot->in_use = 1;
 608         slot->results = NULL;
 609         slot->finished = NULL;
 610         slot->callback_data = NULL;
 611         slot->callback_func = NULL;
 612         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 613         if (curl_save_cookies)
 614                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 615         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 616         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 617         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 618         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 619         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 620         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 621         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 622         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 623         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 624 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 625         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 626 #endif
 627         if (http_auth.password)
 628                 init_curl_http_auth(slot->curl);
 629
 630         return slot;
 631 }
 632
 633 int start_active_slot(struct active_request_slot *slot)
 634 {
 635 #ifdef USE_CURL_MULTI
 636         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 637         int num_transfers;
 638
 639         if (curlm_result != CURLM_OK &&
 640             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 641                 active_requests--;
 642                 slot->in_use = 0;
 643                 return 0;
 644         }
 645
 646         /*
 647          * We know there must be something to do, since we just added
 648          * something.
 649          */
 650         curl_multi_perform(curlm, &num_transfers);
 651 #endif
 652         return 1;
 653 }
 654
 655 #ifdef USE_CURL_MULTI
 656 struct fill_chain {
 657         void *data;
 658         int (*fill)(void *);
 659         struct fill_chain *next;
 660 };
 661
 662 static struct fill_chain *fill_cfg;
 663
 664 void add_fill_function(void *data, int (*fill)(void *))
 665 {
 666         struct fill_chain *new = xmalloc(sizeof(*new));
 667         struct fill_chain **linkp = &fill_cfg;
 668         new->data = data;
 669         new->fill = fill;
 670         new->next = NULL;
 671         while (*linkp)
 672                 linkp = &(*linkp)->next;
 673         *linkp = new;
 674 }
 675
 676 void fill_active_slots(void)
 677 {
 678         struct active_request_slot *slot = active_queue_head;
 679
 680         while (active_requests < max_requests) {
 681                 struct fill_chain *fill;
 682                 for (fill = fill_cfg; fill; fill = fill->next)
 683                         if (fill->fill(fill->data))
 684                                 break;
 685
 686                 if (!fill)
 687                         break;
 688         }
 689
 690         while (slot != NULL) {
 691                 if (!slot->in_use && slot->curl != NULL
 692                         && curl_session_count > min_curl_sessions) {
 693                         curl_easy_cleanup(slot->curl);
 694                         slot->curl = NULL;
 695                         curl_session_count--;
 696                 }
 697                 slot = slot->next;
 698         }
 699 }
 700
 701 void step_active_slots(void)
 702 {
 703         int num_transfers;
 704         CURLMcode curlm_result;
 705
 706         do {
 707                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 708         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 709         if (num_transfers < active_requests) {
 710                 process_curl_messages();
 711                 fill_active_slots();
 712         }
 713 }
 714 #endif
 715
 716 void run_active_slot(struct active_request_slot *slot)
 717 {
 718 #ifdef USE_CURL_MULTI
 719         fd_set readfds;
 720         fd_set writefds;
 721         fd_set excfds;
 722         int max_fd;
 723         struct timeval select_timeout;
 724         int finished = 0;
 725
 726         slot->finished = &finished;
 727         while (!finished) {
 728                 step_active_slots();
 729
 730                 if (slot->in_use) {
 731 #if LIBCURL_VERSION_NUM >= 0x070f04
 732                         long curl_timeout;
 733                         curl_multi_timeout(curlm, &curl_timeout);
 734                         if (curl_timeout == 0) {
 735                                 continue;
 736                         } else if (curl_timeout == -1) {
 737                                 select_timeout.tv_sec  = 0;
 738                                 select_timeout.tv_usec = 50000;
 739                         } else {
 740                                 select_timeout.tv_sec  =  curl_timeout / 1000;
 741                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 742                         }
 743 #else
 744                         select_timeout.tv_sec  = 0;
 745                         select_timeout.tv_usec = 50000;
 746 #endif
 747
 748                         max_fd = -1;
 749                         FD_ZERO(&readfds);
 750                         FD_ZERO(&writefds);
 751                         FD_ZERO(&excfds);
 752                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 753
 754                         /*
 755                          * It can happen that curl_multi_timeout returns a pathologically
 756                          * long timeout when curl_multi_fdset returns no file descriptors
 757                          * to read.  See commit message for more details.
 758                          */
 759                         if (max_fd < 0 &&
 760                             (select_timeout.tv_sec > 0 ||
 761                              select_timeout.tv_usec > 50000)) {
 762                                 select_timeout.tv_sec  = 0;
 763                                 select_timeout.tv_usec = 50000;
 764                         }
 765
 766                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 767                 }
 768         }
 769 #else
 770         while (slot->in_use) {
 771                 slot->curl_result = curl_easy_perform(slot->curl);
 772                 finish_active_slot(slot);
 773         }
 774 #endif
 775 }
 776
 777 static void release_active_slot(struct active_request_slot *slot)
 778 {
 779         closedown_active_slot(slot);
 780         if (slot->curl && curl_session_count > min_curl_sessions) {
 781 #ifdef USE_CURL_MULTI
 782                 curl_multi_remove_handle(curlm, slot->curl);
 783 #endif
 784                 curl_easy_cleanup(slot->curl);
 785                 slot->curl = NULL;
 786                 curl_session_count--;
 787         }
 788 #ifdef USE_CURL_MULTI
 789         fill_active_slots();
 790 #endif
 791 }
 792
 793 void finish_all_active_slots(void)
 794 {
 795         struct active_request_slot *slot = active_queue_head;
 796
 797         while (slot != NULL)
 798                 if (slot->in_use) {
 799                         run_active_slot(slot);
 800                         slot = active_queue_head;
 801                 } else {
 802                         slot = slot->next;
 803                 }
 804 }
 805
 806 /* Helpers for modifying and creating URLs */
 807 static inline int needs_quote(int ch)
 808 {
 809         if (((ch >= 'A') && (ch <= 'Z'))
 810                         || ((ch >= 'a') && (ch <= 'z'))
 811                         || ((ch >= '0') && (ch <= '9'))
 812                         || (ch == '/')
 813                         || (ch == '-')
 814                         || (ch == '.'))
 815                 return 0;
 816         return 1;
 817 }
 818
 819 static char *quote_ref_url(const char *base, const char *ref)
 820 {
 821         struct strbuf buf = STRBUF_INIT;
 822         const char *cp;
 823         int ch;
 824
 825         end_url_with_slash(&buf, base);
 826
 827         for (cp = ref; (ch = *cp) != 0; cp++)
 828                 if (needs_quote(ch))
 829                         strbuf_addf(&buf, "%%%02x", ch);
 830                 else
 831                         strbuf_addch(&buf, *cp);
 832
 833         return strbuf_detach(&buf, NULL);
 834 }
 835
 836 void append_remote_object_url(struct strbuf *buf, const char *url,
 837                               const char *hex,
 838                               int only_two_digit_prefix)
 839 {
 840         end_url_with_slash(buf, url);
 841
 842         strbuf_addf(buf, "objects/%.*s/", 2, hex);
 843         if (!only_two_digit_prefix)
 844                 strbuf_addf(buf, "%s", hex+2);
 845 }
 846
 847 char *get_remote_object_url(const char *url, const char *hex,
 848                             int only_two_digit_prefix)
 849 {
 850         struct strbuf buf = STRBUF_INIT;
 851         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 852         return strbuf_detach(&buf, NULL);
 853 }
 854
 855 static int handle_curl_result(struct slot_results *results)
 856 {
 857         /*
 858          * If we see a failing http code with CURLE_OK, we have turned off
 859          * FAILONERROR (to keep the server's custom error response), and should
 860          * translate the code into failure here.
 861          */
 862         if (results->curl_result == CURLE_OK &&
 863             results->http_code >= 400) {
 864                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
 865                 /*
 866                  * Normally curl will already have put the "reason phrase"
 867                  * from the server into curl_errorstr; unfortunately without
 868                  * FAILONERROR it is lost, so we can give only the numeric
 869                  * status code.
 870                  */
 871                 snprintf(curl_errorstr, sizeof(curl_errorstr),
 872                          "The requested URL returned error: %ld",
 873                          results->http_code);
 874         }
 875
 876         if (results->curl_result == CURLE_OK) {
 877                 credential_approve(&http_auth);
 878                 return HTTP_OK;
 879         } else if (missing_target(results))
 880                 return HTTP_MISSING_TARGET;
 881         else if (results->http_code == 401) {
 882                 if (http_auth.username && http_auth.password) {
 883                         credential_reject(&http_auth);
 884                         return HTTP_NOAUTH;
 885                 } else {
 886 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 887                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
 888 #endif
 889                         return HTTP_REAUTH;
 890                 }
 891         } else {
 892 #if LIBCURL_VERSION_NUM >= 0x070c00
 893                 if (!curl_errorstr[0])
 894                         strlcpy(curl_errorstr,
 895                                 curl_easy_strerror(results->curl_result),
 896                                 sizeof(curl_errorstr));
 897 #endif
 898                 return HTTP_ERROR;
 899         }
 900 }
 901
 902 int run_one_slot(struct active_request_slot *slot,
 903                  struct slot_results *results)
 904 {
 905         slot->results = results;
 906         if (!start_active_slot(slot)) {
 907                 snprintf(curl_errorstr, sizeof(curl_errorstr),
 908                          "failed to start HTTP request");
 909                 return HTTP_START_FAILED;
 910         }
 911
 912         run_active_slot(slot);
 913         return handle_curl_result(results);
 914 }
 915
 916 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
 917 {
 918         char *ptr;
 919         CURLcode ret;
 920
 921         strbuf_reset(buf);
 922         ret = curl_easy_getinfo(curl, info, &ptr);
 923         if (!ret && ptr)
 924                 strbuf_addstr(buf, ptr);
 925         return ret;
 926 }
 927
 928 /*
 929  * Check for and extract a content-type parameter. "raw"
 930  * should be positioned at the start of the potential
 931  * parameter, with any whitespace already removed.
 932  *
 933  * "name" is the name of the parameter. The value is appended
 934  * to "out".
 935  */
 936 static int extract_param(const char *raw, const char *name,
 937                          struct strbuf *out)
 938 {
 939         size_t len = strlen(name);
 940
 941         if (strncasecmp(raw, name, len))
 942                 return -1;
 943         raw += len;
 944
 945         if (*raw != '=')
 946                 return -1;
 947         raw++;
 948
 949         while (*raw && !isspace(*raw) && *raw != ';')
 950                 strbuf_addch(out, *raw++);
 951         return 0;
 952 }
 953
 954 /*
 955  * Extract a normalized version of the content type, with any
 956  * spaces suppressed, all letters lowercased, and no trailing ";"
 957  * or parameters.
 958  *
 959  * Note that we will silently remove even invalid whitespace. For
 960  * example, "text / plain" is specifically forbidden by RFC 2616,
 961  * but "text/plain" is the only reasonable output, and this keeps
 962  * our code simple.
 963  *
 964  * If the "charset" argument is not NULL, store the value of any
 965  * charset parameter there.
 966  *
 967  * Example:
 968  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
 969  *   "text / plain" -> "text/plain"
 970  */
 971 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
 972                                  struct strbuf *charset)
 973 {
 974         const char *p;
 975
 976         strbuf_reset(type);
 977         strbuf_grow(type, raw->len);
 978         for (p = raw->buf; *p; p++) {
 979                 if (isspace(*p))
 980                         continue;
 981                 if (*p == ';') {
 982                         p++;
 983                         break;
 984                 }
 985                 strbuf_addch(type, tolower(*p));
 986         }
 987
 988         if (!charset)
 989                 return;
 990
 991         strbuf_reset(charset);
 992         while (*p) {
 993                 while (isspace(*p) || *p == ';')
 994                         p++;
 995                 if (!extract_param(p, "charset", charset))
 996                         return;
 997                 while (*p && !isspace(*p))
 998                         p++;
 999         }
1000
1001         if (!charset->len && starts_with(type->buf, "text/"))
1002                 strbuf_addstr(charset, "ISO-8859-1");
1003 }
1004
1005
1006 /*
1007  * Guess the user's preferred languages from the value in LANGUAGE environment
1008  * variable and LC_MESSAGES locale category if NO_GETTEXT is not defined.
1009  *
1010  * The result can be a colon-separated list like "ko:ja:en".
1011  */
1012 static const char *get_preferred_languages(void)
1013 {
1014         const char *retval;
1015
1016         retval = getenv("LANGUAGE");
1017         if (retval && *retval)
1018                 return retval;
1019
1020 #ifndef NO_GETTEXT
1021         retval = setlocale(LC_MESSAGES, NULL);
1022         if (retval && *retval &&
1023                 strcmp(retval, "C") &&
1024                 strcmp(retval, "POSIX"))
1025                 return retval;
1026 #endif
1027
1028         return NULL;
1029 }
1030
1031 static void write_accept_language(struct strbuf *buf)
1032 {
1033         /*
1034          * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1035          * that, q-value will be smaller than 0.001, the minimum q-value the
1036          * HTTP specification allows. See
1037          * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1038          */
1039         const int MAX_DECIMAL_PLACES = 3;
1040         const int MAX_LANGUAGE_TAGS = 1000;
1041         const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1042         char **language_tags = NULL;
1043         int num_langs = 0;
1044         const char *s = get_preferred_languages();
1045         int i;
1046         struct strbuf tag = STRBUF_INIT;
1047
1048         /* Don't add Accept-Language header if no language is preferred. */
1049         if (!s)
1050                 return;
1051
1052         /*
1053          * Split the colon-separated string of preferred languages into
1054          * language_tags array.
1055          */
1056         do {
1057                 /* collect language tag */
1058                 for (; *s && (isalnum(*s) || *s == '_'); s++)
1059                         strbuf_addch(&tag, *s == '_' ? '-' : *s);
1060
1061                 /* skip .codeset, @modifier and any other unnecessary parts */
1062                 while (*s && *s != ':')
1063                         s++;
1064
1065                 if (tag.len) {
1066                         num_langs++;
1067                         REALLOC_ARRAY(language_tags, num_langs);
1068                         language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1069                         if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1070                                 break;
1071                 }
1072         } while (*s++);
1073
1074         /* write Accept-Language header into buf */
1075         if (num_langs) {
1076                 int last_buf_len = 0;
1077                 int max_q;
1078                 int decimal_places;
1079                 char q_format[32];
1080
1081                 /* add '*' */
1082                 REALLOC_ARRAY(language_tags, num_langs + 1);
1083                 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1084
1085                 /* compute decimal_places */
1086                 for (max_q = 1, decimal_places = 0;
1087                      max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1088                      decimal_places++, max_q *= 10)
1089                         ;
1090
1091                 sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1092
1093                 strbuf_addstr(buf, "Accept-Language: ");
1094
1095                 for (i = 0; i < num_langs; i++) {
1096                         if (i > 0)
1097                                 strbuf_addstr(buf, ", ");
1098
1099                         strbuf_addstr(buf, language_tags[i]);
1100
1101                         if (i > 0)
1102                                 strbuf_addf(buf, q_format, max_q - i);
1103
1104                         if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1105                                 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1106                                 break;
1107                         }
1108
1109                         last_buf_len = buf->len;
1110                 }
1111         }
1112
1113         /* free language tags -- last one is a static '*' */
1114         for (i = 0; i < num_langs - 1; i++)
1115                 free(language_tags[i]);
1116         free(language_tags);
1117 }
1118
1119 /*
1120  * Get an Accept-Language header which indicates user's preferred languages.
1121  *
1122  * Examples:
1123  *   LANGUAGE= -> ""
1124  *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1125  *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1126  *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1127  *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1128  *   LANGUAGE= LANG=C -> ""
1129  */
1130 static const char *get_accept_language(void)
1131 {
1132         if (!cached_accept_language) {
1133                 struct strbuf buf = STRBUF_INIT;
1134                 write_accept_language(&buf);
1135                 if (buf.len > 0)
1136                         cached_accept_language = strbuf_detach(&buf, NULL);
1137         }
1138
1139         return cached_accept_language;
1140 }
1141
1142 /* http_request() targets */
1143 #define HTTP_REQUEST_STRBUF     0
1144 #define HTTP_REQUEST_FILE       1
1145
1146 static int http_request(const char *url,
1147                         void *result, int target,
1148                         const struct http_get_options *options)
1149 {
1150         struct active_request_slot *slot;
1151         struct slot_results results;
1152         struct curl_slist *headers = NULL;
1153         struct strbuf buf = STRBUF_INIT;
1154         const char *accept_language;
1155         int ret;
1156
1157         slot = get_active_slot();
1158         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1159
1160         if (result == NULL) {
1161                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1162         } else {
1163                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1164                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1165
1166                 if (target == HTTP_REQUEST_FILE) {
1167                         long posn = ftell(result);
1168                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1169                                          fwrite);
1170                         if (posn > 0) {
1171                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1172                                 headers = curl_slist_append(headers, buf.buf);
1173                                 strbuf_reset(&buf);
1174                         }
1175                 } else
1176                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1177                                          fwrite_buffer);
1178         }
1179
1180         accept_language = get_accept_language();
1181
1182         if (accept_language)
1183                 headers = curl_slist_append(headers, accept_language);
1184
1185         strbuf_addstr(&buf, "Pragma:");
1186         if (options && options->no_cache)
1187                 strbuf_addstr(&buf, " no-cache");
1188         if (options && options->keep_error)
1189                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1190
1191         headers = curl_slist_append(headers, buf.buf);
1192
1193         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1194         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1195         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1196
1197         ret = run_one_slot(slot, &results);
1198
1199         if (options && options->content_type) {
1200                 struct strbuf raw = STRBUF_INIT;
1201                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1202                 extract_content_type(&raw, options->content_type,
1203                                      options->charset);
1204                 strbuf_release(&raw);
1205         }
1206
1207         if (options && options->effective_url)
1208                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1209                                 options->effective_url);
1210
1211         curl_slist_free_all(headers);
1212         strbuf_release(&buf);
1213
1214         return ret;
1215 }
1216
1217 /*
1218  * Update the "base" url to a more appropriate value, as deduced by
1219  * redirects seen when requesting a URL starting with "url".
1220  *
1221  * The "asked" parameter is a URL that we asked curl to access, and must begin
1222  * with "base".
1223  *
1224  * The "got" parameter is the URL that curl reported to us as where we ended
1225  * up.
1226  *
1227  * Returns 1 if we updated the base url, 0 otherwise.
1228  *
1229  * Our basic strategy is to compare "base" and "asked" to find the bits
1230  * specific to our request. We then strip those bits off of "got" to yield the
1231  * new base. So for example, if our base is "http://example.com/foo.git",
1232  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1233  * with "https://other.example.com/foo.git/info/refs". We would want the
1234  * new URL to become "https://other.example.com/foo.git".
1235  *
1236  * Note that this assumes a sane redirect scheme. It's entirely possible
1237  * in the example above to end up at a URL that does not even end in
1238  * "info/refs".  In such a case we simply punt, as there is not much we can
1239  * do (and such a scheme is unlikely to represent a real git repository,
1240  * which means we are likely about to abort anyway).
1241  */
1242 static int update_url_from_redirect(struct strbuf *base,
1243                                     const char *asked,
1244                                     const struct strbuf *got)
1245 {
1246         const char *tail;
1247         size_t tail_len;
1248
1249         if (!strcmp(asked, got->buf))
1250                 return 0;
1251
1252         if (!skip_prefix(asked, base->buf, &tail))
1253                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1254                     asked, base->buf);
1255
1256         tail_len = strlen(tail);
1257
1258         if (got->len < tail_len ||
1259             strcmp(tail, got->buf + got->len - tail_len))
1260                 return 0; /* insane redirect scheme */
1261
1262         strbuf_reset(base);
1263         strbuf_add(base, got->buf, got->len - tail_len);
1264         return 1;
1265 }
1266
1267 static int http_request_reauth(const char *url,
1268                                void *result, int target,
1269                                struct http_get_options *options)
1270 {
1271         int ret = http_request(url, result, target, options);
1272
1273         if (options && options->effective_url && options->base_url) {
1274                 if (update_url_from_redirect(options->base_url,
1275                                              url, options->effective_url)) {
1276                         credential_from_url(&http_auth, options->base_url->buf);
1277                         url = options->effective_url->buf;
1278                 }
1279         }
1280
1281         if (ret != HTTP_REAUTH)
1282                 return ret;
1283
1284         /*
1285          * If we are using KEEP_ERROR, the previous request may have
1286          * put cruft into our output stream; we should clear it out before
1287          * making our next request. We only know how to do this for
1288          * the strbuf case, but that is enough to satisfy current callers.
1289          */
1290         if (options && options->keep_error) {
1291                 switch (target) {
1292                 case HTTP_REQUEST_STRBUF:
1293                         strbuf_reset(result);
1294                         break;
1295                 default:
1296                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1297                 }
1298         }
1299
1300         credential_fill(&http_auth);
1301
1302         return http_request(url, result, target, options);
1303 }
1304
1305 int http_get_strbuf(const char *url,
1306                     struct strbuf *result,
1307                     struct http_get_options *options)
1308 {
1309         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1310 }
1311
1312 /*
1313  * Downloads a URL and stores the result in the given file.
1314  *
1315  * If a previous interrupted download is detected (i.e. a previous temporary
1316  * file is still around) the download is resumed.
1317  */
1318 static int http_get_file(const char *url, const char *filename,
1319                          struct http_get_options *options)
1320 {
1321         int ret;
1322         struct strbuf tmpfile = STRBUF_INIT;
1323         FILE *result;
1324
1325         strbuf_addf(&tmpfile, "%s.temp", filename);
1326         result = fopen(tmpfile.buf, "a");
1327         if (!result) {
1328                 error("Unable to open local file %s", tmpfile.buf);
1329                 ret = HTTP_ERROR;
1330                 goto cleanup;
1331         }
1332
1333         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1334         fclose(result);
1335
1336         if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1337                 ret = HTTP_ERROR;
1338 cleanup:
1339         strbuf_release(&tmpfile);
1340         return ret;
1341 }
1342
1343 int http_fetch_ref(const char *base, struct ref *ref)
1344 {
1345         struct http_get_options options = {0};
1346         char *url;
1347         struct strbuf buffer = STRBUF_INIT;
1348         int ret = -1;
1349
1350         options.no_cache = 1;
1351
1352         url = quote_ref_url(base, ref->name);
1353         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1354                 strbuf_rtrim(&buffer);
1355                 if (buffer.len == 40)
1356                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1357                 else if (starts_with(buffer.buf, "ref: ")) {
1358                         ref->symref = xstrdup(buffer.buf + 5);
1359                         ret = 0;
1360                 }
1361         }
1362
1363         strbuf_release(&buffer);
1364         free(url);
1365         return ret;
1366 }
1367
1368 /* Helpers for fetching packs */
1369 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1370 {
1371         char *url, *tmp;
1372         struct strbuf buf = STRBUF_INIT;
1373
1374         if (http_is_verbose)
1375                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1376
1377         end_url_with_slash(&buf, base_url);
1378         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1379         url = strbuf_detach(&buf, NULL);
1380
1381         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1382         tmp = strbuf_detach(&buf, NULL);
1383
1384         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1385                 error("Unable to get pack index %s", url);
1386                 free(tmp);
1387                 tmp = NULL;
1388         }
1389
1390         free(url);
1391         return tmp;
1392 }
1393
1394 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1395         unsigned char *sha1, const char *base_url)
1396 {
1397         struct packed_git *new_pack;
1398         char *tmp_idx = NULL;
1399         int ret;
1400
1401         if (has_pack_index(sha1)) {
1402                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1403                 if (!new_pack)
1404                         return -1; /* parse_pack_index() already issued error message */
1405                 goto add_pack;
1406         }
1407
1408         tmp_idx = fetch_pack_index(sha1, base_url);
1409         if (!tmp_idx)
1410                 return -1;
1411
1412         new_pack = parse_pack_index(sha1, tmp_idx);
1413         if (!new_pack) {
1414                 unlink(tmp_idx);
1415                 free(tmp_idx);
1416
1417                 return -1; /* parse_pack_index() already issued error message */
1418         }
1419
1420         ret = verify_pack_index(new_pack);
1421         if (!ret) {
1422                 close_pack_index(new_pack);
1423                 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1424         }
1425         free(tmp_idx);
1426         if (ret)
1427                 return -1;
1428
1429 add_pack:
1430         new_pack->next = *packs_head;
1431         *packs_head = new_pack;
1432         return 0;
1433 }
1434
1435 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1436 {
1437         struct http_get_options options = {0};
1438         int ret = 0, i = 0;
1439         char *url, *data;
1440         struct strbuf buf = STRBUF_INIT;
1441         unsigned char sha1[20];
1442
1443         end_url_with_slash(&buf, base_url);
1444         strbuf_addstr(&buf, "objects/info/packs");
1445         url = strbuf_detach(&buf, NULL);
1446
1447         options.no_cache = 1;
1448         ret = http_get_strbuf(url, &buf, &options);
1449         if (ret != HTTP_OK)
1450                 goto cleanup;
1451
1452         data = buf.buf;
1453         while (i < buf.len) {
1454                 switch (data[i]) {
1455                 case 'P':
1456                         i++;
1457                         if (i + 52 <= buf.len &&
1458                             starts_with(data + i, " pack-") &&
1459                             starts_with(data + i + 46, ".pack\n")) {
1460                                 get_sha1_hex(data + i + 6, sha1);
1461                                 fetch_and_setup_pack_index(packs_head, sha1,
1462                                                       base_url);
1463                                 i += 51;
1464                                 break;
1465                         }
1466                 default:
1467                         while (i < buf.len && data[i] != '\n')
1468                                 i++;
1469                 }
1470                 i++;
1471         }
1472
1473 cleanup:
1474         free(url);
1475         return ret;
1476 }
1477
1478 void release_http_pack_request(struct http_pack_request *preq)
1479 {
1480         if (preq->packfile != NULL) {
1481                 fclose(preq->packfile);
1482                 preq->packfile = NULL;
1483         }
1484         if (preq->range_header != NULL) {
1485                 curl_slist_free_all(preq->range_header);
1486                 preq->range_header = NULL;
1487         }
1488         preq->slot = NULL;
1489         free(preq->url);
1490 }
1491
1492 int finish_http_pack_request(struct http_pack_request *preq)
1493 {
1494         struct packed_git **lst;
1495         struct packed_git *p = preq->target;
1496         char *tmp_idx;
1497         struct child_process ip = CHILD_PROCESS_INIT;
1498         const char *ip_argv[8];
1499
1500         close_pack_index(p);
1501
1502         fclose(preq->packfile);
1503         preq->packfile = NULL;
1504
1505         lst = preq->lst;
1506         while (*lst != p)
1507                 lst = &((*lst)->next);
1508         *lst = (*lst)->next;
1509
1510         tmp_idx = xstrdup(preq->tmpfile);
1511         strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1512                ".idx.temp");
1513
1514         ip_argv[0] = "index-pack";
1515         ip_argv[1] = "-o";
1516         ip_argv[2] = tmp_idx;
1517         ip_argv[3] = preq->tmpfile;
1518         ip_argv[4] = NULL;
1519
1520         ip.argv = ip_argv;
1521         ip.git_cmd = 1;
1522         ip.no_stdin = 1;
1523         ip.no_stdout = 1;
1524
1525         if (run_command(&ip)) {
1526                 unlink(preq->tmpfile);
1527                 unlink(tmp_idx);
1528                 free(tmp_idx);
1529                 return -1;
1530         }
1531
1532         unlink(sha1_pack_index_name(p->sha1));
1533
1534         if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1535          || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1536                 free(tmp_idx);
1537                 return -1;
1538         }
1539
1540         install_packed_git(p);
1541         free(tmp_idx);
1542         return 0;
1543 }
1544
1545 struct http_pack_request *new_http_pack_request(
1546         struct packed_git *target, const char *base_url)
1547 {
1548         long prev_posn = 0;
1549         char range[RANGE_HEADER_SIZE];
1550         struct strbuf buf = STRBUF_INIT;
1551         struct http_pack_request *preq;
1552
1553         preq = xcalloc(1, sizeof(*preq));
1554         preq->target = target;
1555
1556         end_url_with_slash(&buf, base_url);
1557         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1558                 sha1_to_hex(target->sha1));
1559         preq->url = strbuf_detach(&buf, NULL);
1560
1561         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1562                 sha1_pack_name(target->sha1));
1563         preq->packfile = fopen(preq->tmpfile, "a");
1564         if (!preq->packfile) {
1565                 error("Unable to open local file %s for pack",
1566                       preq->tmpfile);
1567                 goto abort;
1568         }
1569
1570         preq->slot = get_active_slot();
1571         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1572         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1573         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1574         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1575                 no_pragma_header);
1576
1577         /*
1578          * If there is data present from a previous transfer attempt,
1579          * resume where it left off
1580          */
1581         prev_posn = ftell(preq->packfile);
1582         if (prev_posn>0) {
1583                 if (http_is_verbose)
1584                         fprintf(stderr,
1585                                 "Resuming fetch of pack %s at byte %ld\n",
1586                                 sha1_to_hex(target->sha1), prev_posn);
1587                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1588                 preq->range_header = curl_slist_append(NULL, range);
1589                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1590                         preq->range_header);
1591         }
1592
1593         return preq;
1594
1595 abort:
1596         free(preq->url);
1597         free(preq);
1598         return NULL;
1599 }
1600
1601 /* Helpers for fetching objects (loose) */
1602 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1603                                void *data)
1604 {
1605         unsigned char expn[4096];
1606         size_t size = eltsize * nmemb;
1607         int posn = 0;
1608         struct http_object_request *freq =
1609                 (struct http_object_request *)data;
1610         do {
1611                 ssize_t retval = xwrite(freq->localfile,
1612                                         (char *) ptr + posn, size - posn);
1613                 if (retval < 0)
1614                         return posn;
1615                 posn += retval;
1616         } while (posn < size);
1617
1618         freq->stream.avail_in = size;
1619         freq->stream.next_in = (void *)ptr;
1620         do {
1621                 freq->stream.next_out = expn;
1622                 freq->stream.avail_out = sizeof(expn);
1623                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1624                 git_SHA1_Update(&freq->c, expn,
1625                                 sizeof(expn) - freq->stream.avail_out);
1626         } while (freq->stream.avail_in && freq->zret == Z_OK);
1627         return size;
1628 }
1629
1630 struct http_object_request *new_http_object_request(const char *base_url,
1631         unsigned char *sha1)
1632 {
1633         char *hex = sha1_to_hex(sha1);
1634         const char *filename;
1635         char prevfile[PATH_MAX];
1636         int prevlocal;
1637         char prev_buf[PREV_BUF_SIZE];
1638         ssize_t prev_read = 0;
1639         long prev_posn = 0;
1640         char range[RANGE_HEADER_SIZE];
1641         struct curl_slist *range_header = NULL;
1642         struct http_object_request *freq;
1643
1644         freq = xcalloc(1, sizeof(*freq));
1645         hashcpy(freq->sha1, sha1);
1646         freq->localfile = -1;
1647
1648         filename = sha1_file_name(sha1);
1649         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1650                  "%s.temp", filename);
1651
1652         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1653         unlink_or_warn(prevfile);
1654         rename(freq->tmpfile, prevfile);
1655         unlink_or_warn(freq->tmpfile);
1656
1657         if (freq->localfile != -1)
1658                 error("fd leakage in start: %d", freq->localfile);
1659         freq->localfile = open(freq->tmpfile,
1660                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1661         /*
1662          * This could have failed due to the "lazy directory creation";
1663          * try to mkdir the last path component.
1664          */
1665         if (freq->localfile < 0 && errno == ENOENT) {
1666                 char *dir = strrchr(freq->tmpfile, '/');
1667                 if (dir) {
1668                         *dir = 0;
1669                         mkdir(freq->tmpfile, 0777);
1670                         *dir = '/';
1671                 }
1672                 freq->localfile = open(freq->tmpfile,
1673                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1674         }
1675
1676         if (freq->localfile < 0) {
1677                 error("Couldn't create temporary file %s: %s",
1678                       freq->tmpfile, strerror(errno));
1679                 goto abort;
1680         }
1681
1682         git_inflate_init(&freq->stream);
1683
1684         git_SHA1_Init(&freq->c);
1685
1686         freq->url = get_remote_object_url(base_url, hex, 0);
1687
1688         /*
1689          * If a previous temp file is present, process what was already
1690          * fetched.
1691          */
1692         prevlocal = open(prevfile, O_RDONLY);
1693         if (prevlocal != -1) {
1694                 do {
1695                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1696                         if (prev_read>0) {
1697                                 if (fwrite_sha1_file(prev_buf,
1698                                                      1,
1699                                                      prev_read,
1700                                                      freq) == prev_read) {
1701                                         prev_posn += prev_read;
1702                                 } else {
1703                                         prev_read = -1;
1704                                 }
1705                         }
1706                 } while (prev_read > 0);
1707                 close(prevlocal);
1708         }
1709         unlink_or_warn(prevfile);
1710
1711         /*
1712          * Reset inflate/SHA1 if there was an error reading the previous temp
1713          * file; also rewind to the beginning of the local file.
1714          */
1715         if (prev_read == -1) {
1716                 memset(&freq->stream, 0, sizeof(freq->stream));
1717                 git_inflate_init(&freq->stream);
1718                 git_SHA1_Init(&freq->c);
1719                 if (prev_posn>0) {
1720                         prev_posn = 0;
1721                         lseek(freq->localfile, 0, SEEK_SET);
1722                         if (ftruncate(freq->localfile, 0) < 0) {
1723                                 error("Couldn't truncate temporary file %s: %s",
1724                                           freq->tmpfile, strerror(errno));
1725                                 goto abort;
1726                         }
1727                 }
1728         }
1729
1730         freq->slot = get_active_slot();
1731
1732         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1733         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1734         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1735         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1736         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1737
1738         /*
1739          * If we have successfully processed data from a previous fetch
1740          * attempt, only fetch the data we don't already have.
1741          */
1742         if (prev_posn>0) {
1743                 if (http_is_verbose)
1744                         fprintf(stderr,
1745                                 "Resuming fetch of object %s at byte %ld\n",
1746                                 hex, prev_posn);
1747                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1748                 range_header = curl_slist_append(range_header, range);
1749                 curl_easy_setopt(freq->slot->curl,
1750                                  CURLOPT_HTTPHEADER, range_header);
1751         }
1752
1753         return freq;
1754
1755 abort:
1756         free(freq->url);
1757         free(freq);
1758         return NULL;
1759 }
1760
1761 void process_http_object_request(struct http_object_request *freq)
1762 {
1763         if (freq->slot == NULL)
1764                 return;
1765         freq->curl_result = freq->slot->curl_result;
1766         freq->http_code = freq->slot->http_code;
1767         freq->slot = NULL;
1768 }
1769
1770 int finish_http_object_request(struct http_object_request *freq)
1771 {
1772         struct stat st;
1773
1774         close(freq->localfile);
1775         freq->localfile = -1;
1776
1777         process_http_object_request(freq);
1778
1779         if (freq->http_code == 416) {
1780                 warning("requested range invalid; we may already have all the data.");
1781         } else if (freq->curl_result != CURLE_OK) {
1782                 if (stat(freq->tmpfile, &st) == 0)
1783                         if (st.st_size == 0)
1784                                 unlink_or_warn(freq->tmpfile);
1785                 return -1;
1786         }
1787
1788         git_inflate_end(&freq->stream);
1789         git_SHA1_Final(freq->real_sha1, &freq->c);
1790         if (freq->zret != Z_STREAM_END) {
1791                 unlink_or_warn(freq->tmpfile);
1792                 return -1;
1793         }
1794         if (hashcmp(freq->sha1, freq->real_sha1)) {
1795                 unlink_or_warn(freq->tmpfile);
1796                 return -1;
1797         }
1798         freq->rename =
1799                 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1800
1801         return freq->rename;
1802 }
1803
1804 void abort_http_object_request(struct http_object_request *freq)
1805 {
1806         unlink_or_warn(freq->tmpfile);
1807
1808         release_http_object_request(freq);
1809 }
1810
1811 void release_http_object_request(struct http_object_request *freq)
1812 {
1813         if (freq->localfile != -1) {
1814                 close(freq->localfile);
1815                 freq->localfile = -1;
1816         }
1817         if (freq->url != NULL) {
1818                 free(freq->url);
1819                 freq->url = NULL;
1820         }
1821         if (freq->slot != NULL) {
1822                 freq->slot->callback_func = NULL;
1823                 freq->slot->callback_data = NULL;
1824                 release_active_slot(freq->slot);
1825                 freq->slot = NULL;
1826         }
1827 }