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 int active_requests;
  15 int http_is_verbose;
  16 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  17
  18 #if LIBCURL_VERSION_NUM >= 0x070a06
  19 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  20 #endif
  21
  22 static int min_curl_sessions = 1;
  23 static int curl_session_count;
  24 #ifdef USE_CURL_MULTI
  25 static int max_requests = -1;
  26 static CURLM *curlm;
  27 #endif
  28 #ifndef NO_CURL_EASY_DUPHANDLE
  29 static CURL *curl_default;
  30 #endif
  31
  32 #define PREV_BUF_SIZE 4096
  33 #define RANGE_HEADER_SIZE 30
  34
  35 char curl_errorstr[CURL_ERROR_SIZE];
  36
  37 static int curl_ssl_verify = -1;
  38 static int curl_ssl_try;
  39 static const char *ssl_cert;
  40 static const char *ssl_cipherlist;
  41 #if LIBCURL_VERSION_NUM >= 0x070903
  42 static const char *ssl_key;
  43 #endif
  44 #if LIBCURL_VERSION_NUM >= 0x070908
  45 static const char *ssl_capath;
  46 #endif
  47 static const char *ssl_cainfo;
  48 static long curl_low_speed_limit = -1;
  49 static long curl_low_speed_time = -1;
  50 static int curl_ftp_no_epsv;
  51 static const char *curl_http_proxy;
  52 static const char *curl_cookie_file;
  53 static int curl_save_cookies;
  54 struct credential http_auth = CREDENTIAL_INIT;
  55 static int http_proactive_auth;
  56 static const char *user_agent;
  57
  58 #if LIBCURL_VERSION_NUM >= 0x071700
  59 /* Use CURLOPT_KEYPASSWD as is */
  60 #elif LIBCURL_VERSION_NUM >= 0x070903
  61 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  62 #else
  63 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  64 #endif
  65
  66 static struct credential cert_auth = CREDENTIAL_INIT;
  67 static int ssl_cert_password_required;
  68 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  69 static unsigned long http_auth_methods = CURLAUTH_ANY;
  70 #endif
  71
  72 static struct curl_slist *pragma_header;
  73 static struct curl_slist *no_pragma_header;
  74
  75 static struct active_request_slot *active_queue_head;
  76
  77 static char *cached_accept_language;
  78
  79 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  80 {
  81         size_t size = eltsize * nmemb;
  82         struct buffer *buffer = buffer_;
  83
  84         if (size > buffer->buf.len - buffer->posn)
  85                 size = buffer->buf.len - buffer->posn;
  86         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  87         buffer->posn += size;
  88
  89         return size;
  90 }
  91
  92 #ifndef NO_CURL_IOCTL
  93 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  94 {
  95         struct buffer *buffer = clientp;
  96
  97         switch (cmd) {
  98         case CURLIOCMD_NOP:
  99                 return CURLIOE_OK;
 100
 101         case CURLIOCMD_RESTARTREAD:
 102                 buffer->posn = 0;
 103                 return CURLIOE_OK;
 104
 105         default:
 106                 return CURLIOE_UNKNOWNCMD;
 107         }
 108 }
 109 #endif
 110
 111 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 112 {
 113         size_t size = eltsize * nmemb;
 114         struct strbuf *buffer = buffer_;
 115
 116         strbuf_add(buffer, ptr, size);
 117         return size;
 118 }
 119
 120 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 121 {
 122         return eltsize * nmemb;
 123 }
 124
 125 static void closedown_active_slot(struct active_request_slot *slot)
 126 {
 127         active_requests--;
 128         slot->in_use = 0;
 129 }
 130
 131 static void finish_active_slot(struct active_request_slot *slot)
 132 {
 133         closedown_active_slot(slot);
 134         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 135
 136         if (slot->finished != NULL)
 137                 (*slot->finished) = 1;
 138
 139         /* Store slot results so they can be read after the slot is reused */
 140         if (slot->results != NULL) {
 141                 slot->results->curl_result = slot->curl_result;
 142                 slot->results->http_code = slot->http_code;
 143 #if LIBCURL_VERSION_NUM >= 0x070a08
 144                 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 145                                   &slot->results->auth_avail);
 146 #else
 147                 slot->results->auth_avail = 0;
 148 #endif
 149         }
 150
 151         /* Run callback if appropriate */
 152         if (slot->callback_func != NULL)
 153                 slot->callback_func(slot->callback_data);
 154 }
 155
 156 #ifdef USE_CURL_MULTI
 157 static void process_curl_messages(void)
 158 {
 159         int num_messages;
 160         struct active_request_slot *slot;
 161         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 162
 163         while (curl_message != NULL) {
 164                 if (curl_message->msg == CURLMSG_DONE) {
 165                         int curl_result = curl_message->data.result;
 166                         slot = active_queue_head;
 167                         while (slot != NULL &&
 168                                slot->curl != curl_message->easy_handle)
 169                                 slot = slot->next;
 170                         if (slot != NULL) {
 171                                 curl_multi_remove_handle(curlm, slot->curl);
 172                                 slot->curl_result = curl_result;
 173                                 finish_active_slot(slot);
 174                         } else {
 175                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 176                         }
 177                 } else {
 178                         fprintf(stderr, "Unknown CURL message received: %d\n",
 179                                 (int)curl_message->msg);
 180                 }
 181                 curl_message = curl_multi_info_read(curlm, &num_messages);
 182         }
 183 }
 184 #endif
 185
 186 static int http_options(const char *var, const char *value, void *cb)
 187 {
 188         if (!strcmp("http.sslverify", var)) {
 189                 curl_ssl_verify = git_config_bool(var, value);
 190                 return 0;
 191         }
 192         if (!strcmp("http.sslcipherlist", var))
 193                 return git_config_string(&ssl_cipherlist, var, value);
 194         if (!strcmp("http.sslcert", var))
 195                 return git_config_string(&ssl_cert, var, value);
 196 #if LIBCURL_VERSION_NUM >= 0x070903
 197         if (!strcmp("http.sslkey", var))
 198                 return git_config_string(&ssl_key, var, value);
 199 #endif
 200 #if LIBCURL_VERSION_NUM >= 0x070908
 201         if (!strcmp("http.sslcapath", var))
 202                 return git_config_string(&ssl_capath, var, value);
 203 #endif
 204         if (!strcmp("http.sslcainfo", var))
 205                 return git_config_string(&ssl_cainfo, var, value);
 206         if (!strcmp("http.sslcertpasswordprotected", var)) {
 207                 ssl_cert_password_required = git_config_bool(var, value);
 208                 return 0;
 209         }
 210         if (!strcmp("http.ssltry", var)) {
 211                 curl_ssl_try = git_config_bool(var, value);
 212                 return 0;
 213         }
 214         if (!strcmp("http.minsessions", var)) {
 215                 min_curl_sessions = git_config_int(var, value);
 216 #ifndef USE_CURL_MULTI
 217                 if (min_curl_sessions > 1)
 218                         min_curl_sessions = 1;
 219 #endif
 220                 return 0;
 221         }
 222 #ifdef USE_CURL_MULTI
 223         if (!strcmp("http.maxrequests", var)) {
 224                 max_requests = git_config_int(var, value);
 225                 return 0;
 226         }
 227 #endif
 228         if (!strcmp("http.lowspeedlimit", var)) {
 229                 curl_low_speed_limit = (long)git_config_int(var, value);
 230                 return 0;
 231         }
 232         if (!strcmp("http.lowspeedtime", var)) {
 233                 curl_low_speed_time = (long)git_config_int(var, value);
 234                 return 0;
 235         }
 236
 237         if (!strcmp("http.noepsv", var)) {
 238                 curl_ftp_no_epsv = git_config_bool(var, value);
 239                 return 0;
 240         }
 241         if (!strcmp("http.proxy", var))
 242                 return git_config_string(&curl_http_proxy, var, value);
 243
 244         if (!strcmp("http.cookiefile", var))
 245                 return git_config_string(&curl_cookie_file, var, value);
 246         if (!strcmp("http.savecookies", var)) {
 247                 curl_save_cookies = git_config_bool(var, value);
 248                 return 0;
 249         }
 250
 251         if (!strcmp("http.postbuffer", var)) {
 252                 http_post_buffer = git_config_int(var, value);
 253                 if (http_post_buffer < LARGE_PACKET_MAX)
 254                         http_post_buffer = LARGE_PACKET_MAX;
 255                 return 0;
 256         }
 257
 258         if (!strcmp("http.useragent", var))
 259                 return git_config_string(&user_agent, var, value);
 260
 261         /* Fall back on the default ones */
 262         return git_default_config(var, value, cb);
 263 }
 264
 265 static void init_curl_http_auth(CURL *result)
 266 {
 267         if (!http_auth.username)
 268                 return;
 269
 270         credential_fill(&http_auth);
 271
 272 #if LIBCURL_VERSION_NUM >= 0x071301
 273         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 274         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 275 #else
 276         {
 277                 static struct strbuf up = STRBUF_INIT;
 278                 /*
 279                  * Note that we assume we only ever have a single set of
 280                  * credentials in a given program run, so we do not have
 281                  * to worry about updating this buffer, only setting its
 282                  * initial value.
 283                  */
 284                 if (!up.len)
 285                         strbuf_addf(&up, "%s:%s",
 286                                 http_auth.username, http_auth.password);
 287                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 288         }
 289 #endif
 290 }
 291
 292 static int has_cert_password(void)
 293 {
 294         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 295                 return 0;
 296         if (!cert_auth.password) {
 297                 cert_auth.protocol = xstrdup("cert");
 298                 cert_auth.username = xstrdup("");
 299                 cert_auth.path = xstrdup(ssl_cert);
 300                 credential_fill(&cert_auth);
 301         }
 302         return 1;
 303 }
 304
 305 #if LIBCURL_VERSION_NUM >= 0x071900
 306 static void set_curl_keepalive(CURL *c)
 307 {
 308         curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 309 }
 310
 311 #elif LIBCURL_VERSION_NUM >= 0x071000
 312 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 313 {
 314         int ka = 1;
 315         int rc;
 316         socklen_t len = (socklen_t)sizeof(ka);
 317
 318         if (type != CURLSOCKTYPE_IPCXN)
 319                 return 0;
 320
 321         rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 322         if (rc < 0)
 323                 warning("unable to set SO_KEEPALIVE on socket %s",
 324                         strerror(errno));
 325
 326         return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 327 }
 328
 329 static void set_curl_keepalive(CURL *c)
 330 {
 331         curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 332 }
 333
 334 #else
 335 static void set_curl_keepalive(CURL *c)
 336 {
 337         /* not supported on older curl versions */
 338 }
 339 #endif
 340
 341 static CURL *get_curl_handle(void)
 342 {
 343         CURL *result = curl_easy_init();
 344         long allowed_protocols = 0;
 345
 346         if (!result)
 347                 die("curl_easy_init failed");
 348
 349         if (!curl_ssl_verify) {
 350                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 351                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 352         } else {
 353                 /* Verify authenticity of the peer's certificate */
 354                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 355                 /* The name in the cert must match whom we tried to connect */
 356                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 357         }
 358
 359 #if LIBCURL_VERSION_NUM >= 0x070907
 360         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 361 #endif
 362 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 363         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 364 #endif
 365
 366         if (http_proactive_auth)
 367                 init_curl_http_auth(result);
 368
 369         if (getenv("GIT_SSL_CIPHER_LIST"))
 370                 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
 371
 372         if (ssl_cipherlist != NULL && *ssl_cipherlist)
 373                 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
 374                                 ssl_cipherlist);
 375
 376         if (ssl_cert != NULL)
 377                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 378         if (has_cert_password())
 379                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 380 #if LIBCURL_VERSION_NUM >= 0x070903
 381         if (ssl_key != NULL)
 382                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 383 #endif
 384 #if LIBCURL_VERSION_NUM >= 0x070908
 385         if (ssl_capath != NULL)
 386                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 387 #endif
 388         if (ssl_cainfo != NULL)
 389                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 390
 391         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 392                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 393                                  curl_low_speed_limit);
 394                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 395                                  curl_low_speed_time);
 396         }
 397
 398         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 399         curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
 400 #if LIBCURL_VERSION_NUM >= 0x071301
 401         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 402 #elif LIBCURL_VERSION_NUM >= 0x071101
 403         curl_easy_setopt(result, CURLOPT_POST301, 1);
 404 #endif
 405 #if LIBCURL_VERSION_NUM >= 0x071304
 406         if (is_transport_allowed("http"))
 407                 allowed_protocols |= CURLPROTO_HTTP;
 408         if (is_transport_allowed("https"))
 409                 allowed_protocols |= CURLPROTO_HTTPS;
 410         if (is_transport_allowed("ftp"))
 411                 allowed_protocols |= CURLPROTO_FTP;
 412         if (is_transport_allowed("ftps"))
 413                 allowed_protocols |= CURLPROTO_FTPS;
 414         curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 415 #else
 416         if (transport_restrict_protocols())
 417                 warning("protocol restrictions not applied to curl redirects because\n"
 418                         "your curl version is too old (>= 7.19.4)");
 419 #endif
 420
 421         if (getenv("GIT_CURL_VERBOSE"))
 422                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 423
 424         curl_easy_setopt(result, CURLOPT_USERAGENT,
 425                 user_agent ? user_agent : git_user_agent());
 426
 427         if (curl_ftp_no_epsv)
 428                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 429
 430 #ifdef CURLOPT_USE_SSL
 431         if (curl_ssl_try)
 432                 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 433 #endif
 434
 435         if (curl_http_proxy) {
 436                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 437         }
 438 #if LIBCURL_VERSION_NUM >= 0x070a07
 439         curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 440 #endif
 441
 442         set_curl_keepalive(result);
 443
 444         return result;
 445 }
 446
 447 static void set_from_env(const char **var, const char *envname)
 448 {
 449         const char *val = getenv(envname);
 450         if (val)
 451                 *var = val;
 452 }
 453
 454 void http_init(struct remote *remote, const char *url, int proactive_auth)
 455 {
 456         char *low_speed_limit;
 457         char *low_speed_time;
 458         char *normalized_url;
 459         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 460
 461         config.section = "http";
 462         config.key = NULL;
 463         config.collect_fn = http_options;
 464         config.cascade_fn = git_default_config;
 465         config.cb = NULL;
 466
 467         http_is_verbose = 0;
 468         normalized_url = url_normalize(url, &config.url);
 469
 470         git_config(urlmatch_config_entry, &config);
 471         free(normalized_url);
 472
 473         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 474                 die("curl_global_init failed");
 475
 476         http_proactive_auth = proactive_auth;
 477
 478         if (remote && remote->http_proxy)
 479                 curl_http_proxy = xstrdup(remote->http_proxy);
 480
 481         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 482         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 483
 484 #ifdef USE_CURL_MULTI
 485         {
 486                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 487                 if (http_max_requests != NULL)
 488                         max_requests = atoi(http_max_requests);
 489         }
 490
 491         curlm = curl_multi_init();
 492         if (!curlm)
 493                 die("curl_multi_init failed");
 494 #endif
 495
 496         if (getenv("GIT_SSL_NO_VERIFY"))
 497                 curl_ssl_verify = 0;
 498
 499         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 500 #if LIBCURL_VERSION_NUM >= 0x070903
 501         set_from_env(&ssl_key, "GIT_SSL_KEY");
 502 #endif
 503 #if LIBCURL_VERSION_NUM >= 0x070908
 504         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 505 #endif
 506         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 507
 508         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 509
 510         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 511         if (low_speed_limit != NULL)
 512                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 513         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 514         if (low_speed_time != NULL)
 515                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 516
 517         if (curl_ssl_verify == -1)
 518                 curl_ssl_verify = 1;
 519
 520         curl_session_count = 0;
 521 #ifdef USE_CURL_MULTI
 522         if (max_requests < 1)
 523                 max_requests = DEFAULT_MAX_REQUESTS;
 524 #endif
 525
 526         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 527                 curl_ftp_no_epsv = 1;
 528
 529         if (url) {
 530                 credential_from_url(&http_auth, url);
 531                 if (!ssl_cert_password_required &&
 532                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 533                     starts_with(url, "https://"))
 534                         ssl_cert_password_required = 1;
 535         }
 536
 537 #ifndef NO_CURL_EASY_DUPHANDLE
 538         curl_default = get_curl_handle();
 539 #endif
 540 }
 541
 542 void http_cleanup(void)
 543 {
 544         struct active_request_slot *slot = active_queue_head;
 545
 546         while (slot != NULL) {
 547                 struct active_request_slot *next = slot->next;
 548                 if (slot->curl != NULL) {
 549 #ifdef USE_CURL_MULTI
 550                         curl_multi_remove_handle(curlm, slot->curl);
 551 #endif
 552                         curl_easy_cleanup(slot->curl);
 553                 }
 554                 free(slot);
 555                 slot = next;
 556         }
 557         active_queue_head = NULL;
 558
 559 #ifndef NO_CURL_EASY_DUPHANDLE
 560         curl_easy_cleanup(curl_default);
 561 #endif
 562
 563 #ifdef USE_CURL_MULTI
 564         curl_multi_cleanup(curlm);
 565 #endif
 566         curl_global_cleanup();
 567
 568         curl_slist_free_all(pragma_header);
 569         pragma_header = NULL;
 570
 571         curl_slist_free_all(no_pragma_header);
 572         no_pragma_header = NULL;
 573
 574         if (curl_http_proxy) {
 575                 free((void *)curl_http_proxy);
 576                 curl_http_proxy = NULL;
 577         }
 578
 579         if (cert_auth.password != NULL) {
 580                 memset(cert_auth.password, 0, strlen(cert_auth.password));
 581                 free(cert_auth.password);
 582                 cert_auth.password = NULL;
 583         }
 584         ssl_cert_password_required = 0;
 585
 586         free(cached_accept_language);
 587         cached_accept_language = NULL;
 588 }
 589
 590 struct active_request_slot *get_active_slot(void)
 591 {
 592         struct active_request_slot *slot = active_queue_head;
 593         struct active_request_slot *newslot;
 594
 595 #ifdef USE_CURL_MULTI
 596         int num_transfers;
 597
 598         /* Wait for a slot to open up if the queue is full */
 599         while (active_requests >= max_requests) {
 600                 curl_multi_perform(curlm, &num_transfers);
 601                 if (num_transfers < active_requests)
 602                         process_curl_messages();
 603         }
 604 #endif
 605
 606         while (slot != NULL && slot->in_use)
 607                 slot = slot->next;
 608
 609         if (slot == NULL) {
 610                 newslot = xmalloc(sizeof(*newslot));
 611                 newslot->curl = NULL;
 612                 newslot->in_use = 0;
 613                 newslot->next = NULL;
 614
 615                 slot = active_queue_head;
 616                 if (slot == NULL) {
 617                         active_queue_head = newslot;
 618                 } else {
 619                         while (slot->next != NULL)
 620                                 slot = slot->next;
 621                         slot->next = newslot;
 622                 }
 623                 slot = newslot;
 624         }
 625
 626         if (slot->curl == NULL) {
 627 #ifdef NO_CURL_EASY_DUPHANDLE
 628                 slot->curl = get_curl_handle();
 629 #else
 630                 slot->curl = curl_easy_duphandle(curl_default);
 631 #endif
 632                 curl_session_count++;
 633         }
 634
 635         active_requests++;
 636         slot->in_use = 1;
 637         slot->results = NULL;
 638         slot->finished = NULL;
 639         slot->callback_data = NULL;
 640         slot->callback_func = NULL;
 641         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 642         if (curl_save_cookies)
 643                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 644         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 645         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 646         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 647         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 648         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 649         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 650         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 651         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 652         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 653 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 654         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 655 #endif
 656         if (http_auth.password)
 657                 init_curl_http_auth(slot->curl);
 658
 659         return slot;
 660 }
 661
 662 int start_active_slot(struct active_request_slot *slot)
 663 {
 664 #ifdef USE_CURL_MULTI
 665         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 666         int num_transfers;
 667
 668         if (curlm_result != CURLM_OK &&
 669             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 670                 active_requests--;
 671                 slot->in_use = 0;
 672                 return 0;
 673         }
 674
 675         /*
 676          * We know there must be something to do, since we just added
 677          * something.
 678          */
 679         curl_multi_perform(curlm, &num_transfers);
 680 #endif
 681         return 1;
 682 }
 683
 684 #ifdef USE_CURL_MULTI
 685 struct fill_chain {
 686         void *data;
 687         int (*fill)(void *);
 688         struct fill_chain *next;
 689 };
 690
 691 static struct fill_chain *fill_cfg;
 692
 693 void add_fill_function(void *data, int (*fill)(void *))
 694 {
 695         struct fill_chain *new = xmalloc(sizeof(*new));
 696         struct fill_chain **linkp = &fill_cfg;
 697         new->data = data;
 698         new->fill = fill;
 699         new->next = NULL;
 700         while (*linkp)
 701                 linkp = &(*linkp)->next;
 702         *linkp = new;
 703 }
 704
 705 void fill_active_slots(void)
 706 {
 707         struct active_request_slot *slot = active_queue_head;
 708
 709         while (active_requests < max_requests) {
 710                 struct fill_chain *fill;
 711                 for (fill = fill_cfg; fill; fill = fill->next)
 712                         if (fill->fill(fill->data))
 713                                 break;
 714
 715                 if (!fill)
 716                         break;
 717         }
 718
 719         while (slot != NULL) {
 720                 if (!slot->in_use && slot->curl != NULL
 721                         && curl_session_count > min_curl_sessions) {
 722                         curl_easy_cleanup(slot->curl);
 723                         slot->curl = NULL;
 724                         curl_session_count--;
 725                 }
 726                 slot = slot->next;
 727         }
 728 }
 729
 730 void step_active_slots(void)
 731 {
 732         int num_transfers;
 733         CURLMcode curlm_result;
 734
 735         do {
 736                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 737         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 738         if (num_transfers < active_requests) {
 739                 process_curl_messages();
 740                 fill_active_slots();
 741         }
 742 }
 743 #endif
 744
 745 void run_active_slot(struct active_request_slot *slot)
 746 {
 747 #ifdef USE_CURL_MULTI
 748         fd_set readfds;
 749         fd_set writefds;
 750         fd_set excfds;
 751         int max_fd;
 752         struct timeval select_timeout;
 753         int finished = 0;
 754
 755         slot->finished = &finished;
 756         while (!finished) {
 757                 step_active_slots();
 758
 759                 if (slot->in_use) {
 760 #if LIBCURL_VERSION_NUM >= 0x070f04
 761                         long curl_timeout;
 762                         curl_multi_timeout(curlm, &curl_timeout);
 763                         if (curl_timeout == 0) {
 764                                 continue;
 765                         } else if (curl_timeout == -1) {
 766                                 select_timeout.tv_sec  = 0;
 767                                 select_timeout.tv_usec = 50000;
 768                         } else {
 769                                 select_timeout.tv_sec  =  curl_timeout / 1000;
 770                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 771                         }
 772 #else
 773                         select_timeout.tv_sec  = 0;
 774                         select_timeout.tv_usec = 50000;
 775 #endif
 776
 777                         max_fd = -1;
 778                         FD_ZERO(&readfds);
 779                         FD_ZERO(&writefds);
 780                         FD_ZERO(&excfds);
 781                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 782
 783                         /*
 784                          * It can happen that curl_multi_timeout returns a pathologically
 785                          * long timeout when curl_multi_fdset returns no file descriptors
 786                          * to read.  See commit message for more details.
 787                          */
 788                         if (max_fd < 0 &&
 789                             (select_timeout.tv_sec > 0 ||
 790                              select_timeout.tv_usec > 50000)) {
 791                                 select_timeout.tv_sec  = 0;
 792                                 select_timeout.tv_usec = 50000;
 793                         }
 794
 795                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 796                 }
 797         }
 798 #else
 799         while (slot->in_use) {
 800                 slot->curl_result = curl_easy_perform(slot->curl);
 801                 finish_active_slot(slot);
 802         }
 803 #endif
 804 }
 805
 806 static void release_active_slot(struct active_request_slot *slot)
 807 {
 808         closedown_active_slot(slot);
 809         if (slot->curl && curl_session_count > min_curl_sessions) {
 810 #ifdef USE_CURL_MULTI
 811                 curl_multi_remove_handle(curlm, slot->curl);
 812 #endif
 813                 curl_easy_cleanup(slot->curl);
 814                 slot->curl = NULL;
 815                 curl_session_count--;
 816         }
 817 #ifdef USE_CURL_MULTI
 818         fill_active_slots();
 819 #endif
 820 }
 821
 822 void finish_all_active_slots(void)
 823 {
 824         struct active_request_slot *slot = active_queue_head;
 825
 826         while (slot != NULL)
 827                 if (slot->in_use) {
 828                         run_active_slot(slot);
 829                         slot = active_queue_head;
 830                 } else {
 831                         slot = slot->next;
 832                 }
 833 }
 834
 835 /* Helpers for modifying and creating URLs */
 836 static inline int needs_quote(int ch)
 837 {
 838         if (((ch >= 'A') && (ch <= 'Z'))
 839                         || ((ch >= 'a') && (ch <= 'z'))
 840                         || ((ch >= '0') && (ch <= '9'))
 841                         || (ch == '/')
 842                         || (ch == '-')
 843                         || (ch == '.'))
 844                 return 0;
 845         return 1;
 846 }
 847
 848 static char *quote_ref_url(const char *base, const char *ref)
 849 {
 850         struct strbuf buf = STRBUF_INIT;
 851         const char *cp;
 852         int ch;
 853
 854         end_url_with_slash(&buf, base);
 855
 856         for (cp = ref; (ch = *cp) != 0; cp++)
 857                 if (needs_quote(ch))
 858                         strbuf_addf(&buf, "%%%02x", ch);
 859                 else
 860                         strbuf_addch(&buf, *cp);
 861
 862         return strbuf_detach(&buf, NULL);
 863 }
 864
 865 void append_remote_object_url(struct strbuf *buf, const char *url,
 866                               const char *hex,
 867                               int only_two_digit_prefix)
 868 {
 869         end_url_with_slash(buf, url);
 870
 871         strbuf_addf(buf, "objects/%.*s/", 2, hex);
 872         if (!only_two_digit_prefix)
 873                 strbuf_addf(buf, "%s", hex+2);
 874 }
 875
 876 char *get_remote_object_url(const char *url, const char *hex,
 877                             int only_two_digit_prefix)
 878 {
 879         struct strbuf buf = STRBUF_INIT;
 880         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 881         return strbuf_detach(&buf, NULL);
 882 }
 883
 884 static int handle_curl_result(struct slot_results *results)
 885 {
 886         /*
 887          * If we see a failing http code with CURLE_OK, we have turned off
 888          * FAILONERROR (to keep the server's custom error response), and should
 889          * translate the code into failure here.
 890          */
 891         if (results->curl_result == CURLE_OK &&
 892             results->http_code >= 400) {
 893                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
 894                 /*
 895                  * Normally curl will already have put the "reason phrase"
 896                  * from the server into curl_errorstr; unfortunately without
 897                  * FAILONERROR it is lost, so we can give only the numeric
 898                  * status code.
 899                  */
 900                 snprintf(curl_errorstr, sizeof(curl_errorstr),
 901                          "The requested URL returned error: %ld",
 902                          results->http_code);
 903         }
 904
 905         if (results->curl_result == CURLE_OK) {
 906                 credential_approve(&http_auth);
 907                 return HTTP_OK;
 908         } else if (missing_target(results))
 909                 return HTTP_MISSING_TARGET;
 910         else if (results->http_code == 401) {
 911                 if (http_auth.username && http_auth.password) {
 912                         credential_reject(&http_auth);
 913                         return HTTP_NOAUTH;
 914                 } else {
 915 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 916                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
 917 #endif
 918                         return HTTP_REAUTH;
 919                 }
 920         } else {
 921 #if LIBCURL_VERSION_NUM >= 0x070c00
 922                 if (!curl_errorstr[0])
 923                         strlcpy(curl_errorstr,
 924                                 curl_easy_strerror(results->curl_result),
 925                                 sizeof(curl_errorstr));
 926 #endif
 927                 return HTTP_ERROR;
 928         }
 929 }
 930
 931 int run_one_slot(struct active_request_slot *slot,
 932                  struct slot_results *results)
 933 {
 934         slot->results = results;
 935         if (!start_active_slot(slot)) {
 936                 snprintf(curl_errorstr, sizeof(curl_errorstr),
 937                          "failed to start HTTP request");
 938                 return HTTP_START_FAILED;
 939         }
 940
 941         run_active_slot(slot);
 942         return handle_curl_result(results);
 943 }
 944
 945 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
 946 {
 947         char *ptr;
 948         CURLcode ret;
 949
 950         strbuf_reset(buf);
 951         ret = curl_easy_getinfo(curl, info, &ptr);
 952         if (!ret && ptr)
 953                 strbuf_addstr(buf, ptr);
 954         return ret;
 955 }
 956
 957 /*
 958  * Check for and extract a content-type parameter. "raw"
 959  * should be positioned at the start of the potential
 960  * parameter, with any whitespace already removed.
 961  *
 962  * "name" is the name of the parameter. The value is appended
 963  * to "out".
 964  */
 965 static int extract_param(const char *raw, const char *name,
 966                          struct strbuf *out)
 967 {
 968         size_t len = strlen(name);
 969
 970         if (strncasecmp(raw, name, len))
 971                 return -1;
 972         raw += len;
 973
 974         if (*raw != '=')
 975                 return -1;
 976         raw++;
 977
 978         while (*raw && !isspace(*raw) && *raw != ';')
 979                 strbuf_addch(out, *raw++);
 980         return 0;
 981 }
 982
 983 /*
 984  * Extract a normalized version of the content type, with any
 985  * spaces suppressed, all letters lowercased, and no trailing ";"
 986  * or parameters.
 987  *
 988  * Note that we will silently remove even invalid whitespace. For
 989  * example, "text / plain" is specifically forbidden by RFC 2616,
 990  * but "text/plain" is the only reasonable output, and this keeps
 991  * our code simple.
 992  *
 993  * If the "charset" argument is not NULL, store the value of any
 994  * charset parameter there.
 995  *
 996  * Example:
 997  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
 998  *   "text / plain" -> "text/plain"
 999  */
1000 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1001                                  struct strbuf *charset)
1002 {
1003         const char *p;
1004
1005         strbuf_reset(type);
1006         strbuf_grow(type, raw->len);
1007         for (p = raw->buf; *p; p++) {
1008                 if (isspace(*p))
1009                         continue;
1010                 if (*p == ';') {
1011                         p++;
1012                         break;
1013                 }
1014                 strbuf_addch(type, tolower(*p));
1015         }
1016
1017         if (!charset)
1018                 return;
1019
1020         strbuf_reset(charset);
1021         while (*p) {
1022                 while (isspace(*p) || *p == ';')
1023                         p++;
1024                 if (!extract_param(p, "charset", charset))
1025                         return;
1026                 while (*p && !isspace(*p))
1027                         p++;
1028         }
1029
1030         if (!charset->len && starts_with(type->buf, "text/"))
1031                 strbuf_addstr(charset, "ISO-8859-1");
1032 }
1033
1034 static void write_accept_language(struct strbuf *buf)
1035 {
1036         /*
1037          * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1038          * that, q-value will be smaller than 0.001, the minimum q-value the
1039          * HTTP specification allows. See
1040          * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1041          */
1042         const int MAX_DECIMAL_PLACES = 3;
1043         const int MAX_LANGUAGE_TAGS = 1000;
1044         const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1045         char **language_tags = NULL;
1046         int num_langs = 0;
1047         const char *s = get_preferred_languages();
1048         int i;
1049         struct strbuf tag = STRBUF_INIT;
1050
1051         /* Don't add Accept-Language header if no language is preferred. */
1052         if (!s)
1053                 return;
1054
1055         /*
1056          * Split the colon-separated string of preferred languages into
1057          * language_tags array.
1058          */
1059         do {
1060                 /* collect language tag */
1061                 for (; *s && (isalnum(*s) || *s == '_'); s++)
1062                         strbuf_addch(&tag, *s == '_' ? '-' : *s);
1063
1064                 /* skip .codeset, @modifier and any other unnecessary parts */
1065                 while (*s && *s != ':')
1066                         s++;
1067
1068                 if (tag.len) {
1069                         num_langs++;
1070                         REALLOC_ARRAY(language_tags, num_langs);
1071                         language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1072                         if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1073                                 break;
1074                 }
1075         } while (*s++);
1076
1077         /* write Accept-Language header into buf */
1078         if (num_langs) {
1079                 int last_buf_len = 0;
1080                 int max_q;
1081                 int decimal_places;
1082                 char q_format[32];
1083
1084                 /* add '*' */
1085                 REALLOC_ARRAY(language_tags, num_langs + 1);
1086                 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1087
1088                 /* compute decimal_places */
1089                 for (max_q = 1, decimal_places = 0;
1090                      max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1091                      decimal_places++, max_q *= 10)
1092                         ;
1093
1094                 sprintf(q_format, ";q=0.%%0%dd", decimal_places);
1095
1096                 strbuf_addstr(buf, "Accept-Language: ");
1097
1098                 for (i = 0; i < num_langs; i++) {
1099                         if (i > 0)
1100                                 strbuf_addstr(buf, ", ");
1101
1102                         strbuf_addstr(buf, language_tags[i]);
1103
1104                         if (i > 0)
1105                                 strbuf_addf(buf, q_format, max_q - i);
1106
1107                         if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1108                                 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1109                                 break;
1110                         }
1111
1112                         last_buf_len = buf->len;
1113                 }
1114         }
1115
1116         /* free language tags -- last one is a static '*' */
1117         for (i = 0; i < num_langs - 1; i++)
1118                 free(language_tags[i]);
1119         free(language_tags);
1120 }
1121
1122 /*
1123  * Get an Accept-Language header which indicates user's preferred languages.
1124  *
1125  * Examples:
1126  *   LANGUAGE= -> ""
1127  *   LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1128  *   LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1129  *   LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1130  *   LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1131  *   LANGUAGE= LANG=C -> ""
1132  */
1133 static const char *get_accept_language(void)
1134 {
1135         if (!cached_accept_language) {
1136                 struct strbuf buf = STRBUF_INIT;
1137                 write_accept_language(&buf);
1138                 if (buf.len > 0)
1139                         cached_accept_language = strbuf_detach(&buf, NULL);
1140         }
1141
1142         return cached_accept_language;
1143 }
1144
1145 /* http_request() targets */
1146 #define HTTP_REQUEST_STRBUF     0
1147 #define HTTP_REQUEST_FILE       1
1148
1149 static int http_request(const char *url,
1150                         void *result, int target,
1151                         const struct http_get_options *options)
1152 {
1153         struct active_request_slot *slot;
1154         struct slot_results results;
1155         struct curl_slist *headers = NULL;
1156         struct strbuf buf = STRBUF_INIT;
1157         const char *accept_language;
1158         int ret;
1159
1160         slot = get_active_slot();
1161         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1162
1163         if (result == NULL) {
1164                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1165         } else {
1166                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1167                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1168
1169                 if (target == HTTP_REQUEST_FILE) {
1170                         long posn = ftell(result);
1171                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1172                                          fwrite);
1173                         if (posn > 0) {
1174                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1175                                 headers = curl_slist_append(headers, buf.buf);
1176                                 strbuf_reset(&buf);
1177                         }
1178                 } else
1179                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1180                                          fwrite_buffer);
1181         }
1182
1183         accept_language = get_accept_language();
1184
1185         if (accept_language)
1186                 headers = curl_slist_append(headers, accept_language);
1187
1188         strbuf_addstr(&buf, "Pragma:");
1189         if (options && options->no_cache)
1190                 strbuf_addstr(&buf, " no-cache");
1191         if (options && options->keep_error)
1192                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1193
1194         headers = curl_slist_append(headers, buf.buf);
1195
1196         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1197         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1198         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1199
1200         ret = run_one_slot(slot, &results);
1201
1202         if (options && options->content_type) {
1203                 struct strbuf raw = STRBUF_INIT;
1204                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1205                 extract_content_type(&raw, options->content_type,
1206                                      options->charset);
1207                 strbuf_release(&raw);
1208         }
1209
1210         if (options && options->effective_url)
1211                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1212                                 options->effective_url);
1213
1214         curl_slist_free_all(headers);
1215         strbuf_release(&buf);
1216
1217         return ret;
1218 }
1219
1220 /*
1221  * Update the "base" url to a more appropriate value, as deduced by
1222  * redirects seen when requesting a URL starting with "url".
1223  *
1224  * The "asked" parameter is a URL that we asked curl to access, and must begin
1225  * with "base".
1226  *
1227  * The "got" parameter is the URL that curl reported to us as where we ended
1228  * up.
1229  *
1230  * Returns 1 if we updated the base url, 0 otherwise.
1231  *
1232  * Our basic strategy is to compare "base" and "asked" to find the bits
1233  * specific to our request. We then strip those bits off of "got" to yield the
1234  * new base. So for example, if our base is "http://example.com/foo.git",
1235  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1236  * with "https://other.example.com/foo.git/info/refs". We would want the
1237  * new URL to become "https://other.example.com/foo.git".
1238  *
1239  * Note that this assumes a sane redirect scheme. It's entirely possible
1240  * in the example above to end up at a URL that does not even end in
1241  * "info/refs".  In such a case we simply punt, as there is not much we can
1242  * do (and such a scheme is unlikely to represent a real git repository,
1243  * which means we are likely about to abort anyway).
1244  */
1245 static int update_url_from_redirect(struct strbuf *base,
1246                                     const char *asked,
1247                                     const struct strbuf *got)
1248 {
1249         const char *tail;
1250         size_t tail_len;
1251
1252         if (!strcmp(asked, got->buf))
1253                 return 0;
1254
1255         if (!skip_prefix(asked, base->buf, &tail))
1256                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1257                     asked, base->buf);
1258
1259         tail_len = strlen(tail);
1260
1261         if (got->len < tail_len ||
1262             strcmp(tail, got->buf + got->len - tail_len))
1263                 return 0; /* insane redirect scheme */
1264
1265         strbuf_reset(base);
1266         strbuf_add(base, got->buf, got->len - tail_len);
1267         return 1;
1268 }
1269
1270 static int http_request_reauth(const char *url,
1271                                void *result, int target,
1272                                struct http_get_options *options)
1273 {
1274         int ret = http_request(url, result, target, options);
1275
1276         if (options && options->effective_url && options->base_url) {
1277                 if (update_url_from_redirect(options->base_url,
1278                                              url, options->effective_url)) {
1279                         credential_from_url(&http_auth, options->base_url->buf);
1280                         url = options->effective_url->buf;
1281                 }
1282         }
1283
1284         if (ret != HTTP_REAUTH)
1285                 return ret;
1286
1287         /*
1288          * If we are using KEEP_ERROR, the previous request may have
1289          * put cruft into our output stream; we should clear it out before
1290          * making our next request. We only know how to do this for
1291          * the strbuf case, but that is enough to satisfy current callers.
1292          */
1293         if (options && options->keep_error) {
1294                 switch (target) {
1295                 case HTTP_REQUEST_STRBUF:
1296                         strbuf_reset(result);
1297                         break;
1298                 default:
1299                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1300                 }
1301         }
1302
1303         credential_fill(&http_auth);
1304
1305         return http_request(url, result, target, options);
1306 }
1307
1308 int http_get_strbuf(const char *url,
1309                     struct strbuf *result,
1310                     struct http_get_options *options)
1311 {
1312         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1313 }
1314
1315 /*
1316  * Downloads a URL and stores the result in the given file.
1317  *
1318  * If a previous interrupted download is detected (i.e. a previous temporary
1319  * file is still around) the download is resumed.
1320  */
1321 static int http_get_file(const char *url, const char *filename,
1322                          struct http_get_options *options)
1323 {
1324         int ret;
1325         struct strbuf tmpfile = STRBUF_INIT;
1326         FILE *result;
1327
1328         strbuf_addf(&tmpfile, "%s.temp", filename);
1329         result = fopen(tmpfile.buf, "a");
1330         if (!result) {
1331                 error("Unable to open local file %s", tmpfile.buf);
1332                 ret = HTTP_ERROR;
1333                 goto cleanup;
1334         }
1335
1336         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1337         fclose(result);
1338
1339         if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1340                 ret = HTTP_ERROR;
1341 cleanup:
1342         strbuf_release(&tmpfile);
1343         return ret;
1344 }
1345
1346 int http_fetch_ref(const char *base, struct ref *ref)
1347 {
1348         struct http_get_options options = {0};
1349         char *url;
1350         struct strbuf buffer = STRBUF_INIT;
1351         int ret = -1;
1352
1353         options.no_cache = 1;
1354
1355         url = quote_ref_url(base, ref->name);
1356         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1357                 strbuf_rtrim(&buffer);
1358                 if (buffer.len == 40)
1359                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1360                 else if (starts_with(buffer.buf, "ref: ")) {
1361                         ref->symref = xstrdup(buffer.buf + 5);
1362                         ret = 0;
1363                 }
1364         }
1365
1366         strbuf_release(&buffer);
1367         free(url);
1368         return ret;
1369 }
1370
1371 /* Helpers for fetching packs */
1372 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1373 {
1374         char *url, *tmp;
1375         struct strbuf buf = STRBUF_INIT;
1376
1377         if (http_is_verbose)
1378                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1379
1380         end_url_with_slash(&buf, base_url);
1381         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1382         url = strbuf_detach(&buf, NULL);
1383
1384         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1385         tmp = strbuf_detach(&buf, NULL);
1386
1387         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1388                 error("Unable to get pack index %s", url);
1389                 free(tmp);
1390                 tmp = NULL;
1391         }
1392
1393         free(url);
1394         return tmp;
1395 }
1396
1397 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1398         unsigned char *sha1, const char *base_url)
1399 {
1400         struct packed_git *new_pack;
1401         char *tmp_idx = NULL;
1402         int ret;
1403
1404         if (has_pack_index(sha1)) {
1405                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1406                 if (!new_pack)
1407                         return -1; /* parse_pack_index() already issued error message */
1408                 goto add_pack;
1409         }
1410
1411         tmp_idx = fetch_pack_index(sha1, base_url);
1412         if (!tmp_idx)
1413                 return -1;
1414
1415         new_pack = parse_pack_index(sha1, tmp_idx);
1416         if (!new_pack) {
1417                 unlink(tmp_idx);
1418                 free(tmp_idx);
1419
1420                 return -1; /* parse_pack_index() already issued error message */
1421         }
1422
1423         ret = verify_pack_index(new_pack);
1424         if (!ret) {
1425                 close_pack_index(new_pack);
1426                 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1427         }
1428         free(tmp_idx);
1429         if (ret)
1430                 return -1;
1431
1432 add_pack:
1433         new_pack->next = *packs_head;
1434         *packs_head = new_pack;
1435         return 0;
1436 }
1437
1438 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1439 {
1440         struct http_get_options options = {0};
1441         int ret = 0, i = 0;
1442         char *url, *data;
1443         struct strbuf buf = STRBUF_INIT;
1444         unsigned char sha1[20];
1445
1446         end_url_with_slash(&buf, base_url);
1447         strbuf_addstr(&buf, "objects/info/packs");
1448         url = strbuf_detach(&buf, NULL);
1449
1450         options.no_cache = 1;
1451         ret = http_get_strbuf(url, &buf, &options);
1452         if (ret != HTTP_OK)
1453                 goto cleanup;
1454
1455         data = buf.buf;
1456         while (i < buf.len) {
1457                 switch (data[i]) {
1458                 case 'P':
1459                         i++;
1460                         if (i + 52 <= buf.len &&
1461                             starts_with(data + i, " pack-") &&
1462                             starts_with(data + i + 46, ".pack\n")) {
1463                                 get_sha1_hex(data + i + 6, sha1);
1464                                 fetch_and_setup_pack_index(packs_head, sha1,
1465                                                       base_url);
1466                                 i += 51;
1467                                 break;
1468                         }
1469                 default:
1470                         while (i < buf.len && data[i] != '\n')
1471                                 i++;
1472                 }
1473                 i++;
1474         }
1475
1476 cleanup:
1477         free(url);
1478         return ret;
1479 }
1480
1481 void release_http_pack_request(struct http_pack_request *preq)
1482 {
1483         if (preq->packfile != NULL) {
1484                 fclose(preq->packfile);
1485                 preq->packfile = NULL;
1486         }
1487         if (preq->range_header != NULL) {
1488                 curl_slist_free_all(preq->range_header);
1489                 preq->range_header = NULL;
1490         }
1491         preq->slot = NULL;
1492         free(preq->url);
1493         free(preq);
1494 }
1495
1496 int finish_http_pack_request(struct http_pack_request *preq)
1497 {
1498         struct packed_git **lst;
1499         struct packed_git *p = preq->target;
1500         char *tmp_idx;
1501         struct child_process ip = CHILD_PROCESS_INIT;
1502         const char *ip_argv[8];
1503
1504         close_pack_index(p);
1505
1506         fclose(preq->packfile);
1507         preq->packfile = NULL;
1508
1509         lst = preq->lst;
1510         while (*lst != p)
1511                 lst = &((*lst)->next);
1512         *lst = (*lst)->next;
1513
1514         tmp_idx = xstrdup(preq->tmpfile);
1515         strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1516                ".idx.temp");
1517
1518         ip_argv[0] = "index-pack";
1519         ip_argv[1] = "-o";
1520         ip_argv[2] = tmp_idx;
1521         ip_argv[3] = preq->tmpfile;
1522         ip_argv[4] = NULL;
1523
1524         ip.argv = ip_argv;
1525         ip.git_cmd = 1;
1526         ip.no_stdin = 1;
1527         ip.no_stdout = 1;
1528
1529         if (run_command(&ip)) {
1530                 unlink(preq->tmpfile);
1531                 unlink(tmp_idx);
1532                 free(tmp_idx);
1533                 return -1;
1534         }
1535
1536         unlink(sha1_pack_index_name(p->sha1));
1537
1538         if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1539          || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1540                 free(tmp_idx);
1541                 return -1;
1542         }
1543
1544         install_packed_git(p);
1545         free(tmp_idx);
1546         return 0;
1547 }
1548
1549 struct http_pack_request *new_http_pack_request(
1550         struct packed_git *target, const char *base_url)
1551 {
1552         long prev_posn = 0;
1553         char range[RANGE_HEADER_SIZE];
1554         struct strbuf buf = STRBUF_INIT;
1555         struct http_pack_request *preq;
1556
1557         preq = xcalloc(1, sizeof(*preq));
1558         preq->target = target;
1559
1560         end_url_with_slash(&buf, base_url);
1561         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1562                 sha1_to_hex(target->sha1));
1563         preq->url = strbuf_detach(&buf, NULL);
1564
1565         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1566                 sha1_pack_name(target->sha1));
1567         preq->packfile = fopen(preq->tmpfile, "a");
1568         if (!preq->packfile) {
1569                 error("Unable to open local file %s for pack",
1570                       preq->tmpfile);
1571                 goto abort;
1572         }
1573
1574         preq->slot = get_active_slot();
1575         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1576         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1577         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1578         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1579                 no_pragma_header);
1580
1581         /*
1582          * If there is data present from a previous transfer attempt,
1583          * resume where it left off
1584          */
1585         prev_posn = ftell(preq->packfile);
1586         if (prev_posn>0) {
1587                 if (http_is_verbose)
1588                         fprintf(stderr,
1589                                 "Resuming fetch of pack %s at byte %ld\n",
1590                                 sha1_to_hex(target->sha1), prev_posn);
1591                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1592                 preq->range_header = curl_slist_append(NULL, range);
1593                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1594                         preq->range_header);
1595         }
1596
1597         return preq;
1598
1599 abort:
1600         free(preq->url);
1601         free(preq);
1602         return NULL;
1603 }
1604
1605 /* Helpers for fetching objects (loose) */
1606 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1607                                void *data)
1608 {
1609         unsigned char expn[4096];
1610         size_t size = eltsize * nmemb;
1611         int posn = 0;
1612         struct http_object_request *freq =
1613                 (struct http_object_request *)data;
1614         do {
1615                 ssize_t retval = xwrite(freq->localfile,
1616                                         (char *) ptr + posn, size - posn);
1617                 if (retval < 0)
1618                         return posn;
1619                 posn += retval;
1620         } while (posn < size);
1621
1622         freq->stream.avail_in = size;
1623         freq->stream.next_in = (void *)ptr;
1624         do {
1625                 freq->stream.next_out = expn;
1626                 freq->stream.avail_out = sizeof(expn);
1627                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1628                 git_SHA1_Update(&freq->c, expn,
1629                                 sizeof(expn) - freq->stream.avail_out);
1630         } while (freq->stream.avail_in && freq->zret == Z_OK);
1631         return size;
1632 }
1633
1634 struct http_object_request *new_http_object_request(const char *base_url,
1635         unsigned char *sha1)
1636 {
1637         char *hex = sha1_to_hex(sha1);
1638         const char *filename;
1639         char prevfile[PATH_MAX];
1640         int prevlocal;
1641         char prev_buf[PREV_BUF_SIZE];
1642         ssize_t prev_read = 0;
1643         long prev_posn = 0;
1644         char range[RANGE_HEADER_SIZE];
1645         struct curl_slist *range_header = NULL;
1646         struct http_object_request *freq;
1647
1648         freq = xcalloc(1, sizeof(*freq));
1649         hashcpy(freq->sha1, sha1);
1650         freq->localfile = -1;
1651
1652         filename = sha1_file_name(sha1);
1653         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1654                  "%s.temp", filename);
1655
1656         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1657         unlink_or_warn(prevfile);
1658         rename(freq->tmpfile, prevfile);
1659         unlink_or_warn(freq->tmpfile);
1660
1661         if (freq->localfile != -1)
1662                 error("fd leakage in start: %d", freq->localfile);
1663         freq->localfile = open(freq->tmpfile,
1664                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1665         /*
1666          * This could have failed due to the "lazy directory creation";
1667          * try to mkdir the last path component.
1668          */
1669         if (freq->localfile < 0 && errno == ENOENT) {
1670                 char *dir = strrchr(freq->tmpfile, '/');
1671                 if (dir) {
1672                         *dir = 0;
1673                         mkdir(freq->tmpfile, 0777);
1674                         *dir = '/';
1675                 }
1676                 freq->localfile = open(freq->tmpfile,
1677                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1678         }
1679
1680         if (freq->localfile < 0) {
1681                 error("Couldn't create temporary file %s: %s",
1682                       freq->tmpfile, strerror(errno));
1683                 goto abort;
1684         }
1685
1686         git_inflate_init(&freq->stream);
1687
1688         git_SHA1_Init(&freq->c);
1689
1690         freq->url = get_remote_object_url(base_url, hex, 0);
1691
1692         /*
1693          * If a previous temp file is present, process what was already
1694          * fetched.
1695          */
1696         prevlocal = open(prevfile, O_RDONLY);
1697         if (prevlocal != -1) {
1698                 do {
1699                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1700                         if (prev_read>0) {
1701                                 if (fwrite_sha1_file(prev_buf,
1702                                                      1,
1703                                                      prev_read,
1704                                                      freq) == prev_read) {
1705                                         prev_posn += prev_read;
1706                                 } else {
1707                                         prev_read = -1;
1708                                 }
1709                         }
1710                 } while (prev_read > 0);
1711                 close(prevlocal);
1712         }
1713         unlink_or_warn(prevfile);
1714
1715         /*
1716          * Reset inflate/SHA1 if there was an error reading the previous temp
1717          * file; also rewind to the beginning of the local file.
1718          */
1719         if (prev_read == -1) {
1720                 memset(&freq->stream, 0, sizeof(freq->stream));
1721                 git_inflate_init(&freq->stream);
1722                 git_SHA1_Init(&freq->c);
1723                 if (prev_posn>0) {
1724                         prev_posn = 0;
1725                         lseek(freq->localfile, 0, SEEK_SET);
1726                         if (ftruncate(freq->localfile, 0) < 0) {
1727                                 error("Couldn't truncate temporary file %s: %s",
1728                                           freq->tmpfile, strerror(errno));
1729                                 goto abort;
1730                         }
1731                 }
1732         }
1733
1734         freq->slot = get_active_slot();
1735
1736         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1737         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1738         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1739         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1740         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1741
1742         /*
1743          * If we have successfully processed data from a previous fetch
1744          * attempt, only fetch the data we don't already have.
1745          */
1746         if (prev_posn>0) {
1747                 if (http_is_verbose)
1748                         fprintf(stderr,
1749                                 "Resuming fetch of object %s at byte %ld\n",
1750                                 hex, prev_posn);
1751                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1752                 range_header = curl_slist_append(range_header, range);
1753                 curl_easy_setopt(freq->slot->curl,
1754                                  CURLOPT_HTTPHEADER, range_header);
1755         }
1756
1757         return freq;
1758
1759 abort:
1760         free(freq->url);
1761         free(freq);
1762         return NULL;
1763 }
1764
1765 void process_http_object_request(struct http_object_request *freq)
1766 {
1767         if (freq->slot == NULL)
1768                 return;
1769         freq->curl_result = freq->slot->curl_result;
1770         freq->http_code = freq->slot->http_code;
1771         freq->slot = NULL;
1772 }
1773
1774 int finish_http_object_request(struct http_object_request *freq)
1775 {
1776         struct stat st;
1777
1778         close(freq->localfile);
1779         freq->localfile = -1;
1780
1781         process_http_object_request(freq);
1782
1783         if (freq->http_code == 416) {
1784                 warning("requested range invalid; we may already have all the data.");
1785         } else if (freq->curl_result != CURLE_OK) {
1786                 if (stat(freq->tmpfile, &st) == 0)
1787                         if (st.st_size == 0)
1788                                 unlink_or_warn(freq->tmpfile);
1789                 return -1;
1790         }
1791
1792         git_inflate_end(&freq->stream);
1793         git_SHA1_Final(freq->real_sha1, &freq->c);
1794         if (freq->zret != Z_STREAM_END) {
1795                 unlink_or_warn(freq->tmpfile);
1796                 return -1;
1797         }
1798         if (hashcmp(freq->sha1, freq->real_sha1)) {
1799                 unlink_or_warn(freq->tmpfile);
1800                 return -1;
1801         }
1802         freq->rename =
1803                 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1804
1805         return freq->rename;
1806 }
1807
1808 void abort_http_object_request(struct http_object_request *freq)
1809 {
1810         unlink_or_warn(freq->tmpfile);
1811
1812         release_http_object_request(freq);
1813 }
1814
1815 void release_http_object_request(struct http_object_request *freq)
1816 {
1817         if (freq->localfile != -1) {
1818                 close(freq->localfile);
1819                 freq->localfile = -1;
1820         }
1821         if (freq->url != NULL) {
1822                 free(freq->url);
1823                 freq->url = NULL;
1824         }
1825         if (freq->slot != NULL) {
1826                 freq->slot->callback_func = NULL;
1827                 freq->slot->callback_data = NULL;
1828                 release_active_slot(freq->slot);
1829                 freq->slot = NULL;
1830         }
1831 }