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