http.c

   1 #include "http.h"
   2 #include "pack.h"
   3 #include "sideband.h"
   4 #include "run-command.h"
   5 #include "url.h"
   6 #include "credential.h"
   7
   8 int active_requests;
   9 int http_is_verbose;
  10 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  11
  12 #if LIBCURL_VERSION_NUM >= 0x070a06
  13 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  14 #endif
  15
  16 static int min_curl_sessions = 1;
  17 static int curl_session_count;
  18 #ifdef USE_CURL_MULTI
  19 static int max_requests = -1;
  20 static CURLM *curlm;
  21 #endif
  22 #ifndef NO_CURL_EASY_DUPHANDLE
  23 static CURL *curl_default;
  24 #endif
  25
  26 #define PREV_BUF_SIZE 4096
  27 #define RANGE_HEADER_SIZE 30
  28
  29 char curl_errorstr[CURL_ERROR_SIZE];
  30
  31 static int curl_ssl_verify = -1;
  32 static const char *ssl_cert;
  33 #if LIBCURL_VERSION_NUM >= 0x070903
  34 static const char *ssl_key;
  35 #endif
  36 #if LIBCURL_VERSION_NUM >= 0x070908
  37 static const char *ssl_capath;
  38 #endif
  39 static const char *ssl_cainfo;
  40 static long curl_low_speed_limit = -1;
  41 static long curl_low_speed_time = -1;
  42 static int curl_ftp_no_epsv;
  43 static const char *curl_http_proxy;
  44 static const char *curl_cookie_file;
  45 static struct credential http_auth = CREDENTIAL_INIT;
  46 static int http_proactive_auth;
  47 static const char *user_agent;
  48
  49 #if LIBCURL_VERSION_NUM >= 0x071700
  50 /* Use CURLOPT_KEYPASSWD as is */
  51 #elif LIBCURL_VERSION_NUM >= 0x070903
  52 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  53 #else
  54 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  55 #endif
  56
  57 static struct credential cert_auth = CREDENTIAL_INIT;
  58 static int ssl_cert_password_required;
  59
  60 static struct curl_slist *pragma_header;
  61 static struct curl_slist *no_pragma_header;
  62
  63 static struct active_request_slot *active_queue_head;
  64
  65 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  66 {
  67         size_t size = eltsize * nmemb;
  68         struct buffer *buffer = buffer_;
  69
  70         if (size > buffer->buf.len - buffer->posn)
  71                 size = buffer->buf.len - buffer->posn;
  72         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  73         buffer->posn += size;
  74
  75         return size;
  76 }
  77
  78 #ifndef NO_CURL_IOCTL
  79 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  80 {
  81         struct buffer *buffer = clientp;
  82
  83         switch (cmd) {
  84         case CURLIOCMD_NOP:
  85                 return CURLIOE_OK;
  86
  87         case CURLIOCMD_RESTARTREAD:
  88                 buffer->posn = 0;
  89                 return CURLIOE_OK;
  90
  91         default:
  92                 return CURLIOE_UNKNOWNCMD;
  93         }
  94 }
  95 #endif
  96
  97 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  98 {
  99         size_t size = eltsize * nmemb;
 100         struct strbuf *buffer = buffer_;
 101
 102         strbuf_add(buffer, ptr, size);
 103         return size;
 104 }
 105
 106 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 107 {
 108         return eltsize * nmemb;
 109 }
 110
 111 #ifdef USE_CURL_MULTI
 112 static void process_curl_messages(void)
 113 {
 114         int num_messages;
 115         struct active_request_slot *slot;
 116         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 117
 118         while (curl_message != NULL) {
 119                 if (curl_message->msg == CURLMSG_DONE) {
 120                         int curl_result = curl_message->data.result;
 121                         slot = active_queue_head;
 122                         while (slot != NULL &&
 123                                slot->curl != curl_message->easy_handle)
 124                                 slot = slot->next;
 125                         if (slot != NULL) {
 126                                 curl_multi_remove_handle(curlm, slot->curl);
 127                                 slot->curl_result = curl_result;
 128                                 finish_active_slot(slot);
 129                         } else {
 130                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 131                         }
 132                 } else {
 133                         fprintf(stderr, "Unknown CURL message received: %d\n",
 134                                 (int)curl_message->msg);
 135                 }
 136                 curl_message = curl_multi_info_read(curlm, &num_messages);
 137         }
 138 }
 139 #endif
 140
 141 static int http_options(const char *var, const char *value, void *cb)
 142 {
 143         if (!strcmp("http.sslverify", var)) {
 144                 curl_ssl_verify = git_config_bool(var, value);
 145                 return 0;
 146         }
 147         if (!strcmp("http.sslcert", var))
 148                 return git_config_string(&ssl_cert, var, value);
 149 #if LIBCURL_VERSION_NUM >= 0x070903
 150         if (!strcmp("http.sslkey", var))
 151                 return git_config_string(&ssl_key, var, value);
 152 #endif
 153 #if LIBCURL_VERSION_NUM >= 0x070908
 154         if (!strcmp("http.sslcapath", var))
 155                 return git_config_string(&ssl_capath, var, value);
 156 #endif
 157         if (!strcmp("http.sslcainfo", var))
 158                 return git_config_string(&ssl_cainfo, var, value);
 159         if (!strcmp("http.sslcertpasswordprotected", var)) {
 160                 if (git_config_bool(var, value))
 161                         ssl_cert_password_required = 1;
 162                 return 0;
 163         }
 164         if (!strcmp("http.minsessions", var)) {
 165                 min_curl_sessions = git_config_int(var, value);
 166 #ifndef USE_CURL_MULTI
 167                 if (min_curl_sessions > 1)
 168                         min_curl_sessions = 1;
 169 #endif
 170                 return 0;
 171         }
 172 #ifdef USE_CURL_MULTI
 173         if (!strcmp("http.maxrequests", var)) {
 174                 max_requests = git_config_int(var, value);
 175                 return 0;
 176         }
 177 #endif
 178         if (!strcmp("http.lowspeedlimit", var)) {
 179                 curl_low_speed_limit = (long)git_config_int(var, value);
 180                 return 0;
 181         }
 182         if (!strcmp("http.lowspeedtime", var)) {
 183                 curl_low_speed_time = (long)git_config_int(var, value);
 184                 return 0;
 185         }
 186
 187         if (!strcmp("http.noepsv", var)) {
 188                 curl_ftp_no_epsv = git_config_bool(var, value);
 189                 return 0;
 190         }
 191         if (!strcmp("http.proxy", var))
 192                 return git_config_string(&curl_http_proxy, var, value);
 193
 194         if (!strcmp("http.cookiefile", var))
 195                 return git_config_string(&curl_cookie_file, var, value);
 196
 197         if (!strcmp("http.postbuffer", var)) {
 198                 http_post_buffer = git_config_int(var, value);
 199                 if (http_post_buffer < LARGE_PACKET_MAX)
 200                         http_post_buffer = LARGE_PACKET_MAX;
 201                 return 0;
 202         }
 203
 204         if (!strcmp("http.useragent", var))
 205                 return git_config_string(&user_agent, var, value);
 206
 207         /* Fall back on the default ones */
 208         return git_default_config(var, value, cb);
 209 }
 210
 211 static void init_curl_http_auth(CURL *result)
 212 {
 213         if (http_auth.username) {
 214                 struct strbuf up = STRBUF_INIT;
 215                 credential_fill(&http_auth);
 216                 strbuf_addf(&up, "%s:%s",
 217                             http_auth.username, http_auth.password);
 218                 curl_easy_setopt(result, CURLOPT_USERPWD,
 219                                  strbuf_detach(&up, NULL));
 220         }
 221 }
 222
 223 static int has_cert_password(void)
 224 {
 225         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 226                 return 0;
 227         if (!cert_auth.password) {
 228                 cert_auth.protocol = xstrdup("cert");
 229                 cert_auth.path = xstrdup(ssl_cert);
 230                 credential_fill(&cert_auth);
 231         }
 232         return 1;
 233 }
 234
 235 static CURL *get_curl_handle(void)
 236 {
 237         CURL *result = curl_easy_init();
 238
 239         if (!curl_ssl_verify) {
 240                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 241                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 242         } else {
 243                 /* Verify authenticity of the peer's certificate */
 244                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 245                 /* The name in the cert must match whom we tried to connect */
 246                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 247         }
 248
 249 #if LIBCURL_VERSION_NUM >= 0x070907
 250         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 251 #endif
 252 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 253         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 254 #endif
 255
 256         if (http_proactive_auth)
 257                 init_curl_http_auth(result);
 258
 259         if (ssl_cert != NULL)
 260                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 261         if (has_cert_password())
 262                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 263 #if LIBCURL_VERSION_NUM >= 0x070903
 264         if (ssl_key != NULL)
 265                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 266 #endif
 267 #if LIBCURL_VERSION_NUM >= 0x070908
 268         if (ssl_capath != NULL)
 269                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 270 #endif
 271         if (ssl_cainfo != NULL)
 272                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 273         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 274
 275         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 276                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 277                                  curl_low_speed_limit);
 278                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 279                                  curl_low_speed_time);
 280         }
 281
 282         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 283 #if LIBCURL_VERSION_NUM >= 0x071301
 284         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 285 #elif LIBCURL_VERSION_NUM >= 0x071101
 286         curl_easy_setopt(result, CURLOPT_POST301, 1);
 287 #endif
 288
 289         if (getenv("GIT_CURL_VERBOSE"))
 290                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 291
 292         curl_easy_setopt(result, CURLOPT_USERAGENT,
 293                 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
 294
 295         if (curl_ftp_no_epsv)
 296                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 297
 298         if (curl_http_proxy) {
 299                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 300                 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 301         }
 302
 303         return result;
 304 }
 305
 306 static void set_from_env(const char **var, const char *envname)
 307 {
 308         const char *val = getenv(envname);
 309         if (val)
 310                 *var = val;
 311 }
 312
 313 void http_init(struct remote *remote, const char *url, int proactive_auth)
 314 {
 315         char *low_speed_limit;
 316         char *low_speed_time;
 317
 318         http_is_verbose = 0;
 319
 320         git_config(http_options, NULL);
 321
 322         curl_global_init(CURL_GLOBAL_ALL);
 323
 324         http_proactive_auth = proactive_auth;
 325
 326         if (remote && remote->http_proxy)
 327                 curl_http_proxy = xstrdup(remote->http_proxy);
 328
 329         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 330         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 331
 332 #ifdef USE_CURL_MULTI
 333         {
 334                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 335                 if (http_max_requests != NULL)
 336                         max_requests = atoi(http_max_requests);
 337         }
 338
 339         curlm = curl_multi_init();
 340         if (curlm == NULL) {
 341                 fprintf(stderr, "Error creating curl multi handle.\n");
 342                 exit(1);
 343         }
 344 #endif
 345
 346         if (getenv("GIT_SSL_NO_VERIFY"))
 347                 curl_ssl_verify = 0;
 348
 349         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 350 #if LIBCURL_VERSION_NUM >= 0x070903
 351         set_from_env(&ssl_key, "GIT_SSL_KEY");
 352 #endif
 353 #if LIBCURL_VERSION_NUM >= 0x070908
 354         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 355 #endif
 356         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 357
 358         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 359
 360         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 361         if (low_speed_limit != NULL)
 362                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 363         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 364         if (low_speed_time != NULL)
 365                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 366
 367         if (curl_ssl_verify == -1)
 368                 curl_ssl_verify = 1;
 369
 370         curl_session_count = 0;
 371 #ifdef USE_CURL_MULTI
 372         if (max_requests < 1)
 373                 max_requests = DEFAULT_MAX_REQUESTS;
 374 #endif
 375
 376         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 377                 curl_ftp_no_epsv = 1;
 378
 379         if (url) {
 380                 credential_from_url(&http_auth, url);
 381                 if (!ssl_cert_password_required &&
 382                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 383                     !prefixcmp(url, "https://"))
 384                         ssl_cert_password_required = 1;
 385         }
 386
 387 #ifndef NO_CURL_EASY_DUPHANDLE
 388         curl_default = get_curl_handle();
 389 #endif
 390 }
 391
 392 void http_cleanup(void)
 393 {
 394         struct active_request_slot *slot = active_queue_head;
 395
 396         while (slot != NULL) {
 397                 struct active_request_slot *next = slot->next;
 398                 if (slot->curl != NULL) {
 399 #ifdef USE_CURL_MULTI
 400                         curl_multi_remove_handle(curlm, slot->curl);
 401 #endif
 402                         curl_easy_cleanup(slot->curl);
 403                 }
 404                 free(slot);
 405                 slot = next;
 406         }
 407         active_queue_head = NULL;
 408
 409 #ifndef NO_CURL_EASY_DUPHANDLE
 410         curl_easy_cleanup(curl_default);
 411 #endif
 412
 413 #ifdef USE_CURL_MULTI
 414         curl_multi_cleanup(curlm);
 415 #endif
 416         curl_global_cleanup();
 417
 418         curl_slist_free_all(pragma_header);
 419         pragma_header = NULL;
 420
 421         curl_slist_free_all(no_pragma_header);
 422         no_pragma_header = NULL;
 423
 424         if (curl_http_proxy) {
 425                 free((void *)curl_http_proxy);
 426                 curl_http_proxy = NULL;
 427         }
 428
 429         if (cert_auth.password != NULL) {
 430                 memset(cert_auth.password, 0, strlen(cert_auth.password));
 431                 free(cert_auth.password);
 432                 cert_auth.password = NULL;
 433         }
 434         ssl_cert_password_required = 0;
 435 }
 436
 437 struct active_request_slot *get_active_slot(void)
 438 {
 439         struct active_request_slot *slot = active_queue_head;
 440         struct active_request_slot *newslot;
 441
 442 #ifdef USE_CURL_MULTI
 443         int num_transfers;
 444
 445         /* Wait for a slot to open up if the queue is full */
 446         while (active_requests >= max_requests) {
 447                 curl_multi_perform(curlm, &num_transfers);
 448                 if (num_transfers < active_requests)
 449                         process_curl_messages();
 450         }
 451 #endif
 452
 453         while (slot != NULL && slot->in_use)
 454                 slot = slot->next;
 455
 456         if (slot == NULL) {
 457                 newslot = xmalloc(sizeof(*newslot));
 458                 newslot->curl = NULL;
 459                 newslot->in_use = 0;
 460                 newslot->next = NULL;
 461
 462                 slot = active_queue_head;
 463                 if (slot == NULL) {
 464                         active_queue_head = newslot;
 465                 } else {
 466                         while (slot->next != NULL)
 467                                 slot = slot->next;
 468                         slot->next = newslot;
 469                 }
 470                 slot = newslot;
 471         }
 472
 473         if (slot->curl == NULL) {
 474 #ifdef NO_CURL_EASY_DUPHANDLE
 475                 slot->curl = get_curl_handle();
 476 #else
 477                 slot->curl = curl_easy_duphandle(curl_default);
 478 #endif
 479                 curl_session_count++;
 480         }
 481
 482         active_requests++;
 483         slot->in_use = 1;
 484         slot->results = NULL;
 485         slot->finished = NULL;
 486         slot->callback_data = NULL;
 487         slot->callback_func = NULL;
 488         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 489         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 490         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 491         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 492         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 493         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 494         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 495         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 496         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 497
 498         return slot;
 499 }
 500
 501 int start_active_slot(struct active_request_slot *slot)
 502 {
 503 #ifdef USE_CURL_MULTI
 504         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 505         int num_transfers;
 506
 507         if (curlm_result != CURLM_OK &&
 508             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 509                 active_requests--;
 510                 slot->in_use = 0;
 511                 return 0;
 512         }
 513
 514         /*
 515          * We know there must be something to do, since we just added
 516          * something.
 517          */
 518         curl_multi_perform(curlm, &num_transfers);
 519 #endif
 520         return 1;
 521 }
 522
 523 #ifdef USE_CURL_MULTI
 524 struct fill_chain {
 525         void *data;
 526         int (*fill)(void *);
 527         struct fill_chain *next;
 528 };
 529
 530 static struct fill_chain *fill_cfg;
 531
 532 void add_fill_function(void *data, int (*fill)(void *))
 533 {
 534         struct fill_chain *new = xmalloc(sizeof(*new));
 535         struct fill_chain **linkp = &fill_cfg;
 536         new->data = data;
 537         new->fill = fill;
 538         new->next = NULL;
 539         while (*linkp)
 540                 linkp = &(*linkp)->next;
 541         *linkp = new;
 542 }
 543
 544 void fill_active_slots(void)
 545 {
 546         struct active_request_slot *slot = active_queue_head;
 547
 548         while (active_requests < max_requests) {
 549                 struct fill_chain *fill;
 550                 for (fill = fill_cfg; fill; fill = fill->next)
 551                         if (fill->fill(fill->data))
 552                                 break;
 553
 554                 if (!fill)
 555                         break;
 556         }
 557
 558         while (slot != NULL) {
 559                 if (!slot->in_use && slot->curl != NULL
 560                         && curl_session_count > min_curl_sessions) {
 561                         curl_easy_cleanup(slot->curl);
 562                         slot->curl = NULL;
 563                         curl_session_count--;
 564                 }
 565                 slot = slot->next;
 566         }
 567 }
 568
 569 void step_active_slots(void)
 570 {
 571         int num_transfers;
 572         CURLMcode curlm_result;
 573
 574         do {
 575                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 576         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 577         if (num_transfers < active_requests) {
 578                 process_curl_messages();
 579                 fill_active_slots();
 580         }
 581 }
 582 #endif
 583
 584 void run_active_slot(struct active_request_slot *slot)
 585 {
 586 #ifdef USE_CURL_MULTI
 587         fd_set readfds;
 588         fd_set writefds;
 589         fd_set excfds;
 590         int max_fd;
 591         struct timeval select_timeout;
 592         int finished = 0;
 593
 594         slot->finished = &finished;
 595         while (!finished) {
 596                 step_active_slots();
 597
 598                 if (slot->in_use) {
 599 #if LIBCURL_VERSION_NUM >= 0x070f04
 600                         long curl_timeout;
 601                         curl_multi_timeout(curlm, &curl_timeout);
 602                         if (curl_timeout == 0) {
 603                                 continue;
 604                         } else if (curl_timeout == -1) {
 605                                 select_timeout.tv_sec  = 0;
 606                                 select_timeout.tv_usec = 50000;
 607                         } else {
 608                                 select_timeout.tv_sec  =  curl_timeout / 1000;
 609                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 610                         }
 611 #else
 612                         select_timeout.tv_sec  = 0;
 613                         select_timeout.tv_usec = 50000;
 614 #endif
 615
 616                         max_fd = -1;
 617                         FD_ZERO(&readfds);
 618                         FD_ZERO(&writefds);
 619                         FD_ZERO(&excfds);
 620                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 621
 622                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 623                 }
 624         }
 625 #else
 626         while (slot->in_use) {
 627                 slot->curl_result = curl_easy_perform(slot->curl);
 628                 finish_active_slot(slot);
 629         }
 630 #endif
 631 }
 632
 633 static void closedown_active_slot(struct active_request_slot *slot)
 634 {
 635         active_requests--;
 636         slot->in_use = 0;
 637 }
 638
 639 static void release_active_slot(struct active_request_slot *slot)
 640 {
 641         closedown_active_slot(slot);
 642         if (slot->curl && curl_session_count > min_curl_sessions) {
 643 #ifdef USE_CURL_MULTI
 644                 curl_multi_remove_handle(curlm, slot->curl);
 645 #endif
 646                 curl_easy_cleanup(slot->curl);
 647                 slot->curl = NULL;
 648                 curl_session_count--;
 649         }
 650 #ifdef USE_CURL_MULTI
 651         fill_active_slots();
 652 #endif
 653 }
 654
 655 void finish_active_slot(struct active_request_slot *slot)
 656 {
 657         closedown_active_slot(slot);
 658         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 659
 660         if (slot->finished != NULL)
 661                 (*slot->finished) = 1;
 662
 663         /* Store slot results so they can be read after the slot is reused */
 664         if (slot->results != NULL) {
 665                 slot->results->curl_result = slot->curl_result;
 666                 slot->results->http_code = slot->http_code;
 667         }
 668
 669         /* Run callback if appropriate */
 670         if (slot->callback_func != NULL)
 671                 slot->callback_func(slot->callback_data);
 672 }
 673
 674 void finish_all_active_slots(void)
 675 {
 676         struct active_request_slot *slot = active_queue_head;
 677
 678         while (slot != NULL)
 679                 if (slot->in_use) {
 680                         run_active_slot(slot);
 681                         slot = active_queue_head;
 682                 } else {
 683                         slot = slot->next;
 684                 }
 685 }
 686
 687 /* Helpers for modifying and creating URLs */
 688 static inline int needs_quote(int ch)
 689 {
 690         if (((ch >= 'A') && (ch <= 'Z'))
 691                         || ((ch >= 'a') && (ch <= 'z'))
 692                         || ((ch >= '0') && (ch <= '9'))
 693                         || (ch == '/')
 694                         || (ch == '-')
 695                         || (ch == '.'))
 696                 return 0;
 697         return 1;
 698 }
 699
 700 static char *quote_ref_url(const char *base, const char *ref)
 701 {
 702         struct strbuf buf = STRBUF_INIT;
 703         const char *cp;
 704         int ch;
 705
 706         end_url_with_slash(&buf, base);
 707
 708         for (cp = ref; (ch = *cp) != 0; cp++)
 709                 if (needs_quote(ch))
 710                         strbuf_addf(&buf, "%%%02x", ch);
 711                 else
 712                         strbuf_addch(&buf, *cp);
 713
 714         return strbuf_detach(&buf, NULL);
 715 }
 716
 717 void append_remote_object_url(struct strbuf *buf, const char *url,
 718                               const char *hex,
 719                               int only_two_digit_prefix)
 720 {
 721         end_url_with_slash(buf, url);
 722
 723         strbuf_addf(buf, "objects/%.*s/", 2, hex);
 724         if (!only_two_digit_prefix)
 725                 strbuf_addf(buf, "%s", hex+2);
 726 }
 727
 728 char *get_remote_object_url(const char *url, const char *hex,
 729                             int only_two_digit_prefix)
 730 {
 731         struct strbuf buf = STRBUF_INIT;
 732         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 733         return strbuf_detach(&buf, NULL);
 734 }
 735
 736 /* http_request() targets */
 737 #define HTTP_REQUEST_STRBUF     0
 738 #define HTTP_REQUEST_FILE       1
 739
 740 static int http_request(const char *url, void *result, int target, int options)
 741 {
 742         struct active_request_slot *slot;
 743         struct slot_results results;
 744         struct curl_slist *headers = NULL;
 745         struct strbuf buf = STRBUF_INIT;
 746         int ret;
 747
 748         slot = get_active_slot();
 749         slot->results = &results;
 750         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 751
 752         if (result == NULL) {
 753                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 754         } else {
 755                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 756                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 757
 758                 if (target == HTTP_REQUEST_FILE) {
 759                         long posn = ftell(result);
 760                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 761                                          fwrite);
 762                         if (posn > 0) {
 763                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 764                                 headers = curl_slist_append(headers, buf.buf);
 765                                 strbuf_reset(&buf);
 766                         }
 767                 } else
 768                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 769                                          fwrite_buffer);
 770         }
 771
 772         strbuf_addstr(&buf, "Pragma:");
 773         if (options & HTTP_NO_CACHE)
 774                 strbuf_addstr(&buf, " no-cache");
 775
 776         headers = curl_slist_append(headers, buf.buf);
 777
 778         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 779         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 780
 781         if (start_active_slot(slot)) {
 782                 run_active_slot(slot);
 783                 if (results.curl_result == CURLE_OK)
 784                         ret = HTTP_OK;
 785                 else if (missing_target(&results))
 786                         ret = HTTP_MISSING_TARGET;
 787                 else if (results.http_code == 401) {
 788                         if (http_auth.username && http_auth.password) {
 789                                 credential_reject(&http_auth);
 790                                 ret = HTTP_NOAUTH;
 791                         } else {
 792                                 credential_fill(&http_auth);
 793                                 init_curl_http_auth(slot->curl);
 794                                 ret = HTTP_REAUTH;
 795                         }
 796                 } else {
 797                         if (!curl_errorstr[0])
 798                                 strlcpy(curl_errorstr,
 799                                         curl_easy_strerror(results.curl_result),
 800                                         sizeof(curl_errorstr));
 801                         ret = HTTP_ERROR;
 802                 }
 803         } else {
 804                 error("Unable to start HTTP request for %s", url);
 805                 ret = HTTP_START_FAILED;
 806         }
 807
 808         curl_slist_free_all(headers);
 809         strbuf_release(&buf);
 810
 811         if (ret == HTTP_OK)
 812                 credential_approve(&http_auth);
 813
 814         return ret;
 815 }
 816
 817 static int http_request_reauth(const char *url, void *result, int target,
 818                                int options)
 819 {
 820         int ret = http_request(url, result, target, options);
 821         if (ret != HTTP_REAUTH)
 822                 return ret;
 823         return http_request(url, result, target, options);
 824 }
 825
 826 int http_get_strbuf(const char *url, struct strbuf *result, int options)
 827 {
 828         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
 829 }
 830
 831 /*
 832  * Downloads a URL and stores the result in the given file.
 833  *
 834  * If a previous interrupted download is detected (i.e. a previous temporary
 835  * file is still around) the download is resumed.
 836  */
 837 static int http_get_file(const char *url, const char *filename, int options)
 838 {
 839         int ret;
 840         struct strbuf tmpfile = STRBUF_INIT;
 841         FILE *result;
 842
 843         strbuf_addf(&tmpfile, "%s.temp", filename);
 844         result = fopen(tmpfile.buf, "a");
 845         if (! result) {
 846                 error("Unable to open local file %s", tmpfile.buf);
 847                 ret = HTTP_ERROR;
 848                 goto cleanup;
 849         }
 850
 851         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
 852         fclose(result);
 853
 854         if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 855                 ret = HTTP_ERROR;
 856 cleanup:
 857         strbuf_release(&tmpfile);
 858         return ret;
 859 }
 860
 861 int http_error(const char *url, int ret)
 862 {
 863         /* http_request has already handled HTTP_START_FAILED. */
 864         if (ret != HTTP_START_FAILED)
 865                 error("%s while accessing %s", curl_errorstr, url);
 866
 867         return ret;
 868 }
 869
 870 int http_fetch_ref(const char *base, struct ref *ref)
 871 {
 872         char *url;
 873         struct strbuf buffer = STRBUF_INIT;
 874         int ret = -1;
 875
 876         url = quote_ref_url(base, ref->name);
 877         if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 878                 strbuf_rtrim(&buffer);
 879                 if (buffer.len == 40)
 880                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 881                 else if (!prefixcmp(buffer.buf, "ref: ")) {
 882                         ref->symref = xstrdup(buffer.buf + 5);
 883                         ret = 0;
 884                 }
 885         }
 886
 887         strbuf_release(&buffer);
 888         free(url);
 889         return ret;
 890 }
 891
 892 /* Helpers for fetching packs */
 893 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 894 {
 895         char *url, *tmp;
 896         struct strbuf buf = STRBUF_INIT;
 897
 898         if (http_is_verbose)
 899                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 900
 901         end_url_with_slash(&buf, base_url);
 902         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 903         url = strbuf_detach(&buf, NULL);
 904
 905         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 906         tmp = strbuf_detach(&buf, NULL);
 907
 908         if (http_get_file(url, tmp, 0) != HTTP_OK) {
 909                 error("Unable to get pack index %s\n", url);
 910                 free(tmp);
 911                 tmp = NULL;
 912         }
 913
 914         free(url);
 915         return tmp;
 916 }
 917
 918 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 919         unsigned char *sha1, const char *base_url)
 920 {
 921         struct packed_git *new_pack;
 922         char *tmp_idx = NULL;
 923         int ret;
 924
 925         if (has_pack_index(sha1)) {
 926                 new_pack = parse_pack_index(sha1, NULL);
 927                 if (!new_pack)
 928                         return -1; /* parse_pack_index() already issued error message */
 929                 goto add_pack;
 930         }
 931
 932         tmp_idx = fetch_pack_index(sha1, base_url);
 933         if (!tmp_idx)
 934                 return -1;
 935
 936         new_pack = parse_pack_index(sha1, tmp_idx);
 937         if (!new_pack) {
 938                 unlink(tmp_idx);
 939                 free(tmp_idx);
 940
 941                 return -1; /* parse_pack_index() already issued error message */
 942         }
 943
 944         ret = verify_pack_index(new_pack);
 945         if (!ret) {
 946                 close_pack_index(new_pack);
 947                 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
 948         }
 949         free(tmp_idx);
 950         if (ret)
 951                 return -1;
 952
 953 add_pack:
 954         new_pack->next = *packs_head;
 955         *packs_head = new_pack;
 956         return 0;
 957 }
 958
 959 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 960 {
 961         int ret = 0, i = 0;
 962         char *url, *data;
 963         struct strbuf buf = STRBUF_INIT;
 964         unsigned char sha1[20];
 965
 966         end_url_with_slash(&buf, base_url);
 967         strbuf_addstr(&buf, "objects/info/packs");
 968         url = strbuf_detach(&buf, NULL);
 969
 970         ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 971         if (ret != HTTP_OK)
 972                 goto cleanup;
 973
 974         data = buf.buf;
 975         while (i < buf.len) {
 976                 switch (data[i]) {
 977                 case 'P':
 978                         i++;
 979                         if (i + 52 <= buf.len &&
 980                             !prefixcmp(data + i, " pack-") &&
 981                             !prefixcmp(data + i + 46, ".pack\n")) {
 982                                 get_sha1_hex(data + i + 6, sha1);
 983                                 fetch_and_setup_pack_index(packs_head, sha1,
 984                                                       base_url);
 985                                 i += 51;
 986                                 break;
 987                         }
 988                 default:
 989                         while (i < buf.len && data[i] != '\n')
 990                                 i++;
 991                 }
 992                 i++;
 993         }
 994
 995 cleanup:
 996         free(url);
 997         return ret;
 998 }
 999
1000 void release_http_pack_request(struct http_pack_request *preq)
1001 {
1002         if (preq->packfile != NULL) {
1003                 fclose(preq->packfile);
1004                 preq->packfile = NULL;
1005         }
1006         if (preq->range_header != NULL) {
1007                 curl_slist_free_all(preq->range_header);
1008                 preq->range_header = NULL;
1009         }
1010         preq->slot = NULL;
1011         free(preq->url);
1012 }
1013
1014 int finish_http_pack_request(struct http_pack_request *preq)
1015 {
1016         struct packed_git **lst;
1017         struct packed_git *p = preq->target;
1018         char *tmp_idx;
1019         struct child_process ip;
1020         const char *ip_argv[8];
1021
1022         close_pack_index(p);
1023
1024         fclose(preq->packfile);
1025         preq->packfile = NULL;
1026
1027         lst = preq->lst;
1028         while (*lst != p)
1029                 lst = &((*lst)->next);
1030         *lst = (*lst)->next;
1031
1032         tmp_idx = xstrdup(preq->tmpfile);
1033         strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1034                ".idx.temp");
1035
1036         ip_argv[0] = "index-pack";
1037         ip_argv[1] = "-o";
1038         ip_argv[2] = tmp_idx;
1039         ip_argv[3] = preq->tmpfile;
1040         ip_argv[4] = NULL;
1041
1042         memset(&ip, 0, sizeof(ip));
1043         ip.argv = ip_argv;
1044         ip.git_cmd = 1;
1045         ip.no_stdin = 1;
1046         ip.no_stdout = 1;
1047
1048         if (run_command(&ip)) {
1049                 unlink(preq->tmpfile);
1050                 unlink(tmp_idx);
1051                 free(tmp_idx);
1052                 return -1;
1053         }
1054
1055         unlink(sha1_pack_index_name(p->sha1));
1056
1057         if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1058          || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1059                 free(tmp_idx);
1060                 return -1;
1061         }
1062
1063         install_packed_git(p);
1064         free(tmp_idx);
1065         return 0;
1066 }
1067
1068 struct http_pack_request *new_http_pack_request(
1069         struct packed_git *target, const char *base_url)
1070 {
1071         long prev_posn = 0;
1072         char range[RANGE_HEADER_SIZE];
1073         struct strbuf buf = STRBUF_INIT;
1074         struct http_pack_request *preq;
1075
1076         preq = xcalloc(1, sizeof(*preq));
1077         preq->target = target;
1078
1079         end_url_with_slash(&buf, base_url);
1080         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1081                 sha1_to_hex(target->sha1));
1082         preq->url = strbuf_detach(&buf, NULL);
1083
1084         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1085                 sha1_pack_name(target->sha1));
1086         preq->packfile = fopen(preq->tmpfile, "a");
1087         if (!preq->packfile) {
1088                 error("Unable to open local file %s for pack",
1089                       preq->tmpfile);
1090                 goto abort;
1091         }
1092
1093         preq->slot = get_active_slot();
1094         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1095         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1096         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1097         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1098                 no_pragma_header);
1099
1100         /*
1101          * If there is data present from a previous transfer attempt,
1102          * resume where it left off
1103          */
1104         prev_posn = ftell(preq->packfile);
1105         if (prev_posn>0) {
1106                 if (http_is_verbose)
1107                         fprintf(stderr,
1108                                 "Resuming fetch of pack %s at byte %ld\n",
1109                                 sha1_to_hex(target->sha1), prev_posn);
1110                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1111                 preq->range_header = curl_slist_append(NULL, range);
1112                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1113                         preq->range_header);
1114         }
1115
1116         return preq;
1117
1118 abort:
1119         free(preq->url);
1120         free(preq);
1121         return NULL;
1122 }
1123
1124 /* Helpers for fetching objects (loose) */
1125 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1126                                void *data)
1127 {
1128         unsigned char expn[4096];
1129         size_t size = eltsize * nmemb;
1130         int posn = 0;
1131         struct http_object_request *freq =
1132                 (struct http_object_request *)data;
1133         do {
1134                 ssize_t retval = xwrite(freq->localfile,
1135                                         (char *) ptr + posn, size - posn);
1136                 if (retval < 0)
1137                         return posn;
1138                 posn += retval;
1139         } while (posn < size);
1140
1141         freq->stream.avail_in = size;
1142         freq->stream.next_in = (void *)ptr;
1143         do {
1144                 freq->stream.next_out = expn;
1145                 freq->stream.avail_out = sizeof(expn);
1146                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1147                 git_SHA1_Update(&freq->c, expn,
1148                                 sizeof(expn) - freq->stream.avail_out);
1149         } while (freq->stream.avail_in && freq->zret == Z_OK);
1150         return size;
1151 }
1152
1153 struct http_object_request *new_http_object_request(const char *base_url,
1154         unsigned char *sha1)
1155 {
1156         char *hex = sha1_to_hex(sha1);
1157         char *filename;
1158         char prevfile[PATH_MAX];
1159         int prevlocal;
1160         char prev_buf[PREV_BUF_SIZE];
1161         ssize_t prev_read = 0;
1162         long prev_posn = 0;
1163         char range[RANGE_HEADER_SIZE];
1164         struct curl_slist *range_header = NULL;
1165         struct http_object_request *freq;
1166
1167         freq = xcalloc(1, sizeof(*freq));
1168         hashcpy(freq->sha1, sha1);
1169         freq->localfile = -1;
1170
1171         filename = sha1_file_name(sha1);
1172         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1173                  "%s.temp", filename);
1174
1175         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1176         unlink_or_warn(prevfile);
1177         rename(freq->tmpfile, prevfile);
1178         unlink_or_warn(freq->tmpfile);
1179
1180         if (freq->localfile != -1)
1181                 error("fd leakage in start: %d", freq->localfile);
1182         freq->localfile = open(freq->tmpfile,
1183                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1184         /*
1185          * This could have failed due to the "lazy directory creation";
1186          * try to mkdir the last path component.
1187          */
1188         if (freq->localfile < 0 && errno == ENOENT) {
1189                 char *dir = strrchr(freq->tmpfile, '/');
1190                 if (dir) {
1191                         *dir = 0;
1192                         mkdir(freq->tmpfile, 0777);
1193                         *dir = '/';
1194                 }
1195                 freq->localfile = open(freq->tmpfile,
1196                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1197         }
1198
1199         if (freq->localfile < 0) {
1200                 error("Couldn't create temporary file %s: %s",
1201                       freq->tmpfile, strerror(errno));
1202                 goto abort;
1203         }
1204
1205         git_inflate_init(&freq->stream);
1206
1207         git_SHA1_Init(&freq->c);
1208
1209         freq->url = get_remote_object_url(base_url, hex, 0);
1210
1211         /*
1212          * If a previous temp file is present, process what was already
1213          * fetched.
1214          */
1215         prevlocal = open(prevfile, O_RDONLY);
1216         if (prevlocal != -1) {
1217                 do {
1218                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1219                         if (prev_read>0) {
1220                                 if (fwrite_sha1_file(prev_buf,
1221                                                      1,
1222                                                      prev_read,
1223                                                      freq) == prev_read) {
1224                                         prev_posn += prev_read;
1225                                 } else {
1226                                         prev_read = -1;
1227                                 }
1228                         }
1229                 } while (prev_read > 0);
1230                 close(prevlocal);
1231         }
1232         unlink_or_warn(prevfile);
1233
1234         /*
1235          * Reset inflate/SHA1 if there was an error reading the previous temp
1236          * file; also rewind to the beginning of the local file.
1237          */
1238         if (prev_read == -1) {
1239                 memset(&freq->stream, 0, sizeof(freq->stream));
1240                 git_inflate_init(&freq->stream);
1241                 git_SHA1_Init(&freq->c);
1242                 if (prev_posn>0) {
1243                         prev_posn = 0;
1244                         lseek(freq->localfile, 0, SEEK_SET);
1245                         if (ftruncate(freq->localfile, 0) < 0) {
1246                                 error("Couldn't truncate temporary file %s: %s",
1247                                           freq->tmpfile, strerror(errno));
1248                                 goto abort;
1249                         }
1250                 }
1251         }
1252
1253         freq->slot = get_active_slot();
1254
1255         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1256         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1257         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1258         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1259         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1260
1261         /*
1262          * If we have successfully processed data from a previous fetch
1263          * attempt, only fetch the data we don't already have.
1264          */
1265         if (prev_posn>0) {
1266                 if (http_is_verbose)
1267                         fprintf(stderr,
1268                                 "Resuming fetch of object %s at byte %ld\n",
1269                                 hex, prev_posn);
1270                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1271                 range_header = curl_slist_append(range_header, range);
1272                 curl_easy_setopt(freq->slot->curl,
1273                                  CURLOPT_HTTPHEADER, range_header);
1274         }
1275
1276         return freq;
1277
1278 abort:
1279         free(freq->url);
1280         free(freq);
1281         return NULL;
1282 }
1283
1284 void process_http_object_request(struct http_object_request *freq)
1285 {
1286         if (freq->slot == NULL)
1287                 return;
1288         freq->curl_result = freq->slot->curl_result;
1289         freq->http_code = freq->slot->http_code;
1290         freq->slot = NULL;
1291 }
1292
1293 int finish_http_object_request(struct http_object_request *freq)
1294 {
1295         struct stat st;
1296
1297         close(freq->localfile);
1298         freq->localfile = -1;
1299
1300         process_http_object_request(freq);
1301
1302         if (freq->http_code == 416) {
1303                 warning("requested range invalid; we may already have all the data.");
1304         } else if (freq->curl_result != CURLE_OK) {
1305                 if (stat(freq->tmpfile, &st) == 0)
1306                         if (st.st_size == 0)
1307                                 unlink_or_warn(freq->tmpfile);
1308                 return -1;
1309         }
1310
1311         git_inflate_end(&freq->stream);
1312         git_SHA1_Final(freq->real_sha1, &freq->c);
1313         if (freq->zret != Z_STREAM_END) {
1314                 unlink_or_warn(freq->tmpfile);
1315                 return -1;
1316         }
1317         if (hashcmp(freq->sha1, freq->real_sha1)) {
1318                 unlink_or_warn(freq->tmpfile);
1319                 return -1;
1320         }
1321         freq->rename =
1322                 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1323
1324         return freq->rename;
1325 }
1326
1327 void abort_http_object_request(struct http_object_request *freq)
1328 {
1329         unlink_or_warn(freq->tmpfile);
1330
1331         release_http_object_request(freq);
1332 }
1333
1334 void release_http_object_request(struct http_object_request *freq)
1335 {
1336         if (freq->localfile != -1) {
1337                 close(freq->localfile);
1338                 freq->localfile = -1;
1339         }
1340         if (freq->url != NULL) {
1341                 free(freq->url);
1342                 freq->url = NULL;
1343         }
1344         if (freq->slot != NULL) {
1345                 freq->slot->callback_func = NULL;
1346                 freq->slot->callback_data = NULL;
1347                 release_active_slot(freq->slot);
1348                 freq->slot = NULL;
1349         }
1350 }