git.oblomov.eu Git - git/blob - 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
 301         return result;
 302 }
 303
 304 static void set_from_env(const char **var, const char *envname)
 305 {
 306         const char *val = getenv(envname);
 307         if (val)
 308                 *var = val;
 309 }
 310
 311 void http_init(struct remote *remote, const char *url, int proactive_auth)
 312 {
 313         char *low_speed_limit;
 314         char *low_speed_time;
 315
 316         http_is_verbose = 0;
 317
 318         git_config(http_options, NULL);
 319
 320         curl_global_init(CURL_GLOBAL_ALL);
 321
 322         http_proactive_auth = proactive_auth;
 323
 324         if (remote && remote->http_proxy)
 325                 curl_http_proxy = xstrdup(remote->http_proxy);
 326
 327         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 328         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 329
 330 #ifdef USE_CURL_MULTI
 331         {
 332                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 333                 if (http_max_requests != NULL)
 334                         max_requests = atoi(http_max_requests);
 335         }
 336
 337         curlm = curl_multi_init();
 338         if (curlm == NULL) {
 339                 fprintf(stderr, "Error creating curl multi handle.\n");
 340                 exit(1);
 341         }
 342 #endif
 343
 344         if (getenv("GIT_SSL_NO_VERIFY"))
 345                 curl_ssl_verify = 0;
 346
 347         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 348 #if LIBCURL_VERSION_NUM >= 0x070903
 349         set_from_env(&ssl_key, "GIT_SSL_KEY");
 350 #endif
 351 #if LIBCURL_VERSION_NUM >= 0x070908
 352         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 353 #endif
 354         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 355
 356         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 357
 358         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 359         if (low_speed_limit != NULL)
 360                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 361         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 362         if (low_speed_time != NULL)
 363                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 364
 365         if (curl_ssl_verify == -1)
 366                 curl_ssl_verify = 1;
 367
 368         curl_session_count = 0;
 369 #ifdef USE_CURL_MULTI
 370         if (max_requests < 1)
 371                 max_requests = DEFAULT_MAX_REQUESTS;
 372 #endif
 373
 374         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 375                 curl_ftp_no_epsv = 1;
 376
 377         if (url) {
 378                 credential_from_url(&http_auth, url);
 379                 if (!ssl_cert_password_required &&
 380                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 381                     !prefixcmp(url, "https://"))
 382                         ssl_cert_password_required = 1;
 383         }
 384
 385 #ifndef NO_CURL_EASY_DUPHANDLE
 386         curl_default = get_curl_handle();
 387 #endif
 388 }
 389
 390 void http_cleanup(void)
 391 {
 392         struct active_request_slot *slot = active_queue_head;
 393
 394         while (slot != NULL) {
 395                 struct active_request_slot *next = slot->next;
 396                 if (slot->curl != NULL) {
 397 #ifdef USE_CURL_MULTI
 398                         curl_multi_remove_handle(curlm, slot->curl);
 399 #endif
 400                         curl_easy_cleanup(slot->curl);
 401                 }
 402                 free(slot);
 403                 slot = next;
 404         }
 405         active_queue_head = NULL;
 406
 407 #ifndef NO_CURL_EASY_DUPHANDLE
 408         curl_easy_cleanup(curl_default);
 409 #endif
 410
 411 #ifdef USE_CURL_MULTI
 412         curl_multi_cleanup(curlm);
 413 #endif
 414         curl_global_cleanup();
 415
 416         curl_slist_free_all(pragma_header);
 417         pragma_header = NULL;
 418
 419         curl_slist_free_all(no_pragma_header);
 420         no_pragma_header = NULL;
 421
 422         if (curl_http_proxy) {
 423                 free((void *)curl_http_proxy);
 424                 curl_http_proxy = NULL;
 425         }
 426
 427         if (cert_auth.password != NULL) {
 428                 memset(cert_auth.password, 0, strlen(cert_auth.password));
 429                 free(cert_auth.password);
 430                 cert_auth.password = NULL;
 431         }
 432         ssl_cert_password_required = 0;
 433 }
 434
 435 struct active_request_slot *get_active_slot(void)
 436 {
 437         struct active_request_slot *slot = active_queue_head;
 438         struct active_request_slot *newslot;
 439
 440 #ifdef USE_CURL_MULTI
 441         int num_transfers;
 442
 443         /* Wait for a slot to open up if the queue is full */
 444         while (active_requests >= max_requests) {
 445                 curl_multi_perform(curlm, &num_transfers);
 446                 if (num_transfers < active_requests)
 447                         process_curl_messages();
 448         }
 449 #endif
 450
 451         while (slot != NULL && slot->in_use)
 452                 slot = slot->next;
 453
 454         if (slot == NULL) {
 455                 newslot = xmalloc(sizeof(*newslot));
 456                 newslot->curl = NULL;
 457                 newslot->in_use = 0;
 458                 newslot->next = NULL;
 459
 460                 slot = active_queue_head;
 461                 if (slot == NULL) {
 462                         active_queue_head = newslot;
 463                 } else {
 464                         while (slot->next != NULL)
 465                                 slot = slot->next;
 466                         slot->next = newslot;
 467                 }
 468                 slot = newslot;
 469         }
 470
 471         if (slot->curl == NULL) {
 472 #ifdef NO_CURL_EASY_DUPHANDLE
 473                 slot->curl = get_curl_handle();
 474 #else
 475                 slot->curl = curl_easy_duphandle(curl_default);
 476 #endif
 477                 curl_session_count++;
 478         }
 479
 480         active_requests++;
 481         slot->in_use = 1;
 482         slot->results = NULL;
 483         slot->finished = NULL;
 484         slot->callback_data = NULL;
 485         slot->callback_func = NULL;
 486         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 487         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 488         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 489         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 490         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 491         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 492         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 493         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 494         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 495
 496         return slot;
 497 }
 498
 499 int start_active_slot(struct active_request_slot *slot)
 500 {
 501 #ifdef USE_CURL_MULTI
 502         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 503         int num_transfers;
 504
 505         if (curlm_result != CURLM_OK &&
 506             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 507                 active_requests--;
 508                 slot->in_use = 0;
 509                 return 0;
 510         }
 511
 512         /*
 513          * We know there must be something to do, since we just added
 514          * something.
 515          */
 516         curl_multi_perform(curlm, &num_transfers);
 517 #endif
 518         return 1;
 519 }
 520
 521 #ifdef USE_CURL_MULTI
 522 struct fill_chain {
 523         void *data;
 524         int (*fill)(void *);
 525         struct fill_chain *next;
 526 };
 527
 528 static struct fill_chain *fill_cfg;
 529
 530 void add_fill_function(void *data, int (*fill)(void *))
 531 {
 532         struct fill_chain *new = xmalloc(sizeof(*new));
 533         struct fill_chain **linkp = &fill_cfg;
 534         new->data = data;
 535         new->fill = fill;
 536         new->next = NULL;
 537         while (*linkp)
 538                 linkp = &(*linkp)->next;
 539         *linkp = new;
 540 }
 541
 542 void fill_active_slots(void)
 543 {
 544         struct active_request_slot *slot = active_queue_head;
 545
 546         while (active_requests < max_requests) {
 547                 struct fill_chain *fill;
 548                 for (fill = fill_cfg; fill; fill = fill->next)
 549                         if (fill->fill(fill->data))
 550                                 break;
 551
 552                 if (!fill)
 553                         break;
 554         }
 555
 556         while (slot != NULL) {
 557                 if (!slot->in_use && slot->curl != NULL
 558                         && curl_session_count > min_curl_sessions) {
 559                         curl_easy_cleanup(slot->curl);
 560                         slot->curl = NULL;
 561                         curl_session_count--;
 562                 }
 563                 slot = slot->next;
 564         }
 565 }
 566
 567 void step_active_slots(void)
 568 {
 569         int num_transfers;
 570         CURLMcode curlm_result;
 571
 572         do {
 573                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 574         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 575         if (num_transfers < active_requests) {
 576                 process_curl_messages();
 577                 fill_active_slots();
 578         }
 579 }
 580 #endif
 581
 582 void run_active_slot(struct active_request_slot *slot)
 583 {
 584 #ifdef USE_CURL_MULTI
 585         fd_set readfds;
 586         fd_set writefds;
 587         fd_set excfds;
 588         int max_fd;
 589         struct timeval select_timeout;
 590         int finished = 0;
 591
 592         slot->finished = &finished;
 593         while (!finished) {
 594                 step_active_slots();
 595
 596                 if (slot->in_use) {
 597 #if LIBCURL_VERSION_NUM >= 0x070f04
 598                         long curl_timeout;
 599                         curl_multi_timeout(curlm, &curl_timeout);
 600                         if (curl_timeout == 0) {
 601                                 continue;
 602                         } else if (curl_timeout == -1) {
 603                                 select_timeout.tv_sec  = 0;
 604                                 select_timeout.tv_usec = 50000;
 605                         } else {
 606                                 select_timeout.tv_sec  =  curl_timeout / 1000;
 607                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 608                         }
 609 #else
 610                         select_timeout.tv_sec  = 0;
 611                         select_timeout.tv_usec = 50000;
 612 #endif
 613
 614                         max_fd = -1;
 615                         FD_ZERO(&readfds);
 616                         FD_ZERO(&writefds);
 617                         FD_ZERO(&excfds);
 618                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 619
 620                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 621                 }
 622         }
 623 #else
 624         while (slot->in_use) {
 625                 slot->curl_result = curl_easy_perform(slot->curl);
 626                 finish_active_slot(slot);
 627         }
 628 #endif
 629 }
 630
 631 static void closedown_active_slot(struct active_request_slot *slot)
 632 {
 633         active_requests--;
 634         slot->in_use = 0;
 635 }
 636
 637 static void release_active_slot(struct active_request_slot *slot)
 638 {
 639         closedown_active_slot(slot);
 640         if (slot->curl && curl_session_count > min_curl_sessions) {
 641 #ifdef USE_CURL_MULTI
 642                 curl_multi_remove_handle(curlm, slot->curl);
 643 #endif
 644                 curl_easy_cleanup(slot->curl);
 645                 slot->curl = NULL;
 646                 curl_session_count--;
 647         }
 648 #ifdef USE_CURL_MULTI
 649         fill_active_slots();
 650 #endif
 651 }
 652
 653 void finish_active_slot(struct active_request_slot *slot)
 654 {
 655         closedown_active_slot(slot);
 656         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 657
 658         if (slot->finished != NULL)
 659                 (*slot->finished) = 1;
 660
 661         /* Store slot results so they can be read after the slot is reused */
 662         if (slot->results != NULL) {
 663                 slot->results->curl_result = slot->curl_result;
 664                 slot->results->http_code = slot->http_code;
 665         }
 666
 667         /* Run callback if appropriate */
 668         if (slot->callback_func != NULL)
 669                 slot->callback_func(slot->callback_data);
 670 }
 671
 672 void finish_all_active_slots(void)
 673 {
 674         struct active_request_slot *slot = active_queue_head;
 675
 676         while (slot != NULL)
 677                 if (slot->in_use) {
 678                         run_active_slot(slot);
 679                         slot = active_queue_head;
 680                 } else {
 681                         slot = slot->next;
 682                 }
 683 }
 684
 685 /* Helpers for modifying and creating URLs */
 686 static inline int needs_quote(int ch)
 687 {
 688         if (((ch >= 'A') && (ch <= 'Z'))
 689                         || ((ch >= 'a') && (ch <= 'z'))
 690                         || ((ch >= '0') && (ch <= '9'))
 691                         || (ch == '/')
 692                         || (ch == '-')
 693                         || (ch == '.'))
 694                 return 0;
 695         return 1;
 696 }
 697
 698 static char *quote_ref_url(const char *base, const char *ref)
 699 {
 700         struct strbuf buf = STRBUF_INIT;
 701         const char *cp;
 702         int ch;
 703
 704         end_url_with_slash(&buf, base);
 705
 706         for (cp = ref; (ch = *cp) != 0; cp++)
 707                 if (needs_quote(ch))
 708                         strbuf_addf(&buf, "%%%02x", ch);
 709                 else
 710                         strbuf_addch(&buf, *cp);
 711
 712         return strbuf_detach(&buf, NULL);
 713 }
 714
 715 void append_remote_object_url(struct strbuf *buf, const char *url,
 716                               const char *hex,
 717                               int only_two_digit_prefix)
 718 {
 719         end_url_with_slash(buf, url);
 720
 721         strbuf_addf(buf, "objects/%.*s/", 2, hex);
 722         if (!only_two_digit_prefix)
 723                 strbuf_addf(buf, "%s", hex+2);
 724 }
 725
 726 char *get_remote_object_url(const char *url, const char *hex,
 727                             int only_two_digit_prefix)
 728 {
 729         struct strbuf buf = STRBUF_INIT;
 730         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 731         return strbuf_detach(&buf, NULL);
 732 }
 733
 734 /* http_request() targets */
 735 #define HTTP_REQUEST_STRBUF     0
 736 #define HTTP_REQUEST_FILE       1
 737
 738 static int http_request(const char *url, void *result, int target, int options)
 739 {
 740         struct active_request_slot *slot;
 741         struct slot_results results;
 742         struct curl_slist *headers = NULL;
 743         struct strbuf buf = STRBUF_INIT;
 744         int ret;
 745
 746         slot = get_active_slot();
 747         slot->results = &results;
 748         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 749
 750         if (result == NULL) {
 751                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 752         } else {
 753                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 754                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 755
 756                 if (target == HTTP_REQUEST_FILE) {
 757                         long posn = ftell(result);
 758                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 759                                          fwrite);
 760                         if (posn > 0) {
 761                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 762                                 headers = curl_slist_append(headers, buf.buf);
 763                                 strbuf_reset(&buf);
 764                         }
 765                 } else
 766                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 767                                          fwrite_buffer);
 768         }
 769
 770         strbuf_addstr(&buf, "Pragma:");
 771         if (options & HTTP_NO_CACHE)
 772                 strbuf_addstr(&buf, " no-cache");
 773
 774         headers = curl_slist_append(headers, buf.buf);
 775
 776         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 777         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 778
 779         if (start_active_slot(slot)) {
 780                 run_active_slot(slot);
 781                 if (results.curl_result == CURLE_OK)
 782                         ret = HTTP_OK;
 783                 else if (missing_target(&results))
 784                         ret = HTTP_MISSING_TARGET;
 785                 else if (results.http_code == 401) {
 786                         if (http_auth.username && http_auth.password) {
 787                                 credential_reject(&http_auth);
 788                                 ret = HTTP_NOAUTH;
 789                         } else {
 790                                 credential_fill(&http_auth);
 791                                 init_curl_http_auth(slot->curl);
 792                                 ret = HTTP_REAUTH;
 793                         }
 794                 } else {
 795                         if (!curl_errorstr[0])
 796                                 strlcpy(curl_errorstr,
 797                                         curl_easy_strerror(results.curl_result),
 798                                         sizeof(curl_errorstr));
 799                         ret = HTTP_ERROR;
 800                 }
 801         } else {
 802                 error("Unable to start HTTP request for %s", url);
 803                 ret = HTTP_START_FAILED;
 804         }
 805
 806         curl_slist_free_all(headers);
 807         strbuf_release(&buf);
 808
 809         if (ret == HTTP_OK)
 810                 credential_approve(&http_auth);
 811
 812         return ret;
 813 }
 814
 815 static int http_request_reauth(const char *url, void *result, int target,
 816                                int options)
 817 {
 818         int ret = http_request(url, result, target, options);
 819         if (ret != HTTP_REAUTH)
 820                 return ret;
 821         return http_request(url, result, target, options);
 822 }
 823
 824 int http_get_strbuf(const char *url, struct strbuf *result, int options)
 825 {
 826         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
 827 }
 828
 829 /*
 830  * Downloads an url and stores the result in the given file.
 831  *
 832  * If a previous interrupted download is detected (i.e. a previous temporary
 833  * file is still around) the download is resumed.
 834  */
 835 static int http_get_file(const char *url, const char *filename, int options)
 836 {
 837         int ret;
 838         struct strbuf tmpfile = STRBUF_INIT;
 839         FILE *result;
 840
 841         strbuf_addf(&tmpfile, "%s.temp", filename);
 842         result = fopen(tmpfile.buf, "a");
 843         if (! result) {
 844                 error("Unable to open local file %s", tmpfile.buf);
 845                 ret = HTTP_ERROR;
 846                 goto cleanup;
 847         }
 848
 849         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
 850         fclose(result);
 851
 852         if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 853                 ret = HTTP_ERROR;
 854 cleanup:
 855         strbuf_release(&tmpfile);
 856         return ret;
 857 }
 858
 859 int http_error(const char *url, int ret)
 860 {
 861         /* http_request has already handled HTTP_START_FAILED. */
 862         if (ret != HTTP_START_FAILED)
 863                 error("%s while accessing %s", curl_errorstr, url);
 864
 865         return ret;
 866 }
 867
 868 int http_fetch_ref(const char *base, struct ref *ref)
 869 {
 870         char *url;
 871         struct strbuf buffer = STRBUF_INIT;
 872         int ret = -1;
 873
 874         url = quote_ref_url(base, ref->name);
 875         if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 876                 strbuf_rtrim(&buffer);
 877                 if (buffer.len == 40)
 878                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 879                 else if (!prefixcmp(buffer.buf, "ref: ")) {
 880                         ref->symref = xstrdup(buffer.buf + 5);
 881                         ret = 0;
 882                 }
 883         }
 884
 885         strbuf_release(&buffer);
 886         free(url);
 887         return ret;
 888 }
 889
 890 /* Helpers for fetching packs */
 891 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 892 {
 893         char *url, *tmp;
 894         struct strbuf buf = STRBUF_INIT;
 895
 896         if (http_is_verbose)
 897                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 898
 899         end_url_with_slash(&buf, base_url);
 900         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 901         url = strbuf_detach(&buf, NULL);
 902
 903         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 904         tmp = strbuf_detach(&buf, NULL);
 905
 906         if (http_get_file(url, tmp, 0) != HTTP_OK) {
 907                 error("Unable to get pack index %s\n", url);
 908                 free(tmp);
 909                 tmp = NULL;
 910         }
 911
 912         free(url);
 913         return tmp;
 914 }
 915
 916 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 917         unsigned char *sha1, const char *base_url)
 918 {
 919         struct packed_git *new_pack;
 920         char *tmp_idx = NULL;
 921         int ret;
 922
 923         if (has_pack_index(sha1)) {
 924                 new_pack = parse_pack_index(sha1, NULL);
 925                 if (!new_pack)
 926                         return -1; /* parse_pack_index() already issued error message */
 927                 goto add_pack;
 928         }
 929
 930         tmp_idx = fetch_pack_index(sha1, base_url);
 931         if (!tmp_idx)
 932                 return -1;
 933
 934         new_pack = parse_pack_index(sha1, tmp_idx);
 935         if (!new_pack) {
 936                 unlink(tmp_idx);
 937                 free(tmp_idx);
 938
 939                 return -1; /* parse_pack_index() already issued error message */
 940         }
 941
 942         ret = verify_pack_index(new_pack);
 943         if (!ret) {
 944                 close_pack_index(new_pack);
 945                 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
 946         }
 947         free(tmp_idx);
 948         if (ret)
 949                 return -1;
 950
 951 add_pack:
 952         new_pack->next = *packs_head;
 953         *packs_head = new_pack;
 954         return 0;
 955 }
 956
 957 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 958 {
 959         int ret = 0, i = 0;
 960         char *url, *data;
 961         struct strbuf buf = STRBUF_INIT;
 962         unsigned char sha1[20];
 963
 964         end_url_with_slash(&buf, base_url);
 965         strbuf_addstr(&buf, "objects/info/packs");
 966         url = strbuf_detach(&buf, NULL);
 967
 968         ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 969         if (ret != HTTP_OK)
 970                 goto cleanup;
 971
 972         data = buf.buf;
 973         while (i < buf.len) {
 974                 switch (data[i]) {
 975                 case 'P':
 976                         i++;
 977                         if (i + 52 <= buf.len &&
 978                             !prefixcmp(data + i, " pack-") &&
 979                             !prefixcmp(data + i + 46, ".pack\n")) {
 980                                 get_sha1_hex(data + i + 6, sha1);
 981                                 fetch_and_setup_pack_index(packs_head, sha1,
 982                                                       base_url);
 983                                 i += 51;
 984                                 break;
 985                         }
 986                 default:
 987                         while (i < buf.len && data[i] != '\n')
 988                                 i++;
 989                 }
 990                 i++;
 991         }
 992
 993 cleanup:
 994         free(url);
 995         return ret;
 996 }
 997
 998 void release_http_pack_request(struct http_pack_request *preq)
 999 {
1000         if (preq->packfile != NULL) {
1001                 fclose(preq->packfile);
1002                 preq->packfile = NULL;
1003         }
1004         if (preq->range_header != NULL) {
1005                 curl_slist_free_all(preq->range_header);
1006                 preq->range_header = NULL;
1007         }
1008         preq->slot = NULL;
1009         free(preq->url);
1010 }
1011
1012 int finish_http_pack_request(struct http_pack_request *preq)
1013 {
1014         struct packed_git **lst;
1015         struct packed_git *p = preq->target;
1016         char *tmp_idx;
1017         struct child_process ip;
1018         const char *ip_argv[8];
1019
1020         close_pack_index(p);
1021
1022         fclose(preq->packfile);
1023         preq->packfile = NULL;
1024
1025         lst = preq->lst;
1026         while (*lst != p)
1027                 lst = &((*lst)->next);
1028         *lst = (*lst)->next;
1029
1030         tmp_idx = xstrdup(preq->tmpfile);
1031         strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1032                ".idx.temp");
1033
1034         ip_argv[0] = "index-pack";
1035         ip_argv[1] = "-o";
1036         ip_argv[2] = tmp_idx;
1037         ip_argv[3] = preq->tmpfile;
1038         ip_argv[4] = NULL;
1039
1040         memset(&ip, 0, sizeof(ip));
1041         ip.argv = ip_argv;
1042         ip.git_cmd = 1;
1043         ip.no_stdin = 1;
1044         ip.no_stdout = 1;
1045
1046         if (run_command(&ip)) {
1047                 unlink(preq->tmpfile);
1048                 unlink(tmp_idx);
1049                 free(tmp_idx);
1050                 return -1;
1051         }
1052
1053         unlink(sha1_pack_index_name(p->sha1));
1054
1055         if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1056          || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1057                 free(tmp_idx);
1058                 return -1;
1059         }
1060
1061         install_packed_git(p);
1062         free(tmp_idx);
1063         return 0;
1064 }
1065
1066 struct http_pack_request *new_http_pack_request(
1067         struct packed_git *target, const char *base_url)
1068 {
1069         long prev_posn = 0;
1070         char range[RANGE_HEADER_SIZE];
1071         struct strbuf buf = STRBUF_INIT;
1072         struct http_pack_request *preq;
1073
1074         preq = xcalloc(1, sizeof(*preq));
1075         preq->target = target;
1076
1077         end_url_with_slash(&buf, base_url);
1078         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1079                 sha1_to_hex(target->sha1));
1080         preq->url = strbuf_detach(&buf, NULL);
1081
1082         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1083                 sha1_pack_name(target->sha1));
1084         preq->packfile = fopen(preq->tmpfile, "a");
1085         if (!preq->packfile) {
1086                 error("Unable to open local file %s for pack",
1087                       preq->tmpfile);
1088                 goto abort;
1089         }
1090
1091         preq->slot = get_active_slot();
1092         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1093         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1094         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1095         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1096                 no_pragma_header);
1097
1098         /*
1099          * If there is data present from a previous transfer attempt,
1100          * resume where it left off
1101          */
1102         prev_posn = ftell(preq->packfile);
1103         if (prev_posn>0) {
1104                 if (http_is_verbose)
1105                         fprintf(stderr,
1106                                 "Resuming fetch of pack %s at byte %ld\n",
1107                                 sha1_to_hex(target->sha1), prev_posn);
1108                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1109                 preq->range_header = curl_slist_append(NULL, range);
1110                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1111                         preq->range_header);
1112         }
1113
1114         return preq;
1115
1116 abort:
1117         free(preq->url);
1118         free(preq);
1119         return NULL;
1120 }
1121
1122 /* Helpers for fetching objects (loose) */
1123 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1124                                void *data)
1125 {
1126         unsigned char expn[4096];
1127         size_t size = eltsize * nmemb;
1128         int posn = 0;
1129         struct http_object_request *freq =
1130                 (struct http_object_request *)data;
1131         do {
1132                 ssize_t retval = xwrite(freq->localfile,
1133                                         (char *) ptr + posn, size - posn);
1134                 if (retval < 0)
1135                         return posn;
1136                 posn += retval;
1137         } while (posn < size);
1138
1139         freq->stream.avail_in = size;
1140         freq->stream.next_in = (void *)ptr;
1141         do {
1142                 freq->stream.next_out = expn;
1143                 freq->stream.avail_out = sizeof(expn);
1144                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1145                 git_SHA1_Update(&freq->c, expn,
1146                                 sizeof(expn) - freq->stream.avail_out);
1147         } while (freq->stream.avail_in && freq->zret == Z_OK);
1148         return size;
1149 }
1150
1151 struct http_object_request *new_http_object_request(const char *base_url,
1152         unsigned char *sha1)
1153 {
1154         char *hex = sha1_to_hex(sha1);
1155         char *filename;
1156         char prevfile[PATH_MAX];
1157         int prevlocal;
1158         char prev_buf[PREV_BUF_SIZE];
1159         ssize_t prev_read = 0;
1160         long prev_posn = 0;
1161         char range[RANGE_HEADER_SIZE];
1162         struct curl_slist *range_header = NULL;
1163         struct http_object_request *freq;
1164
1165         freq = xcalloc(1, sizeof(*freq));
1166         hashcpy(freq->sha1, sha1);
1167         freq->localfile = -1;
1168
1169         filename = sha1_file_name(sha1);
1170         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1171                  "%s.temp", filename);
1172
1173         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1174         unlink_or_warn(prevfile);
1175         rename(freq->tmpfile, prevfile);
1176         unlink_or_warn(freq->tmpfile);
1177
1178         if (freq->localfile != -1)
1179                 error("fd leakage in start: %d", freq->localfile);
1180         freq->localfile = open(freq->tmpfile,
1181                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1182         /*
1183          * This could have failed due to the "lazy directory creation";
1184          * try to mkdir the last path component.
1185          */
1186         if (freq->localfile < 0 && errno == ENOENT) {
1187                 char *dir = strrchr(freq->tmpfile, '/');
1188                 if (dir) {
1189                         *dir = 0;
1190                         mkdir(freq->tmpfile, 0777);
1191                         *dir = '/';
1192                 }
1193                 freq->localfile = open(freq->tmpfile,
1194                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1195         }
1196
1197         if (freq->localfile < 0) {
1198                 error("Couldn't create temporary file %s: %s",
1199                       freq->tmpfile, strerror(errno));
1200                 goto abort;
1201         }
1202
1203         git_inflate_init(&freq->stream);
1204
1205         git_SHA1_Init(&freq->c);
1206
1207         freq->url = get_remote_object_url(base_url, hex, 0);
1208
1209         /*
1210          * If a previous temp file is present, process what was already
1211          * fetched.
1212          */
1213         prevlocal = open(prevfile, O_RDONLY);
1214         if (prevlocal != -1) {
1215                 do {
1216                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1217                         if (prev_read>0) {
1218                                 if (fwrite_sha1_file(prev_buf,
1219                                                      1,
1220                                                      prev_read,
1221                                                      freq) == prev_read) {
1222                                         prev_posn += prev_read;
1223                                 } else {
1224                                         prev_read = -1;
1225                                 }
1226                         }
1227                 } while (prev_read > 0);
1228                 close(prevlocal);
1229         }
1230         unlink_or_warn(prevfile);
1231
1232         /*
1233          * Reset inflate/SHA1 if there was an error reading the previous temp
1234          * file; also rewind to the beginning of the local file.
1235          */
1236         if (prev_read == -1) {
1237                 memset(&freq->stream, 0, sizeof(freq->stream));
1238                 git_inflate_init(&freq->stream);
1239                 git_SHA1_Init(&freq->c);
1240                 if (prev_posn>0) {
1241                         prev_posn = 0;
1242                         lseek(freq->localfile, 0, SEEK_SET);
1243                         if (ftruncate(freq->localfile, 0) < 0) {
1244                                 error("Couldn't truncate temporary file %s: %s",
1245                                           freq->tmpfile, strerror(errno));
1246                                 goto abort;
1247                         }
1248                 }
1249         }
1250
1251         freq->slot = get_active_slot();
1252
1253         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1254         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1255         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1256         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1257         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1258
1259         /*
1260          * If we have successfully processed data from a previous fetch
1261          * attempt, only fetch the data we don't already have.
1262          */
1263         if (prev_posn>0) {
1264                 if (http_is_verbose)
1265                         fprintf(stderr,
1266                                 "Resuming fetch of object %s at byte %ld\n",
1267                                 hex, prev_posn);
1268                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1269                 range_header = curl_slist_append(range_header, range);
1270                 curl_easy_setopt(freq->slot->curl,
1271                                  CURLOPT_HTTPHEADER, range_header);
1272         }
1273
1274         return freq;
1275
1276 abort:
1277         free(freq->url);
1278         free(freq);
1279         return NULL;
1280 }
1281
1282 void process_http_object_request(struct http_object_request *freq)
1283 {
1284         if (freq->slot == NULL)
1285                 return;
1286         freq->curl_result = freq->slot->curl_result;
1287         freq->http_code = freq->slot->http_code;
1288         freq->slot = NULL;
1289 }
1290
1291 int finish_http_object_request(struct http_object_request *freq)
1292 {
1293         struct stat st;
1294
1295         close(freq->localfile);
1296         freq->localfile = -1;
1297
1298         process_http_object_request(freq);
1299
1300         if (freq->http_code == 416) {
1301                 warning("requested range invalid; we may already have all the data.");
1302         } else if (freq->curl_result != CURLE_OK) {
1303                 if (stat(freq->tmpfile, &st) == 0)
1304                         if (st.st_size == 0)
1305                                 unlink_or_warn(freq->tmpfile);
1306                 return -1;
1307         }
1308
1309         git_inflate_end(&freq->stream);
1310         git_SHA1_Final(freq->real_sha1, &freq->c);
1311         if (freq->zret != Z_STREAM_END) {
1312                 unlink_or_warn(freq->tmpfile);
1313                 return -1;
1314         }
1315         if (hashcmp(freq->sha1, freq->real_sha1)) {
1316                 unlink_or_warn(freq->tmpfile);
1317                 return -1;
1318         }
1319         freq->rename =
1320                 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1321
1322         return freq->rename;
1323 }
1324
1325 void abort_http_object_request(struct http_object_request *freq)
1326 {
1327         unlink_or_warn(freq->tmpfile);
1328
1329         release_http_object_request(freq);
1330 }
1331
1332 void release_http_object_request(struct http_object_request *freq)
1333 {
1334         if (freq->localfile != -1) {
1335                 close(freq->localfile);
1336                 freq->localfile = -1;
1337         }
1338         if (freq->url != NULL) {
1339                 free(freq->url);
1340                 freq->url = NULL;
1341         }
1342         if (freq->slot != NULL) {
1343                 freq->slot->callback_func = NULL;
1344                 freq->slot->callback_data = NULL;
1345                 release_active_slot(freq->slot);
1346                 freq->slot = NULL;
1347         }
1348 }