src/dhcp.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2013  Intel Corporation. All rights reserved.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License version 2 as
   9  *  published by the Free Software Foundation.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25 #include <stdio.h>
  26 #include <errno.h>
  27 #include <string.h>
  28 #include <stdlib.h>
  29
  30 #include <connman/ipconfig.h>
  31 #include <include/setting.h>
  32
  33 #include <gdhcp/gdhcp.h>
  34
  35 #include <glib.h>
  36
  37 #include "connman.h"
  38
  39 #define RATE_LIMIT_INTERVAL     60      /* delay between successive attempts */
  40
  41 struct connman_dhcp {
  42         struct connman_ipconfig *ipconfig;
  43         struct connman_network *network;
  44         dhcp_cb callback;
  45         gpointer user_data;
  46
  47         char **nameservers;
  48         char **timeservers;
  49         char *pac;
  50
  51         unsigned int timeout;
  52
  53         GDHCPClient *ipv4ll_client;
  54         GDHCPClient *dhcp_client;
  55         char *ipv4ll_debug_prefix;
  56         char *dhcp_debug_prefix;
  57 };
  58
  59 static GHashTable *ipconfig_table;
  60 static bool ipv4ll_running;
  61
  62 static void dhcp_free(struct connman_dhcp *dhcp)
  63 {
  64         g_strfreev(dhcp->nameservers);
  65         g_strfreev(dhcp->timeservers);
  66         g_free(dhcp->pac);
  67
  68         dhcp->nameservers = NULL;
  69         dhcp->timeservers = NULL;
  70         dhcp->pac = NULL;
  71
  72         g_free(dhcp);
  73 }
  74
  75 static void ipv4ll_stop_client(struct connman_dhcp *dhcp)
  76 {
  77         if (!dhcp->ipv4ll_client)
  78                 return;
  79
  80         g_dhcp_client_stop(dhcp->ipv4ll_client);
  81         g_dhcp_client_unref(dhcp->ipv4ll_client);
  82         dhcp->ipv4ll_client = NULL;
  83         ipv4ll_running = false;
  84
  85         g_free(dhcp->ipv4ll_debug_prefix);
  86         dhcp->ipv4ll_debug_prefix = NULL;
  87 }
  88
  89 static bool apply_dhcp_invalidate_on_network(struct connman_dhcp *dhcp)
  90 {
  91         struct connman_service *service;
  92         int i;
  93
  94         if (!dhcp->network)
  95                 return true;
  96
  97         service = connman_service_lookup_from_network(dhcp->network);
  98         if (!service) {
  99                 connman_error("Can not lookup service");
 100                 return false;
 101         }
 102
 103         __connman_service_set_domainname(service, NULL);
 104         __connman_ipconfig_set_proxy_autoconfig(dhcp->ipconfig, NULL);
 105
 106         if (dhcp->timeservers) {
 107                 for (i = 0; dhcp->timeservers[i]; i++) {
 108                         __connman_service_timeserver_remove(service,
 109                                                         dhcp->timeservers[i]);
 110                 }
 111         }
 112         if (dhcp->nameservers) {
 113                 for (i = 0; dhcp->nameservers[i]; i++) {
 114                         __connman_service_nameserver_remove(service,
 115                                                 dhcp->nameservers[i], false);
 116                 }
 117         }
 118
 119         return true;
 120 }
 121
 122 /**
 123  * dhcp_invalidate: Invalidate an existing DHCP lease
 124  * @dhcp: pointer to the DHCP lease to invalidate.
 125  * @callback: flag indicating whether or not to invoke the client callback
 126  *            if present.
 127  *
 128  * Invalidates an existing DHCP lease, optionally invoking the client
 129  * callback. The caller may wish to avoid the client callback invocation
 130  * when the invocation of that callback might otherwise unnecessarily upset
 131  * service state due to the IP configuration change implied by this
 132  * invalidation.
 133  */
 134 static void dhcp_invalidate(struct connman_dhcp *dhcp, bool callback)
 135 {
 136         DBG("dhcp %p callback %u", dhcp, callback);
 137
 138         if (!dhcp)
 139                 return;
 140
 141         __connman_6to4_remove(dhcp->ipconfig);
 142
 143         if (!apply_dhcp_invalidate_on_network(dhcp))
 144                 return;
 145
 146         __connman_ipconfig_set_dhcp_address(dhcp->ipconfig,
 147                                 __connman_ipconfig_get_local(dhcp->ipconfig));
 148         DBG("last address %s",
 149                         __connman_ipconfig_get_dhcp_address(dhcp->ipconfig));
 150
 151         __connman_ipconfig_address_remove(dhcp->ipconfig);
 152
 153         __connman_ipconfig_set_local(dhcp->ipconfig, NULL);
 154         __connman_ipconfig_set_broadcast(dhcp->ipconfig, NULL);
 155         __connman_ipconfig_set_gateway(dhcp->ipconfig, NULL);
 156         __connman_ipconfig_set_prefixlen(dhcp->ipconfig, 0);
 157
 158         if (dhcp->callback && callback)
 159                 dhcp->callback(dhcp->ipconfig, dhcp->network,
 160                                                 false, dhcp->user_data);
 161 }
 162
 163 static void dhcp_valid(struct connman_dhcp *dhcp)
 164 {
 165         if (dhcp->callback)
 166                 dhcp->callback(dhcp->ipconfig, dhcp->network,
 167                                                 true, dhcp->user_data);
 168 }
 169
 170 static void dhcp_debug(const char *str, void *data)
 171 {
 172         connman_info("%s: %s", (const char *) data, str);
 173 }
 174
 175 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data);
 176 static void ipv4ll_available_cb(GDHCPClient *ipv4ll_client, gpointer user_data);
 177
 178 static int ipv4ll_start_client(struct connman_dhcp *dhcp)
 179 {
 180         GDHCPClient *ipv4ll_client;
 181         GDHCPClientError error;
 182         const char *hostname;
 183         int index;
 184         int err;
 185
 186         if (dhcp->ipv4ll_client)
 187                 return -EALREADY;
 188
 189         index = __connman_ipconfig_get_index(dhcp->ipconfig);
 190
 191         ipv4ll_client = g_dhcp_client_new(G_DHCP_IPV4LL, index, &error);
 192         if (error != G_DHCP_CLIENT_ERROR_NONE)
 193                 return -EINVAL;
 194
 195         if (getenv("CONNMAN_DHCP_DEBUG")) {
 196                 dhcp->ipv4ll_debug_prefix = g_strdup_printf("IPv4LL index %d",
 197                                                         index);
 198                 g_dhcp_client_set_debug(ipv4ll_client, dhcp_debug,
 199                                         dhcp->ipv4ll_debug_prefix);
 200         }
 201
 202         g_dhcp_client_set_id(ipv4ll_client);
 203
 204         if (dhcp->network) {
 205                 hostname = connman_utsname_get_hostname();
 206                 if (hostname)
 207                         g_dhcp_client_set_send(ipv4ll_client,
 208                                                 G_DHCP_HOST_NAME, hostname);
 209         }
 210
 211         g_dhcp_client_register_event(ipv4ll_client,
 212                         G_DHCP_CLIENT_EVENT_IPV4LL_LOST, ipv4ll_lost_cb, dhcp);
 213
 214         g_dhcp_client_register_event(ipv4ll_client,
 215                         G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE,
 216                                                 ipv4ll_available_cb, dhcp);
 217
 218         dhcp->ipv4ll_client = ipv4ll_client;
 219
 220         err = g_dhcp_client_start(dhcp->ipv4ll_client, NULL);
 221         if (err < 0) {
 222                 ipv4ll_stop_client(dhcp);
 223                 return err;
 224         }
 225
 226         ipv4ll_running = true;
 227         return 0;
 228 }
 229
 230 static gboolean dhcp_retry_cb(gpointer user_data)
 231 {
 232         struct connman_dhcp *dhcp = user_data;
 233
 234         dhcp->timeout = 0;
 235
 236         g_dhcp_client_start(dhcp->dhcp_client,
 237                         __connman_ipconfig_get_dhcp_address(dhcp->ipconfig));
 238
 239         return FALSE;
 240 }
 241
 242 static void no_lease_cb(GDHCPClient *dhcp_client, gpointer user_data)
 243 {
 244         struct connman_dhcp *dhcp = user_data;
 245         int err;
 246
 247         DBG("No lease available ipv4ll %d client %p", ipv4ll_running,
 248                 dhcp->ipv4ll_client);
 249
 250         dhcp->timeout = g_timeout_add_seconds(RATE_LIMIT_INTERVAL,
 251                                                 dhcp_retry_cb,
 252                                                 dhcp);
 253         if (ipv4ll_running)
 254                 return;
 255
 256         err = ipv4ll_start_client(dhcp);
 257         if (err < 0)
 258                 DBG("Cannot start ipv4ll client (%d/%s)", err, strerror(-err));
 259
 260         /* Only notify upper layer if we have a problem */
 261         dhcp_invalidate(dhcp, !ipv4ll_running);
 262 }
 263
 264 static void lease_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 265 {
 266         struct connman_dhcp *dhcp = user_data;
 267
 268         DBG("Lease lost");
 269
 270         /* Upper layer will decide what to do, e.g. nothing or retry. */
 271         dhcp_invalidate(dhcp, true);
 272 }
 273
 274 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 275 {
 276         struct connman_dhcp *dhcp = user_data;
 277
 278         DBG("Lease lost");
 279
 280         ipv4ll_stop_client(dhcp);
 281
 282         /*
 283          * Since we lost our IPv4LL configuration we might as notify
 284          * the upper layers.
 285          */
 286         dhcp_invalidate(dhcp, true);
 287 }
 288
 289 static bool compare_string_arrays(char **array_a, char **array_b)
 290 {
 291         int i;
 292
 293         if (!array_a || !array_b)
 294                 return false;
 295
 296         if (g_strv_length(array_a) != g_strv_length(array_b))
 297                 return false;
 298
 299         for (i = 0; array_a[i] &&
 300                              array_b[i]; i++) {
 301                 if (g_strcmp0(array_a[i], array_b[i]) != 0)
 302                         return false;
 303         }
 304
 305         return true;
 306 }
 307
 308 static bool apply_lease_available_on_network(GDHCPClient *dhcp_client,
 309                                                 struct connman_dhcp *dhcp)
 310 {
 311         char **nameservers, **timeservers, *pac = NULL;
 312         struct connman_service *service;
 313         GList *list, *option = NULL;
 314         int ns_entries;
 315         int i;
 316
 317         if (!dhcp->network)
 318                 return true;
 319
 320         service = connman_service_lookup_from_network(dhcp->network);
 321         if (!service) {
 322                 connman_error("Can not lookup service");
 323                 return false;
 324         }
 325
 326         option = g_dhcp_client_get_option(dhcp_client, 252);
 327         if (option)
 328                 pac = g_strdup(option->data);
 329
 330         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DNS_SERVER);
 331         ns_entries = g_list_length(option);
 332         nameservers = g_try_new0(char *, ns_entries + 1);
 333         if (nameservers) {
 334                 for (i = 0, list = option;list; list = list->next, i++)
 335                         nameservers[i] = g_strdup(list->data);
 336                 nameservers[ns_entries] = NULL;
 337         }
 338
 339         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DOMAIN_NAME);
 340         if (option)
 341                 __connman_service_set_domainname(service, option->data);
 342
 343         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_HOST_NAME);
 344         if (option)
 345                 __connman_service_set_hostname(service, option->data);
 346
 347         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_NTP_SERVER);
 348         ns_entries = g_list_length(option);
 349         timeservers = g_try_new0(char *, ns_entries + 1);
 350         if (timeservers) {
 351                 for (i = 0, list = option; list; list = list->next, i++)
 352                         timeservers[i] = g_strdup(list->data);
 353                 timeservers[ns_entries] = NULL;
 354         }
 355
 356         if (!compare_string_arrays(nameservers, dhcp->nameservers)) {
 357                 if (dhcp->nameservers) {
 358                         for (i = 0; dhcp->nameservers[i]; i++) {
 359                                 __connman_service_nameserver_remove(service,
 360                                                 dhcp->nameservers[i], false);
 361                         }
 362                         g_strfreev(dhcp->nameservers);
 363                 }
 364
 365                 dhcp->nameservers = nameservers;
 366
 367                 for (i = 0; dhcp->nameservers && dhcp->nameservers[i]; i++) {
 368                         __connman_service_nameserver_append(service,
 369                                                 dhcp->nameservers[i], false);
 370                 }
 371         } else {
 372                 g_strfreev(nameservers);
 373         }
 374
 375         if (!compare_string_arrays(timeservers, dhcp->timeservers)) {
 376                 if (dhcp->timeservers) {
 377                         for (i = 0; dhcp->timeservers[i]; i++) {
 378                                 __connman_service_timeserver_remove(service,
 379                                                         dhcp->timeservers[i]);
 380                         }
 381                         g_strfreev(dhcp->timeservers);
 382                 }
 383
 384                 dhcp->timeservers = timeservers;
 385
 386                 for (i = 0; dhcp->timeservers && dhcp->timeservers[i]; i++) {
 387                         __connman_service_timeserver_append(service,
 388                                                         dhcp->timeservers[i]);
 389                 }
 390         } else {
 391                 g_strfreev(timeservers);
 392         }
 393
 394         if (g_strcmp0(pac, dhcp->pac) != 0) {
 395                 g_free(dhcp->pac);
 396                 dhcp->pac = pac;
 397
 398                 __connman_ipconfig_set_proxy_autoconfig(dhcp->ipconfig,
 399                                                                 dhcp->pac);
 400         }
 401
 402         if (connman_setting_get_bool("Enable6to4"))
 403                 __connman_6to4_probe(service);
 404
 405         return true;
 406 }
 407
 408 static void lease_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 409 {
 410         struct connman_dhcp *dhcp = user_data;
 411         GList *option = NULL;
 412         char *address, *netmask = NULL, *gateway = NULL;
 413         const char *c_address, *c_gateway;
 414         unsigned char prefixlen, c_prefixlen;
 415         bool ip_change;
 416
 417         DBG("Lease available");
 418
 419         if (dhcp->ipv4ll_client) {
 420                 ipv4ll_stop_client(dhcp);
 421                 dhcp_invalidate(dhcp, false);
 422         }
 423
 424         c_address = __connman_ipconfig_get_local(dhcp->ipconfig);
 425         c_gateway = __connman_ipconfig_get_gateway(dhcp->ipconfig);
 426         c_prefixlen = __connman_ipconfig_get_prefixlen(dhcp->ipconfig);
 427
 428         address = g_dhcp_client_get_address(dhcp_client);
 429
 430         __connman_ipconfig_set_dhcp_address(dhcp->ipconfig, address);
 431         DBG("last address %s", address);
 432
 433         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_SUBNET);
 434         if (option)
 435                 netmask = g_strdup(option->data);
 436
 437         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_ROUTER);
 438         if (option)
 439                 gateway = g_strdup(option->data);
 440
 441         prefixlen = connman_ipaddress_calc_netmask_len(netmask);
 442         if (prefixlen == 255)
 443                 connman_warn("netmask: %s is invalid", netmask);
 444
 445         DBG("c_address %s", c_address);
 446
 447         if (g_strcmp0(address, c_address))
 448                 ip_change = true;
 449         else if (g_strcmp0(gateway, c_gateway))
 450                 ip_change = true;
 451         else if (prefixlen != c_prefixlen)
 452                 ip_change = true;
 453         else
 454                 ip_change = false;
 455
 456         __connman_ipconfig_set_method(dhcp->ipconfig,
 457                                                 CONNMAN_IPCONFIG_METHOD_DHCP);
 458         if (ip_change) {
 459                 __connman_ipconfig_set_local(dhcp->ipconfig, address);
 460                 __connman_ipconfig_set_prefixlen(dhcp->ipconfig, prefixlen);
 461                 __connman_ipconfig_set_gateway(dhcp->ipconfig, gateway);
 462         }
 463
 464         if (!apply_lease_available_on_network(dhcp_client, dhcp))
 465                 return;
 466
 467         if (ip_change)
 468                 dhcp_valid(dhcp);
 469
 470         g_free(address);
 471         g_free(netmask);
 472         g_free(gateway);
 473 }
 474
 475 static void ipv4ll_available_cb(GDHCPClient *ipv4ll_client, gpointer user_data)
 476 {
 477         struct connman_dhcp *dhcp = user_data;
 478         char *address, *netmask;
 479         unsigned char prefixlen;
 480
 481         DBG("IPV4LL available");
 482
 483         address = g_dhcp_client_get_address(ipv4ll_client);
 484         netmask = g_dhcp_client_get_netmask(ipv4ll_client);
 485
 486         prefixlen = connman_ipaddress_calc_netmask_len(netmask);
 487
 488         __connman_ipconfig_set_method(dhcp->ipconfig,
 489                                                 CONNMAN_IPCONFIG_METHOD_DHCP);
 490         __connman_ipconfig_set_local(dhcp->ipconfig, address);
 491         __connman_ipconfig_set_prefixlen(dhcp->ipconfig, prefixlen);
 492         __connman_ipconfig_set_gateway(dhcp->ipconfig, NULL);
 493
 494         dhcp_valid(dhcp);
 495
 496         g_free(address);
 497         g_free(netmask);
 498 }
 499
 500 static int dhcp_initialize(struct connman_dhcp *dhcp)
 501 {
 502         GDHCPClient *dhcp_client;
 503         GDHCPClientError error;
 504         int index;
 505
 506         DBG("dhcp %p", dhcp);
 507
 508         index = __connman_ipconfig_get_index(dhcp->ipconfig);
 509
 510         dhcp_client = g_dhcp_client_new(G_DHCP_IPV4, index, &error);
 511         if (error != G_DHCP_CLIENT_ERROR_NONE)
 512                 return -EINVAL;
 513
 514         if (getenv("CONNMAN_DHCP_DEBUG")) {
 515                 dhcp->dhcp_debug_prefix = g_strdup_printf("DHCP index %d",
 516                                                         index);
 517                 g_dhcp_client_set_debug(dhcp_client, dhcp_debug,
 518                                         dhcp->dhcp_debug_prefix);
 519         }
 520
 521         g_dhcp_client_set_id(dhcp_client);
 522
 523         if (dhcp->network) {
 524                 struct connman_service *service;
 525                 const char *hostname;
 526
 527                 service = connman_service_lookup_from_network(dhcp->network);
 528
 529                 hostname = __connman_service_get_hostname(service);
 530                 if (!hostname)
 531                         hostname = connman_utsname_get_hostname();
 532
 533                 if (hostname)
 534                         g_dhcp_client_set_send(dhcp_client,
 535                                                 G_DHCP_HOST_NAME, hostname);
 536
 537                 g_dhcp_client_set_request(dhcp_client, G_DHCP_HOST_NAME);
 538                 g_dhcp_client_set_request(dhcp_client, G_DHCP_DNS_SERVER);
 539                 g_dhcp_client_set_request(dhcp_client, G_DHCP_DOMAIN_NAME);
 540                 g_dhcp_client_set_request(dhcp_client, G_DHCP_NTP_SERVER);
 541                 g_dhcp_client_set_request(dhcp_client, 252);
 542         }
 543
 544         g_dhcp_client_set_request(dhcp_client, G_DHCP_SUBNET);
 545         g_dhcp_client_set_request(dhcp_client, G_DHCP_ROUTER);
 546
 547         g_dhcp_client_register_event(dhcp_client,
 548                         G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE,
 549                                                 lease_available_cb, dhcp);
 550
 551         g_dhcp_client_register_event(dhcp_client,
 552                         G_DHCP_CLIENT_EVENT_LEASE_LOST, lease_lost_cb, dhcp);
 553
 554         g_dhcp_client_register_event(dhcp_client,
 555                         G_DHCP_CLIENT_EVENT_NO_LEASE, no_lease_cb, dhcp);
 556
 557         dhcp->dhcp_client = dhcp_client;
 558
 559         return 0;
 560 }
 561
 562 static int dhcp_release(struct connman_dhcp *dhcp)
 563 {
 564         DBG("dhcp %p", dhcp);
 565
 566         if (dhcp->timeout > 0) {
 567                 g_source_remove(dhcp->timeout);
 568                 dhcp->timeout = 0;
 569         }
 570
 571         if (dhcp->dhcp_client) {
 572                 g_dhcp_client_stop(dhcp->dhcp_client);
 573                 g_dhcp_client_unref(dhcp->dhcp_client);
 574         }
 575
 576         dhcp->dhcp_client = NULL;
 577
 578         g_free(dhcp->dhcp_debug_prefix);
 579         dhcp->dhcp_debug_prefix = NULL;
 580
 581         ipv4ll_stop_client(dhcp);
 582
 583         return 0;
 584 }
 585
 586 char *__connman_dhcp_get_server_address(struct connman_ipconfig *ipconfig)
 587 {
 588         struct connman_dhcp *dhcp;
 589
 590         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 591         if (!dhcp)
 592                 return NULL;
 593
 594         return g_dhcp_client_get_server_address(dhcp->dhcp_client);
 595 }
 596
 597 int __connman_dhcp_start(struct connman_ipconfig *ipconfig,
 598                         struct connman_network *network, dhcp_cb callback,
 599                         gpointer user_data)
 600 {
 601         const char *last_addr = NULL;
 602         struct connman_dhcp *dhcp;
 603         int err;
 604
 605         DBG("");
 606
 607         if (network) {
 608                 struct connman_service *service;
 609
 610                 service = connman_service_lookup_from_network(network);
 611                 if (!service)
 612                         return -EINVAL;
 613         }
 614
 615         last_addr = __connman_ipconfig_get_dhcp_address(ipconfig);
 616
 617         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 618         if (!dhcp) {
 619
 620                 dhcp = g_try_new0(struct connman_dhcp, 1);
 621                 if (!dhcp)
 622                         return -ENOMEM;
 623
 624                 dhcp->ipconfig = ipconfig;
 625                 __connman_ipconfig_ref(ipconfig);
 626
 627                 if (network) {
 628                         dhcp->network = network;
 629                         connman_network_ref(network);
 630                 }
 631
 632                 err = dhcp_initialize(dhcp);
 633
 634                 if (err < 0) {
 635                         if (network)
 636                                 connman_network_unref(network);
 637                         g_free(dhcp);
 638                         return err;
 639                 }
 640
 641                 g_hash_table_insert(ipconfig_table, ipconfig, dhcp);
 642         }
 643
 644         dhcp->callback = callback;
 645         dhcp->user_data = user_data;
 646
 647         return g_dhcp_client_start(dhcp->dhcp_client, last_addr);
 648 }
 649
 650 void __connman_dhcp_stop(struct connman_ipconfig *ipconfig)
 651 {
 652         struct connman_dhcp *dhcp;
 653
 654         DBG("ipconfig_table %p ipconfig %p", ipconfig_table, ipconfig);
 655
 656         if (!ipconfig_table)
 657                 return;
 658
 659         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 660         if (dhcp) {
 661                 g_hash_table_remove(ipconfig_table, ipconfig);
 662                 __connman_ipconfig_unref(ipconfig);
 663                 if (dhcp->network)
 664                         connman_network_unref(dhcp->network);
 665                 dhcp_release(dhcp);
 666                 dhcp_invalidate(dhcp, false);
 667                 dhcp_free(dhcp);
 668         }
 669 }
 670
 671 int __connman_dhcp_init(void)
 672 {
 673         DBG("");
 674
 675         ipconfig_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
 676                                                                 NULL, NULL);
 677
 678         return 0;
 679 }
 680
 681 void __connman_dhcp_cleanup(void)
 682 {
 683         DBG("");
 684
 685         g_hash_table_destroy(ipconfig_table);
 686         ipconfig_table = NULL;
 687
 688         dhcp_cleanup_random();
 689 }