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 #if defined TIZEN_EXT
 115                         __connman_service_nameserver_remove(service,
 116                                                 dhcp->nameservers[i], false,
 117                                                 CONNMAN_IPCONFIG_TYPE_IPV4);
 118 #else
 119                         __connman_service_nameserver_remove(service,
 120                                                 dhcp->nameservers[i], false);
 121 #endif
 122                 }
 123         }
 124
 125         return true;
 126 }
 127
 128 /**
 129  * dhcp_invalidate: Invalidate an existing DHCP lease
 130  * @dhcp: pointer to the DHCP lease to invalidate.
 131  * @callback: flag indicating whether or not to invoke the client callback
 132  *            if present.
 133  *
 134  * Invalidates an existing DHCP lease, optionally invoking the client
 135  * callback. The caller may wish to avoid the client callback invocation
 136  * when the invocation of that callback might otherwise unnecessarily upset
 137  * service state due to the IP configuration change implied by this
 138  * invalidation.
 139  */
 140 static void dhcp_invalidate(struct connman_dhcp *dhcp, bool callback)
 141 {
 142         DBG("dhcp %p callback %u", dhcp, callback);
 143
 144         if (!dhcp)
 145                 return;
 146
 147         __connman_6to4_remove(dhcp->ipconfig);
 148
 149         if (!apply_dhcp_invalidate_on_network(dhcp))
 150                 return;
 151
 152         __connman_ipconfig_set_dhcp_address(dhcp->ipconfig,
 153                                 __connman_ipconfig_get_local(dhcp->ipconfig));
 154         DBG("last address %s",
 155                         __connman_ipconfig_get_dhcp_address(dhcp->ipconfig));
 156
 157         __connman_ipconfig_address_remove(dhcp->ipconfig);
 158
 159         __connman_ipconfig_set_local(dhcp->ipconfig, NULL);
 160         __connman_ipconfig_set_broadcast(dhcp->ipconfig, NULL);
 161         __connman_ipconfig_set_gateway(dhcp->ipconfig, NULL);
 162         __connman_ipconfig_set_prefixlen(dhcp->ipconfig, 0);
 163
 164         if (dhcp->callback && callback)
 165                 dhcp->callback(dhcp->ipconfig, dhcp->network,
 166                                                 false, dhcp->user_data);
 167 }
 168
 169 static void dhcp_valid(struct connman_dhcp *dhcp)
 170 {
 171         if (dhcp->callback)
 172                 dhcp->callback(dhcp->ipconfig, dhcp->network,
 173                                                 true, dhcp->user_data);
 174 }
 175
 176 static void dhcp_debug(const char *str, void *data)
 177 {
 178         connman_info("%s: %s", (const char *) data, str);
 179 }
 180
 181 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data);
 182 static void ipv4ll_available_cb(GDHCPClient *ipv4ll_client, gpointer user_data);
 183
 184 static int ipv4ll_start_client(struct connman_dhcp *dhcp)
 185 {
 186         GDHCPClient *ipv4ll_client;
 187         GDHCPClientError error;
 188         const char *hostname;
 189         int index;
 190         int err;
 191
 192         if (dhcp->ipv4ll_client)
 193                 return -EALREADY;
 194
 195         index = __connman_ipconfig_get_index(dhcp->ipconfig);
 196
 197         ipv4ll_client = g_dhcp_client_new(G_DHCP_IPV4LL, index, &error);
 198         if (error != G_DHCP_CLIENT_ERROR_NONE)
 199                 return -EINVAL;
 200
 201 #if !defined TIZEN_EXT
 202         if (getenv("CONNMAN_DHCP_DEBUG")) {
 203 #endif
 204                 dhcp->ipv4ll_debug_prefix = g_strdup_printf("IPv4LL index %d",
 205                                                         index);
 206                 g_dhcp_client_set_debug(ipv4ll_client, dhcp_debug,
 207                                         dhcp->ipv4ll_debug_prefix);
 208 #if !defined TIZEN_EXT
 209         }
 210 #endif
 211
 212         g_dhcp_client_set_id(ipv4ll_client);
 213
 214         if (dhcp->network) {
 215                 hostname = connman_utsname_get_hostname();
 216                 if (hostname)
 217                         g_dhcp_client_set_send(ipv4ll_client,
 218                                                 G_DHCP_HOST_NAME, hostname);
 219         }
 220
 221         g_dhcp_client_register_event(ipv4ll_client,
 222                         G_DHCP_CLIENT_EVENT_IPV4LL_LOST, ipv4ll_lost_cb, dhcp);
 223
 224         g_dhcp_client_register_event(ipv4ll_client,
 225                         G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE,
 226                                                 ipv4ll_available_cb, dhcp);
 227
 228         dhcp->ipv4ll_client = ipv4ll_client;
 229
 230         err = g_dhcp_client_start(dhcp->ipv4ll_client, NULL);
 231         if (err < 0) {
 232                 ipv4ll_stop_client(dhcp);
 233                 return err;
 234         }
 235
 236         ipv4ll_running = true;
 237         return 0;
 238 }
 239
 240 static gboolean dhcp_retry_cb(gpointer user_data)
 241 {
 242         struct connman_dhcp *dhcp = user_data;
 243
 244         dhcp->timeout = 0;
 245
 246         g_dhcp_client_start(dhcp->dhcp_client,
 247                         __connman_ipconfig_get_dhcp_address(dhcp->ipconfig));
 248
 249         return FALSE;
 250 }
 251
 252 static void no_lease_cb(GDHCPClient *dhcp_client, gpointer user_data)
 253 {
 254         struct connman_dhcp *dhcp = user_data;
 255         int err;
 256
 257         DBG("No lease available ipv4ll %d client %p", ipv4ll_running,
 258                 dhcp->ipv4ll_client);
 259
 260         dhcp->timeout = g_timeout_add_seconds(RATE_LIMIT_INTERVAL,
 261                                                 dhcp_retry_cb,
 262                                                 dhcp);
 263         if (ipv4ll_running)
 264                 return;
 265
 266         err = ipv4ll_start_client(dhcp);
 267         if (err < 0)
 268                 DBG("Cannot start ipv4ll client (%d/%s)", err, strerror(-err));
 269
 270         /* Only notify upper layer if we have a problem */
 271         dhcp_invalidate(dhcp, !ipv4ll_running);
 272 }
 273
 274 static void lease_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 275 {
 276         struct connman_dhcp *dhcp = user_data;
 277
 278         DBG("Lease lost");
 279
 280         /* Upper layer will decide what to do, e.g. nothing or retry. */
 281         dhcp_invalidate(dhcp, true);
 282 }
 283
 284 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 285 {
 286         struct connman_dhcp *dhcp = user_data;
 287
 288         DBG("Lease lost");
 289
 290         ipv4ll_stop_client(dhcp);
 291
 292         /*
 293          * Since we lost our IPv4LL configuration we might as notify
 294          * the upper layers.
 295          */
 296         dhcp_invalidate(dhcp, true);
 297 }
 298
 299 static bool compare_string_arrays(char **array_a, char **array_b)
 300 {
 301         int i;
 302
 303         if (!array_a || !array_b)
 304                 return false;
 305
 306         if (g_strv_length(array_a) != g_strv_length(array_b))
 307                 return false;
 308
 309         for (i = 0; array_a[i] &&
 310                              array_b[i]; i++) {
 311                 if (g_strcmp0(array_a[i], array_b[i]) != 0)
 312                         return false;
 313         }
 314
 315         return true;
 316 }
 317
 318 static bool apply_lease_available_on_network(GDHCPClient *dhcp_client,
 319                                                 struct connman_dhcp *dhcp)
 320 {
 321         char **nameservers, **timeservers, *pac = NULL;
 322         struct connman_service *service;
 323         GList *list, *option = NULL;
 324         int ns_entries;
 325         int i;
 326
 327         if (!dhcp->network)
 328                 return true;
 329
 330         service = connman_service_lookup_from_network(dhcp->network);
 331         if (!service) {
 332                 connman_error("Can not lookup service");
 333                 return false;
 334         }
 335
 336         option = g_dhcp_client_get_option(dhcp_client, 252);
 337         if (option)
 338                 pac = g_strdup(option->data);
 339
 340         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DNS_SERVER);
 341         ns_entries = g_list_length(option);
 342         nameservers = g_try_new0(char *, ns_entries + 1);
 343         if (nameservers) {
 344                 for (i = 0, list = option;list; list = list->next, i++)
 345                         nameservers[i] = g_strdup(list->data);
 346                 nameservers[ns_entries] = NULL;
 347         }
 348
 349         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DOMAIN_NAME);
 350         if (option)
 351                 __connman_service_set_domainname(service, option->data);
 352
 353         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_HOST_NAME);
 354         if (option)
 355                 __connman_service_set_hostname(service, option->data);
 356
 357         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_NTP_SERVER);
 358         ns_entries = g_list_length(option);
 359         timeservers = g_try_new0(char *, ns_entries + 1);
 360         if (timeservers) {
 361                 for (i = 0, list = option; list; list = list->next, i++)
 362                         timeservers[i] = g_strdup(list->data);
 363                 timeservers[ns_entries] = NULL;
 364         }
 365
 366         if (!compare_string_arrays(nameservers, dhcp->nameservers)) {
 367                 if (dhcp->nameservers) {
 368 #if defined TIZEN_EXT
 369                         for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 370                                 __connman_service_nameserver_remove(service,
 371                                                 dhcp->nameservers[i], false,
 372                                                 CONNMAN_IPCONFIG_TYPE_IPV4);
 373                         }
 374 #else
 375                         for (i = 0; dhcp->nameservers[i]; i++) {
 376                                 __connman_service_nameserver_remove(service,
 377                                                 dhcp->nameservers[i], false);
 378                         }
 379 #endif
 380                         g_strfreev(dhcp->nameservers);
 381                 }
 382
 383                 dhcp->nameservers = nameservers;
 384
 385                 for (i = 0; dhcp->nameservers && dhcp->nameservers[i]; i++) {
 386 #if defined TIZEN_EXT
 387                         __connman_service_nameserver_append(service,
 388                                                 dhcp->nameservers[i], false,
 389                                                 CONNMAN_IPCONFIG_TYPE_IPV4);
 390 #else
 391                         __connman_service_nameserver_append(service,
 392                                                 dhcp->nameservers[i], false);
 393 #endif
 394                 }
 395         } else {
 396                 g_strfreev(nameservers);
 397         }
 398
 399         if (!compare_string_arrays(timeservers, dhcp->timeservers)) {
 400                 if (dhcp->timeservers) {
 401                         for (i = 0; dhcp->timeservers[i]; i++) {
 402                                 __connman_service_timeserver_remove(service,
 403                                                         dhcp->timeservers[i]);
 404                         }
 405                         g_strfreev(dhcp->timeservers);
 406                 }
 407
 408                 dhcp->timeservers = timeservers;
 409
 410                 for (i = 0; dhcp->timeservers && dhcp->timeservers[i]; i++) {
 411                         __connman_service_timeserver_append(service,
 412                                                         dhcp->timeservers[i]);
 413                 }
 414         } else {
 415                 g_strfreev(timeservers);
 416         }
 417
 418         if (g_strcmp0(pac, dhcp->pac) != 0) {
 419                 g_free(dhcp->pac);
 420                 dhcp->pac = pac;
 421
 422                 __connman_ipconfig_set_proxy_autoconfig(dhcp->ipconfig,
 423                                                                 dhcp->pac);
 424         }
 425
 426         if (connman_setting_get_bool("Enable6to4"))
 427                 __connman_6to4_probe(service);
 428
 429         return true;
 430 }
 431
 432 static void lease_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 433 {
 434         struct connman_dhcp *dhcp = user_data;
 435         GList *option = NULL;
 436         char *address, *netmask = NULL, *gateway = NULL;
 437         const char *c_address, *c_gateway;
 438         unsigned char prefixlen, c_prefixlen;
 439         bool ip_change;
 440
 441         DBG("Lease available");
 442
 443         if (dhcp->ipv4ll_client) {
 444                 ipv4ll_stop_client(dhcp);
 445                 dhcp_invalidate(dhcp, false);
 446         }
 447
 448         c_address = __connman_ipconfig_get_local(dhcp->ipconfig);
 449         c_gateway = __connman_ipconfig_get_gateway(dhcp->ipconfig);
 450         c_prefixlen = __connman_ipconfig_get_prefixlen(dhcp->ipconfig);
 451
 452         address = g_dhcp_client_get_address(dhcp_client);
 453
 454         __connman_ipconfig_set_dhcp_address(dhcp->ipconfig, address);
 455         DBG("last address %s", address);
 456
 457         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_SUBNET);
 458         if (option)
 459                 netmask = g_strdup(option->data);
 460
 461         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_ROUTER);
 462         if (option)
 463                 gateway = g_strdup(option->data);
 464
 465         prefixlen = connman_ipaddress_calc_netmask_len(netmask);
 466         if (prefixlen == 255)
 467                 connman_warn("netmask: %s is invalid", netmask);
 468
 469         DBG("c_address %s", c_address);
 470
 471         if (g_strcmp0(address, c_address))
 472                 ip_change = true;
 473         else if (g_strcmp0(gateway, c_gateway))
 474                 ip_change = true;
 475         else if (prefixlen != c_prefixlen)
 476                 ip_change = true;
 477         else
 478                 ip_change = false;
 479
 480         __connman_ipconfig_set_method(dhcp->ipconfig,
 481                                                 CONNMAN_IPCONFIG_METHOD_DHCP);
 482         if (ip_change) {
 483                 __connman_ipconfig_set_local(dhcp->ipconfig, address);
 484                 __connman_ipconfig_set_prefixlen(dhcp->ipconfig, prefixlen);
 485                 __connman_ipconfig_set_gateway(dhcp->ipconfig, gateway);
 486         }
 487
 488         if (!apply_lease_available_on_network(dhcp_client, dhcp))
 489                 goto done;
 490
 491         if (ip_change)
 492                 dhcp_valid(dhcp);
 493
 494 done:
 495         g_free(address);
 496         g_free(netmask);
 497         g_free(gateway);
 498 }
 499
 500 static void ipv4ll_available_cb(GDHCPClient *ipv4ll_client, gpointer user_data)
 501 {
 502         struct connman_dhcp *dhcp = user_data;
 503                 char *address, *netmask;
 504                 unsigned char prefixlen;
 505
 506         DBG("IPV4LL available");
 507
 508         address = g_dhcp_client_get_address(ipv4ll_client);
 509         netmask = g_dhcp_client_get_netmask(ipv4ll_client);
 510
 511         prefixlen = connman_ipaddress_calc_netmask_len(netmask);
 512
 513         __connman_ipconfig_set_method(dhcp->ipconfig,
 514                                                 CONNMAN_IPCONFIG_METHOD_DHCP);
 515         __connman_ipconfig_set_local(dhcp->ipconfig, address);
 516         __connman_ipconfig_set_prefixlen(dhcp->ipconfig, prefixlen);
 517         __connman_ipconfig_set_gateway(dhcp->ipconfig, NULL);
 518
 519         dhcp_valid(dhcp);
 520
 521         g_free(address);
 522         g_free(netmask);
 523 }
 524
 525 static int dhcp_initialize(struct connman_dhcp *dhcp)
 526 {
 527         GDHCPClient *dhcp_client;
 528         GDHCPClientError error;
 529         int index;
 530
 531         DBG("dhcp %p", dhcp);
 532
 533         index = __connman_ipconfig_get_index(dhcp->ipconfig);
 534
 535         dhcp_client = g_dhcp_client_new(G_DHCP_IPV4, index, &error);
 536         if (error != G_DHCP_CLIENT_ERROR_NONE)
 537 #if defined TIZEN_EXT
 538         {
 539                 DBG("failed g_dhcp_client_new(%d), index(%d)", error, index);
 540 #endif
 541                 return -EINVAL;
 542 #if defined TIZEN_EXT
 543         }
 544 #endif
 545
 546 #if !defined TIZEN_EXT
 547         if (getenv("CONNMAN_DHCP_DEBUG")) {
 548 #endif
 549                 dhcp->dhcp_debug_prefix = g_strdup_printf("DHCP index %d",
 550                                                         index);
 551                 g_dhcp_client_set_debug(dhcp_client, dhcp_debug,
 552                                         dhcp->dhcp_debug_prefix);
 553 #if !defined TIZEN_EXT
 554         }
 555 #endif
 556
 557         g_dhcp_client_set_id(dhcp_client);
 558
 559         if (dhcp->network) {
 560                 struct connman_service *service;
 561                 const char *hostname;
 562
 563                 service = connman_service_lookup_from_network(dhcp->network);
 564
 565                 hostname = __connman_service_get_hostname(service);
 566                 if (!hostname)
 567                         hostname = connman_utsname_get_hostname();
 568
 569                 if (hostname)
 570                         g_dhcp_client_set_send(dhcp_client,
 571                                                 G_DHCP_HOST_NAME, hostname);
 572
 573                 g_dhcp_client_set_request(dhcp_client, G_DHCP_HOST_NAME);
 574                 g_dhcp_client_set_request(dhcp_client, G_DHCP_DNS_SERVER);
 575                 g_dhcp_client_set_request(dhcp_client, G_DHCP_DOMAIN_NAME);
 576                 g_dhcp_client_set_request(dhcp_client, G_DHCP_NTP_SERVER);
 577                 g_dhcp_client_set_request(dhcp_client, 252);
 578         }
 579
 580         g_dhcp_client_set_request(dhcp_client, G_DHCP_SUBNET);
 581         g_dhcp_client_set_request(dhcp_client, G_DHCP_ROUTER);
 582
 583         g_dhcp_client_register_event(dhcp_client,
 584                         G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE,
 585                                                 lease_available_cb, dhcp);
 586
 587         g_dhcp_client_register_event(dhcp_client,
 588                         G_DHCP_CLIENT_EVENT_LEASE_LOST, lease_lost_cb, dhcp);
 589
 590         g_dhcp_client_register_event(dhcp_client,
 591                         G_DHCP_CLIENT_EVENT_NO_LEASE, no_lease_cb, dhcp);
 592
 593         dhcp->dhcp_client = dhcp_client;
 594
 595         return 0;
 596 }
 597
 598 static int dhcp_release(struct connman_dhcp *dhcp)
 599 {
 600         DBG("dhcp %p", dhcp);
 601
 602         if (dhcp->timeout > 0) {
 603                 g_source_remove(dhcp->timeout);
 604                 dhcp->timeout = 0;
 605         }
 606
 607         if (dhcp->dhcp_client) {
 608                 g_dhcp_client_stop(dhcp->dhcp_client);
 609                 g_dhcp_client_unref(dhcp->dhcp_client);
 610         }
 611
 612         dhcp->dhcp_client = NULL;
 613
 614         g_free(dhcp->dhcp_debug_prefix);
 615         dhcp->dhcp_debug_prefix = NULL;
 616
 617         ipv4ll_stop_client(dhcp);
 618
 619         return 0;
 620 }
 621
 622 char *__connman_dhcp_get_server_address(struct connman_ipconfig *ipconfig)
 623 {
 624         struct connman_dhcp *dhcp;
 625
 626         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 627         if (!dhcp)
 628                 return NULL;
 629
 630         return g_dhcp_client_get_server_address(dhcp->dhcp_client);
 631 }
 632
 633 int __connman_dhcp_start(struct connman_ipconfig *ipconfig,
 634                         struct connman_network *network, dhcp_cb callback,
 635                         gpointer user_data)
 636 {
 637         const char *last_addr = NULL;
 638         struct connman_dhcp *dhcp;
 639         int err;
 640
 641         DBG("");
 642
 643         if (network) {
 644                 struct connman_service *service;
 645
 646                 service = connman_service_lookup_from_network(network);
 647                 if (!service)
 648                         return -EINVAL;
 649         }
 650
 651         last_addr = __connman_ipconfig_get_dhcp_address(ipconfig);
 652
 653         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 654         if (!dhcp) {
 655
 656                 dhcp = g_try_new0(struct connman_dhcp, 1);
 657                 if (!dhcp)
 658                         return -ENOMEM;
 659
 660                 dhcp->ipconfig = ipconfig;
 661                 __connman_ipconfig_ref(ipconfig);
 662
 663                 if (network) {
 664                         dhcp->network = network;
 665                         connman_network_ref(network);
 666                 }
 667
 668                 err = dhcp_initialize(dhcp);
 669
 670                 if (err < 0) {
 671                         if (network)
 672                                 connman_network_unref(network);
 673                         g_free(dhcp);
 674                         return err;
 675                 }
 676
 677                 g_hash_table_insert(ipconfig_table, ipconfig, dhcp);
 678         }
 679
 680         dhcp->callback = callback;
 681         dhcp->user_data = user_data;
 682
 683         return g_dhcp_client_start(dhcp->dhcp_client, last_addr);
 684 }
 685
 686 void __connman_dhcp_stop(struct connman_ipconfig *ipconfig)
 687 {
 688         struct connman_dhcp *dhcp;
 689
 690         DBG("ipconfig_table %p ipconfig %p", ipconfig_table, ipconfig);
 691
 692         if (!ipconfig_table)
 693                 return;
 694
 695         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 696         if (dhcp) {
 697                 g_hash_table_remove(ipconfig_table, ipconfig);
 698                 __connman_ipconfig_unref(ipconfig);
 699                 if (dhcp->network)
 700                         connman_network_unref(dhcp->network);
 701                 dhcp_release(dhcp);
 702                 dhcp_invalidate(dhcp, false);
 703                 dhcp_free(dhcp);
 704         }
 705 }
 706
 707 int __connman_dhcp_init(void)
 708 {
 709         DBG("");
 710
 711         ipconfig_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
 712                                                                 NULL, NULL);
 713
 714         return 0;
 715 }
 716
 717 void __connman_dhcp_cleanup(void)
 718 {
 719         DBG("");
 720
 721         g_hash_table_destroy(ipconfig_table);
 722         ipconfig_table = NULL;
 723
 724         dhcp_cleanup_random();
 725 }