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 !defined TIZEN_EXT
 196         if (getenv("CONNMAN_DHCP_DEBUG")) {
 197 #endif
 198                 dhcp->ipv4ll_debug_prefix = g_strdup_printf("IPv4LL index %d",
 199                                                         index);
 200                 g_dhcp_client_set_debug(ipv4ll_client, dhcp_debug,
 201                                         dhcp->ipv4ll_debug_prefix);
 202 #if !defined TIZEN_EXT
 203         }
 204 #endif
 205
 206         g_dhcp_client_set_id(ipv4ll_client);
 207
 208         if (dhcp->network) {
 209                 hostname = connman_utsname_get_hostname();
 210                 if (hostname)
 211                         g_dhcp_client_set_send(ipv4ll_client,
 212                                                 G_DHCP_HOST_NAME, hostname);
 213         }
 214
 215         g_dhcp_client_register_event(ipv4ll_client,
 216                         G_DHCP_CLIENT_EVENT_IPV4LL_LOST, ipv4ll_lost_cb, dhcp);
 217
 218         g_dhcp_client_register_event(ipv4ll_client,
 219                         G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE,
 220                                                 ipv4ll_available_cb, dhcp);
 221
 222         dhcp->ipv4ll_client = ipv4ll_client;
 223
 224         err = g_dhcp_client_start(dhcp->ipv4ll_client, NULL);
 225         if (err < 0) {
 226                 ipv4ll_stop_client(dhcp);
 227                 return err;
 228         }
 229
 230         ipv4ll_running = true;
 231         return 0;
 232 }
 233
 234 static gboolean dhcp_retry_cb(gpointer user_data)
 235 {
 236         struct connman_dhcp *dhcp = user_data;
 237
 238         dhcp->timeout = 0;
 239
 240         g_dhcp_client_start(dhcp->dhcp_client,
 241                         __connman_ipconfig_get_dhcp_address(dhcp->ipconfig));
 242
 243         return FALSE;
 244 }
 245
 246 static void no_lease_cb(GDHCPClient *dhcp_client, gpointer user_data)
 247 {
 248         struct connman_dhcp *dhcp = user_data;
 249         int err;
 250
 251         DBG("No lease available ipv4ll %d client %p", ipv4ll_running,
 252                 dhcp->ipv4ll_client);
 253
 254         dhcp->timeout = g_timeout_add_seconds(RATE_LIMIT_INTERVAL,
 255                                                 dhcp_retry_cb,
 256                                                 dhcp);
 257         if (ipv4ll_running)
 258                 return;
 259
 260         err = ipv4ll_start_client(dhcp);
 261         if (err < 0)
 262                 DBG("Cannot start ipv4ll client (%d/%s)", err, strerror(-err));
 263
 264         /* Only notify upper layer if we have a problem */
 265         dhcp_invalidate(dhcp, !ipv4ll_running);
 266 }
 267
 268 static void lease_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 269 {
 270         struct connman_dhcp *dhcp = user_data;
 271
 272         DBG("Lease lost");
 273
 274         /* Upper layer will decide what to do, e.g. nothing or retry. */
 275         dhcp_invalidate(dhcp, true);
 276 }
 277
 278 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 279 {
 280         struct connman_dhcp *dhcp = user_data;
 281
 282         DBG("Lease lost");
 283
 284         ipv4ll_stop_client(dhcp);
 285
 286         /*
 287          * Since we lost our IPv4LL configuration we might as notify
 288          * the upper layers.
 289          */
 290         dhcp_invalidate(dhcp, true);
 291 }
 292
 293 static bool compare_string_arrays(char **array_a, char **array_b)
 294 {
 295         int i;
 296
 297         if (!array_a || !array_b)
 298                 return false;
 299
 300         if (g_strv_length(array_a) != g_strv_length(array_b))
 301                 return false;
 302
 303         for (i = 0; array_a[i] &&
 304                              array_b[i]; i++) {
 305                 if (g_strcmp0(array_a[i], array_b[i]) != 0)
 306                         return false;
 307         }
 308
 309         return true;
 310 }
 311
 312 static bool apply_lease_available_on_network(GDHCPClient *dhcp_client,
 313                                                 struct connman_dhcp *dhcp)
 314 {
 315         char **nameservers, **timeservers, *pac = NULL;
 316         struct connman_service *service;
 317         GList *list, *option = NULL;
 318         int ns_entries;
 319         int i;
 320
 321         if (!dhcp->network)
 322                 return true;
 323
 324         service = connman_service_lookup_from_network(dhcp->network);
 325         if (!service) {
 326                 connman_error("Can not lookup service");
 327                 return false;
 328         }
 329
 330         option = g_dhcp_client_get_option(dhcp_client, 252);
 331         if (option)
 332                 pac = g_strdup(option->data);
 333
 334         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DNS_SERVER);
 335         ns_entries = g_list_length(option);
 336         nameservers = g_try_new0(char *, ns_entries + 1);
 337         if (nameservers) {
 338                 for (i = 0, list = option;list; list = list->next, i++)
 339                         nameservers[i] = g_strdup(list->data);
 340                 nameservers[ns_entries] = NULL;
 341         }
 342
 343         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DOMAIN_NAME);
 344         if (option)
 345                 __connman_service_set_domainname(service, option->data);
 346
 347         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_HOST_NAME);
 348         if (option)
 349                 __connman_service_set_hostname(service, option->data);
 350
 351         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_NTP_SERVER);
 352         ns_entries = g_list_length(option);
 353         timeservers = g_try_new0(char *, ns_entries + 1);
 354         if (timeservers) {
 355                 for (i = 0, list = option; list; list = list->next, i++)
 356                         timeservers[i] = g_strdup(list->data);
 357                 timeservers[ns_entries] = NULL;
 358         }
 359
 360         if (!compare_string_arrays(nameservers, dhcp->nameservers)) {
 361                 if (dhcp->nameservers) {
 362                         for (i = 0; dhcp->nameservers[i]; i++) {
 363                                 __connman_service_nameserver_remove(service,
 364                                                 dhcp->nameservers[i], false);
 365                         }
 366                         g_strfreev(dhcp->nameservers);
 367                 }
 368
 369                 dhcp->nameservers = nameservers;
 370
 371                 for (i = 0; dhcp->nameservers && dhcp->nameservers[i]; i++) {
 372                         __connman_service_nameserver_append(service,
 373                                                 dhcp->nameservers[i], false);
 374                 }
 375         } else {
 376                 g_strfreev(nameservers);
 377         }
 378
 379         if (!compare_string_arrays(timeservers, dhcp->timeservers)) {
 380                 if (dhcp->timeservers) {
 381                         for (i = 0; dhcp->timeservers[i]; i++) {
 382                                 __connman_service_timeserver_remove(service,
 383                                                         dhcp->timeservers[i]);
 384                         }
 385                         g_strfreev(dhcp->timeservers);
 386                 }
 387
 388                 dhcp->timeservers = timeservers;
 389
 390                 for (i = 0; dhcp->timeservers && dhcp->timeservers[i]; i++) {
 391                         __connman_service_timeserver_append(service,
 392                                                         dhcp->timeservers[i]);
 393                 }
 394         } else {
 395                 g_strfreev(timeservers);
 396         }
 397
 398         if (g_strcmp0(pac, dhcp->pac) != 0) {
 399                 g_free(dhcp->pac);
 400                 dhcp->pac = pac;
 401
 402                 __connman_ipconfig_set_proxy_autoconfig(dhcp->ipconfig,
 403                                                                 dhcp->pac);
 404         }
 405
 406         if (connman_setting_get_bool("Enable6to4"))
 407                 __connman_6to4_probe(service);
 408
 409         return true;
 410 }
 411
 412 static void lease_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 413 {
 414         struct connman_dhcp *dhcp = user_data;
 415         GList *option = NULL;
 416         char *address, *netmask = NULL, *gateway = NULL;
 417         const char *c_address, *c_gateway;
 418         unsigned char prefixlen, c_prefixlen;
 419         bool ip_change;
 420
 421         DBG("Lease available");
 422
 423         if (dhcp->ipv4ll_client) {
 424                 ipv4ll_stop_client(dhcp);
 425                 dhcp_invalidate(dhcp, false);
 426         }
 427
 428         c_address = __connman_ipconfig_get_local(dhcp->ipconfig);
 429         c_gateway = __connman_ipconfig_get_gateway(dhcp->ipconfig);
 430         c_prefixlen = __connman_ipconfig_get_prefixlen(dhcp->ipconfig);
 431
 432         address = g_dhcp_client_get_address(dhcp_client);
 433
 434         __connman_ipconfig_set_dhcp_address(dhcp->ipconfig, address);
 435         DBG("last address %s", address);
 436
 437         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_SUBNET);
 438         if (option)
 439                 netmask = g_strdup(option->data);
 440
 441         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_ROUTER);
 442         if (option)
 443                 gateway = g_strdup(option->data);
 444
 445         prefixlen = connman_ipaddress_calc_netmask_len(netmask);
 446         if (prefixlen == 255)
 447                 connman_warn("netmask: %s is invalid", netmask);
 448
 449         DBG("c_address %s", c_address);
 450
 451         if (g_strcmp0(address, c_address))
 452                 ip_change = true;
 453         else if (g_strcmp0(gateway, c_gateway))
 454                 ip_change = true;
 455         else if (prefixlen != c_prefixlen)
 456                 ip_change = true;
 457         else
 458                 ip_change = false;
 459
 460         __connman_ipconfig_set_method(dhcp->ipconfig,
 461                                                 CONNMAN_IPCONFIG_METHOD_DHCP);
 462         if (ip_change) {
 463                 __connman_ipconfig_set_local(dhcp->ipconfig, address);
 464                 __connman_ipconfig_set_prefixlen(dhcp->ipconfig, prefixlen);
 465                 __connman_ipconfig_set_gateway(dhcp->ipconfig, gateway);
 466         }
 467
 468         if (!apply_lease_available_on_network(dhcp_client, dhcp))
 469                 goto done;
 470
 471         if (ip_change)
 472                 dhcp_valid(dhcp);
 473
 474 done:
 475         g_free(address);
 476         g_free(netmask);
 477         g_free(gateway);
 478 }
 479
 480 static void ipv4ll_available_cb(GDHCPClient *ipv4ll_client, gpointer user_data)
 481 {
 482         struct connman_dhcp *dhcp = user_data;
 483 #if !defined TIZEN_EXT
 484                 char *address, *netmask;
 485                 unsigned char prefixlen;
 486 #endif
 487
 488         DBG("IPV4LL available");
 489
 490 #if defined TIZEN_EXT
 491                 /*
 492                  * Description: When DHCP is failed,
 493                  *               most of normal users cannot understand auto-generated IP
 494                  *              (IPV4 link local) and serious troubles to make Internet connection.
 495                  */
 496                 dhcp_invalidate(dhcp, true);
 497
 498                 connman_network_set_error(dhcp->network,
 499                                         CONNMAN_NETWORK_ERROR_DHCP_FAIL);
 500 #else
 501         address = g_dhcp_client_get_address(ipv4ll_client);
 502         netmask = g_dhcp_client_get_netmask(ipv4ll_client);
 503
 504         prefixlen = connman_ipaddress_calc_netmask_len(netmask);
 505
 506         __connman_ipconfig_set_method(dhcp->ipconfig,
 507                                                 CONNMAN_IPCONFIG_METHOD_DHCP);
 508         __connman_ipconfig_set_local(dhcp->ipconfig, address);
 509         __connman_ipconfig_set_prefixlen(dhcp->ipconfig, prefixlen);
 510         __connman_ipconfig_set_gateway(dhcp->ipconfig, NULL);
 511
 512         dhcp_valid(dhcp);
 513
 514         g_free(address);
 515         g_free(netmask);
 516 #endif
 517 }
 518
 519 static int dhcp_initialize(struct connman_dhcp *dhcp)
 520 {
 521         GDHCPClient *dhcp_client;
 522         GDHCPClientError error;
 523         int index;
 524
 525         DBG("dhcp %p", dhcp);
 526
 527         index = __connman_ipconfig_get_index(dhcp->ipconfig);
 528
 529         dhcp_client = g_dhcp_client_new(G_DHCP_IPV4, index, &error);
 530         if (error != G_DHCP_CLIENT_ERROR_NONE)
 531 #if defined TIZEN_EXT
 532         {
 533                 DBG("failed g_dhcp_client_new(%d), index(%d)", error, index);
 534 #endif
 535                 return -EINVAL;
 536 #if defined TIZEN_EXT
 537         }
 538 #endif
 539
 540 #if !defined TIZEN_EXT
 541         if (getenv("CONNMAN_DHCP_DEBUG")) {
 542 #endif
 543                 dhcp->dhcp_debug_prefix = g_strdup_printf("DHCP index %d",
 544                                                         index);
 545                 g_dhcp_client_set_debug(dhcp_client, dhcp_debug,
 546                                         dhcp->dhcp_debug_prefix);
 547 #if !defined TIZEN_EXT
 548         }
 549 #endif
 550
 551         g_dhcp_client_set_id(dhcp_client);
 552
 553         if (dhcp->network) {
 554                 struct connman_service *service;
 555                 const char *hostname;
 556
 557                 service = connman_service_lookup_from_network(dhcp->network);
 558
 559                 hostname = __connman_service_get_hostname(service);
 560                 if (!hostname)
 561                         hostname = connman_utsname_get_hostname();
 562
 563                 if (hostname)
 564                         g_dhcp_client_set_send(dhcp_client,
 565                                                 G_DHCP_HOST_NAME, hostname);
 566
 567                 g_dhcp_client_set_request(dhcp_client, G_DHCP_HOST_NAME);
 568                 g_dhcp_client_set_request(dhcp_client, G_DHCP_DNS_SERVER);
 569                 g_dhcp_client_set_request(dhcp_client, G_DHCP_DOMAIN_NAME);
 570                 g_dhcp_client_set_request(dhcp_client, G_DHCP_NTP_SERVER);
 571                 g_dhcp_client_set_request(dhcp_client, 252);
 572         }
 573
 574         g_dhcp_client_set_request(dhcp_client, G_DHCP_SUBNET);
 575         g_dhcp_client_set_request(dhcp_client, G_DHCP_ROUTER);
 576
 577         g_dhcp_client_register_event(dhcp_client,
 578                         G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE,
 579                                                 lease_available_cb, dhcp);
 580
 581         g_dhcp_client_register_event(dhcp_client,
 582                         G_DHCP_CLIENT_EVENT_LEASE_LOST, lease_lost_cb, dhcp);
 583
 584         g_dhcp_client_register_event(dhcp_client,
 585                         G_DHCP_CLIENT_EVENT_NO_LEASE, no_lease_cb, dhcp);
 586
 587         dhcp->dhcp_client = dhcp_client;
 588
 589         return 0;
 590 }
 591
 592 static int dhcp_release(struct connman_dhcp *dhcp)
 593 {
 594         DBG("dhcp %p", dhcp);
 595
 596         if (dhcp->timeout > 0) {
 597                 g_source_remove(dhcp->timeout);
 598                 dhcp->timeout = 0;
 599         }
 600
 601         if (dhcp->dhcp_client) {
 602                 g_dhcp_client_stop(dhcp->dhcp_client);
 603                 g_dhcp_client_unref(dhcp->dhcp_client);
 604         }
 605
 606         dhcp->dhcp_client = NULL;
 607
 608         g_free(dhcp->dhcp_debug_prefix);
 609         dhcp->dhcp_debug_prefix = NULL;
 610
 611         ipv4ll_stop_client(dhcp);
 612
 613         return 0;
 614 }
 615
 616 char *__connman_dhcp_get_server_address(struct connman_ipconfig *ipconfig)
 617 {
 618         struct connman_dhcp *dhcp;
 619
 620         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 621         if (!dhcp)
 622                 return NULL;
 623
 624         return g_dhcp_client_get_server_address(dhcp->dhcp_client);
 625 }
 626
 627 int __connman_dhcp_start(struct connman_ipconfig *ipconfig,
 628                         struct connman_network *network, dhcp_cb callback,
 629                         gpointer user_data)
 630 {
 631         const char *last_addr = NULL;
 632         struct connman_dhcp *dhcp;
 633         int err;
 634
 635         DBG("");
 636
 637         if (network) {
 638                 struct connman_service *service;
 639
 640                 service = connman_service_lookup_from_network(network);
 641                 if (!service)
 642                         return -EINVAL;
 643         }
 644
 645         last_addr = __connman_ipconfig_get_dhcp_address(ipconfig);
 646
 647         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 648         if (!dhcp) {
 649
 650                 dhcp = g_try_new0(struct connman_dhcp, 1);
 651                 if (!dhcp)
 652                         return -ENOMEM;
 653
 654                 dhcp->ipconfig = ipconfig;
 655                 __connman_ipconfig_ref(ipconfig);
 656
 657                 if (network) {
 658                         dhcp->network = network;
 659                         connman_network_ref(network);
 660                 }
 661
 662                 err = dhcp_initialize(dhcp);
 663
 664                 if (err < 0) {
 665                         if (network)
 666                                 connman_network_unref(network);
 667                         g_free(dhcp);
 668                         return err;
 669                 }
 670
 671                 g_hash_table_insert(ipconfig_table, ipconfig, dhcp);
 672         }
 673
 674         dhcp->callback = callback;
 675         dhcp->user_data = user_data;
 676
 677         return g_dhcp_client_start(dhcp->dhcp_client, last_addr);
 678 }
 679
 680 void __connman_dhcp_stop(struct connman_ipconfig *ipconfig)
 681 {
 682         struct connman_dhcp *dhcp;
 683
 684         DBG("ipconfig_table %p ipconfig %p", ipconfig_table, ipconfig);
 685
 686         if (!ipconfig_table)
 687                 return;
 688
 689         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 690         if (dhcp) {
 691                 g_hash_table_remove(ipconfig_table, ipconfig);
 692                 __connman_ipconfig_unref(ipconfig);
 693                 if (dhcp->network)
 694                         connman_network_unref(dhcp->network);
 695                 dhcp_release(dhcp);
 696                 dhcp_invalidate(dhcp, false);
 697                 dhcp_free(dhcp);
 698         }
 699 }
 700
 701 int __connman_dhcp_init(void)
 702 {
 703         DBG("");
 704
 705         ipconfig_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
 706                                                                 NULL, NULL);
 707
 708         return 0;
 709 }
 710
 711 void __connman_dhcp_cleanup(void)
 712 {
 713         DBG("");
 714
 715         g_hash_table_destroy(ipconfig_table);
 716         ipconfig_table = NULL;
 717
 718         dhcp_cleanup_random();
 719 }