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 #if defined TIZEN_EXT
  65         DBG("dhcp_free [%p]", dhcp);
  66 #endif
  67         g_strfreev(dhcp->nameservers);
  68         g_strfreev(dhcp->timeservers);
  69         g_free(dhcp->pac);
  70
  71         dhcp->nameservers = NULL;
  72         dhcp->timeservers = NULL;
  73         dhcp->pac = NULL;
  74
  75         g_free(dhcp);
  76 #if defined TIZEN_EXT
  77         dhcp = NULL;
  78 #endif
  79 }
  80
  81 static void ipv4ll_stop_client(struct connman_dhcp *dhcp)
  82 {
  83 #if defined TIZEN_EXT
  84         DBG("dhcp [%p] ipv4ll_client [%p]", dhcp, dhcp->ipv4ll_client);
  85 #endif
  86         if (!dhcp->ipv4ll_client)
  87                 return;
  88
  89         g_dhcp_client_stop(dhcp->ipv4ll_client);
  90         g_dhcp_client_unref(dhcp->ipv4ll_client);
  91         dhcp->ipv4ll_client = NULL;
  92         ipv4ll_running = false;
  93
  94         g_free(dhcp->ipv4ll_debug_prefix);
  95         dhcp->ipv4ll_debug_prefix = NULL;
  96 }
  97
  98 static bool apply_dhcp_invalidate_on_network(struct connman_dhcp *dhcp)
  99 {
 100         struct connman_service *service;
 101         int i;
 102
 103         if (!dhcp->network)
 104                 return true;
 105
 106         service = connman_service_lookup_from_network(dhcp->network);
 107         if (!service) {
 108                 connman_error("Can not lookup service");
 109                 return false;
 110         }
 111
 112         __connman_service_set_domainname(service, NULL);
 113         __connman_ipconfig_set_proxy_autoconfig(dhcp->ipconfig, NULL);
 114
 115         if (dhcp->timeservers) {
 116                 for (i = 0; dhcp->timeservers[i]; i++) {
 117                         __connman_service_timeserver_remove(service,
 118                                                         dhcp->timeservers[i]);
 119                 }
 120         }
 121         if (dhcp->nameservers) {
 122                 for (i = 0; dhcp->nameservers[i]; i++) {
 123 #if defined TIZEN_EXT
 124                         __connman_service_nameserver_remove(service,
 125                                                 dhcp->nameservers[i], false,
 126                                                 CONNMAN_IPCONFIG_TYPE_IPV4);
 127 #else
 128                         __connman_service_nameserver_remove(service,
 129                                                 dhcp->nameservers[i], false);
 130 #endif
 131                 }
 132         }
 133
 134         return true;
 135 }
 136
 137 /**
 138  * dhcp_invalidate: Invalidate an existing DHCP lease
 139  * @dhcp: pointer to the DHCP lease to invalidate.
 140  * @callback: flag indicating whether or not to invoke the client callback
 141  *            if present.
 142  *
 143  * Invalidates an existing DHCP lease, optionally invoking the client
 144  * callback. The caller may wish to avoid the client callback invocation
 145  * when the invocation of that callback might otherwise unnecessarily upset
 146  * service state due to the IP configuration change implied by this
 147  * invalidation.
 148  */
 149 static void dhcp_invalidate(struct connman_dhcp *dhcp, bool callback)
 150 {
 151         DBG("dhcp %p callback %u", dhcp, callback);
 152
 153         if (!dhcp)
 154                 return;
 155
 156         __connman_6to4_remove(dhcp->ipconfig);
 157
 158         if (!apply_dhcp_invalidate_on_network(dhcp))
 159                 return;
 160
 161         __connman_ipconfig_set_dhcp_address(dhcp->ipconfig,
 162                                 __connman_ipconfig_get_local(dhcp->ipconfig));
 163         DBG("last address %s",
 164                         __connman_ipconfig_get_dhcp_address(dhcp->ipconfig));
 165
 166         __connman_ipconfig_address_remove(dhcp->ipconfig);
 167
 168         __connman_ipconfig_set_local(dhcp->ipconfig, NULL);
 169         __connman_ipconfig_set_broadcast(dhcp->ipconfig, NULL);
 170         __connman_ipconfig_set_gateway(dhcp->ipconfig, NULL);
 171         __connman_ipconfig_set_prefixlen(dhcp->ipconfig, 0);
 172
 173         if (dhcp->callback && callback)
 174                 dhcp->callback(dhcp->ipconfig, dhcp->network,
 175                                                 false, dhcp->user_data);
 176 }
 177
 178 static void dhcp_valid(struct connman_dhcp *dhcp)
 179 {
 180         if (dhcp->callback)
 181                 dhcp->callback(dhcp->ipconfig, dhcp->network,
 182                                                 true, dhcp->user_data);
 183 }
 184
 185 static void dhcp_debug(const char *str, void *data)
 186 {
 187         connman_info("%s: %s", (const char *) data, str);
 188 }
 189
 190 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data);
 191 static void ipv4ll_available_cb(GDHCPClient *ipv4ll_client, gpointer user_data);
 192
 193 static int ipv4ll_start_client(struct connman_dhcp *dhcp)
 194 {
 195         GDHCPClient *ipv4ll_client;
 196         GDHCPClientError error;
 197         const char *hostname;
 198         int index;
 199         int err;
 200
 201 #if defined TIZEN_EXT
 202         DBG("dhcp %p", dhcp);
 203 #endif
 204
 205         if (dhcp->ipv4ll_client)
 206                 return -EALREADY;
 207
 208         index = __connman_ipconfig_get_index(dhcp->ipconfig);
 209
 210         ipv4ll_client = g_dhcp_client_new(G_DHCP_IPV4LL, index, &error);
 211         if (error != G_DHCP_CLIENT_ERROR_NONE)
 212                 return -EINVAL;
 213
 214 #if !defined TIZEN_EXT
 215         if (getenv("CONNMAN_DHCP_DEBUG")) {
 216 #endif
 217                 dhcp->ipv4ll_debug_prefix = g_strdup_printf("IPv4LL index %d",
 218                                                         index);
 219                 g_dhcp_client_set_debug(ipv4ll_client, dhcp_debug,
 220                                         dhcp->ipv4ll_debug_prefix);
 221 #if !defined TIZEN_EXT
 222         }
 223 #endif
 224
 225         g_dhcp_client_set_id(ipv4ll_client);
 226
 227         if (dhcp->network) {
 228                 hostname = connman_utsname_get_hostname();
 229                 if (hostname)
 230                         g_dhcp_client_set_send(ipv4ll_client,
 231                                                 G_DHCP_HOST_NAME, hostname);
 232         }
 233
 234         g_dhcp_client_register_event(ipv4ll_client,
 235                         G_DHCP_CLIENT_EVENT_IPV4LL_LOST, ipv4ll_lost_cb, dhcp);
 236
 237         g_dhcp_client_register_event(ipv4ll_client,
 238                         G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE,
 239                                                 ipv4ll_available_cb, dhcp);
 240
 241         dhcp->ipv4ll_client = ipv4ll_client;
 242
 243         err = g_dhcp_client_start(dhcp->ipv4ll_client, NULL);
 244         if (err < 0) {
 245                 ipv4ll_stop_client(dhcp);
 246                 return err;
 247         }
 248
 249         ipv4ll_running = true;
 250         return 0;
 251 }
 252
 253 static gboolean dhcp_retry_cb(gpointer user_data)
 254 {
 255         struct connman_dhcp *dhcp = user_data;
 256
 257         dhcp->timeout = 0;
 258 #if defined TIZEN_EXT
 259         DBG("dhcp %p", dhcp);
 260         DBG("dhcp->timeout %d", dhcp->timeout);
 261 #endif
 262         g_dhcp_client_start(dhcp->dhcp_client,
 263                         __connman_ipconfig_get_dhcp_address(dhcp->ipconfig));
 264
 265         return FALSE;
 266 }
 267
 268 static void no_lease_cb(GDHCPClient *dhcp_client, gpointer user_data)
 269 {
 270         struct connman_dhcp *dhcp = user_data;
 271         int err;
 272
 273         DBG("No lease available ipv4ll %d client %p", ipv4ll_running,
 274                 dhcp->ipv4ll_client);
 275
 276         if (dhcp->timeout > 0)
 277                 g_source_remove(dhcp->timeout);
 278
 279         dhcp->timeout = g_timeout_add_seconds(RATE_LIMIT_INTERVAL,
 280                         dhcp_retry_cb,
 281                         dhcp);
 282         if (ipv4ll_running)
 283                 return;
 284
 285         err = ipv4ll_start_client(dhcp);
 286         if (err < 0)
 287                 DBG("Cannot start ipv4ll client (%d/%s)", err, strerror(-err));
 288
 289         /* Only notify upper layer if we have a problem */
 290         dhcp_invalidate(dhcp, !ipv4ll_running);
 291 }
 292
 293 static void lease_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 294 {
 295         struct connman_dhcp *dhcp = user_data;
 296
 297         DBG("Lease lost");
 298
 299         /* Upper layer will decide what to do, e.g. nothing or retry. */
 300         dhcp_invalidate(dhcp, true);
 301 }
 302
 303 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 304 {
 305         struct connman_dhcp *dhcp = user_data;
 306
 307         DBG("Lease lost");
 308
 309         ipv4ll_stop_client(dhcp);
 310
 311         /*
 312          * Since we lost our IPv4LL configuration we might as notify
 313          * the upper layers.
 314          */
 315         dhcp_invalidate(dhcp, true);
 316 }
 317
 318 static bool compare_string_arrays(char **array_a, char **array_b)
 319 {
 320         int i;
 321
 322         if (!array_a || !array_b)
 323                 return false;
 324
 325         if (g_strv_length(array_a) != g_strv_length(array_b))
 326                 return false;
 327
 328         for (i = 0; array_a[i] &&
 329                              array_b[i]; i++) {
 330                 if (g_strcmp0(array_a[i], array_b[i]) != 0)
 331                         return false;
 332         }
 333
 334         return true;
 335 }
 336
 337 static bool apply_lease_available_on_network(GDHCPClient *dhcp_client,
 338                                                 struct connman_dhcp *dhcp)
 339 {
 340         char **nameservers, **timeservers, *pac = NULL;
 341         struct connman_service *service;
 342         GList *list, *option = NULL;
 343         int ns_entries;
 344         int i;
 345
 346         if (!dhcp->network)
 347                 return true;
 348
 349         service = connman_service_lookup_from_network(dhcp->network);
 350         if (!service) {
 351                 connman_error("Can not lookup service");
 352                 return false;
 353         }
 354
 355         option = g_dhcp_client_get_option(dhcp_client, 252);
 356         if (option)
 357                 pac = g_strdup(option->data);
 358
 359         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DNS_SERVER);
 360         ns_entries = g_list_length(option);
 361         nameservers = g_try_new0(char *, ns_entries + 1);
 362         if (nameservers) {
 363                 for (i = 0, list = option;list; list = list->next, i++)
 364                         nameservers[i] = g_strdup(list->data);
 365                 nameservers[ns_entries] = NULL;
 366         }
 367
 368         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DOMAIN_NAME);
 369         if (option)
 370                 __connman_service_set_domainname(service, option->data);
 371
 372         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_HOST_NAME);
 373         if (option)
 374                 __connman_service_set_hostname(service, option->data);
 375
 376         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_NTP_SERVER);
 377         ns_entries = g_list_length(option);
 378         timeservers = g_try_new0(char *, ns_entries + 1);
 379         if (timeservers) {
 380                 for (i = 0, list = option; list; list = list->next, i++)
 381                         timeservers[i] = g_strdup(list->data);
 382                 timeservers[ns_entries] = NULL;
 383         }
 384
 385         if (!compare_string_arrays(nameservers, dhcp->nameservers)) {
 386                 if (dhcp->nameservers) {
 387 #if defined TIZEN_EXT
 388                         for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 389                                 __connman_service_nameserver_remove(service,
 390                                                 dhcp->nameservers[i], false,
 391                                                 CONNMAN_IPCONFIG_TYPE_IPV4);
 392                         }
 393 #else
 394                         for (i = 0; dhcp->nameservers[i]; i++) {
 395                                 __connman_service_nameserver_remove(service,
 396                                                 dhcp->nameservers[i], false);
 397                         }
 398 #endif
 399                         g_strfreev(dhcp->nameservers);
 400                 }
 401
 402                 dhcp->nameservers = nameservers;
 403
 404                 for (i = 0; dhcp->nameservers && dhcp->nameservers[i]; i++) {
 405 #if defined TIZEN_EXT
 406                         __connman_service_nameserver_append(service,
 407                                                 dhcp->nameservers[i], false,
 408                                                 CONNMAN_IPCONFIG_TYPE_IPV4);
 409 #else
 410                         __connman_service_nameserver_append(service,
 411                                                 dhcp->nameservers[i], false);
 412 #endif
 413                 }
 414         } else {
 415                 g_strfreev(nameservers);
 416         }
 417
 418         if (!compare_string_arrays(timeservers, dhcp->timeservers)) {
 419                 if (dhcp->timeservers) {
 420                         for (i = 0; dhcp->timeservers[i]; i++) {
 421                                 __connman_service_timeserver_remove(service,
 422                                                         dhcp->timeservers[i]);
 423                         }
 424                         g_strfreev(dhcp->timeservers);
 425                 }
 426
 427                 dhcp->timeservers = timeservers;
 428
 429                 for (i = 0; dhcp->timeservers && dhcp->timeservers[i]; i++) {
 430                         __connman_service_timeserver_append(service,
 431                                                         dhcp->timeservers[i]);
 432                 }
 433         } else {
 434                 g_strfreev(timeservers);
 435         }
 436
 437         if (g_strcmp0(pac, dhcp->pac) != 0) {
 438                 g_free(dhcp->pac);
 439                 dhcp->pac = pac;
 440
 441                 __connman_ipconfig_set_proxy_autoconfig(dhcp->ipconfig,
 442                                                                 dhcp->pac);
 443         }
 444
 445         if (connman_setting_get_bool("Enable6to4"))
 446                 __connman_6to4_probe(service);
 447
 448         return true;
 449 }
 450
 451 static void lease_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 452 {
 453         struct connman_dhcp *dhcp = user_data;
 454         GList *option = NULL;
 455         char *address, *netmask = NULL, *gateway = NULL;
 456         const char *c_address, *c_gateway;
 457         unsigned char prefixlen, c_prefixlen;
 458         bool ip_change = false;
 459
 460         DBG("Lease available");
 461
 462         if (dhcp->ipv4ll_client) {
 463                 ipv4ll_stop_client(dhcp);
 464                 dhcp_invalidate(dhcp, false);
 465         }
 466
 467         c_address = __connman_ipconfig_get_local(dhcp->ipconfig);
 468         c_gateway = __connman_ipconfig_get_gateway(dhcp->ipconfig);
 469         c_prefixlen = __connman_ipconfig_get_prefixlen(dhcp->ipconfig);
 470
 471         address = g_dhcp_client_get_address(dhcp_client);
 472
 473         __connman_ipconfig_set_dhcp_address(dhcp->ipconfig, address);
 474         DBG("last address %s", address);
 475
 476         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_SUBNET);
 477         if (option)
 478                 netmask = g_strdup(option->data);
 479
 480         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_ROUTER);
 481         if (option)
 482                 gateway = g_strdup(option->data);
 483
 484         prefixlen = connman_ipaddress_calc_netmask_len(netmask);
 485         if (prefixlen == 255)
 486                 connman_warn("netmask: %s is invalid", netmask);
 487
 488         DBG("c_address %s", c_address);
 489
 490         if (g_strcmp0(address, c_address)) {
 491                 ip_change = true;
 492                 if (c_address) {
 493                         /* Remove old ip address */
 494                         __connman_ipconfig_address_remove(dhcp->ipconfig);
 495                 }
 496         }
 497         if (g_strcmp0(gateway, c_gateway)) {
 498                 ip_change = true;
 499                 if (c_gateway) {
 500                         /* Remove gateway ip address */
 501                         __connman_ipconfig_gateway_remove(dhcp->ipconfig);
 502                 }
 503         } else if (prefixlen != c_prefixlen)
 504                 ip_change = true;
 505
 506         __connman_ipconfig_set_method(dhcp->ipconfig,
 507                                                 CONNMAN_IPCONFIG_METHOD_DHCP);
 508         if (ip_change) {
 509                 __connman_ipconfig_set_local(dhcp->ipconfig, address);
 510                 __connman_ipconfig_set_prefixlen(dhcp->ipconfig, prefixlen);
 511                 __connman_ipconfig_set_gateway(dhcp->ipconfig, gateway);
 512         }
 513
 514         if (!apply_lease_available_on_network(dhcp_client, dhcp))
 515                 goto done;
 516
 517         if (ip_change)
 518                 dhcp_valid(dhcp);
 519
 520 done:
 521         g_free(address);
 522         g_free(netmask);
 523         g_free(gateway);
 524 }
 525
 526 static void ipv4ll_available_cb(GDHCPClient *ipv4ll_client, gpointer user_data)
 527 {
 528         struct connman_dhcp *dhcp = user_data;
 529                 char *address, *netmask;
 530                 unsigned char prefixlen;
 531
 532         DBG("IPV4LL available");
 533
 534         address = g_dhcp_client_get_address(ipv4ll_client);
 535         netmask = g_dhcp_client_get_netmask(ipv4ll_client);
 536
 537         prefixlen = connman_ipaddress_calc_netmask_len(netmask);
 538
 539         __connman_ipconfig_set_method(dhcp->ipconfig,
 540                                                 CONNMAN_IPCONFIG_METHOD_DHCP);
 541         __connman_ipconfig_set_local(dhcp->ipconfig, address);
 542         __connman_ipconfig_set_prefixlen(dhcp->ipconfig, prefixlen);
 543         __connman_ipconfig_set_gateway(dhcp->ipconfig, NULL);
 544
 545         dhcp_valid(dhcp);
 546
 547         g_free(address);
 548         g_free(netmask);
 549 }
 550
 551 static int dhcp_initialize(struct connman_dhcp *dhcp)
 552 {
 553         GDHCPClient *dhcp_client;
 554         GDHCPClientError error;
 555         int index;
 556
 557         DBG("dhcp %p", dhcp);
 558
 559         index = __connman_ipconfig_get_index(dhcp->ipconfig);
 560
 561         dhcp_client = g_dhcp_client_new(G_DHCP_IPV4, index, &error);
 562         if (error != G_DHCP_CLIENT_ERROR_NONE)
 563 #if defined TIZEN_EXT
 564         {
 565                 DBG("failed g_dhcp_client_new(%d), index(%d)", error, index);
 566 #endif
 567                 return -EINVAL;
 568 #if defined TIZEN_EXT
 569         }
 570 #endif
 571
 572 #if !defined TIZEN_EXT
 573         if (getenv("CONNMAN_DHCP_DEBUG")) {
 574 #endif
 575                 dhcp->dhcp_debug_prefix = g_strdup_printf("DHCP index %d",
 576                                                         index);
 577                 g_dhcp_client_set_debug(dhcp_client, dhcp_debug,
 578                                         dhcp->dhcp_debug_prefix);
 579 #if !defined TIZEN_EXT
 580         }
 581 #endif
 582
 583         g_dhcp_client_set_id(dhcp_client);
 584
 585         if (dhcp->network) {
 586                 struct connman_service *service;
 587                 const char *hostname;
 588
 589                 service = connman_service_lookup_from_network(dhcp->network);
 590
 591                 hostname = __connman_service_get_hostname(service);
 592                 if (!hostname)
 593                         hostname = connman_utsname_get_hostname();
 594
 595                 if (hostname)
 596                         g_dhcp_client_set_send(dhcp_client,
 597                                                 G_DHCP_HOST_NAME, hostname);
 598
 599                 g_dhcp_client_set_request(dhcp_client, G_DHCP_HOST_NAME);
 600                 g_dhcp_client_set_request(dhcp_client, G_DHCP_DNS_SERVER);
 601                 g_dhcp_client_set_request(dhcp_client, G_DHCP_DOMAIN_NAME);
 602                 g_dhcp_client_set_request(dhcp_client, G_DHCP_NTP_SERVER);
 603                 g_dhcp_client_set_request(dhcp_client, 252);
 604         }
 605
 606         g_dhcp_client_set_request(dhcp_client, G_DHCP_SUBNET);
 607         g_dhcp_client_set_request(dhcp_client, G_DHCP_ROUTER);
 608
 609         g_dhcp_client_register_event(dhcp_client,
 610                         G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE,
 611                                                 lease_available_cb, dhcp);
 612
 613         g_dhcp_client_register_event(dhcp_client,
 614                         G_DHCP_CLIENT_EVENT_LEASE_LOST, lease_lost_cb, dhcp);
 615
 616         g_dhcp_client_register_event(dhcp_client,
 617                         G_DHCP_CLIENT_EVENT_NO_LEASE, no_lease_cb, dhcp);
 618
 619         dhcp->dhcp_client = dhcp_client;
 620
 621         return 0;
 622 }
 623
 624 static int dhcp_release(struct connman_dhcp *dhcp)
 625 {
 626         DBG("dhcp %p", dhcp);
 627
 628         if (dhcp->timeout > 0) {
 629                 g_source_remove(dhcp->timeout);
 630                 dhcp->timeout = 0;
 631         }
 632
 633         if (dhcp->dhcp_client) {
 634                 g_dhcp_client_stop(dhcp->dhcp_client);
 635                 g_dhcp_client_unref(dhcp->dhcp_client);
 636         }
 637
 638         dhcp->dhcp_client = NULL;
 639
 640         g_free(dhcp->dhcp_debug_prefix);
 641         dhcp->dhcp_debug_prefix = NULL;
 642
 643         ipv4ll_stop_client(dhcp);
 644
 645         return 0;
 646 }
 647
 648 char *__connman_dhcp_get_server_address(struct connman_ipconfig *ipconfig)
 649 {
 650         struct connman_dhcp *dhcp;
 651
 652         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 653         if (!dhcp)
 654                 return NULL;
 655
 656         return g_dhcp_client_get_server_address(dhcp->dhcp_client);
 657 }
 658
 659 int __connman_dhcp_start(struct connman_ipconfig *ipconfig,
 660                         struct connman_network *network, dhcp_cb callback,
 661                         gpointer user_data)
 662 {
 663 #if !defined TIZEN_EXT
 664         const char *last_addr = NULL;
 665 #endif
 666         struct connman_dhcp *dhcp;
 667         int err;
 668
 669         DBG("");
 670
 671         if (network) {
 672                 struct connman_service *service;
 673
 674                 service = connman_service_lookup_from_network(network);
 675                 if (!service)
 676                         return -EINVAL;
 677         }
 678
 679 #if !defined TIZEN_EXT
 680         last_addr = __connman_ipconfig_get_dhcp_address(ipconfig);
 681 #endif
 682
 683         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 684         if (!dhcp) {
 685
 686                 dhcp = g_try_new0(struct connman_dhcp, 1);
 687                 if (!dhcp)
 688                         return -ENOMEM;
 689
 690                 dhcp->ipconfig = ipconfig;
 691                 __connman_ipconfig_ref(ipconfig);
 692
 693                 if (network) {
 694                         dhcp->network = network;
 695                         connman_network_ref(network);
 696                 }
 697
 698                 err = dhcp_initialize(dhcp);
 699
 700                 if (err < 0) {
 701                         if (network)
 702                                 connman_network_unref(network);
 703                         g_free(dhcp);
 704                         return err;
 705                 }
 706
 707                 g_hash_table_insert(ipconfig_table, ipconfig, dhcp);
 708         }
 709
 710         dhcp->callback = callback;
 711         dhcp->user_data = user_data;
 712
 713 #if defined TIZEN_EXT
 714         DBG("Start DHCP with DHCPDISCOVER request");
 715
 716         return g_dhcp_client_start(dhcp->dhcp_client, NULL);
 717 #else
 718         return g_dhcp_client_start(dhcp->dhcp_client, last_addr);
 719 #endif
 720 }
 721
 722 void __connman_dhcp_stop(struct connman_ipconfig *ipconfig)
 723 {
 724         struct connman_dhcp *dhcp;
 725
 726         DBG("ipconfig_table %p ipconfig %p", ipconfig_table, ipconfig);
 727
 728         if (!ipconfig_table)
 729                 return;
 730
 731         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 732         if (dhcp) {
 733                 g_hash_table_remove(ipconfig_table, ipconfig);
 734                 __connman_ipconfig_unref(ipconfig);
 735                 if (dhcp->network)
 736                         connman_network_unref(dhcp->network);
 737                 dhcp_release(dhcp);
 738                 dhcp_invalidate(dhcp, false);
 739                 dhcp_free(dhcp);
 740         }
 741 }
 742
 743 int __connman_dhcp_init(void)
 744 {
 745         DBG("");
 746
 747         ipconfig_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
 748                                                                 NULL, NULL);
 749
 750         return 0;
 751 }
 752
 753 void __connman_dhcp_cleanup(void)
 754 {
 755         DBG("");
 756
 757         g_hash_table_destroy(ipconfig_table);
 758         ipconfig_table = NULL;
 759
 760         dhcp_cleanup_random();
 761 }