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 #include <net/ethernet.h>
  30
  31 #ifndef IPV6_MIN_MTU
  32 #define IPV6_MIN_MTU 1280
  33 #endif
  34
  35 #include <connman/ipconfig.h>
  36 #include <include/setting.h>
  37
  38 #include <gdhcp/gdhcp.h>
  39
  40 #include <glib.h>
  41
  42 #include "connman.h"
  43
  44 #define RATE_LIMIT_INTERVAL     60      /* delay between successive attempts */
  45
  46 struct connman_dhcp {
  47         struct connman_ipconfig *ipconfig;
  48         struct connman_network *network;
  49         dhcp_cb callback;
  50         gpointer user_data;
  51
  52         char **nameservers;
  53         char **timeservers;
  54         char *pac;
  55
  56         unsigned int timeout;
  57
  58         GDHCPClient *ipv4ll_client;
  59         GDHCPClient *dhcp_client;
  60         char *ipv4ll_debug_prefix;
  61         char *dhcp_debug_prefix;
  62
  63         bool ipv4ll_running;
  64 };
  65
  66 static GHashTable *ipconfig_table;
  67
  68 static void dhcp_free(struct connman_dhcp *dhcp)
  69 {
  70         g_strfreev(dhcp->nameservers);
  71         g_strfreev(dhcp->timeservers);
  72         g_free(dhcp->pac);
  73
  74         dhcp->nameservers = NULL;
  75         dhcp->timeservers = NULL;
  76         dhcp->pac = NULL;
  77
  78         g_free(dhcp);
  79 }
  80
  81 static void ipv4ll_stop_client(struct connman_dhcp *dhcp)
  82 {
  83         if (!dhcp->ipv4ll_client)
  84                 return;
  85
  86         g_dhcp_client_stop(dhcp->ipv4ll_client);
  87         g_dhcp_client_unref(dhcp->ipv4ll_client);
  88         dhcp->ipv4ll_client = NULL;
  89         dhcp->ipv4ll_running = false;
  90
  91         g_free(dhcp->ipv4ll_debug_prefix);
  92         dhcp->ipv4ll_debug_prefix = NULL;
  93 }
  94
  95 static bool apply_dhcp_invalidate_on_network(struct connman_dhcp *dhcp)
  96 {
  97         struct connman_service *service;
  98         int i;
  99
 100         if (!dhcp->network)
 101                 return true;
 102
 103         service = connman_service_lookup_from_network(dhcp->network);
 104         if (!service) {
 105                 connman_error("Can not lookup service");
 106                 return false;
 107         }
 108
 109         __connman_service_set_domainname(service, NULL);
 110         __connman_ipconfig_set_proxy_autoconfig(dhcp->ipconfig, NULL);
 111
 112         if (dhcp->timeservers) {
 113                 for (i = 0; dhcp->timeservers[i]; i++) {
 114                         __connman_service_timeserver_remove(service,
 115                                                         dhcp->timeservers[i]);
 116                 }
 117                 g_strfreev(dhcp->timeservers);
 118                 dhcp->timeservers = NULL;
 119         }
 120         if (dhcp->nameservers) {
 121                 for (i = 0; dhcp->nameservers[i]; i++) {
 122                         __connman_service_nameserver_remove(service,
 123                                                 dhcp->nameservers[i], false);
 124                 }
 125                 g_strfreev(dhcp->nameservers);
 126                 dhcp->nameservers = NULL;
 127         }
 128
 129         return true;
 130 }
 131
 132 /**
 133  * dhcp_invalidate: Invalidate an existing DHCP lease
 134  * @dhcp: pointer to the DHCP lease to invalidate.
 135  * @callback: flag indicating whether or not to invoke the client callback
 136  *            if present.
 137  *
 138  * Invalidates an existing DHCP lease, optionally invoking the client
 139  * callback. The caller may wish to avoid the client callback invocation
 140  * when the invocation of that callback might otherwise unnecessarily upset
 141  * service state due to the IP configuration change implied by this
 142  * invalidation.
 143  */
 144 static void dhcp_invalidate(struct connman_dhcp *dhcp, bool callback)
 145 {
 146         DBG("dhcp %p callback %u", dhcp, callback);
 147
 148         if (!dhcp)
 149                 return;
 150
 151         __connman_6to4_remove(dhcp->ipconfig);
 152
 153         if (!apply_dhcp_invalidate_on_network(dhcp))
 154                 return;
 155
 156         __connman_ipconfig_set_dhcp_address(dhcp->ipconfig,
 157                                 __connman_ipconfig_get_local(dhcp->ipconfig));
 158         DBG("last address %s",
 159                         __connman_ipconfig_get_dhcp_address(dhcp->ipconfig));
 160
 161         __connman_ipconfig_address_remove(dhcp->ipconfig);
 162
 163         __connman_ipconfig_set_local(dhcp->ipconfig, NULL);
 164         __connman_ipconfig_set_broadcast(dhcp->ipconfig, NULL);
 165         __connman_ipconfig_set_gateway(dhcp->ipconfig, NULL);
 166         __connman_ipconfig_set_prefixlen(dhcp->ipconfig, 0);
 167
 168         if (dhcp->callback && callback)
 169                 dhcp->callback(dhcp->ipconfig, dhcp->network,
 170                                                 false, dhcp->user_data);
 171 }
 172
 173 static void dhcp_valid(struct connman_dhcp *dhcp)
 174 {
 175         if (dhcp->callback)
 176                 dhcp->callback(dhcp->ipconfig, dhcp->network,
 177                                                 true, dhcp->user_data);
 178 }
 179
 180 static void dhcp_debug(const char *str, void *data)
 181 {
 182         connman_info("%s: %s", (const char *) data, str);
 183 }
 184
 185 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data);
 186 static void ipv4ll_available_cb(GDHCPClient *ipv4ll_client, gpointer user_data);
 187
 188 static int ipv4ll_start_client(struct connman_dhcp *dhcp)
 189 {
 190         GDHCPClient *ipv4ll_client;
 191         GDHCPClientError error;
 192         const char *hostname;
 193         int index;
 194         int err;
 195
 196         if (dhcp->ipv4ll_client)
 197                 return -EALREADY;
 198
 199         index = __connman_ipconfig_get_index(dhcp->ipconfig);
 200
 201         ipv4ll_client = g_dhcp_client_new(G_DHCP_IPV4LL, index, &error);
 202         if (error != G_DHCP_CLIENT_ERROR_NONE)
 203                 return -EINVAL;
 204
 205         if (getenv("CONNMAN_DHCP_DEBUG")) {
 206                 dhcp->ipv4ll_debug_prefix = g_strdup_printf("IPv4LL index %d",
 207                                                         index);
 208                 g_dhcp_client_set_debug(ipv4ll_client, dhcp_debug,
 209                                         dhcp->ipv4ll_debug_prefix);
 210         }
 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         dhcp->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", dhcp->ipv4ll_running,
 258                 dhcp->ipv4ll_client);
 259
 260         if (dhcp->timeout > 0)
 261                 g_source_remove(dhcp->timeout);
 262
 263         dhcp->timeout = g_timeout_add_seconds(RATE_LIMIT_INTERVAL,
 264                                                 dhcp_retry_cb,
 265                                                 dhcp);
 266         if (dhcp->ipv4ll_running)
 267                 return;
 268
 269         err = ipv4ll_start_client(dhcp);
 270         if (err < 0)
 271                 DBG("Cannot start ipv4ll client (%d/%s)", err, strerror(-err));
 272
 273         /* Only notify upper layer if we have a problem */
 274         dhcp_invalidate(dhcp, !dhcp->ipv4ll_running);
 275 }
 276
 277 static void lease_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 278 {
 279         struct connman_dhcp *dhcp = user_data;
 280
 281         DBG("Lease lost");
 282
 283         /* Upper layer will decide what to do, e.g. nothing or retry. */
 284         dhcp_invalidate(dhcp, true);
 285 }
 286
 287 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 288 {
 289         struct connman_dhcp *dhcp = user_data;
 290
 291         DBG("Lease lost");
 292
 293         ipv4ll_stop_client(dhcp);
 294
 295         /*
 296          * Since we lost our IPv4LL configuration we might as notify
 297          * the upper layers.
 298          */
 299         dhcp_invalidate(dhcp, true);
 300 }
 301
 302 static bool compare_string_arrays(char **array_a, char **array_b)
 303 {
 304         int i;
 305
 306         if (!array_a || !array_b)
 307                 return false;
 308
 309         if (g_strv_length(array_a) != g_strv_length(array_b))
 310                 return false;
 311
 312         for (i = 0; array_a[i] &&
 313                              array_b[i]; i++) {
 314                 if (g_strcmp0(array_a[i], array_b[i]) != 0)
 315                         return false;
 316         }
 317
 318         return true;
 319 }
 320
 321 static bool apply_lease_available_on_network(GDHCPClient *dhcp_client,
 322                                                 struct connman_dhcp *dhcp)
 323 {
 324         char **nameservers, **timeservers, *pac = NULL;
 325         struct connman_service *service;
 326         GList *list, *option = NULL;
 327         int ns_entries;
 328         int i;
 329
 330         if (!dhcp->network)
 331                 return true;
 332
 333         service = connman_service_lookup_from_network(dhcp->network);
 334         if (!service) {
 335                 connman_error("Can not lookup service");
 336                 return false;
 337         }
 338
 339         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_MTU);
 340         if (option && option->data) {
 341                 int mtu, index, err;
 342
 343                 mtu = atoi(option->data);
 344
 345                 if (mtu >= IPV6_MIN_MTU && mtu <= ETH_DATA_LEN) {
 346                         index = __connman_ipconfig_get_index(dhcp->ipconfig);
 347                         err = connman_inet_set_mtu(index, mtu);
 348
 349                         DBG("MTU %d index %d err %d", mtu, index, err);
 350                 }
 351         }
 352
 353         option = g_dhcp_client_get_option(dhcp_client, 252);
 354         if (option)
 355                 pac = g_strdup(option->data);
 356
 357         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DNS_SERVER);
 358         ns_entries = g_list_length(option);
 359         nameservers = g_try_new0(char *, ns_entries + 1);
 360         if (nameservers) {
 361                 for (i = 0, list = option;list; list = list->next, i++)
 362                         nameservers[i] = g_strdup(list->data);
 363                 nameservers[ns_entries] = NULL;
 364         }
 365
 366         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DOMAIN_NAME);
 367         if (option)
 368                 __connman_service_set_domainname(service, option->data);
 369
 370         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_HOST_NAME);
 371         if (option)
 372                 __connman_service_set_hostname(service, option->data);
 373
 374         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_NTP_SERVER);
 375         ns_entries = g_list_length(option);
 376         timeservers = g_try_new0(char *, ns_entries + 1);
 377         if (timeservers) {
 378                 for (i = 0, list = option; list; list = list->next, i++)
 379                         timeservers[i] = g_strdup(list->data);
 380                 timeservers[ns_entries] = NULL;
 381         }
 382
 383         if (!compare_string_arrays(nameservers, dhcp->nameservers)) {
 384                 if (dhcp->nameservers) {
 385                         for (i = 0; dhcp->nameservers[i]; i++) {
 386                                 __connman_service_nameserver_remove(service,
 387                                                 dhcp->nameservers[i], false);
 388                         }
 389                         g_strfreev(dhcp->nameservers);
 390                 }
 391
 392                 dhcp->nameservers = nameservers;
 393
 394                 for (i = 0; dhcp->nameservers && dhcp->nameservers[i]; i++) {
 395                         __connman_service_nameserver_append(service,
 396                                                 dhcp->nameservers[i], false);
 397                 }
 398         } else {
 399                 g_strfreev(nameservers);
 400         }
 401
 402         if (!compare_string_arrays(timeservers, dhcp->timeservers)) {
 403                 if (dhcp->timeservers) {
 404                         for (i = 0; dhcp->timeservers[i]; i++) {
 405                                 __connman_service_timeserver_remove(service,
 406                                                         dhcp->timeservers[i]);
 407                         }
 408                         g_strfreev(dhcp->timeservers);
 409                 }
 410
 411                 dhcp->timeservers = timeservers;
 412
 413                 for (i = 0; dhcp->timeservers && dhcp->timeservers[i]; i++) {
 414                         __connman_service_timeserver_append(service,
 415                                                         dhcp->timeservers[i]);
 416                 }
 417         } else {
 418                 g_strfreev(timeservers);
 419         }
 420
 421         if (g_strcmp0(pac, dhcp->pac) != 0) {
 422                 g_free(dhcp->pac);
 423                 dhcp->pac = pac;
 424
 425                 __connman_ipconfig_set_proxy_autoconfig(dhcp->ipconfig,
 426                                                                 dhcp->pac);
 427         }
 428
 429         if (connman_setting_get_bool("Enable6to4"))
 430                 __connman_6to4_probe(service);
 431
 432         return true;
 433 }
 434
 435 static void lease_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 436 {
 437         struct connman_dhcp *dhcp = user_data;
 438         GList *option = NULL;
 439         enum connman_ipconfig_method old_method;
 440         char *address, *netmask = NULL, *gateway = NULL;
 441         const char *c_address, *c_gateway;
 442         unsigned char prefixlen, c_prefixlen;
 443         bool ip_change = false;
 444
 445         DBG("Lease available");
 446
 447         if (dhcp->ipv4ll_client) {
 448                 ipv4ll_stop_client(dhcp);
 449                 dhcp_invalidate(dhcp, false);
 450         }
 451
 452         c_address = __connman_ipconfig_get_local(dhcp->ipconfig);
 453         c_gateway = __connman_ipconfig_get_gateway(dhcp->ipconfig);
 454         c_prefixlen = __connman_ipconfig_get_prefixlen(dhcp->ipconfig);
 455
 456         address = g_dhcp_client_get_address(dhcp_client);
 457
 458         __connman_ipconfig_set_dhcp_address(dhcp->ipconfig, address);
 459         DBG("last address %s", address);
 460
 461         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_SUBNET);
 462         if (option)
 463                 netmask = g_strdup(option->data);
 464
 465         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_ROUTER);
 466         if (option)
 467                 gateway = g_strdup(option->data);
 468
 469         prefixlen = connman_ipaddress_calc_netmask_len(netmask);
 470         if (prefixlen == 255)
 471                 connman_warn("netmask: %s is invalid", netmask);
 472
 473         DBG("c_address %s", c_address);
 474
 475         if (g_strcmp0(address, c_address)) {
 476                 ip_change = true;
 477                 if (c_address) {
 478                         /* Remove old ip address */
 479                         __connman_ipconfig_address_remove(dhcp->ipconfig);
 480                 }
 481         }
 482         if (g_strcmp0(gateway, c_gateway)) {
 483                 ip_change = true;
 484                 if (c_gateway) {
 485                         /* Remove gateway ip address */
 486                         __connman_ipconfig_gateway_remove(dhcp->ipconfig);
 487                 }
 488         } else if (prefixlen != c_prefixlen)
 489                 ip_change = true;
 490
 491         old_method = __connman_ipconfig_get_method(dhcp->ipconfig);
 492         __connman_ipconfig_set_method(dhcp->ipconfig,
 493                                                 CONNMAN_IPCONFIG_METHOD_DHCP);
 494
 495         /*
 496          * Notify IPv4.Configuration's method moved back to DHCP.
 497          *
 498          * This is the case ConnMan initially set an address by using
 499          * IPv4LL because DHCP failed but now we got an address from DHCP.
 500          */
 501         if (old_method == CONNMAN_IPCONFIG_METHOD_AUTO) {
 502                 struct connman_service *service =
 503                         connman_service_lookup_from_network(dhcp->network);
 504
 505                 if (service)
 506                         __connman_service_notify_ipv4_configuration(service);
 507         }
 508
 509         if (ip_change) {
 510                 __connman_ipconfig_set_local(dhcp->ipconfig, address);
 511                 __connman_ipconfig_set_prefixlen(dhcp->ipconfig, prefixlen);
 512                 __connman_ipconfig_set_gateway(dhcp->ipconfig, gateway);
 513         }
 514
 515         if (!apply_lease_available_on_network(dhcp_client, dhcp))
 516                 goto done;
 517
 518         if (ip_change)
 519                 dhcp_valid(dhcp);
 520
 521 done:
 522         g_free(address);
 523         g_free(netmask);
 524         g_free(gateway);
 525 }
 526
 527 static void ipv4ll_available_cb(GDHCPClient *ipv4ll_client, gpointer user_data)
 528 {
 529         struct connman_dhcp *dhcp = user_data;
 530         enum connman_ipconfig_method old_method;
 531         char *address, *netmask;
 532         unsigned char prefixlen;
 533
 534         DBG("IPV4LL available");
 535
 536         address = g_dhcp_client_get_address(ipv4ll_client);
 537         netmask = g_dhcp_client_get_netmask(ipv4ll_client);
 538
 539         prefixlen = connman_ipaddress_calc_netmask_len(netmask);
 540
 541         old_method = __connman_ipconfig_get_method(dhcp->ipconfig);
 542         __connman_ipconfig_set_method(dhcp->ipconfig,
 543                                                 CONNMAN_IPCONFIG_METHOD_AUTO);
 544
 545         /*
 546          * Notify IPv4.Configuration's method is AUTO now.
 547          *
 548          * This is the case DHCP failed thus ConnMan used IPv4LL to get an
 549          * address. Set IPv4.Configuration method to AUTO allows user to
 550          * ask for a DHCP address by setting the method again to DHCP.
 551          */
 552         if (old_method == CONNMAN_IPCONFIG_METHOD_DHCP) {
 553                 struct connman_service *service =
 554                         connman_service_lookup_from_network(dhcp->network);
 555
 556                 if (service)
 557                         __connman_service_notify_ipv4_configuration(service);
 558         }
 559
 560         __connman_ipconfig_set_local(dhcp->ipconfig, address);
 561         __connman_ipconfig_set_prefixlen(dhcp->ipconfig, prefixlen);
 562         __connman_ipconfig_set_gateway(dhcp->ipconfig, NULL);
 563
 564         dhcp_valid(dhcp);
 565
 566         g_free(address);
 567         g_free(netmask);
 568 }
 569
 570 static int dhcp_initialize(struct connman_dhcp *dhcp)
 571 {
 572         GDHCPClient *dhcp_client;
 573         GDHCPClientError error;
 574         int index;
 575         const char *vendor_class_id;
 576
 577         DBG("dhcp %p", dhcp);
 578
 579         index = __connman_ipconfig_get_index(dhcp->ipconfig);
 580
 581         dhcp_client = g_dhcp_client_new(G_DHCP_IPV4, index, &error);
 582         if (error != G_DHCP_CLIENT_ERROR_NONE)
 583                 return -EINVAL;
 584
 585         if (getenv("CONNMAN_DHCP_DEBUG")) {
 586                 dhcp->dhcp_debug_prefix = g_strdup_printf("DHCP index %d",
 587                                                         index);
 588                 g_dhcp_client_set_debug(dhcp_client, dhcp_debug,
 589                                         dhcp->dhcp_debug_prefix);
 590         }
 591
 592         g_dhcp_client_set_id(dhcp_client);
 593
 594         if (dhcp->network) {
 595                 struct connman_service *service;
 596                 const char *hostname;
 597
 598                 service = connman_service_lookup_from_network(dhcp->network);
 599
 600                 hostname = __connman_service_get_hostname(service);
 601                 if (!hostname)
 602                         hostname = connman_utsname_get_hostname();
 603
 604                 if (hostname)
 605                         g_dhcp_client_set_send(dhcp_client,
 606                                                 G_DHCP_HOST_NAME, hostname);
 607
 608                 g_dhcp_client_set_request(dhcp_client, G_DHCP_HOST_NAME);
 609                 g_dhcp_client_set_request(dhcp_client, G_DHCP_DNS_SERVER);
 610                 g_dhcp_client_set_request(dhcp_client, G_DHCP_DOMAIN_NAME);
 611                 g_dhcp_client_set_request(dhcp_client, G_DHCP_NTP_SERVER);
 612                 g_dhcp_client_set_request(dhcp_client, 252);
 613                 g_dhcp_client_set_request(dhcp_client, G_DHCP_MTU);
 614         }
 615
 616         g_dhcp_client_set_request(dhcp_client, G_DHCP_ROUTER);
 617         g_dhcp_client_set_request(dhcp_client, G_DHCP_SUBNET);
 618
 619         vendor_class_id = connman_option_get_string("VendorClassID");
 620         if (vendor_class_id)
 621                 g_dhcp_client_set_send(dhcp_client, G_DHCP_VENDOR_CLASS_ID,
 622                                         vendor_class_id);
 623
 624         g_dhcp_client_register_event(dhcp_client,
 625                         G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE,
 626                                                 lease_available_cb, dhcp);
 627
 628         g_dhcp_client_register_event(dhcp_client,
 629                         G_DHCP_CLIENT_EVENT_LEASE_LOST, lease_lost_cb, dhcp);
 630
 631         g_dhcp_client_register_event(dhcp_client,
 632                         G_DHCP_CLIENT_EVENT_NO_LEASE, no_lease_cb, dhcp);
 633
 634         dhcp->dhcp_client = dhcp_client;
 635
 636         return 0;
 637 }
 638
 639 static int dhcp_release(struct connman_dhcp *dhcp)
 640 {
 641         DBG("dhcp %p", dhcp);
 642
 643         if (dhcp->timeout > 0) {
 644                 g_source_remove(dhcp->timeout);
 645                 dhcp->timeout = 0;
 646         }
 647
 648         if (dhcp->dhcp_client) {
 649                 g_dhcp_client_stop(dhcp->dhcp_client);
 650                 g_dhcp_client_unref(dhcp->dhcp_client);
 651         }
 652
 653         dhcp->dhcp_client = NULL;
 654
 655         g_free(dhcp->dhcp_debug_prefix);
 656         dhcp->dhcp_debug_prefix = NULL;
 657
 658         ipv4ll_stop_client(dhcp);
 659
 660         return 0;
 661 }
 662
 663 char *__connman_dhcp_get_server_address(struct connman_ipconfig *ipconfig)
 664 {
 665         struct connman_dhcp *dhcp;
 666
 667         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 668         if (!dhcp)
 669                 return NULL;
 670
 671         return g_dhcp_client_get_server_address(dhcp->dhcp_client);
 672 }
 673
 674 int __connman_dhcp_start(struct connman_ipconfig *ipconfig,
 675                         struct connman_network *network, dhcp_cb callback,
 676                         gpointer user_data)
 677 {
 678         const char *last_addr = NULL;
 679         struct connman_dhcp *dhcp;
 680         int err;
 681
 682         DBG("");
 683
 684         if (network) {
 685                 struct connman_service *service;
 686
 687                 service = connman_service_lookup_from_network(network);
 688                 if (!service)
 689                         return -EINVAL;
 690         }
 691
 692         last_addr = __connman_ipconfig_get_dhcp_address(ipconfig);
 693
 694         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 695         if (!dhcp) {
 696
 697                 dhcp = g_try_new0(struct connman_dhcp, 1);
 698                 if (!dhcp)
 699                         return -ENOMEM;
 700
 701                 dhcp->ipconfig = ipconfig;
 702                 __connman_ipconfig_ref(ipconfig);
 703
 704                 if (network) {
 705                         dhcp->network = network;
 706                         connman_network_ref(network);
 707                 }
 708
 709                 err = dhcp_initialize(dhcp);
 710
 711                 if (err < 0) {
 712                         if (network)
 713                                 connman_network_unref(network);
 714                         g_free(dhcp);
 715                         return err;
 716                 }
 717
 718                 g_hash_table_insert(ipconfig_table, ipconfig, dhcp);
 719         }
 720
 721         dhcp->callback = callback;
 722         dhcp->user_data = user_data;
 723
 724         return g_dhcp_client_start(dhcp->dhcp_client, last_addr);
 725 }
 726
 727 void __connman_dhcp_stop(struct connman_ipconfig *ipconfig)
 728 {
 729         struct connman_dhcp *dhcp;
 730
 731         DBG("ipconfig_table %p ipconfig %p", ipconfig_table, ipconfig);
 732
 733         if (!ipconfig_table)
 734                 return;
 735
 736         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 737         if (dhcp) {
 738                 g_hash_table_remove(ipconfig_table, ipconfig);
 739                 __connman_ipconfig_unref(ipconfig);
 740                 if (dhcp->network)
 741                         connman_network_unref(dhcp->network);
 742                 dhcp_release(dhcp);
 743                 dhcp_invalidate(dhcp, false);
 744                 dhcp_free(dhcp);
 745         }
 746 }
 747
 748 void __connman_dhcp_decline(struct connman_ipconfig *ipconfig)
 749 {
 750         struct connman_dhcp *dhcp;
 751         const char *address;
 752         struct in_addr addr;
 753
 754         DBG("ipconfig_table %p ipconfig %p", ipconfig_table, ipconfig);
 755
 756         if (!ipconfig_table)
 757                 return;
 758
 759         dhcp = g_hash_table_lookup(ipconfig_table, ipconfig);
 760         if (dhcp) {
 761                 address = __connman_ipconfig_get_local(ipconfig);
 762                 if (!address)
 763                         return;
 764
 765                 if (inet_pton(AF_INET, address, &addr) != 1)
 766                         connman_error("Could not convert address %s", address);
 767
 768                 g_dhcp_client_decline(dhcp->dhcp_client, htonl(addr.s_addr));
 769         }
 770 }
 771
 772 int __connman_dhcp_init(void)
 773 {
 774         DBG("");
 775
 776         ipconfig_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
 777                                                                 NULL, NULL);
 778
 779         return 0;
 780 }
 781
 782 void __connman_dhcp_cleanup(void)
 783 {
 784         DBG("");
 785
 786         g_hash_table_destroy(ipconfig_table);
 787         ipconfig_table = NULL;
 788 }