src/dhcp.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2010  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
  32 #include <gdhcp/gdhcp.h>
  33
  34 #include <glib.h>
  35
  36 #include "connman.h"
  37
  38 struct connman_dhcp {
  39         struct connman_network *network;
  40         dhcp_cb callback;
  41
  42         char **nameservers;
  43         char *timeserver;
  44         char *pac;
  45
  46         GDHCPClient *dhcp_client;
  47 };
  48
  49 static GHashTable *network_table;
  50
  51 static void dhcp_free(struct connman_dhcp *dhcp)
  52 {
  53         g_strfreev(dhcp->nameservers);
  54         g_free(dhcp->timeserver);
  55         g_free(dhcp->pac);
  56
  57         dhcp->nameservers = NULL;
  58         dhcp->timeserver = NULL;
  59         dhcp->pac = NULL;
  60 }
  61
  62 static void dhcp_invalid(struct connman_dhcp *dhcp)
  63 {
  64         struct connman_service *service;
  65         struct connman_ipconfig *ipconfig;
  66         int i;
  67
  68         service = __connman_service_lookup_from_network(dhcp->network);
  69         if (service == NULL)
  70                 return;
  71
  72         ipconfig = __connman_service_get_ip4config(service);
  73         if (ipconfig == NULL)
  74                 return;
  75
  76         __connman_6to4_remove(ipconfig);
  77
  78         __connman_service_set_domainname(service, NULL);
  79         __connman_service_set_pac(service, NULL);
  80         __connman_service_timeserver_remove(service, dhcp->timeserver);
  81
  82         for (i = 0; dhcp->nameservers[i] != NULL; i++) {
  83                 __connman_service_nameserver_remove(service,
  84                                                 dhcp->nameservers[i]);
  85         }
  86
  87         __connman_ipconfig_set_local(ipconfig, NULL);
  88         __connman_ipconfig_set_broadcast(ipconfig, NULL);
  89         __connman_ipconfig_set_gateway(ipconfig, NULL);
  90         __connman_ipconfig_set_prefixlen(ipconfig, 0);
  91
  92         if (dhcp->callback != NULL)
  93                 dhcp->callback(dhcp->network, FALSE);
  94
  95         dhcp_free(dhcp);
  96 }
  97
  98 static void dhcp_valid(struct connman_dhcp *dhcp)
  99 {
 100         if (dhcp->callback != NULL)
 101                 dhcp->callback(dhcp->network, TRUE);
 102 }
 103
 104 static void no_lease_cb(GDHCPClient *dhcp_client, gpointer user_data)
 105 {
 106         struct connman_dhcp *dhcp = user_data;
 107
 108         DBG("No lease available");
 109
 110         dhcp_invalid(dhcp);
 111 }
 112
 113 static void lease_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 114 {
 115         struct connman_dhcp *dhcp = user_data;
 116
 117         DBG("Lease lost");
 118
 119         dhcp_invalid(dhcp);
 120 }
 121
 122 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 123 {
 124         struct connman_dhcp *dhcp = user_data;
 125
 126         DBG("Lease lost");
 127
 128         dhcp_invalid(dhcp);
 129 }
 130
 131
 132 static gboolean compare_string_arrays(char **array_a, char **array_b)
 133 {
 134         int i;
 135
 136         if (array_a == NULL || array_b == NULL)
 137                 return FALSE;
 138
 139         if (g_strv_length(array_a) != g_strv_length(array_b))
 140                 return FALSE;
 141
 142         for (i = 0; array_a[i] != NULL &&
 143                              array_b[i] != NULL; i++) {
 144                 if (g_strcmp0(array_a[i], array_b[i]) != 0)
 145                         return FALSE;
 146         }
 147
 148         return TRUE;
 149 }
 150
 151 static void lease_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 152 {
 153         struct connman_dhcp *dhcp = user_data;
 154         GList *list, *option = NULL;
 155         char *address, *netmask = NULL, *gateway = NULL;
 156         const char *c_address, *c_gateway;
 157         char *domainname = NULL, *hostname = NULL;
 158         char **nameservers, *timeserver = NULL, *pac = NULL;
 159         int ns_entries;
 160         struct connman_ipconfig *ipconfig;
 161         struct connman_service *service;
 162         unsigned char prefixlen, c_prefixlen;
 163         gboolean ip_change;
 164         int i;
 165
 166         DBG("Lease available");
 167
 168         service = __connman_service_lookup_from_network(dhcp->network);
 169         if (service == NULL) {
 170                 connman_error("Can not lookup service");
 171                 return;
 172         }
 173
 174         ipconfig = __connman_service_get_ip4config(service);
 175         if (ipconfig == NULL) {
 176                 connman_error("Could not lookup ipconfig");
 177                 return;
 178         }
 179
 180         c_address = __connman_ipconfig_get_local(ipconfig);
 181         c_gateway = __connman_ipconfig_get_gateway(ipconfig);
 182         c_prefixlen = __connman_ipconfig_get_prefixlen(ipconfig);
 183
 184         address = g_dhcp_client_get_address(dhcp_client);
 185
 186         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_SUBNET);
 187         if (option != NULL)
 188                 netmask = g_strdup(option->data);
 189
 190         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_ROUTER);
 191         if (option != NULL)
 192                 gateway = g_strdup(option->data);
 193
 194         prefixlen = __connman_ipconfig_netmask_prefix_len(netmask);
 195
 196         DBG("c_address %s", c_address);
 197
 198         if (address != NULL && c_address != NULL &&
 199                                         g_strcmp0(address, c_address) != 0)
 200                 ip_change = TRUE;
 201         else if (gateway != NULL && c_gateway != NULL &&
 202                                         g_strcmp0(gateway, c_gateway) != 0)
 203                 ip_change = TRUE;
 204         else if (prefixlen != c_prefixlen)
 205                 ip_change = TRUE;
 206         else if (c_address == NULL || c_gateway == NULL)
 207                 ip_change = TRUE;
 208         else
 209                 ip_change = FALSE;
 210
 211         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DNS_SERVER);
 212         for (ns_entries = 0, list = option; list; list = list->next)
 213                 ns_entries += 1;
 214         nameservers = g_try_new0(char *, ns_entries + 1);
 215         if (nameservers != NULL) {
 216                 for (i = 0, list = option; list; list = list->next, i++)
 217                         nameservers[i] = g_strdup(list->data);
 218                 nameservers[ns_entries] = NULL;
 219         }
 220
 221         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DOMAIN_NAME);
 222         if (option != NULL)
 223                 domainname = g_strdup(option->data);
 224
 225         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_HOST_NAME);
 226         if (option != NULL)
 227                 hostname = g_strdup(option->data);
 228
 229         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_NTP_SERVER);
 230         if (option != NULL)
 231                 timeserver = g_strdup(option->data);
 232
 233         option = g_dhcp_client_get_option(dhcp_client, 252);
 234         if (option != NULL)
 235                 pac = g_strdup(option->data);
 236
 237         connman_ipconfig_set_method(ipconfig, CONNMAN_IPCONFIG_METHOD_DHCP);
 238
 239         if (ip_change == TRUE) {
 240                 __connman_ipconfig_set_local(ipconfig, address);
 241                 __connman_ipconfig_set_prefixlen(ipconfig, prefixlen);
 242                 __connman_ipconfig_set_gateway(ipconfig, gateway);
 243         }
 244
 245         if (compare_string_arrays(nameservers, dhcp->nameservers) == FALSE) {
 246                 if (dhcp->nameservers != NULL) {
 247                         for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 248                                 __connman_service_nameserver_remove(service,
 249                                                         dhcp->nameservers[i]);
 250                         }
 251                         g_strfreev(dhcp->nameservers);
 252                 }
 253
 254                 dhcp->nameservers = nameservers;
 255
 256                 for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 257                         __connman_service_nameserver_append(service,
 258                                                         dhcp->nameservers[i]);
 259                 }
 260         }
 261
 262         if (g_strcmp0(timeserver, dhcp->timeserver) != 0) {
 263                 if (dhcp->timeserver != NULL) {
 264                         __connman_service_timeserver_remove(service,
 265                                                         dhcp->timeserver);
 266                         g_free(dhcp->timeserver);
 267                 }
 268
 269                 dhcp->timeserver = timeserver;
 270
 271                 if (dhcp->timeserver != NULL)
 272                         __connman_service_timeserver_append(service,
 273                                                         dhcp->timeserver);
 274         }
 275
 276         if (g_strcmp0(pac, dhcp->pac) != 0) {
 277                 g_free(dhcp->pac);
 278                 dhcp->pac = pac;
 279
 280                 __connman_service_set_pac(service, dhcp->pac);
 281         }
 282
 283         __connman_service_set_domainname(service, domainname);
 284
 285         if (domainname != NULL)
 286                 __connman_utsname_set_domainname(domainname);
 287
 288         if (hostname != NULL)
 289                 __connman_utsname_set_hostname(hostname);
 290
 291         if (ip_change == TRUE)
 292                 dhcp_valid(dhcp);
 293
 294         __connman_6to4_probe(service);
 295
 296         g_free(address);
 297         g_free(netmask);
 298         g_free(gateway);
 299         g_free(domainname);
 300         g_free(hostname);
 301 }
 302
 303 static void ipv4ll_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 304 {
 305         struct connman_dhcp *dhcp = user_data;
 306         char *address, *netmask;
 307         struct connman_service *service;
 308         struct connman_ipconfig *ipconfig;
 309         unsigned char prefixlen;
 310
 311         DBG("IPV4LL available");
 312
 313         service = __connman_service_lookup_from_network(dhcp->network);
 314         if (service == NULL)
 315                 return;
 316
 317         ipconfig = __connman_service_get_ip4config(service);
 318         if (ipconfig == NULL)
 319                 return;
 320
 321         address = g_dhcp_client_get_address(dhcp_client);
 322         netmask = g_dhcp_client_get_netmask(dhcp_client);
 323
 324         prefixlen = __connman_ipconfig_netmask_prefix_len(netmask);
 325
 326         connman_ipconfig_set_method(ipconfig, CONNMAN_IPCONFIG_METHOD_DHCP);
 327         __connman_ipconfig_set_local(ipconfig, address);
 328         __connman_ipconfig_set_prefixlen(ipconfig, prefixlen);
 329         __connman_ipconfig_set_gateway(ipconfig, NULL);
 330
 331         dhcp_valid(dhcp);
 332
 333         g_free(address);
 334         g_free(netmask);
 335 }
 336
 337 static void dhcp_debug(const char *str, void *data)
 338 {
 339         connman_info("%s: %s\n", (const char *) data, str);
 340 }
 341
 342 static int dhcp_request(struct connman_dhcp *dhcp)
 343 {
 344         GDHCPClient *dhcp_client;
 345         GDHCPClientError error;
 346         const char *hostname;
 347         int index;
 348
 349         DBG("dhcp %p", dhcp);
 350
 351         index = connman_network_get_index(dhcp->network);
 352
 353         dhcp_client = g_dhcp_client_new(G_DHCP_IPV4, index, &error);
 354         if (error != G_DHCP_CLIENT_ERROR_NONE)
 355                 return -EINVAL;
 356
 357         if (getenv("CONNMAN_DHCP_DEBUG"))
 358                 g_dhcp_client_set_debug(dhcp_client, dhcp_debug, "DHCP");
 359
 360         hostname = connman_utsname_get_hostname();
 361         if (hostname != NULL)
 362                 g_dhcp_client_set_send(dhcp_client, G_DHCP_HOST_NAME, hostname);
 363
 364         g_dhcp_client_set_request(dhcp_client, G_DHCP_HOST_NAME);
 365         g_dhcp_client_set_request(dhcp_client, G_DHCP_SUBNET);
 366         g_dhcp_client_set_request(dhcp_client, G_DHCP_DNS_SERVER);
 367         g_dhcp_client_set_request(dhcp_client, G_DHCP_DOMAIN_NAME);
 368         g_dhcp_client_set_request(dhcp_client, G_DHCP_NTP_SERVER);
 369         g_dhcp_client_set_request(dhcp_client, G_DHCP_ROUTER);
 370         g_dhcp_client_set_request(dhcp_client, 252);
 371
 372         g_dhcp_client_register_event(dhcp_client,
 373                         G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE,
 374                                                 lease_available_cb, dhcp);
 375
 376         g_dhcp_client_register_event(dhcp_client,
 377                         G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE,
 378                                                 ipv4ll_available_cb, dhcp);
 379
 380         g_dhcp_client_register_event(dhcp_client,
 381                         G_DHCP_CLIENT_EVENT_LEASE_LOST, lease_lost_cb, dhcp);
 382
 383         g_dhcp_client_register_event(dhcp_client,
 384                         G_DHCP_CLIENT_EVENT_IPV4LL_LOST, ipv4ll_lost_cb, dhcp);
 385
 386         g_dhcp_client_register_event(dhcp_client,
 387                         G_DHCP_CLIENT_EVENT_NO_LEASE, no_lease_cb, dhcp);
 388
 389         dhcp->dhcp_client = dhcp_client;
 390
 391         return g_dhcp_client_start(dhcp_client);
 392 }
 393
 394 static int dhcp_release(struct connman_dhcp *dhcp)
 395 {
 396         DBG("dhcp %p", dhcp);
 397
 398         if (dhcp->dhcp_client == NULL)
 399                 return 0;
 400
 401         g_dhcp_client_stop(dhcp->dhcp_client);
 402         g_dhcp_client_unref(dhcp->dhcp_client);
 403
 404         dhcp->dhcp_client = NULL;
 405
 406         return 0;
 407 }
 408
 409 static void remove_network(gpointer user_data)
 410 {
 411         struct connman_dhcp *dhcp = user_data;
 412
 413         DBG("dhcp %p", dhcp);
 414
 415         dhcp_release(dhcp);
 416
 417         dhcp_free(dhcp);
 418         g_free(dhcp);
 419 }
 420
 421 int __connman_dhcp_start(struct connman_network *network, dhcp_cb callback)
 422 {
 423         struct connman_dhcp *dhcp;
 424
 425         DBG("");
 426
 427         dhcp = g_try_new0(struct connman_dhcp, 1);
 428         if (dhcp == NULL)
 429                 return -ENOMEM;
 430
 431         dhcp->network = network;
 432         dhcp->callback = callback;
 433
 434         g_hash_table_replace(network_table, network, dhcp);
 435
 436         return dhcp_request(dhcp);
 437 }
 438
 439 void __connman_dhcp_stop(struct connman_network *network)
 440 {
 441         DBG("");
 442
 443         g_hash_table_remove(network_table, network);
 444 }
 445
 446 int __connman_dhcp_init(void)
 447 {
 448         DBG("");
 449
 450         network_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
 451                                                         NULL, remove_network);
 452
 453         return 0;
 454 }
 455
 456 void __connman_dhcp_cleanup(void)
 457 {
 458         DBG("");
 459
 460         g_hash_table_destroy(network_table);
 461 }