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 /**
  63  * dhcp_invalidate: Invalidate an existing DHCP lease
  64  * @dhcp: pointer to the DHCP lease to invalidate.
  65  * @callback: flag indicating whether or not to invoke the client callback
  66  *            if present.
  67  *
  68  * Invalidates an existing DHCP lease, optionally invoking the client
  69  * callback. The caller may wish to avoid the client callback invocation
  70  * when the invocation of that callback might otherwise unnecessarily upset
  71  * service state due to the IP configuration change implied by this
  72  * invalidation.
  73  */
  74 static void dhcp_invalidate(struct connman_dhcp *dhcp, connman_bool_t callback)
  75 {
  76         struct connman_service *service;
  77         struct connman_ipconfig *ipconfig;
  78         int i;
  79
  80         DBG("dhcp %p callback %u", dhcp, callback);
  81
  82         if (dhcp == NULL)
  83                 return;
  84
  85         service = __connman_service_lookup_from_network(dhcp->network);
  86         if (service == NULL)
  87                 return;
  88
  89         ipconfig = __connman_service_get_ip4config(service);
  90         if (ipconfig == NULL)
  91                 return;
  92
  93         __connman_6to4_remove(ipconfig);
  94
  95         __connman_service_set_domainname(service, NULL);
  96         __connman_service_set_pac(service, NULL);
  97         __connman_service_timeserver_remove(service, dhcp->timeserver);
  98
  99         for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 100                 __connman_service_nameserver_remove(service,
 101                                                 dhcp->nameservers[i]);
 102         }
 103
 104         __connman_ipconfig_set_local(ipconfig, NULL);
 105         __connman_ipconfig_set_broadcast(ipconfig, NULL);
 106         __connman_ipconfig_set_gateway(ipconfig, NULL);
 107         __connman_ipconfig_set_prefixlen(ipconfig, 0);
 108
 109         if (dhcp->callback != NULL && callback)
 110                 dhcp->callback(dhcp->network, FALSE);
 111
 112         dhcp_free(dhcp);
 113 }
 114
 115 static void dhcp_valid(struct connman_dhcp *dhcp)
 116 {
 117         if (dhcp->callback != NULL)
 118                 dhcp->callback(dhcp->network, TRUE);
 119 }
 120
 121 static void no_lease_cb(GDHCPClient *dhcp_client, gpointer user_data)
 122 {
 123         struct connman_dhcp *dhcp = user_data;
 124
 125         DBG("No lease available");
 126
 127         dhcp_invalidate(dhcp, TRUE);
 128 }
 129
 130 static void lease_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 131 {
 132         struct connman_dhcp *dhcp = user_data;
 133
 134         DBG("Lease lost");
 135
 136         dhcp_invalidate(dhcp, TRUE);
 137 }
 138
 139 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 140 {
 141         struct connman_dhcp *dhcp = user_data;
 142
 143         DBG("Lease lost");
 144
 145         dhcp_invalidate(dhcp, TRUE);
 146 }
 147
 148
 149 static gboolean compare_string_arrays(char **array_a, char **array_b)
 150 {
 151         int i;
 152
 153         if (array_a == NULL || array_b == NULL)
 154                 return FALSE;
 155
 156         if (g_strv_length(array_a) != g_strv_length(array_b))
 157                 return FALSE;
 158
 159         for (i = 0; array_a[i] != NULL &&
 160                              array_b[i] != NULL; i++) {
 161                 if (g_strcmp0(array_a[i], array_b[i]) != 0)
 162                         return FALSE;
 163         }
 164
 165         return TRUE;
 166 }
 167
 168 static void lease_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 169 {
 170         struct connman_dhcp *dhcp = user_data;
 171         GList *list, *option = NULL;
 172         char *address, *netmask = NULL, *gateway = NULL;
 173         const char *c_address, *c_gateway;
 174         char *domainname = NULL, *hostname = NULL;
 175         char **nameservers, *timeserver = NULL, *pac = NULL;
 176         int ns_entries;
 177         struct connman_ipconfig *ipconfig;
 178         struct connman_service *service;
 179         unsigned char prefixlen, c_prefixlen;
 180         gboolean ip_change;
 181         int i;
 182
 183         DBG("Lease available");
 184
 185         service = __connman_service_lookup_from_network(dhcp->network);
 186         if (service == NULL) {
 187                 connman_error("Can not lookup service");
 188                 return;
 189         }
 190
 191         ipconfig = __connman_service_get_ip4config(service);
 192         if (ipconfig == NULL) {
 193                 connman_error("Could not lookup ipconfig");
 194                 return;
 195         }
 196
 197         c_address = __connman_ipconfig_get_local(ipconfig);
 198         c_gateway = __connman_ipconfig_get_gateway(ipconfig);
 199         c_prefixlen = __connman_ipconfig_get_prefixlen(ipconfig);
 200
 201         address = g_dhcp_client_get_address(dhcp_client);
 202
 203         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_SUBNET);
 204         if (option != NULL)
 205                 netmask = g_strdup(option->data);
 206
 207         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_ROUTER);
 208         if (option != NULL)
 209                 gateway = g_strdup(option->data);
 210
 211         prefixlen = __connman_ipconfig_netmask_prefix_len(netmask);
 212
 213         DBG("c_address %s", c_address);
 214
 215         if (address != NULL && c_address != NULL &&
 216                                         g_strcmp0(address, c_address) != 0)
 217                 ip_change = TRUE;
 218         else if (gateway != NULL && c_gateway != NULL &&
 219                                         g_strcmp0(gateway, c_gateway) != 0)
 220                 ip_change = TRUE;
 221         else if (prefixlen != c_prefixlen)
 222                 ip_change = TRUE;
 223         else if (c_address == NULL || c_gateway == NULL)
 224                 ip_change = TRUE;
 225         else
 226                 ip_change = FALSE;
 227
 228         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DNS_SERVER);
 229         for (ns_entries = 0, list = option; list; list = list->next)
 230                 ns_entries += 1;
 231         nameservers = g_try_new0(char *, ns_entries + 1);
 232         if (nameservers != NULL) {
 233                 for (i = 0, list = option; list; list = list->next, i++)
 234                         nameservers[i] = g_strdup(list->data);
 235                 nameservers[ns_entries] = NULL;
 236         }
 237
 238         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DOMAIN_NAME);
 239         if (option != NULL)
 240                 domainname = g_strdup(option->data);
 241
 242         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_HOST_NAME);
 243         if (option != NULL)
 244                 hostname = g_strdup(option->data);
 245
 246         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_NTP_SERVER);
 247         if (option != NULL)
 248                 timeserver = g_strdup(option->data);
 249
 250         option = g_dhcp_client_get_option(dhcp_client, 252);
 251         if (option != NULL)
 252                 pac = g_strdup(option->data);
 253
 254         connman_ipconfig_set_method(ipconfig, CONNMAN_IPCONFIG_METHOD_DHCP);
 255
 256         if (ip_change == TRUE) {
 257                 __connman_ipconfig_set_local(ipconfig, address);
 258                 __connman_ipconfig_set_prefixlen(ipconfig, prefixlen);
 259                 __connman_ipconfig_set_gateway(ipconfig, gateway);
 260         }
 261
 262         if (compare_string_arrays(nameservers, dhcp->nameservers) == FALSE) {
 263                 if (dhcp->nameservers != NULL) {
 264                         for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 265                                 __connman_service_nameserver_remove(service,
 266                                                         dhcp->nameservers[i]);
 267                         }
 268                         g_strfreev(dhcp->nameservers);
 269                 }
 270
 271                 dhcp->nameservers = nameservers;
 272
 273                 for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 274                         __connman_service_nameserver_append(service,
 275                                                         dhcp->nameservers[i]);
 276                 }
 277         }
 278
 279         if (g_strcmp0(timeserver, dhcp->timeserver) != 0) {
 280                 if (dhcp->timeserver != NULL) {
 281                         __connman_service_timeserver_remove(service,
 282                                                         dhcp->timeserver);
 283                         g_free(dhcp->timeserver);
 284                 }
 285
 286                 dhcp->timeserver = timeserver;
 287
 288                 if (dhcp->timeserver != NULL)
 289                         __connman_service_timeserver_append(service,
 290                                                         dhcp->timeserver);
 291         }
 292
 293         if (g_strcmp0(pac, dhcp->pac) != 0) {
 294                 g_free(dhcp->pac);
 295                 dhcp->pac = pac;
 296
 297                 __connman_service_set_pac(service, dhcp->pac);
 298         }
 299
 300         __connman_service_set_domainname(service, domainname);
 301
 302         if (domainname != NULL)
 303                 __connman_utsname_set_domainname(domainname);
 304
 305         if (hostname != NULL)
 306                 __connman_utsname_set_hostname(hostname);
 307
 308         if (ip_change == TRUE)
 309                 dhcp_valid(dhcp);
 310
 311         __connman_6to4_probe(service);
 312
 313         g_free(address);
 314         g_free(netmask);
 315         g_free(gateway);
 316         g_free(domainname);
 317         g_free(hostname);
 318 }
 319
 320 static void ipv4ll_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 321 {
 322         struct connman_dhcp *dhcp = user_data;
 323         char *address, *netmask;
 324         struct connman_service *service;
 325         struct connman_ipconfig *ipconfig;
 326         unsigned char prefixlen;
 327
 328         DBG("IPV4LL available");
 329
 330         service = __connman_service_lookup_from_network(dhcp->network);
 331         if (service == NULL)
 332                 return;
 333
 334         ipconfig = __connman_service_get_ip4config(service);
 335         if (ipconfig == NULL)
 336                 return;
 337
 338         address = g_dhcp_client_get_address(dhcp_client);
 339         netmask = g_dhcp_client_get_netmask(dhcp_client);
 340
 341         prefixlen = __connman_ipconfig_netmask_prefix_len(netmask);
 342
 343         connman_ipconfig_set_method(ipconfig, CONNMAN_IPCONFIG_METHOD_DHCP);
 344         __connman_ipconfig_set_local(ipconfig, address);
 345         __connman_ipconfig_set_prefixlen(ipconfig, prefixlen);
 346         __connman_ipconfig_set_gateway(ipconfig, NULL);
 347
 348         dhcp_valid(dhcp);
 349
 350         g_free(address);
 351         g_free(netmask);
 352 }
 353
 354 static void dhcp_debug(const char *str, void *data)
 355 {
 356         connman_info("%s: %s\n", (const char *) data, str);
 357 }
 358
 359 static int dhcp_request(struct connman_dhcp *dhcp)
 360 {
 361         GDHCPClient *dhcp_client;
 362         GDHCPClientError error;
 363         const char *hostname;
 364         int index;
 365
 366         DBG("dhcp %p", dhcp);
 367
 368         index = connman_network_get_index(dhcp->network);
 369
 370         dhcp_client = g_dhcp_client_new(G_DHCP_IPV4, index, &error);
 371         if (error != G_DHCP_CLIENT_ERROR_NONE)
 372                 return -EINVAL;
 373
 374         if (getenv("CONNMAN_DHCP_DEBUG"))
 375                 g_dhcp_client_set_debug(dhcp_client, dhcp_debug, "DHCP");
 376
 377         hostname = connman_utsname_get_hostname();
 378         if (hostname != NULL)
 379                 g_dhcp_client_set_send(dhcp_client, G_DHCP_HOST_NAME, hostname);
 380
 381         g_dhcp_client_set_request(dhcp_client, G_DHCP_HOST_NAME);
 382         g_dhcp_client_set_request(dhcp_client, G_DHCP_SUBNET);
 383         g_dhcp_client_set_request(dhcp_client, G_DHCP_DNS_SERVER);
 384         g_dhcp_client_set_request(dhcp_client, G_DHCP_DOMAIN_NAME);
 385         g_dhcp_client_set_request(dhcp_client, G_DHCP_NTP_SERVER);
 386         g_dhcp_client_set_request(dhcp_client, G_DHCP_ROUTER);
 387         g_dhcp_client_set_request(dhcp_client, 252);
 388
 389         g_dhcp_client_register_event(dhcp_client,
 390                         G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE,
 391                                                 lease_available_cb, dhcp);
 392
 393         g_dhcp_client_register_event(dhcp_client,
 394                         G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE,
 395                                                 ipv4ll_available_cb, dhcp);
 396
 397         g_dhcp_client_register_event(dhcp_client,
 398                         G_DHCP_CLIENT_EVENT_LEASE_LOST, lease_lost_cb, dhcp);
 399
 400         g_dhcp_client_register_event(dhcp_client,
 401                         G_DHCP_CLIENT_EVENT_IPV4LL_LOST, ipv4ll_lost_cb, dhcp);
 402
 403         g_dhcp_client_register_event(dhcp_client,
 404                         G_DHCP_CLIENT_EVENT_NO_LEASE, no_lease_cb, dhcp);
 405
 406         dhcp->dhcp_client = dhcp_client;
 407
 408         return g_dhcp_client_start(dhcp_client);
 409 }
 410
 411 static int dhcp_release(struct connman_dhcp *dhcp)
 412 {
 413         DBG("dhcp %p", dhcp);
 414
 415         if (dhcp->dhcp_client == NULL)
 416                 return 0;
 417
 418         g_dhcp_client_stop(dhcp->dhcp_client);
 419         g_dhcp_client_unref(dhcp->dhcp_client);
 420
 421         dhcp->dhcp_client = NULL;
 422
 423         return 0;
 424 }
 425
 426 static void remove_network(gpointer user_data)
 427 {
 428         struct connman_dhcp *dhcp = user_data;
 429
 430         DBG("dhcp %p", dhcp);
 431
 432         dhcp_invalidate(dhcp, FALSE);
 433         dhcp_release(dhcp);
 434
 435         g_free(dhcp);
 436 }
 437
 438 int __connman_dhcp_start(struct connman_network *network, dhcp_cb callback)
 439 {
 440         struct connman_dhcp *dhcp;
 441
 442         DBG("");
 443
 444         dhcp = g_try_new0(struct connman_dhcp, 1);
 445         if (dhcp == NULL)
 446                 return -ENOMEM;
 447
 448         dhcp->network = network;
 449         dhcp->callback = callback;
 450
 451         g_hash_table_replace(network_table, network, dhcp);
 452
 453         return dhcp_request(dhcp);
 454 }
 455
 456 void __connman_dhcp_stop(struct connman_network *network)
 457 {
 458         DBG("");
 459
 460         g_hash_table_remove(network_table, network);
 461 }
 462
 463 int __connman_dhcp_init(void)
 464 {
 465         DBG("");
 466
 467         network_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
 468                                                         NULL, remove_network);
 469
 470         return 0;
 471 }
 472
 473 void __connman_dhcp_cleanup(void)
 474 {
 475         DBG("");
 476
 477         g_hash_table_destroy(network_table);
 478 }