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                 goto out;
  88
  89         ipconfig = __connman_service_get_ip4config(service);
  90         if (ipconfig == NULL)
  91                 goto out;
  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         if (dhcp->nameservers != NULL) {
 100                 for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 101                         __connman_service_nameserver_remove(service,
 102                                                 dhcp->nameservers[i], FALSE);
 103                 }
 104         }
 105
 106         __connman_ipconfig_set_dhcp_address(ipconfig,
 107                                 __connman_ipconfig_get_local(ipconfig));
 108         DBG("last address %s", __connman_ipconfig_get_dhcp_address(ipconfig));
 109
 110         __connman_ipconfig_address_remove(ipconfig);
 111
 112         __connman_ipconfig_set_local(ipconfig, NULL);
 113         __connman_ipconfig_set_broadcast(ipconfig, NULL);
 114         __connman_ipconfig_set_gateway(ipconfig, NULL);
 115         __connman_ipconfig_set_prefixlen(ipconfig, 0);
 116
 117         if (dhcp->callback != NULL && callback)
 118                 dhcp->callback(dhcp->network, FALSE);
 119
 120 out:
 121         dhcp_free(dhcp);
 122 }
 123
 124 static void dhcp_valid(struct connman_dhcp *dhcp)
 125 {
 126         if (dhcp->callback != NULL)
 127                 dhcp->callback(dhcp->network, TRUE);
 128 }
 129
 130 static void no_lease_cb(GDHCPClient *dhcp_client, gpointer user_data)
 131 {
 132         struct connman_dhcp *dhcp = user_data;
 133
 134         DBG("No lease available");
 135
 136         dhcp_invalidate(dhcp, TRUE);
 137 }
 138
 139 static void lease_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 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 149 {
 150         struct connman_dhcp *dhcp = user_data;
 151
 152         DBG("Lease lost");
 153
 154         dhcp_invalidate(dhcp, TRUE);
 155 }
 156
 157
 158 static gboolean compare_string_arrays(char **array_a, char **array_b)
 159 {
 160         int i;
 161
 162         if (array_a == NULL || array_b == NULL)
 163                 return FALSE;
 164
 165         if (g_strv_length(array_a) != g_strv_length(array_b))
 166                 return FALSE;
 167
 168         for (i = 0; array_a[i] != NULL &&
 169                              array_b[i] != NULL; i++) {
 170                 if (g_strcmp0(array_a[i], array_b[i]) != 0)
 171                         return FALSE;
 172         }
 173
 174         return TRUE;
 175 }
 176
 177 static void lease_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 178 {
 179         struct connman_dhcp *dhcp = user_data;
 180         GList *list, *option = NULL;
 181         char *address, *netmask = NULL, *gateway = NULL;
 182         const char *c_address, *c_gateway;
 183         char *domainname = NULL, *hostname = NULL;
 184         char **nameservers, *timeserver = NULL, *pac = NULL;
 185         int ns_entries;
 186         struct connman_ipconfig *ipconfig;
 187         struct connman_service *service;
 188         unsigned char prefixlen, c_prefixlen;
 189         gboolean ip_change;
 190         int i;
 191
 192         DBG("Lease available");
 193
 194         service = __connman_service_lookup_from_network(dhcp->network);
 195         if (service == NULL) {
 196                 connman_error("Can not lookup service");
 197                 return;
 198         }
 199
 200         ipconfig = __connman_service_get_ip4config(service);
 201         if (ipconfig == NULL) {
 202                 connman_error("Could not lookup ipconfig");
 203                 return;
 204         }
 205
 206         c_address = __connman_ipconfig_get_local(ipconfig);
 207         c_gateway = __connman_ipconfig_get_gateway(ipconfig);
 208         c_prefixlen = __connman_ipconfig_get_prefixlen(ipconfig);
 209
 210         address = g_dhcp_client_get_address(dhcp_client);
 211
 212         __connman_ipconfig_set_dhcp_address(ipconfig, address);
 213         DBG("last address %s", address);
 214
 215         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_SUBNET);
 216         if (option != NULL)
 217                 netmask = g_strdup(option->data);
 218
 219         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_ROUTER);
 220         if (option != NULL)
 221                 gateway = g_strdup(option->data);
 222
 223         prefixlen = __connman_ipconfig_netmask_prefix_len(netmask);
 224
 225         DBG("c_address %s", c_address);
 226
 227         if (address != NULL && c_address != NULL &&
 228                                         g_strcmp0(address, c_address) != 0)
 229                 ip_change = TRUE;
 230         else if (gateway != NULL && c_gateway != NULL &&
 231                                         g_strcmp0(gateway, c_gateway) != 0)
 232                 ip_change = TRUE;
 233         else if (prefixlen != c_prefixlen)
 234                 ip_change = TRUE;
 235         else if (c_address == NULL || c_gateway == NULL)
 236                 ip_change = TRUE;
 237         else
 238                 ip_change = FALSE;
 239
 240         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DNS_SERVER);
 241         for (ns_entries = 0, list = option; list; list = list->next)
 242                 ns_entries += 1;
 243         nameservers = g_try_new0(char *, ns_entries + 1);
 244         if (nameservers != NULL) {
 245                 for (i = 0, list = option; list; list = list->next, i++)
 246                         nameservers[i] = g_strdup(list->data);
 247                 nameservers[ns_entries] = NULL;
 248         }
 249
 250         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DOMAIN_NAME);
 251         if (option != NULL)
 252                 domainname = g_strdup(option->data);
 253
 254         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_HOST_NAME);
 255         if (option != NULL)
 256                 hostname = g_strdup(option->data);
 257
 258         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_NTP_SERVER);
 259         if (option != NULL)
 260                 timeserver = g_strdup(option->data);
 261
 262         option = g_dhcp_client_get_option(dhcp_client, 252);
 263         if (option != NULL)
 264                 pac = g_strdup(option->data);
 265
 266         __connman_ipconfig_set_method(ipconfig, CONNMAN_IPCONFIG_METHOD_DHCP);
 267
 268         if (ip_change == TRUE) {
 269                 __connman_ipconfig_set_local(ipconfig, address);
 270                 __connman_ipconfig_set_prefixlen(ipconfig, prefixlen);
 271                 __connman_ipconfig_set_gateway(ipconfig, gateway);
 272         }
 273
 274         if (compare_string_arrays(nameservers, dhcp->nameservers) == FALSE) {
 275                 if (dhcp->nameservers != NULL) {
 276                         for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 277                                 __connman_service_nameserver_remove(service,
 278                                                 dhcp->nameservers[i], FALSE);
 279                         }
 280                         g_strfreev(dhcp->nameservers);
 281                 }
 282
 283                 dhcp->nameservers = nameservers;
 284
 285                 for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 286                         __connman_service_nameserver_append(service,
 287                                                 dhcp->nameservers[i], FALSE);
 288                 }
 289         } else {
 290                 g_strfreev(nameservers);
 291         }
 292
 293         if (g_strcmp0(timeserver, dhcp->timeserver) != 0) {
 294                 if (dhcp->timeserver != NULL) {
 295                         __connman_service_timeserver_remove(service,
 296                                                         dhcp->timeserver);
 297                         g_free(dhcp->timeserver);
 298                 }
 299
 300                 dhcp->timeserver = timeserver;
 301
 302                 if (dhcp->timeserver != NULL)
 303                         __connman_service_timeserver_append(service,
 304                                                         dhcp->timeserver);
 305         }
 306
 307         if (g_strcmp0(pac, dhcp->pac) != 0) {
 308                 g_free(dhcp->pac);
 309                 dhcp->pac = pac;
 310
 311                 __connman_service_set_pac(service, dhcp->pac);
 312         }
 313
 314         __connman_service_set_domainname(service, domainname);
 315
 316         if (domainname != NULL)
 317                 __connman_utsname_set_domainname(domainname);
 318
 319         if (hostname != NULL)
 320                 __connman_utsname_set_hostname(hostname);
 321
 322         if (ip_change == TRUE)
 323                 dhcp_valid(dhcp);
 324
 325         __connman_6to4_probe(service);
 326
 327         g_free(address);
 328         g_free(netmask);
 329         g_free(gateway);
 330         g_free(domainname);
 331         g_free(hostname);
 332 }
 333
 334 static void ipv4ll_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 335 {
 336         struct connman_dhcp *dhcp = user_data;
 337         char *address, *netmask;
 338         struct connman_service *service;
 339         struct connman_ipconfig *ipconfig;
 340         unsigned char prefixlen;
 341
 342         DBG("IPV4LL available");
 343
 344         service = __connman_service_lookup_from_network(dhcp->network);
 345         if (service == NULL)
 346                 return;
 347
 348         ipconfig = __connman_service_get_ip4config(service);
 349         if (ipconfig == NULL)
 350                 return;
 351
 352         address = g_dhcp_client_get_address(dhcp_client);
 353         netmask = g_dhcp_client_get_netmask(dhcp_client);
 354
 355         prefixlen = __connman_ipconfig_netmask_prefix_len(netmask);
 356
 357         __connman_ipconfig_set_method(ipconfig, CONNMAN_IPCONFIG_METHOD_DHCP);
 358         __connman_ipconfig_set_local(ipconfig, address);
 359         __connman_ipconfig_set_prefixlen(ipconfig, prefixlen);
 360         __connman_ipconfig_set_gateway(ipconfig, NULL);
 361
 362         dhcp_valid(dhcp);
 363
 364         g_free(address);
 365         g_free(netmask);
 366 }
 367
 368 static void dhcp_debug(const char *str, void *data)
 369 {
 370         connman_info("%s: %s\n", (const char *) data, str);
 371 }
 372
 373 static int dhcp_request(struct connman_dhcp *dhcp)
 374 {
 375         struct connman_service *service;
 376         struct connman_ipconfig *ipconfig;
 377         GDHCPClient *dhcp_client;
 378         GDHCPClientError error;
 379         const char *hostname;
 380         int index;
 381
 382         DBG("dhcp %p", dhcp);
 383
 384         index = connman_network_get_index(dhcp->network);
 385
 386         dhcp_client = g_dhcp_client_new(G_DHCP_IPV4, index, &error);
 387         if (error != G_DHCP_CLIENT_ERROR_NONE)
 388                 return -EINVAL;
 389
 390         if (getenv("CONNMAN_DHCP_DEBUG"))
 391                 g_dhcp_client_set_debug(dhcp_client, dhcp_debug, "DHCP");
 392
 393         hostname = connman_utsname_get_hostname();
 394         if (hostname != NULL)
 395                 g_dhcp_client_set_send(dhcp_client, G_DHCP_HOST_NAME, hostname);
 396
 397         g_dhcp_client_set_request(dhcp_client, G_DHCP_HOST_NAME);
 398         g_dhcp_client_set_request(dhcp_client, G_DHCP_SUBNET);
 399         g_dhcp_client_set_request(dhcp_client, G_DHCP_DNS_SERVER);
 400         g_dhcp_client_set_request(dhcp_client, G_DHCP_DOMAIN_NAME);
 401         g_dhcp_client_set_request(dhcp_client, G_DHCP_NTP_SERVER);
 402         g_dhcp_client_set_request(dhcp_client, G_DHCP_ROUTER);
 403         g_dhcp_client_set_request(dhcp_client, 252);
 404
 405         g_dhcp_client_register_event(dhcp_client,
 406                         G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE,
 407                                                 lease_available_cb, dhcp);
 408
 409         g_dhcp_client_register_event(dhcp_client,
 410                         G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE,
 411                                                 ipv4ll_available_cb, dhcp);
 412
 413         g_dhcp_client_register_event(dhcp_client,
 414                         G_DHCP_CLIENT_EVENT_LEASE_LOST, lease_lost_cb, dhcp);
 415
 416         g_dhcp_client_register_event(dhcp_client,
 417                         G_DHCP_CLIENT_EVENT_IPV4LL_LOST, ipv4ll_lost_cb, dhcp);
 418
 419         g_dhcp_client_register_event(dhcp_client,
 420                         G_DHCP_CLIENT_EVENT_NO_LEASE, no_lease_cb, dhcp);
 421
 422         dhcp->dhcp_client = dhcp_client;
 423
 424         service = __connman_service_lookup_from_network(dhcp->network);
 425         ipconfig = __connman_service_get_ip4config(service);
 426
 427         return g_dhcp_client_start(dhcp_client,
 428                                 __connman_ipconfig_get_dhcp_address(ipconfig));
 429 }
 430
 431 static int dhcp_release(struct connman_dhcp *dhcp)
 432 {
 433         DBG("dhcp %p", dhcp);
 434
 435         if (dhcp->dhcp_client == NULL)
 436                 return 0;
 437
 438         g_dhcp_client_stop(dhcp->dhcp_client);
 439         g_dhcp_client_unref(dhcp->dhcp_client);
 440
 441         dhcp->dhcp_client = NULL;
 442
 443         return 0;
 444 }
 445
 446 static void remove_network(gpointer user_data)
 447 {
 448         struct connman_dhcp *dhcp = user_data;
 449
 450         DBG("dhcp %p", dhcp);
 451
 452         dhcp_invalidate(dhcp, FALSE);
 453         dhcp_release(dhcp);
 454
 455         g_free(dhcp);
 456 }
 457
 458 int __connman_dhcp_start(struct connman_network *network, dhcp_cb callback)
 459 {
 460         struct connman_dhcp *dhcp;
 461
 462         DBG("");
 463
 464         dhcp = g_try_new0(struct connman_dhcp, 1);
 465         if (dhcp == NULL)
 466                 return -ENOMEM;
 467
 468         dhcp->network = network;
 469         dhcp->callback = callback;
 470
 471         connman_network_ref(network);
 472
 473         g_hash_table_replace(network_table, network, dhcp);
 474
 475         return dhcp_request(dhcp);
 476 }
 477
 478 void __connman_dhcp_stop(struct connman_network *network)
 479 {
 480         DBG("");
 481
 482         if (network_table == NULL)
 483                 return;
 484
 485         if (g_hash_table_remove(network_table, network) == TRUE)
 486                 connman_network_unref(network);
 487 }
 488
 489 int __connman_dhcp_init(void)
 490 {
 491         DBG("");
 492
 493         network_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
 494                                                         NULL, remove_network);
 495
 496         return 0;
 497 }
 498
 499 void __connman_dhcp_cleanup(void)
 500 {
 501         DBG("");
 502
 503         g_hash_table_destroy(network_table);
 504         network_table = NULL;
 505 }