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         if (dhcp->nameservers != NULL) {
 100                 for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 101                         __connman_service_nameserver_remove(service,
 102                                                         dhcp->nameservers[i]);
 103                 }
 104         }
 105
 106         __connman_ipconfig_address_remove(ipconfig);
 107
 108         __connman_ipconfig_set_local(ipconfig, NULL);
 109         __connman_ipconfig_set_broadcast(ipconfig, NULL);
 110         __connman_ipconfig_set_gateway(ipconfig, NULL);
 111         __connman_ipconfig_set_prefixlen(ipconfig, 0);
 112
 113         if (dhcp->callback != NULL && callback)
 114                 dhcp->callback(dhcp->network, FALSE);
 115
 116         dhcp_free(dhcp);
 117 }
 118
 119 static void dhcp_valid(struct connman_dhcp *dhcp)
 120 {
 121         if (dhcp->callback != NULL)
 122                 dhcp->callback(dhcp->network, TRUE);
 123 }
 124
 125 static void no_lease_cb(GDHCPClient *dhcp_client, gpointer user_data)
 126 {
 127         struct connman_dhcp *dhcp = user_data;
 128
 129         DBG("No lease available");
 130
 131         dhcp_invalidate(dhcp, TRUE);
 132 }
 133
 134 static void lease_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 135 {
 136         struct connman_dhcp *dhcp = user_data;
 137
 138         DBG("Lease lost");
 139
 140         dhcp_invalidate(dhcp, TRUE);
 141 }
 142
 143 static void ipv4ll_lost_cb(GDHCPClient *dhcp_client, gpointer user_data)
 144 {
 145         struct connman_dhcp *dhcp = user_data;
 146
 147         DBG("Lease lost");
 148
 149         dhcp_invalidate(dhcp, TRUE);
 150 }
 151
 152
 153 static gboolean compare_string_arrays(char **array_a, char **array_b)
 154 {
 155         int i;
 156
 157         if (array_a == NULL || array_b == NULL)
 158                 return FALSE;
 159
 160         if (g_strv_length(array_a) != g_strv_length(array_b))
 161                 return FALSE;
 162
 163         for (i = 0; array_a[i] != NULL &&
 164                              array_b[i] != NULL; i++) {
 165                 if (g_strcmp0(array_a[i], array_b[i]) != 0)
 166                         return FALSE;
 167         }
 168
 169         return TRUE;
 170 }
 171
 172 static void lease_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 173 {
 174         struct connman_dhcp *dhcp = user_data;
 175         GList *list, *option = NULL;
 176         char *address, *netmask = NULL, *gateway = NULL;
 177         const char *c_address, *c_gateway;
 178         char *domainname = NULL, *hostname = NULL;
 179         char **nameservers, *timeserver = NULL, *pac = NULL;
 180         int ns_entries;
 181         struct connman_ipconfig *ipconfig;
 182         struct connman_service *service;
 183         unsigned char prefixlen, c_prefixlen;
 184         gboolean ip_change;
 185         int i;
 186
 187         DBG("Lease available");
 188
 189         service = __connman_service_lookup_from_network(dhcp->network);
 190         if (service == NULL) {
 191                 connman_error("Can not lookup service");
 192                 return;
 193         }
 194
 195         ipconfig = __connman_service_get_ip4config(service);
 196         if (ipconfig == NULL) {
 197                 connman_error("Could not lookup ipconfig");
 198                 return;
 199         }
 200
 201         c_address = __connman_ipconfig_get_local(ipconfig);
 202         c_gateway = __connman_ipconfig_get_gateway(ipconfig);
 203         c_prefixlen = __connman_ipconfig_get_prefixlen(ipconfig);
 204
 205         address = g_dhcp_client_get_address(dhcp_client);
 206
 207         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_SUBNET);
 208         if (option != NULL)
 209                 netmask = g_strdup(option->data);
 210
 211         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_ROUTER);
 212         if (option != NULL)
 213                 gateway = g_strdup(option->data);
 214
 215         prefixlen = __connman_ipconfig_netmask_prefix_len(netmask);
 216
 217         DBG("c_address %s", c_address);
 218
 219         if (address != NULL && c_address != NULL &&
 220                                         g_strcmp0(address, c_address) != 0)
 221                 ip_change = TRUE;
 222         else if (gateway != NULL && c_gateway != NULL &&
 223                                         g_strcmp0(gateway, c_gateway) != 0)
 224                 ip_change = TRUE;
 225         else if (prefixlen != c_prefixlen)
 226                 ip_change = TRUE;
 227         else if (c_address == NULL || c_gateway == NULL)
 228                 ip_change = TRUE;
 229         else
 230                 ip_change = FALSE;
 231
 232         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DNS_SERVER);
 233         for (ns_entries = 0, list = option; list; list = list->next)
 234                 ns_entries += 1;
 235         nameservers = g_try_new0(char *, ns_entries + 1);
 236         if (nameservers != NULL) {
 237                 for (i = 0, list = option; list; list = list->next, i++)
 238                         nameservers[i] = g_strdup(list->data);
 239                 nameservers[ns_entries] = NULL;
 240         }
 241
 242         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DOMAIN_NAME);
 243         if (option != NULL)
 244                 domainname = g_strdup(option->data);
 245
 246         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_HOST_NAME);
 247         if (option != NULL)
 248                 hostname = g_strdup(option->data);
 249
 250         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_NTP_SERVER);
 251         if (option != NULL)
 252                 timeserver = g_strdup(option->data);
 253
 254         option = g_dhcp_client_get_option(dhcp_client, 252);
 255         if (option != NULL)
 256                 pac = g_strdup(option->data);
 257
 258         connman_ipconfig_set_method(ipconfig, CONNMAN_IPCONFIG_METHOD_DHCP);
 259
 260         if (ip_change == TRUE) {
 261                 __connman_ipconfig_set_local(ipconfig, address);
 262                 __connman_ipconfig_set_prefixlen(ipconfig, prefixlen);
 263                 __connman_ipconfig_set_gateway(ipconfig, gateway);
 264         }
 265
 266         if (compare_string_arrays(nameservers, dhcp->nameservers) == FALSE) {
 267                 if (dhcp->nameservers != NULL) {
 268                         for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 269                                 __connman_service_nameserver_remove(service,
 270                                                         dhcp->nameservers[i]);
 271                         }
 272                         g_strfreev(dhcp->nameservers);
 273                 }
 274
 275                 dhcp->nameservers = nameservers;
 276
 277                 for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 278                         __connman_service_nameserver_append(service,
 279                                                         dhcp->nameservers[i]);
 280                 }
 281         }
 282
 283         if (g_strcmp0(timeserver, dhcp->timeserver) != 0) {
 284                 if (dhcp->timeserver != NULL) {
 285                         __connman_service_timeserver_remove(service,
 286                                                         dhcp->timeserver);
 287                         g_free(dhcp->timeserver);
 288                 }
 289
 290                 dhcp->timeserver = timeserver;
 291
 292                 if (dhcp->timeserver != NULL)
 293                         __connman_service_timeserver_append(service,
 294                                                         dhcp->timeserver);
 295         }
 296
 297         if (g_strcmp0(pac, dhcp->pac) != 0) {
 298                 g_free(dhcp->pac);
 299                 dhcp->pac = pac;
 300
 301                 __connman_service_set_pac(service, dhcp->pac);
 302         }
 303
 304         __connman_service_set_domainname(service, domainname);
 305
 306         if (domainname != NULL)
 307                 __connman_utsname_set_domainname(domainname);
 308
 309         if (hostname != NULL)
 310                 __connman_utsname_set_hostname(hostname);
 311
 312         if (ip_change == TRUE)
 313                 dhcp_valid(dhcp);
 314
 315         __connman_6to4_probe(service);
 316
 317         g_free(address);
 318         g_free(netmask);
 319         g_free(gateway);
 320         g_free(domainname);
 321         g_free(hostname);
 322 }
 323
 324 static void ipv4ll_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 325 {
 326         struct connman_dhcp *dhcp = user_data;
 327         char *address, *netmask;
 328         struct connman_service *service;
 329         struct connman_ipconfig *ipconfig;
 330         unsigned char prefixlen;
 331
 332         DBG("IPV4LL available");
 333
 334         service = __connman_service_lookup_from_network(dhcp->network);
 335         if (service == NULL)
 336                 return;
 337
 338         ipconfig = __connman_service_get_ip4config(service);
 339         if (ipconfig == NULL)
 340                 return;
 341
 342         address = g_dhcp_client_get_address(dhcp_client);
 343         netmask = g_dhcp_client_get_netmask(dhcp_client);
 344
 345         prefixlen = __connman_ipconfig_netmask_prefix_len(netmask);
 346
 347         connman_ipconfig_set_method(ipconfig, CONNMAN_IPCONFIG_METHOD_DHCP);
 348         __connman_ipconfig_set_local(ipconfig, address);
 349         __connman_ipconfig_set_prefixlen(ipconfig, prefixlen);
 350         __connman_ipconfig_set_gateway(ipconfig, NULL);
 351
 352         dhcp_valid(dhcp);
 353
 354         g_free(address);
 355         g_free(netmask);
 356 }
 357
 358 static void dhcp_debug(const char *str, void *data)
 359 {
 360         connman_info("%s: %s\n", (const char *) data, str);
 361 }
 362
 363 static int dhcp_request(struct connman_dhcp *dhcp)
 364 {
 365         GDHCPClient *dhcp_client;
 366         GDHCPClientError error;
 367         const char *hostname;
 368         int index;
 369
 370         DBG("dhcp %p", dhcp);
 371
 372         index = connman_network_get_index(dhcp->network);
 373
 374         dhcp_client = g_dhcp_client_new(G_DHCP_IPV4, index, &error);
 375         if (error != G_DHCP_CLIENT_ERROR_NONE)
 376                 return -EINVAL;
 377
 378         if (getenv("CONNMAN_DHCP_DEBUG"))
 379                 g_dhcp_client_set_debug(dhcp_client, dhcp_debug, "DHCP");
 380
 381         hostname = connman_utsname_get_hostname();
 382         if (hostname != NULL)
 383                 g_dhcp_client_set_send(dhcp_client, G_DHCP_HOST_NAME, hostname);
 384
 385         g_dhcp_client_set_request(dhcp_client, G_DHCP_HOST_NAME);
 386         g_dhcp_client_set_request(dhcp_client, G_DHCP_SUBNET);
 387         g_dhcp_client_set_request(dhcp_client, G_DHCP_DNS_SERVER);
 388         g_dhcp_client_set_request(dhcp_client, G_DHCP_DOMAIN_NAME);
 389         g_dhcp_client_set_request(dhcp_client, G_DHCP_NTP_SERVER);
 390         g_dhcp_client_set_request(dhcp_client, G_DHCP_ROUTER);
 391         g_dhcp_client_set_request(dhcp_client, 252);
 392
 393         g_dhcp_client_register_event(dhcp_client,
 394                         G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE,
 395                                                 lease_available_cb, dhcp);
 396
 397         g_dhcp_client_register_event(dhcp_client,
 398                         G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE,
 399                                                 ipv4ll_available_cb, dhcp);
 400
 401         g_dhcp_client_register_event(dhcp_client,
 402                         G_DHCP_CLIENT_EVENT_LEASE_LOST, lease_lost_cb, dhcp);
 403
 404         g_dhcp_client_register_event(dhcp_client,
 405                         G_DHCP_CLIENT_EVENT_IPV4LL_LOST, ipv4ll_lost_cb, dhcp);
 406
 407         g_dhcp_client_register_event(dhcp_client,
 408                         G_DHCP_CLIENT_EVENT_NO_LEASE, no_lease_cb, dhcp);
 409
 410         dhcp->dhcp_client = dhcp_client;
 411
 412         return g_dhcp_client_start(dhcp_client);
 413 }
 414
 415 static int dhcp_release(struct connman_dhcp *dhcp)
 416 {
 417         DBG("dhcp %p", dhcp);
 418
 419         if (dhcp->dhcp_client == NULL)
 420                 return 0;
 421
 422         g_dhcp_client_stop(dhcp->dhcp_client);
 423         g_dhcp_client_unref(dhcp->dhcp_client);
 424
 425         dhcp->dhcp_client = NULL;
 426
 427         return 0;
 428 }
 429
 430 static void remove_network(gpointer user_data)
 431 {
 432         struct connman_dhcp *dhcp = user_data;
 433
 434         DBG("dhcp %p", dhcp);
 435
 436         dhcp_invalidate(dhcp, FALSE);
 437         dhcp_release(dhcp);
 438
 439         g_free(dhcp);
 440 }
 441
 442 int __connman_dhcp_start(struct connman_network *network, dhcp_cb callback)
 443 {
 444         struct connman_dhcp *dhcp;
 445
 446         DBG("");
 447
 448         dhcp = g_try_new0(struct connman_dhcp, 1);
 449         if (dhcp == NULL)
 450                 return -ENOMEM;
 451
 452         dhcp->network = network;
 453         dhcp->callback = callback;
 454
 455         g_hash_table_replace(network_table, network, dhcp);
 456
 457         return dhcp_request(dhcp);
 458 }
 459
 460 void __connman_dhcp_stop(struct connman_network *network)
 461 {
 462         DBG("");
 463
 464         if (network_table == NULL)
 465                 return;
 466
 467         g_hash_table_remove(network_table, network);
 468 }
 469
 470 int __connman_dhcp_init(void)
 471 {
 472         DBG("");
 473
 474         network_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
 475                                                         NULL, remove_network);
 476
 477         return 0;
 478 }
 479
 480 void __connman_dhcp_cleanup(void)
 481 {
 482         DBG("");
 483
 484         g_hash_table_destroy(network_table);
 485         network_table = NULL;
 486 }