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