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 static void lease_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 130 {
 131         struct connman_dhcp *dhcp = user_data;
 132         GList *list, *option = NULL;
 133         char *address, *netmask = NULL, *gateway = NULL;
 134         const char *c_address, *c_gateway;
 135         char *domainname = NULL, *hostname = NULL;
 136         int ns_entries;
 137         struct connman_ipconfig *ipconfig;
 138         struct connman_service *service;
 139         unsigned char prefixlen, c_prefixlen;
 140         gboolean ip_change;
 141         int i;
 142
 143         DBG("Lease available");
 144
 145         service = __connman_service_lookup_from_network(dhcp->network);
 146         if (service == NULL) {
 147                 connman_error("Can not lookup service");
 148                 return;
 149         }
 150
 151         ipconfig = __connman_service_get_ip4config(service);
 152         if (ipconfig == NULL) {
 153                 connman_error("Could not lookup ipconfig");
 154                 return;
 155         }
 156
 157         c_address = __connman_ipconfig_get_local(ipconfig);
 158         c_gateway = __connman_ipconfig_get_gateway(ipconfig);
 159         c_prefixlen = __connman_ipconfig_get_prefixlen(ipconfig);
 160
 161         address = g_dhcp_client_get_address(dhcp_client);
 162
 163         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_SUBNET);
 164         if (option != NULL)
 165                 netmask = g_strdup(option->data);
 166
 167         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_ROUTER);
 168         if (option != NULL)
 169                 gateway = g_strdup(option->data);
 170
 171         prefixlen = __connman_ipconfig_netmask_prefix_len(netmask);
 172
 173         DBG("c_address %s", c_address);
 174
 175         if (address != NULL && c_address != NULL &&
 176                                         g_strcmp0(address, c_address) != 0)
 177                 ip_change = TRUE;
 178         else if (gateway != NULL && c_gateway != NULL &&
 179                                         g_strcmp0(gateway, c_gateway) != 0)
 180                 ip_change = TRUE;
 181         else if (prefixlen != c_prefixlen)
 182                 ip_change = TRUE;
 183         else if (c_address == NULL || c_gateway == NULL)
 184                 ip_change = TRUE;
 185         else
 186                 ip_change = FALSE;
 187
 188
 189         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DNS_SERVER);
 190         for (ns_entries = 0, list = option; list; list = list->next)
 191                 ns_entries += 1;
 192         dhcp->nameservers = g_try_new0(char *, ns_entries + 1);
 193         if (dhcp->nameservers) {
 194                 for (i = 0, list = option; list; list = list->next, i++)
 195                         dhcp->nameservers[i] = g_strdup(list->data);
 196                 dhcp->nameservers[ns_entries] = NULL;
 197         }
 198
 199         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_DOMAIN_NAME);
 200         if (option != NULL)
 201                 domainname = g_strdup(option->data);
 202
 203         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_HOST_NAME);
 204         if (option != NULL)
 205                 hostname = g_strdup(option->data);
 206
 207         option = g_dhcp_client_get_option(dhcp_client, G_DHCP_NTP_SERVER);
 208         if (option != NULL)
 209                 dhcp->timeserver = g_strdup(option->data);
 210
 211         option = g_dhcp_client_get_option(dhcp_client, 252);
 212         if (option != NULL)
 213                 dhcp->pac = g_strdup(option->data);
 214
 215         connman_ipconfig_set_method(ipconfig, CONNMAN_IPCONFIG_METHOD_DHCP);
 216
 217         if (ip_change == TRUE) {
 218                 __connman_ipconfig_set_local(ipconfig, address);
 219                 __connman_ipconfig_set_prefixlen(ipconfig, prefixlen);
 220                 __connman_ipconfig_set_gateway(ipconfig, gateway);
 221         }
 222
 223         for (i = 0; dhcp->nameservers[i] != NULL; i++) {
 224                 __connman_service_nameserver_append(service,
 225                                         dhcp->nameservers[i]);
 226         }
 227         __connman_service_timeserver_append(service, dhcp->timeserver);
 228         __connman_service_set_pac(service, dhcp->pac);
 229         __connman_service_set_domainname(service, domainname);
 230
 231         if (domainname != NULL)
 232                 __connman_utsname_set_domainname(domainname);
 233
 234         if (hostname != NULL)
 235                 __connman_utsname_set_hostname(hostname);
 236
 237         if (ip_change == TRUE)
 238                 dhcp_valid(dhcp);
 239
 240         g_free(address);
 241         g_free(netmask);
 242         g_free(gateway);
 243         g_free(domainname);
 244         g_free(hostname);
 245 }
 246
 247 static void ipv4ll_available_cb(GDHCPClient *dhcp_client, gpointer user_data)
 248 {
 249         struct connman_dhcp *dhcp = user_data;
 250         char *address, *netmask;
 251         struct connman_service *service;
 252         struct connman_ipconfig *ipconfig;
 253         unsigned char prefixlen;
 254
 255         DBG("IPV4LL available");
 256
 257         service = __connman_service_lookup_from_network(dhcp->network);
 258         if (service == NULL)
 259                 return;
 260
 261         ipconfig = __connman_service_get_ip4config(service);
 262         if (ipconfig == NULL)
 263                 return;
 264
 265         address = g_dhcp_client_get_address(dhcp_client);
 266         netmask = g_dhcp_client_get_netmask(dhcp_client);
 267
 268         prefixlen = __connman_ipconfig_netmask_prefix_len(netmask);
 269
 270         connman_ipconfig_set_method(ipconfig, CONNMAN_IPCONFIG_METHOD_DHCP);
 271         __connman_ipconfig_set_local(ipconfig, address);
 272         __connman_ipconfig_set_prefixlen(ipconfig, prefixlen);
 273         __connman_ipconfig_set_gateway(ipconfig, NULL);
 274
 275         dhcp_valid(dhcp);
 276
 277         g_free(address);
 278         g_free(netmask);
 279 }
 280
 281 static void dhcp_debug(const char *str, void *data)
 282 {
 283         connman_info("%s: %s\n", (const char *) data, str);
 284 }
 285
 286 static int dhcp_request(struct connman_dhcp *dhcp)
 287 {
 288         GDHCPClient *dhcp_client;
 289         GDHCPClientError error;
 290         const char *hostname;
 291         int index;
 292
 293         DBG("dhcp %p", dhcp);
 294
 295         index = connman_network_get_index(dhcp->network);
 296
 297         dhcp_client = g_dhcp_client_new(G_DHCP_IPV4, index, &error);
 298         if (error != G_DHCP_CLIENT_ERROR_NONE)
 299                 return -EINVAL;
 300
 301         if (getenv("CONNMAN_DHCP_DEBUG"))
 302                 g_dhcp_client_set_debug(dhcp_client, dhcp_debug, "DHCP");
 303
 304         hostname = connman_utsname_get_hostname();
 305         if (hostname != NULL)
 306                 g_dhcp_client_set_send(dhcp_client, G_DHCP_HOST_NAME, hostname);
 307
 308         g_dhcp_client_set_request(dhcp_client, G_DHCP_HOST_NAME);
 309         g_dhcp_client_set_request(dhcp_client, G_DHCP_SUBNET);
 310         g_dhcp_client_set_request(dhcp_client, G_DHCP_DNS_SERVER);
 311         g_dhcp_client_set_request(dhcp_client, G_DHCP_DOMAIN_NAME);
 312         g_dhcp_client_set_request(dhcp_client, G_DHCP_NTP_SERVER);
 313         g_dhcp_client_set_request(dhcp_client, G_DHCP_ROUTER);
 314         g_dhcp_client_set_request(dhcp_client, 252);
 315
 316         g_dhcp_client_register_event(dhcp_client,
 317                         G_DHCP_CLIENT_EVENT_LEASE_AVAILABLE,
 318                                                 lease_available_cb, dhcp);
 319
 320         g_dhcp_client_register_event(dhcp_client,
 321                         G_DHCP_CLIENT_EVENT_IPV4LL_AVAILABLE,
 322                                                 ipv4ll_available_cb, dhcp);
 323
 324         g_dhcp_client_register_event(dhcp_client,
 325                         G_DHCP_CLIENT_EVENT_LEASE_LOST, lease_lost_cb, dhcp);
 326
 327         g_dhcp_client_register_event(dhcp_client,
 328                         G_DHCP_CLIENT_EVENT_IPV4LL_LOST, ipv4ll_lost_cb, dhcp);
 329
 330         g_dhcp_client_register_event(dhcp_client,
 331                         G_DHCP_CLIENT_EVENT_NO_LEASE, no_lease_cb, dhcp);
 332
 333         dhcp->dhcp_client = dhcp_client;
 334
 335         return g_dhcp_client_start(dhcp_client);
 336 }
 337
 338 static int dhcp_release(struct connman_dhcp *dhcp)
 339 {
 340         DBG("dhcp %p", dhcp);
 341
 342         if (dhcp->dhcp_client == NULL)
 343                 return 0;
 344
 345         g_dhcp_client_stop(dhcp->dhcp_client);
 346         g_dhcp_client_unref(dhcp->dhcp_client);
 347
 348         dhcp->dhcp_client = NULL;
 349
 350         return 0;
 351 }
 352
 353 static void remove_network(gpointer user_data)
 354 {
 355         struct connman_dhcp *dhcp = user_data;
 356
 357         DBG("dhcp %p", dhcp);
 358
 359         dhcp_release(dhcp);
 360
 361         dhcp_free(dhcp);
 362         g_free(dhcp);
 363 }
 364
 365 int __connman_dhcp_start(struct connman_network *network, dhcp_cb callback)
 366 {
 367         struct connman_dhcp *dhcp;
 368
 369         DBG("");
 370
 371         dhcp = g_try_new0(struct connman_dhcp, 1);
 372         if (dhcp == NULL)
 373                 return -ENOMEM;
 374
 375         dhcp->network = network;
 376         dhcp->callback = callback;
 377
 378         g_hash_table_replace(network_table, network, dhcp);
 379
 380         return dhcp_request(dhcp);
 381 }
 382
 383 void __connman_dhcp_stop(struct connman_network *network)
 384 {
 385         struct connman_dhcp *dhcp;
 386
 387         DBG("");
 388
 389         dhcp = g_hash_table_lookup(network_table, network);
 390         if (dhcp == NULL)
 391                 return;
 392
 393         dhcp_release(dhcp);
 394
 395         g_hash_table_remove(network_table, network);
 396 }
 397
 398 int __connman_dhcp_init(void)
 399 {
 400         DBG("");
 401
 402         network_table = g_hash_table_new_full(g_direct_hash, g_direct_equal,
 403                                                         NULL, remove_network);
 404
 405         return 0;
 406 }
 407
 408 void __connman_dhcp_cleanup(void)
 409 {
 410         DBG("");
 411
 412         g_hash_table_destroy(network_table);
 413 }