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