src/connection.c

   1 /*
   2  *
   3  *  Connection Manager
   4  *
   5  *  Copyright (C) 2007-2009  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
  26 #include <errno.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <sys/ioctl.h>
  30 #include <arpa/inet.h>
  31 #include <net/if.h>
  32 #include <net/route.h>
  33
  34 #include <gdbus.h>
  35
  36 #include "connman.h"
  37
  38 struct gateway_data {
  39         int index;
  40         char *gateway;
  41 };
  42
  43 static GSList *gateway_list = NULL;
  44
  45 static struct gateway_data *find_gateway(int index, const char *gateway)
  46 {
  47         GSList *list;
  48
  49         if (gateway == NULL)
  50                 return NULL;
  51
  52         for (list = gateway_list; list; list = list->next) {
  53                 struct gateway_data *data = list->data;
  54
  55                 if (data->gateway == NULL)
  56                         continue;
  57
  58                 if (data->index == index &&
  59                                 g_str_equal(data->gateway, gateway) == TRUE)
  60                         return data;
  61         }
  62
  63         return NULL;
  64 }
  65
  66 static void connection_newgateway(int index, const char *gateway)
  67 {
  68         struct gateway_data *data;
  69
  70         DBG("index %d gateway %s", index, gateway);
  71
  72         data = find_gateway(index, gateway);
  73         if (data != NULL)
  74                 return;
  75
  76         data = g_try_new0(struct gateway_data, 1);
  77         if (data == NULL)
  78                 return;
  79
  80         data->index = index;
  81         data->gateway = g_strdup(gateway);
  82
  83         gateway_list = g_slist_append(gateway_list, data);
  84 }
  85
  86 static void connection_delgateway(int index, const char *gateway)
  87 {
  88         struct gateway_data *data;
  89
  90         DBG("index %d gateway %s", index, gateway);
  91
  92         data = find_gateway(index, gateway);
  93         if (data == NULL)
  94                 return;
  95
  96         gateway_list = g_slist_remove(gateway_list, data);
  97
  98         g_free(data->gateway);
  99         g_free(data);
 100 }
 101
 102 static struct connman_rtnl connection_rtnl = {
 103         .name           = "connection",
 104         .newgateway     = connection_newgateway,
 105         .delgateway     = connection_delgateway,
 106 };
 107
 108 static int set_route(struct connman_element *element, const char *gateway)
 109 {
 110         struct ifreq ifr;
 111         struct rtentry rt;
 112         struct sockaddr_in *addr;
 113         int sk, err;
 114
 115         DBG("element %p", element);
 116
 117         sk = socket(PF_INET, SOCK_DGRAM, 0);
 118         if (sk < 0)
 119                 return -1;
 120
 121         memset(&ifr, 0, sizeof(ifr));
 122         ifr.ifr_ifindex = element->index;
 123
 124         if (ioctl(sk, SIOCGIFNAME, &ifr) < 0) {
 125                 close(sk);
 126                 return -1;
 127         }
 128
 129         DBG("ifname %s", ifr.ifr_name);
 130
 131         memset(&rt, 0, sizeof(rt));
 132         rt.rt_flags = RTF_UP | RTF_GATEWAY;
 133
 134         addr = (struct sockaddr_in *) &rt.rt_dst;
 135         addr->sin_family = AF_INET;
 136         addr->sin_addr.s_addr = INADDR_ANY;
 137
 138         addr = (struct sockaddr_in *) &rt.rt_gateway;
 139         addr->sin_family = AF_INET;
 140         addr->sin_addr.s_addr = inet_addr(gateway);
 141
 142         addr = (struct sockaddr_in *) &rt.rt_genmask;
 143         addr->sin_family = AF_INET;
 144         addr->sin_addr.s_addr = INADDR_ANY;
 145
 146         err = ioctl(sk, SIOCADDRT, &rt);
 147         if (err < 0)
 148                 DBG("default route setting failed (%s)", strerror(errno));
 149
 150         close(sk);
 151
 152         return err;
 153 }
 154
 155 static int del_route(struct connman_element *element, const char *gateway)
 156 {
 157         struct ifreq ifr;
 158         struct rtentry rt;
 159         struct sockaddr_in *addr;
 160         int sk, err;
 161
 162         DBG("element %p", element);
 163
 164         sk = socket(PF_INET, SOCK_DGRAM, 0);
 165         if (sk < 0)
 166                 return -1;
 167
 168         memset(&ifr, 0, sizeof(ifr));
 169         ifr.ifr_ifindex = element->index;
 170
 171         if (ioctl(sk, SIOCGIFNAME, &ifr) < 0) {
 172                 close(sk);
 173                 return -1;
 174         }
 175
 176         DBG("ifname %s", ifr.ifr_name);
 177
 178         memset(&rt, 0, sizeof(rt));
 179         rt.rt_flags = RTF_UP | RTF_GATEWAY;
 180
 181         addr = (struct sockaddr_in *) &rt.rt_dst;
 182         addr->sin_family = AF_INET;
 183         addr->sin_addr.s_addr = INADDR_ANY;
 184
 185         addr = (struct sockaddr_in *) &rt.rt_gateway;
 186         addr->sin_family = AF_INET;
 187         addr->sin_addr.s_addr = inet_addr(gateway);
 188
 189         addr = (struct sockaddr_in *) &rt.rt_genmask;
 190         addr->sin_family = AF_INET;
 191         addr->sin_addr.s_addr = INADDR_ANY;
 192
 193         err = ioctl(sk, SIOCDELRT, &rt);
 194         if (err < 0)
 195                 DBG("default route removal failed (%s)", strerror(errno));
 196
 197         close(sk);
 198
 199         return err;
 200 }
 201
 202 static DBusMessage *get_properties(DBusConnection *conn,
 203                                         DBusMessage *msg, void *data)
 204 {
 205         struct connman_element *element = data;
 206         DBusMessage *reply;
 207         DBusMessageIter array, dict;
 208
 209         DBG("conn %p", conn);
 210
 211         reply = dbus_message_new_method_return(msg);
 212         if (reply == NULL)
 213                 return NULL;
 214
 215         dbus_message_iter_init_append(reply, &array);
 216
 217         dbus_message_iter_open_container(&array, DBUS_TYPE_ARRAY,
 218                         DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
 219                         DBUS_TYPE_STRING_AS_STRING DBUS_TYPE_VARIANT_AS_STRING
 220                         DBUS_DICT_ENTRY_END_CHAR_AS_STRING, &dict);
 221
 222         if (element->devname != NULL)
 223                 connman_dbus_dict_append_variant(&dict, "Interface",
 224                                         DBUS_TYPE_STRING, &element->devname);
 225
 226         dbus_message_iter_close_container(&array, &dict);
 227
 228         return reply;
 229 }
 230
 231 static DBusMessage *set_property(DBusConnection *conn,
 232                                         DBusMessage *msg, void *data)
 233 {
 234         DBusMessageIter iter, value;
 235         const char *name;
 236
 237         DBG("conn %p", conn);
 238
 239         if (dbus_message_iter_init(msg, &iter) == FALSE)
 240                 return __connman_error_invalid_arguments(msg);
 241
 242         dbus_message_iter_get_basic(&iter, &name);
 243         dbus_message_iter_next(&iter);
 244         dbus_message_iter_recurse(&iter, &value);
 245
 246         if (__connman_security_check_privileges(msg) < 0)
 247                 return __connman_error_permission_denied(msg);
 248
 249         return g_dbus_create_reply(msg, DBUS_TYPE_INVALID);
 250 }
 251
 252 static GDBusMethodTable connection_methods[] = {
 253         { "GetProperties", "",   "a{sv}", get_properties },
 254         { "SetProperty",   "sv", "",      set_property   },
 255         { },
 256 };
 257
 258 static GDBusSignalTable connection_signals[] = {
 259         { "PropertyChanged", "sv" },
 260         { },
 261 };
 262
 263 static DBusConnection *connection;
 264
 265 static void emit_connections_signal(void)
 266 {
 267 }
 268
 269 static int register_interface(struct connman_element *element)
 270 {
 271         DBG("element %p name %s", element, element->name);
 272
 273         if (g_dbus_register_interface(connection, element->path,
 274                                         CONNMAN_CONNECTION_INTERFACE,
 275                                         connection_methods, connection_signals,
 276                                         NULL, element, NULL) == FALSE) {
 277                 connman_error("Failed to register %s connection", element->path);
 278                 return -EIO;
 279         }
 280
 281         emit_connections_signal();
 282
 283         return 0;
 284 }
 285
 286 static void unregister_interface(struct connman_element *element)
 287 {
 288         DBG("element %p name %s", element, element->name);
 289
 290         emit_connections_signal();
 291
 292         g_dbus_unregister_interface(connection, element->path,
 293                                                 CONNMAN_CONNECTION_INTERFACE);
 294 }
 295
 296 static int connection_probe(struct connman_element *element)
 297 {
 298         const char *gateway = NULL;
 299
 300         DBG("element %p name %s", element, element->name);
 301
 302         if (element->parent == NULL)
 303                 return -ENODEV;
 304
 305         if (element->parent->type != CONNMAN_ELEMENT_TYPE_IPV4)
 306                 return -ENODEV;
 307
 308         connman_element_get_value(element,
 309                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 310
 311         DBG("gateway %s", gateway);
 312
 313         if (register_interface(element) < 0)
 314                 return -ENODEV;
 315
 316         if (gateway == NULL)
 317                 return 0;
 318
 319         if (g_slist_length(gateway_list) > 0) {
 320                 DBG("default gateway already present");
 321                 return 0;
 322         }
 323
 324         set_route(element, gateway);
 325
 326         connman_element_set_enabled(element, TRUE);
 327
 328         return 0;
 329 }
 330
 331 static void connection_remove(struct connman_element *element)
 332 {
 333         const char *gateway = NULL;
 334
 335         DBG("element %p name %s", element, element->name);
 336
 337         unregister_interface(element);
 338
 339         connman_element_get_value(element,
 340                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 341
 342         DBG("gateway %s", gateway);
 343
 344         if (gateway == NULL)
 345                 return;
 346
 347         del_route(element, gateway);
 348 }
 349
 350 static struct connman_driver connection_driver = {
 351         .name           = "connection",
 352         .type           = CONNMAN_ELEMENT_TYPE_CONNECTION,
 353         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 354         .probe          = connection_probe,
 355         .remove         = connection_remove,
 356 };
 357
 358 int __connman_connection_init(void)
 359 {
 360         DBG("");
 361
 362         connection = connman_dbus_get_connection();
 363
 364         if (connman_rtnl_register(&connection_rtnl) < 0)
 365                 connman_error("Failed to setup RTNL gateway driver");
 366
 367         connman_rtnl_send_getroute();
 368
 369         return connman_driver_register(&connection_driver);
 370 }
 371
 372 void __connman_connection_cleanup(void)
 373 {
 374         GSList *list;
 375
 376         DBG("");
 377
 378         connman_driver_unregister(&connection_driver);
 379
 380         connman_rtnl_unregister(&connection_rtnl);
 381
 382         for (list = gateway_list; list; list = list->next) {
 383                 struct gateway_data *data = list->data;
 384
 385                 DBG("index %d gateway %s", data->index, data->gateway);
 386
 387                 g_free(data->gateway);
 388                 g_free(data);
 389                 list->data = NULL;
 390         }
 391
 392         g_slist_free(gateway_list);
 393         gateway_list = NULL;
 394
 395         dbus_connection_unref(connection);
 396 }