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         connman_uint8_t strength = 0;
 209         const char *type = NULL, *method = NULL;
 210         const char *address = NULL, *netmask = NULL, *gateway = NULL;
 211
 212         DBG("conn %p", conn);
 213
 214         reply = dbus_message_new_method_return(msg);
 215         if (reply == NULL)
 216                 return NULL;
 217
 218         dbus_message_iter_init_append(reply, &array);
 219
 220         dbus_message_iter_open_container(&array, DBUS_TYPE_ARRAY,
 221                         DBUS_DICT_ENTRY_BEGIN_CHAR_AS_STRING
 222                         DBUS_TYPE_STRING_AS_STRING DBUS_TYPE_VARIANT_AS_STRING
 223                         DBUS_DICT_ENTRY_END_CHAR_AS_STRING, &dict);
 224
 225         connman_element_get_static_property(element, "Type", &type);
 226
 227         if (type != NULL)
 228                 connman_dbus_dict_append_variant(&dict, "Type",
 229                                                 DBUS_TYPE_STRING, &type);
 230
 231         connman_element_get_static_property(element, "Strength", &strength);
 232         if (strength > 0)
 233                 connman_dbus_dict_append_variant(&dict, "Strength",
 234                                                 DBUS_TYPE_BYTE, &strength);
 235
 236         if (element->devname != NULL)
 237                 connman_dbus_dict_append_variant(&dict, "Interface",
 238                                         DBUS_TYPE_STRING, &element->devname);
 239
 240         connman_dbus_dict_append_variant(&dict, "Default",
 241                                         DBUS_TYPE_BOOLEAN, &element->enabled);
 242
 243         connman_element_get_value(element,
 244                                 CONNMAN_PROPERTY_ID_IPV4_METHOD, &method);
 245
 246         connman_element_get_value(element,
 247                                 CONNMAN_PROPERTY_ID_IPV4_ADDRESS, &address);
 248         connman_element_get_value(element,
 249                                 CONNMAN_PROPERTY_ID_IPV4_NETMASK, &netmask);
 250         connman_element_get_value(element,
 251                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 252
 253         if (method != NULL)
 254                 connman_dbus_dict_append_variant(&dict, "IPv4.Method",
 255                                                 DBUS_TYPE_STRING, &method);
 256
 257         if (address != NULL)
 258                 connman_dbus_dict_append_variant(&dict, "IPv4.Address",
 259                                                 DBUS_TYPE_STRING, &address);
 260
 261         if (netmask != NULL)
 262                 connman_dbus_dict_append_variant(&dict, "IPv4.Netmask",
 263                                                 DBUS_TYPE_STRING, &netmask);
 264
 265         if (gateway != NULL)
 266                 connman_dbus_dict_append_variant(&dict, "IPv4.Gateway",
 267                                                 DBUS_TYPE_STRING, &gateway);
 268
 269         dbus_message_iter_close_container(&array, &dict);
 270
 271         return reply;
 272 }
 273
 274 static DBusMessage *set_property(DBusConnection *conn,
 275                                         DBusMessage *msg, void *data)
 276 {
 277         DBusMessageIter iter, value;
 278         const char *name;
 279
 280         DBG("conn %p", conn);
 281
 282         if (dbus_message_iter_init(msg, &iter) == FALSE)
 283                 return __connman_error_invalid_arguments(msg);
 284
 285         dbus_message_iter_get_basic(&iter, &name);
 286         dbus_message_iter_next(&iter);
 287         dbus_message_iter_recurse(&iter, &value);
 288
 289         if (__connman_security_check_privileges(msg) < 0)
 290                 return __connman_error_permission_denied(msg);
 291
 292         return g_dbus_create_reply(msg, DBUS_TYPE_INVALID);
 293 }
 294
 295 static GDBusMethodTable connection_methods[] = {
 296         { "GetProperties", "",   "a{sv}", get_properties },
 297         { "SetProperty",   "sv", "",      set_property   },
 298         { },
 299 };
 300
 301 static GDBusSignalTable connection_signals[] = {
 302         { "PropertyChanged", "sv" },
 303         { },
 304 };
 305
 306 static DBusConnection *connection;
 307
 308 static void emit_connections_signal(void)
 309 {
 310 }
 311
 312 static int register_interface(struct connman_element *element)
 313 {
 314         DBG("element %p name %s", element, element->name);
 315
 316         if (g_dbus_register_interface(connection, element->path,
 317                                         CONNMAN_CONNECTION_INTERFACE,
 318                                         connection_methods, connection_signals,
 319                                         NULL, element, NULL) == FALSE) {
 320                 connman_error("Failed to register %s connection", element->path);
 321                 return -EIO;
 322         }
 323
 324         emit_connections_signal();
 325
 326         return 0;
 327 }
 328
 329 static void unregister_interface(struct connman_element *element)
 330 {
 331         DBG("element %p name %s", element, element->name);
 332
 333         emit_connections_signal();
 334
 335         g_dbus_unregister_interface(connection, element->path,
 336                                                 CONNMAN_CONNECTION_INTERFACE);
 337 }
 338
 339 static int connection_probe(struct connman_element *element)
 340 {
 341         const char *gateway = NULL;
 342
 343         DBG("element %p name %s", element, element->name);
 344
 345         if (element->parent == NULL)
 346                 return -ENODEV;
 347
 348         if (element->parent->type != CONNMAN_ELEMENT_TYPE_IPV4)
 349                 return -ENODEV;
 350
 351         connman_element_get_value(element,
 352                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 353
 354         DBG("gateway %s", gateway);
 355
 356         if (register_interface(element) < 0)
 357                 return -ENODEV;
 358
 359         if (gateway == NULL)
 360                 return 0;
 361
 362         if (g_slist_length(gateway_list) > 0) {
 363                 DBG("default gateway already present");
 364                 return 0;
 365         }
 366
 367         set_route(element, gateway);
 368
 369         connman_element_set_enabled(element, TRUE);
 370
 371         return 0;
 372 }
 373
 374 static void connection_remove(struct connman_element *element)
 375 {
 376         const char *gateway = NULL;
 377
 378         DBG("element %p name %s", element, element->name);
 379
 380         unregister_interface(element);
 381
 382         connman_element_get_value(element,
 383                                 CONNMAN_PROPERTY_ID_IPV4_GATEWAY, &gateway);
 384
 385         DBG("gateway %s", gateway);
 386
 387         if (gateway == NULL)
 388                 return;
 389
 390         del_route(element, gateway);
 391 }
 392
 393 static struct connman_driver connection_driver = {
 394         .name           = "connection",
 395         .type           = CONNMAN_ELEMENT_TYPE_CONNECTION,
 396         .priority       = CONNMAN_DRIVER_PRIORITY_LOW,
 397         .probe          = connection_probe,
 398         .remove         = connection_remove,
 399 };
 400
 401 int __connman_connection_init(void)
 402 {
 403         DBG("");
 404
 405         connection = connman_dbus_get_connection();
 406
 407         if (connman_rtnl_register(&connection_rtnl) < 0)
 408                 connman_error("Failed to setup RTNL gateway driver");
 409
 410         connman_rtnl_send_getroute();
 411
 412         return connman_driver_register(&connection_driver);
 413 }
 414
 415 void __connman_connection_cleanup(void)
 416 {
 417         GSList *list;
 418
 419         DBG("");
 420
 421         connman_driver_unregister(&connection_driver);
 422
 423         connman_rtnl_unregister(&connection_rtnl);
 424
 425         for (list = gateway_list; list; list = list->next) {
 426                 struct gateway_data *data = list->data;
 427
 428                 DBG("index %d gateway %s", data->index, data->gateway);
 429
 430                 g_free(data->gateway);
 431                 g_free(data);
 432                 list->data = NULL;
 433         }
 434
 435         g_slist_free(gateway_list);
 436         gateway_list = NULL;
 437
 438         dbus_connection_unref(connection);
 439 }